Zone Forecast Product
Issued by NWS Boise, ID
Issued by NWS Boise, ID
227
FPUS55 KBOI 202031
ZFPBOI
Zone Forecasts for Southwest Idaho/Southeast Oregon
National Weather Service Boise ID
230 PM MDT Thu Aug 20 2026
Spot temperatures are for tonight, Friday, Friday night, and
Saturday.
IDZ011-210400-
West Central Mountains-
230 PM MDT Thu Aug 20 2026
.TONIGHT...Mostly cloudy. Lows 53 to 65.
.FRIDAY...Mostly sunny. Highs 87 to 101.
.FRIDAY NIGHT...Mostly cloudy. Lows 57 to 68.
.SATURDAY...Decreasing clouds. A chance of showers. A slight
chance of thunderstorms. Thunderstorms may produce gusty winds in
the afternoon. Chance of rain 30 percent. Highs 79 to 92.
.SATURDAY NIGHT...Partly cloudy. Lows 48 to 59.
.SUNDAY AND SUNDAY NIGHT...Mostly clear. Highs 73 to 86. Lows
47 to 57.
.MONDAY...Partly cloudy. A slight chance of rain showers and
thunderstorms in the afternoon. Chance of rain 20 percent. Highs
76 to 90.
.MONDAY NIGHT...Partly cloudy. Lows 50 to 60.
.TUESDAY...Partly cloudy. A slight chance of showers and
thunderstorms in the afternoon. Chance of rain 20 percent. Highs
77 to 90.
.TUESDAY NIGHT THROUGH WEDNESDAY NIGHT...Partly cloudy. Lows
49 to 60. Highs 76 to 89.
.THURSDAY...Partly cloudy. A slight chance of rain showers in the
afternoon. Chance of rain 20 percent. Highs 74 to 88.
&&
TEMPERATURE
McCall 52 95 57 87
$$
=
IDZ013-210400-
Boise Mountains-
230 PM MDT Thu Aug 20 2026
.TONIGHT...Decreasing clouds. Patchy smoke. Lows 52 to 66.
.FRIDAY...Mostly sunny. Patchy smoke. Highs 88 to 102.
.FRIDAY NIGHT...Increasing clouds. A slight chance of showers and
thunderstorms in the evening. Thunderstorms may produce gusty
winds in the evening. Chance of rain 20 percent. Lows 55 to 70.
.SATURDAY...Partly cloudy with a chance of showers. A slight
chance of thunderstorms. Thunderstorms may produce gusty winds in
the afternoon. Chance of rain 30 percent. Highs 80 to 95.
.SATURDAY NIGHT...Partly cloudy with a slight chance of showers
and thunderstorms. Chance of rain 20 percent. Lows 47 to 62.
.SUNDAY AND SUNDAY NIGHT...Mostly clear. Highs 75 to 90. Lows
44 to 59.
.MONDAY THROUGH TUESDAY...Partly cloudy with a slight chance of
rain showers and thunderstorms. Chance of rain 20 percent. Highs
78 to 93. Lows 45 to 60.
.TUESDAY NIGHT...Partly cloudy. A slight chance of rain showers
in the evening. Chance of rain 20 percent. Lows 45 to 60.
.WEDNESDAY AND WEDNESDAY NIGHT...Partly cloudy. Highs 78 to 93.
Lows 45 to 60.
.THURSDAY...Partly cloudy. A slight chance of rain showers in the
afternoon. Chance of rain 20 percent. Highs 77 to 91.
&&
TEMPERATURE
Idaho City 52 101 57 94
$$
=
IDZ028-210400-
Camas Prairie-
230 PM MDT Thu Aug 20 2026
.TONIGHT...Decreasing clouds. Patchy smoke after midnight. Lows
49 to 56. West winds 10 to 15 mph. Gusts to 25 mph this evening.
.FRIDAY...Patchy smoke in the morning. Mostly sunny. Highs 95 to
100. North winds around 10 mph in the morning, shifting to
southeast in the afternoon. Gusts to 20 mph.
.FRIDAY NIGHT...Mostly cloudy. Lows 57 to 62. Breezy. South winds
10 to 20 mph with gusts to 30 mph.
.SATURDAY...Partly cloudy. A chance of showers with a slight
chance of thunderstorms in the afternoon. Thunderstorms may
produce gusty winds in the afternoon. Chance of rain 30 percent.
Highs 87 to 92. Southeast winds 10 to 15 mph.
.SATURDAY NIGHT...Mostly cloudy with a chance of showers with a
slight chance of thunderstorms. Chance of rain 30 percent. Lows
50 to 55. Southwest winds 10 to 15 mph. Gusts to 25 mph in the
evening.
.SUNDAY AND SUNDAY NIGHT...Partly cloudy. Highs 83 to 88. Lows
49 to 54.
.MONDAY AND MONDAY NIGHT...Partly cloudy. A slight chance of
showers and thunderstorms. Chance of rain 20 percent. Highs 82 to
87. Lows 48 to 53.
.TUESDAY...Mostly sunny. Highs 84 to 89.
.TUESDAY NIGHT...Mostly cloudy with a slight chance of showers in
the evening, then partly cloudy after midnight. Chance of rain
20 percent. Lows 49 to 55.
.WEDNESDAY THROUGH THURSDAY...Partly cloudy. Highs 83 to 89. Lows
48 to 54.
&&
TEMPERATURE
Fairfield 49 97 57 90
$$
=
IDZ033-210400-
Upper Weiser River-
230 PM MDT Thu Aug 20 2026
...HEAT ADVISORY IN EFFECT UNTIL 9 PM MDT FRIDAY...
.TONIGHT...Mostly cloudy. Lows 64 to 70. South winds up to 10 mph
this evening, shifting to northeast after midnight. Gusts to
25 mph.
.FRIDAY...Mostly sunny. Highs 97 to 104. Northeast winds 10 to
15 mph in the morning, shifting to south in the afternoon.
.FRIDAY NIGHT...Mostly cloudy. Lows 68 to 73. Southwest winds
10 to 15 mph with gusts to 25 mph.
.SATURDAY...Decreasing clouds. Highs 91 to 97. South winds 10 to
15 mph with gusts to 30 mph.
.SATURDAY NIGHT...Partly cloudy. Lows 60 to 66. Southwest winds
10 to 15 mph in the evening, shifting to northwest after
midnight. Gusts to 25 mph.
.SUNDAY AND SUNDAY NIGHT...Mostly clear. Highs 85 to 91. Lows
57 to 62.
.MONDAY AND MONDAY NIGHT...Partly cloudy. Highs 87 to 93. Lows
60 to 65.
.TUESDAY...Sunny. Highs 88 to 94.
.TUESDAY NIGHT THROUGH THURSDAY...Partly cloudy. Lows 59 to 66.
Highs 86 to 93.
&&
TEMPERATURE
Council 66 104 70 97
Cambridge 64 102 68 96
$$
=
ORZ064-210400-
Oregon Lower Treasure Valley-
230 PM MDT Thu Aug 20 2026 /130 PM PDT Thu Aug 20 2026/
...HEAT ADVISORY IN EFFECT UNTIL 9 PM MDT /8 PM PDT/ FRIDAY...
.TONIGHT...Mostly cloudy. Patchy smoke after midnight. Lows 63 to
70. South winds up to 10 mph this evening, shifting to west after
midnight. Gusts to 20 mph.
.FRIDAY...Patchy smoke in the morning. Partly sunny. Highs 98 to
103. Northwest winds up to 10 mph in the morning, becoming light
in the afternoon.
.FRIDAY NIGHT...Mostly cloudy. Lows 68 to 73. Southwest winds
10 to 15 mph with gusts to 30 mph.
.SATURDAY...Decreasing clouds. Highs 94 to 99. Southwest winds
10 to 15 mph with gusts to 30 mph.
.SATURDAY NIGHT...Partly cloudy. Lows 62 to 67. Breezy. West
winds 10 to 20 mph with gusts to 30 mph.
.SUNDAY AND SUNDAY NIGHT...Mostly clear. Highs 89 to 94. Lows
59 to 65.
.MONDAY THROUGH THURSDAY...Partly cloudy. Highs 90 to 97. Lows
60 to 68.
&&
TEMPERATURE
Ontario 63 100 68 97
$$
=
IDZ012-210400-
Lower Treasure Valley-
230 PM MDT Thu Aug 20 2026
...HEAT ADVISORY IN EFFECT UNTIL 9 PM MDT FRIDAY...
.TONIGHT...Mostly cloudy. Lows 61 to 68. West winds up to 10 mph.
.FRIDAY...Mostly sunny. Highs 97 to 103. East winds up to 10 mph.
.FRIDAY NIGHT...Mostly cloudy. Lows 67 to 72. South winds 10 to
15 mph with gusts to 30 mph.
.SATURDAY...Decreasing clouds. Highs 94 to 99. Southeast winds
10 to 15 mph with gusts to 25 mph.
.SATURDAY NIGHT...Partly cloudy. Lows 61 to 66. West winds 10 to
15 mph.
.SUNDAY AND SUNDAY NIGHT...Mostly clear. Highs 88 to 93. Lows
58 to 63.
.MONDAY...Mostly sunny. Highs 89 to 94.
.MONDAY NIGHT...Partly cloudy. A slight chance of showers in the
evening. Chance of rain 20 percent. Lows 59 to 64.
.TUESDAY THROUGH THURSDAY...Partly cloudy. Highs 89 to 96. Lows
59 to 65.
&&
TEMPERATURE
Caldwell 61 100 68 96
$$
=
IDZ014-210400-
Upper Treasure Valley-
230 PM MDT Thu Aug 20 2026
...HEAT ADVISORY IN EFFECT UNTIL 9 PM MDT FRIDAY...
.TONIGHT...Decreasing clouds. Patchy smoke after midnight. Lows
61 to 68. Northwest winds 10 to 15 mph. Gusts to 25 mph this
evening.
.FRIDAY...Patchy smoke in the morning. Mostly sunny. Highs 99 to
104. Southeast winds 10 to 15 mph. Gusts to 25 mph in the
afternoon.
.FRIDAY NIGHT...Mostly cloudy. Lows 67 to 73. Windy. South winds
15 to 25 mph with gusts to 40 mph in the evening, becoming
southeast 10 to 15 mph with gusts to 30 mph after midnight.
.SATURDAY...Mostly cloudy in the morning, then partly cloudy with
a slight chance of showers and thunderstorms in the afternoon.
Thunderstorms may produce gusty winds in the afternoon. Chance of
rain 20 percent. Highs 95 to 100. Southeast winds 10 to 15 mph in
the morning, shifting to southwest in the afternoon.
.SATURDAY NIGHT...Mostly cloudy with a slight chance of showers
and thunderstorms in the evening, then partly cloudy after
midnight. Thunderstorms may produce gusty winds in the evening.
Chance of rain 20 percent. Lows 60 to 65. West winds 10 to
15 mph.
.SUNDAY...Sunny. Highs 89 to 94.
.SUNDAY NIGHT...Increasing clouds. Lows 57 to 63.
.MONDAY...Partly cloudy. A chance of showers, mainly in the
afternoon. Chance of rain 30 percent. Highs 89 to 94.
.MONDAY NIGHT...Partly cloudy. A slight chance of showers in the
evening. Chance of rain 20 percent. Lows 58 to 64.
.TUESDAY THROUGH THURSDAY...Partly cloudy. Highs 90 to 97. Lows
58 to 65.
&&
TEMPERATURE
Boise 68 100 73 96
Mountain Home 63 104 69 98
$$
=
IDZ016-210400-
Western Magic Valley-
230 PM MDT Thu Aug 20 2026
...HEAT ADVISORY IN EFFECT UNTIL 9 PM MDT FRIDAY...
.TONIGHT...Decreasing clouds. Patchy smoke after midnight. Lows
61 to 66. South winds 10 to 15 mph. Gusts to 25 mph this evening.
.FRIDAY...Patchy smoke in the morning. Mostly sunny. Highs 96 to
102. East winds 10 to 15 mph.
.FRIDAY NIGHT...Mostly cloudy. Lows 66 to 71. Breezy. Southeast
winds 10 to 20 mph with gusts to 35 mph.
.SATURDAY...Partly cloudy with a chance of showers. A slight
chance of thunderstorms. Thunderstorms may produce gusty winds in
the afternoon. Chance of rain 30 percent. Highs 90 to 96.
Southeast winds 10 to 15 mph with gusts to 25 mph.
.SATURDAY NIGHT...Mostly cloudy with a chance of showers with a
slight chance of thunderstorms. Chance of rain 30 percent. Lows
62 to 67. South winds 10 to 15 mph with gusts to 25 mph.
.SUNDAY...Partly cloudy. A chance of showers with a slight chance
of thunderstorms in the afternoon. Chance of rain 30 percent.
Highs 86 to 91.
.SUNDAY NIGHT...Increasing clouds. Lows 58 to 63.
.MONDAY...Partly cloudy. A slight chance of showers in the
morning, then a chance of showers with a slight chance of
thunderstorms in the afternoon. Chance of rain 30 percent. Highs
85 to 90.
.MONDAY NIGHT...Mostly cloudy with a slight chance of showers and
thunderstorms in the evening, then partly cloudy after midnight.
Chance of rain 20 percent. Lows 57 to 62.
.TUESDAY...Mostly sunny. Highs 88 to 93.
.TUESDAY NIGHT...Decreasing clouds. Lows 59 to 64.
.WEDNESDAY THROUGH THURSDAY...Partly cloudy. Highs 86 to 93. Lows
58 to 63.
&&
TEMPERATURE
Jerome 65 96 68 90
Twin Falls 66 97 70 92
$$
=
IDZ029-210400-
Owyhee Mountains-
230 PM MDT Thu Aug 20 2026
.TONIGHT...Mostly cloudy. Lows 61 to 70.
.FRIDAY...Partly sunny. Highs 91 to 99.
.FRIDAY NIGHT...Mostly cloudy. Lows 62 to 72. Breezy.
.SATURDAY...Decreasing clouds. A slight chance of showers. A
slight chance of thunderstorms. Thunderstorms may produce gusty
winds in the afternoon. Chance of rain 20 percent. Highs 87 to
92. Breezy.
.SATURDAY NIGHT...Partly cloudy. Lows 55 to 65.
.SUNDAY...Sunny. Highs 81 to 88.
.SUNDAY NIGHT...Increasing clouds. Lows 55 to 62.
.MONDAY...Partly cloudy. A slight chance of showers in the
morning, then a chance of showers with a slight chance of
thunderstorms in the afternoon. Chance of rain 30 percent. Highs
82 to 89.
.MONDAY NIGHT AND TUESDAY...Partly cloudy. A 20 percent chance of
showers. Lows 56 to 64. Highs 84 to 91.
.TUESDAY NIGHT THROUGH THURSDAY...Partly cloudy. Lows 55 to 65.
Highs 82 to 90.
$$
=
IDZ015-210400-
Southwest Highlands-
230 PM MDT Thu Aug 20 2026
.TONIGHT...Partly cloudy. Lows 60 to 66.
.FRIDAY...Partly cloudy. A slight chance of showers and
thunderstorms in the afternoon. Thunderstorms may produce gusty
winds in the afternoon. Chance of rain 20 percent. Highs 95 to
100. Breezy.
.FRIDAY NIGHT...Mostly cloudy. A slight chance of showers and
thunderstorms in the evening. Thunderstorms may produce gusty
winds in the evening. Chance of rain 20 percent. Lows 63 to 69.
Windy. South winds around 25 mph with gusts to 40 mph in the
evening.
.SATURDAY...Mostly cloudy in the morning, then partly cloudy with
a chance of showers with a slight chance of thunderstorms in the
afternoon. Thunderstorms may produce gusty winds in the
afternoon. Chance of rain 30 percent. Highs 89 to 95.
.SATURDAY NIGHT...Mostly cloudy. A chance of showers with a
slight chance of thunderstorms in the evening. Thunderstorms may
produce gusty winds in the evening. Chance of rain 30 percent.
Lows 59 to 64. Breezy.
.SUNDAY...Partly cloudy. A slight chance of thunderstorms in the
afternoon. Highs 86 to 91.
.SUNDAY NIGHT...Partly cloudy. Lows 56 to 61.
.MONDAY...Decreasing clouds. A chance of showers. A chance of
thunderstorms in the afternoon. Chance of rain 40 percent. Highs
84 to 90.
.MONDAY NIGHT...Partly cloudy. A slight chance of showers and
thunderstorms in the evening. Chance of rain 20 percent. Lows
55 to 60.
.TUESDAY AND TUESDAY NIGHT...Partly cloudy. A 20 percent chance
of showers. Highs 87 to 92. Lows 56 to 62.
.WEDNESDAY AND WEDNESDAY NIGHT...Partly cloudy. Highs 87 to 92.
Lows 56 to 61.
.THURSDAY...Partly cloudy. A slight chance of showers in the
afternoon. Chance of rain 20 percent. Highs 86 to 91.
$$
=
IDZ030-210400-
Southern Twin Falls County-
230 PM MDT Thu Aug 20 2026
.TONIGHT...Decreasing clouds. Lows 61 to 67.
.FRIDAY...Partly cloudy. A slight chance of showers and
thunderstorms in the afternoon. Thunderstorms may produce gusty
winds in the afternoon. Chance of rain 20 percent. Highs 96 to
101.
.FRIDAY NIGHT...Mostly cloudy. A slight chance of showers and
thunderstorms in the evening. Thunderstorms may produce gusty
winds in the evening. Chance of rain 20 percent. Lows 67 to 72.
Windy. South winds around 25 mph in the evening. Gusts to 35 mph.
.SATURDAY...A chance of showers with a slight chance of
thunderstorms in the morning, then showers likely with a slight
chance of thunderstorms in the afternoon. Thunderstorms may
produce gusty winds in the afternoon. Chance of rain 60 percent.
Highs 90 to 95.
.SATURDAY NIGHT...A slight chance of thunderstorms. Showers
likely, mainly in the evening. Chance of rain 60 percent. Lows
63 to 68.
.SUNDAY...Showers likely with a chance of thunderstorms in the
afternoon. Chance of rain 60 percent. Highs 85 to 90.
.SUNDAY NIGHT...Partly cloudy with a slight chance of showers and
thunderstorms in the evening, then mostly cloudy after midnight.
Chance of rain 20 percent. Lows 59 to 64.
.MONDAY...Mostly cloudy with a slight chance of showers in the
morning, then showers likely with a chance of thunderstorms in
the afternoon. Chance of rain 60 percent. Highs 84 to 89.
.MONDAY NIGHT...Mostly cloudy with a slight chance of showers and
thunderstorms in the evening, then partly cloudy after midnight.
Chance of rain 20 percent. Lows 57 to 62.
.TUESDAY...Partly cloudy. A slight chance of showers and
thunderstorms in the afternoon. Chance of rain 20 percent. Highs
86 to 91.
.TUESDAY NIGHT...Mostly cloudy. A slight chance of showers in the
evening. Chance of rain 20 percent. Lows 60 to 65.
.WEDNESDAY AND WEDNESDAY NIGHT...Partly cloudy. Highs 86 to 91.
Lows 59 to 64.
.THURSDAY...Partly cloudy with a 20 percent chance of showers.
Highs 86 to 91.
$$
=
ORZ062-210400-
Baker County-
130 PM PDT Thu Aug 20 2026
.TONIGHT...Mostly cloudy. Patchy smoke after midnight. Lows 53 to
67. Northwest winds 10 to 15 mph with gusts to 25 mph.
.FRIDAY...Patchy smoke in the morning. Partly sunny. Highs 94 to
102. East winds up to 10 mph.
.FRIDAY NIGHT...Mostly cloudy. Patchy smoke after midnight. Lows
56 to 68. West winds 10 to 15 mph with gusts to 25 mph.
.SATURDAY...Mostly cloudy in the morning, then partly cloudy with
a slight chance of showers and thunderstorms in the afternoon.
Thunderstorms may produce gusty winds in the afternoon. Chance of
rain 20 percent. Highs 88 to 97. Breezy. South winds 10 to 20 mph
with gusts to 30 mph.
.SATURDAY NIGHT...Partly cloudy in the evening, then clearing.
Cooler with lows 45 to 58. Breezy. West winds 10 to 20 mph with
gusts to 35 mph.
.SUNDAY THROUGH MONDAY...Mostly clear. Highs 83 to 93. Lows 44 to
58.
.MONDAY NIGHT...Partly cloudy. Lows 48 to 61.
.TUESDAY...Sunny. Highs 86 to 94.
.TUESDAY NIGHT THROUGH WEDNESDAY NIGHT...Partly cloudy. Lows
47 to 61. Highs 85 to 93.
.THURSDAY...Sunny. Highs 83 to 91.
&&
TEMPERATURE
Baker City 53 99 56 94
$$
=
ORZ061-210400-
Harney County-
130 PM PDT Thu Aug 20 2026
.TONIGHT...Mostly cloudy. Lows 53 to 63. West winds up to 10 mph
with gusts to 20 mph.
.FRIDAY...Increasing clouds. Highs 85 to 95. Light winds in the
morning, becoming southwest 10 to 15 mph in the afternoon.
.FRIDAY NIGHT...Mostly cloudy. Lows 56 to 65. Breezy. West winds
10 to 20 mph with gusts to 30 mph.
.SATURDAY...Partly cloudy with a slight chance of showers and
thunderstorms in the morning, then sunny in the afternoon. Chance
of rain 20 percent. Highs 83 to 92. Breezy. Southwest winds 10 to
20 mph. Gusts to 35 mph in the afternoon.
.SATURDAY NIGHT...Mostly clear. Cooler with lows 44 to 54. Windy.
West winds 15 to 25 mph with gusts to 35 mph in the evening,
decreasing to 10 to 15 mph with gusts to 25 mph after midnight.
.SUNDAY AND SUNDAY NIGHT...Mostly clear. Highs 78 to 88. Lows
45 to 56.
.MONDAY AND MONDAY NIGHT...Partly cloudy. A 20 percent chance of
showers. Highs 80 to 90. Lows 47 to 57.
.TUESDAY THROUGH THURSDAY...Partly cloudy. Highs 80 to 90. Lows
47 to 57.
&&
TEMPERATURE
Burns 54 94 56 91
$$
=
ORZ063-210400-
Malheur County-
230 PM MDT Thu Aug 20 2026 /130 PM PDT Thu Aug 20 2026/
.TONIGHT...Mostly cloudy. Lows 58 to 68. Northwest winds 10 to
15 mph this evening, shifting to south after midnight.
.FRIDAY...Partly sunny. Highs 96 to 101. Southeast winds 10 to
15 mph. Gusts to 25 mph in the afternoon.
.FRIDAY NIGHT...Mostly cloudy. Lows 61 to 71. Southwest winds
10 to 15 mph with gusts to 35 mph.
.SATURDAY...Decreasing clouds. Highs 91 to 96. Breezy. Southwest
winds 10 to 20 mph with gusts to 30 mph.
.SATURDAY NIGHT...Partly cloudy. Lows 54 to 64. Breezy. West
winds 10 to 20 mph with gusts to 30 mph.
.SUNDAY...Sunny. Highs 86 to 91.
.SUNDAY NIGHT AND MONDAY...Partly cloudy. Lows 53 to 62. Highs
88 to 93.
.MONDAY NIGHT...Partly cloudy. A slight chance of showers in the
evening. Chance of rain 20 percent. Lows 53 to 63.
.TUESDAY THROUGH THURSDAY...Partly cloudy. Highs 87 to 94. Lows
53 to 63.
$$
=