Zone Forecast Product
Issued by NWS Boise, ID
Issued by NWS Boise, ID
346
FPUS55 KBOI 180831
ZFPBOI
Zone Forecasts for Southwest Idaho/Southeast Oregon
National Weather Service Boise ID
230 AM MDT Fri Sep 18 2026
Spot temperatures are for today, tonight, and Saturday.
IDZ011-181600-
West Central Mountains-
230 AM MDT Fri Sep 18 2026
.TODAY...Partly cloudy with a chance of rain showers this
morning, then rain showers likely with a chance of thunderstorms
this afternoon. Areas of fog this morning. Patchy smoke this
afternoon. Chance of rain 60 percent. Highs 60 to 73.
.TONIGHT...A chance of rain showers with a slight chance of
thunderstorms in the evening, then rain showers after midnight.
Areas of fog. Chance of rain 90 percent. Lows 40 to 50.
.SATURDAY...Areas of fog in the morning. Rain showers likely in
the morning, then partly cloudy with a slight chance of rain
showers in the afternoon. Chance of rain 70 percent. Highs 61 to
74.
.SATURDAY NIGHT...Decreasing clouds. Areas of fog after midnight.
Lows 40 to 49.
.SUNDAY...Areas of fog in the morning. Sunny. Highs 66 to 79.
.SUNDAY NIGHT AND MONDAY...Mostly clear. Areas of fog through the
day. Lows 42 to 52. Highs 66 to 80.
.MONDAY NIGHT...Partly cloudy. Lows 42 to 52.
.TUESDAY...Patchy fog in the morning. Sunny. Highs 66 to 79.
.TUESDAY NIGHT THROUGH THURSDAY...Mostly clear. Lows 41 to 52.
Highs 66 to 80.
&&
TEMPERATURE
McCall 67 40 68
$$
=
IDZ013-181600-
Boise Mountains-
230 AM MDT Fri Sep 18 2026
.TODAY...Mostly cloudy with a chance of rain showers. Areas of
fog this morning. Patchy smoke this afternoon. A chance of
thunderstorms this afternoon. Chance of rain 30 percent. Cooler
with highs 59 to 73.
.TONIGHT...A slight chance of thunderstorms in the evening.
Partly cloudy with a chance of rain showers. Areas of fog. Chance
of rain 30 percent. Lows 35 to 50.
.SATURDAY...Decreasing clouds. Areas of fog in the morning. Rain
showers. Chance of rain 80 percent. Highs 59 to 74.
.SATURDAY NIGHT...Partly cloudy in the evening, then clearing.
Patchy fog in the evening. Areas of fog after midnight. Lows
34 to 49.
.SUNDAY...Areas of fog in the morning. Sunny. Highs 66 to 81.
.SUNDAY NIGHT AND MONDAY...Mostly clear. Patchy fog through the
day. Lows 36 to 51. Highs 68 to 83.
.MONDAY NIGHT...Partly cloudy. Lows 38 to 53.
.TUESDAY...Partly cloudy. A slight chance of rain showers in the
afternoon. Chance of rain 20 percent. Highs 68 to 83.
.TUESDAY NIGHT THROUGH THURSDAY...Mostly clear. Lows 37 to 52.
Highs 70 to 85.
&&
TEMPERATURE
Idaho City 71 41 72
$$
=
IDZ028-181600-
Camas Prairie-
230 AM MDT Fri Sep 18 2026
.TODAY...Areas of fog this morning. Rain showers likely this
morning, then partly cloudy with a chance of rain showers with a
slight chance of thunderstorms this afternoon. Chance of rain
60 percent. Cooler with highs 64 to 69. West winds 10 to 15 mph.
.TONIGHT...Partly cloudy. A slight chance of rain showers and
thunderstorms in the evening, then a chance of rain showers after
midnight. Areas of fog after midnight. Chance of rain 30 percent.
Lows 36 to 42. Northwest winds 10 to 15 mph in the evening,
becoming light after midnight.
.SATURDAY...Increasing clouds. Areas of fog in the morning. Rain
showers. Chance of rain 80 percent. Highs 62 to 67. West winds up
to 10 mph.
.SATURDAY NIGHT...Decreasing clouds. Areas of fog after midnight.
Lows 36 to 43. Northwest winds up to 10 mph.
.SUNDAY...Areas of fog in the morning. Sunny. Highs 69 to 74.
Light winds.
.SUNDAY NIGHT...Mostly clear. Lows 40 to 45.
.MONDAY AND MONDAY NIGHT...Partly cloudy. Highs 71 to 76. Lows
41 to 46.
.TUESDAY...Partly cloudy. A slight chance of rain showers in the
afternoon. Chance of rain 20 percent. Highs 73 to 78.
.TUESDAY NIGHT THROUGH THURSDAY...Mostly clear. Lows 41 to 47.
Highs 74 to 80. Breezy.
&&
TEMPERATURE
Fairfield 66 38 65
$$
=
IDZ033-181600-
Upper Weiser River-
230 AM MDT Fri Sep 18 2026
.TODAY...Partly cloudy. A chance of showers this afternoon.
Chance of rain 30 percent. Highs 70 to 77. Light winds.
.TONIGHT...Partly cloudy. A chance of showers in the evening.
Chance of rain 30 percent. Lows 49 to 54. North winds up to
10 mph.
.SATURDAY...Patchy fog in the morning. Showers likely, mainly in
the morning. Chance of rain 70 percent. Highs 73 to 79. North
winds up to 10 mph.
.SATURDAY NIGHT...Mostly clear. Lows 50 to 55. North winds up to
10 mph.
.SUNDAY...Sunny. Highs 76 to 83. Northeast winds up to 10 mph in
the morning, becoming light in the afternoon.
.SUNDAY NIGHT AND MONDAY...Mostly clear. Lows 52 to 57. Highs
77 to 84.
.MONDAY NIGHT...Partly cloudy. Lows 52 to 57.
.TUESDAY THROUGH WEDNESDAY...Mostly clear. Highs 77 to 84. Lows
51 to 56.
.WEDNESDAY NIGHT...Increasing clouds. Lows 51 to 56.
.THURSDAY...Sunny. Highs 80 to 85.
&&
TEMPERATURE
Council 76 50 78
Cambridge 77 49 79
$$
=
ORZ064-181600-
Oregon Lower Treasure Valley-
230 AM MDT Fri Sep 18 2026 /130 AM PDT Fri Sep 18 2026/
.TODAY...Patchy fog this morning. Mostly sunny. Highs 75 to 80.
Northwest winds up to 10 mph.
.TONIGHT...Partly cloudy. A chance of showers in the evening.
Chance of rain 30 percent. Lows 48 to 55. Northwest winds around
10 mph with gusts to 20 mph.
.SATURDAY...Sunny. Highs 78 to 83. Northwest winds up to 10 mph.
.SATURDAY NIGHT...Mostly clear. Lows 48 to 55. Light winds.
.SUNDAY...Sunny. Highs 80 to 85. Light winds.
.SUNDAY NIGHT AND MONDAY...Mostly clear. Lows 49 to 56. Highs
81 to 86.
.MONDAY NIGHT...Partly cloudy. Lows 50 to 57.
.TUESDAY THROUGH THURSDAY...Mostly clear. Highs 80 to 88. Lows
48 to 56.
&&
TEMPERATURE
Ontario 78 48 80
$$
=
IDZ012-181600-
Lower Treasure Valley-
230 AM MDT Fri Sep 18 2026
.TODAY...Partly cloudy. A chance of showers this morning. Areas
of fog this morning. Chance of rain 30 percent. Highs 73 to 78.
Northwest winds up to 10 mph.
.TONIGHT...Mostly clear. Patchy fog after midnight. Lows 49 to
54. Northwest winds up to 10 mph.
.SATURDAY...Areas of fog in the morning. Mostly sunny. Highs
76 to 81. Northwest winds up to 10 mph.
.SATURDAY NIGHT...Mostly clear. Patchy fog after midnight. Lows
49 to 54. Light winds.
.SUNDAY...Patchy fog in the morning. Sunny. Highs 79 to 84. Light
winds.
.SUNDAY NIGHT AND MONDAY...Mostly clear. Lows 50 to 55. Highs
81 to 86.
.MONDAY NIGHT...Partly cloudy. Lows 52 to 57.
.TUESDAY THROUGH THURSDAY...Mostly clear. Highs 80 to 88. Lows
51 to 56.
&&
TEMPERATURE
Caldwell 76 50 79
$$
=
IDZ014-181600-
Upper Treasure Valley-
230 AM MDT Fri Sep 18 2026
.TODAY...Partly cloudy with a 30 percent chance of showers.
Patchy fog this morning. Patchy smoke this afternoon. Cooler with
highs 70 to 75. Northwest winds 10 to 15 mph with gusts to
25 mph.
.TONIGHT...Partly cloudy in the evening, then clearing. Areas of
fog after midnight. Lows 47 to 53. West winds 10 to 15 mph. Gusts
to 25 mph in the evening.
.SATURDAY...Areas of fog in the morning. Mostly sunny. Highs
73 to 78. Northwest winds up to 10 mph with gusts to 20 mph.
.SATURDAY NIGHT...Mostly clear. Areas of fog after midnight. Lows
47 to 54. Northwest winds up to 10 mph with gusts to 20 mph in
the evening, becoming light after midnight.
.SUNDAY...Areas of fog in the morning. Sunny. Highs 78 to 83.
Southeast winds up to 10 mph.
.SUNDAY NIGHT...Mostly clear. Patchy fog after midnight. Lows
49 to 55.
.MONDAY...Patchy fog in the morning. Mostly sunny. Highs 80 to
85.
.MONDAY NIGHT...Partly cloudy. Lows 50 to 56.
.TUESDAY THROUGH THURSDAY...Mostly clear. Highs 80 to 89. Lows
49 to 57. Breezy.
&&
TEMPERATURE
Boise 73 53 76
Mountain Home 73 47 76
$$
=
IDZ016-181600-
Western Magic Valley-
230 AM MDT Fri Sep 18 2026
.TODAY...Partly cloudy with a chance of showers. A slight chance
of thunderstorms this afternoon. Chance of rain 50 percent. Much
cooler with highs 66 to 71. Breezy. West winds up to 10 mph this
morning, increasing to 10 to 20 mph with gusts to 30 mph this
afternoon.
.TONIGHT...Partly cloudy in the evening, then clearing. Areas of
fog after midnight. Lows 45 to 50. Southwest winds 10 to 15 mph
with gusts to 25 mph.
.SATURDAY...Increasing clouds. Areas of fog in the morning. Rain
showers, mainly in the afternoon. Chance of rain 80 percent.
Highs 66 to 71. West winds up to 10 mph with gusts to 20 mph.
.SATURDAY NIGHT...Partly cloudy in the evening, then becoming
mostly clear. Patchy fog in the evening. Areas of fog after
midnight. Lows 44 to 49. West winds up to 10 mph in the evening,
becoming light after midnight.
.SUNDAY...Patchy fog in the morning. Sunny. Highs 73 to 78. East
winds up to 10 mph.
.SUNDAY NIGHT...Increasing clouds. Lows 46 to 52.
.MONDAY THROUGH TUESDAY...Partly cloudy. Highs 76 to 82. Lows
48 to 53.
.TUESDAY NIGHT THROUGH THURSDAY...Mostly clear. Lows 48 to 54.
Highs 78 to 86.
&&
TEMPERATURE
Jerome 68 46 67
Twin Falls 68 46 67
$$
=
IDZ029-181600-
Owyhee Mountains-
230 AM MDT Fri Sep 18 2026
.TODAY...Partly cloudy with a 30 percent chance of rain showers.
Patchy smoke this afternoon. Highs 65 to 70.
.TONIGHT...Partly cloudy with a chance of rain showers in the
evening, then mostly clear after midnight. Chance of rain
30 percent. Lows 43 to 53.
.SATURDAY...Mostly sunny. Highs 68 to 73.
.SATURDAY NIGHT...Mostly clear. Lows 44 to 54.
.SUNDAY...Sunny. Highs 72 to 78.
.SUNDAY NIGHT...Increasing clouds. Lows 46 to 54.
.MONDAY AND MONDAY NIGHT...Partly cloudy. Highs 74 to 80. Lows
47 to 56.
.TUESDAY THROUGH THURSDAY...Mostly clear. Highs 74 to 84. Lows
47 to 56.
$$
=
IDZ015-181600-
Southwest Highlands-
230 AM MDT Fri Sep 18 2026
.TODAY...Partly cloudy with a chance of rain showers. A slight
chance of thunderstorms this afternoon. Chance of rain
30 percent. Cooler with highs 64 to 69.
.TONIGHT...Partly cloudy with a slight chance of rain showers in
the evening, then mostly clear after midnight. Chance of rain
20 percent. Lows 41 to 47.
.SATURDAY...Patchy fog in the morning. Mostly sunny. Highs 66 to
72.
.SATURDAY NIGHT...Decreasing clouds. Lows 42 to 47.
.SUNDAY...Sunny. Highs 72 to 77.
.SUNDAY NIGHT THROUGH MONDAY NIGHT...Partly cloudy. Lows 46 to
53. Highs 75 to 80.
.TUESDAY THROUGH THURSDAY...Mostly clear. Highs 75 to 85. Lows
47 to 53.
$$
=
IDZ030-181600-
Southern Twin Falls County-
230 AM MDT Fri Sep 18 2026
.TODAY...Partly cloudy. A chance of rain showers with a slight
chance of thunderstorms this afternoon. Chance of rain
30 percent. Cooler with highs 64 to 69.
.TONIGHT...Partly cloudy. Lows 43 to 48.
.SATURDAY...Patchy fog in the morning. Mostly sunny. Highs 64 to
69.
.SATURDAY NIGHT...Mostly clear. Lows 43 to 48.
.SUNDAY...Sunny. Highs 71 to 76.
.SUNDAY NIGHT THROUGH MONDAY NIGHT...Partly cloudy. Lows 45 to
53. Highs 75 to 80.
.TUESDAY...Partly cloudy. A slight chance of showers in the
afternoon. Chance of rain 20 percent. Highs 75 to 80.
.TUESDAY NIGHT THROUGH THURSDAY...Mostly clear. Lows 47 to 54.
Highs 76 to 84.
$$
=
ORZ062-181600-
Baker County-
130 AM PDT Fri Sep 18 2026
.TODAY...Mostly sunny. Areas of fog this morning. A chance of
rain showers with a slight chance of thunderstorms this
afternoon. Chance of rain 30 percent. Highs 68 to 76. Northwest
winds up to 10 mph with gusts to 20 mph.
.TONIGHT...Partly cloudy with a chance of rain showers in the
evening, then mostly clear after midnight. Areas of fog after
midnight. Chance of rain 40 percent. Lows 38 to 52. Northwest
winds 10 to 15 mph.
.SATURDAY...Areas of fog in the morning. Sunny. Highs 72 to 79.
Northwest winds up to 10 mph.
.SATURDAY NIGHT...Mostly clear. Lows 39 to 53. Northwest winds up
to 10 mph.
.SUNDAY...Patchy fog in the morning. Sunny. Highs 75 to 82. Light
winds.
.SUNDAY NIGHT AND MONDAY...Mostly clear. Lows 41 to 55. Highs
76 to 84.
.MONDAY NIGHT...Decreasing clouds. Lows 42 to 55.
.TUESDAY...Sunny. Highs 76 to 83.
.TUESDAY NIGHT...Decreasing clouds. Lows 39 to 54.
.WEDNESDAY...Sunny. Highs 74 to 82.
.WEDNESDAY NIGHT AND THURSDAY...Partly cloudy. Lows 40 to 54.
Highs 76 to 84.
&&
TEMPERATURE
Baker City 72 38 75
$$
=
ORZ061-181600-
Harney County-
130 AM PDT Fri Sep 18 2026
.TODAY...Partly sunny this morning, then clearing. Areas of fog
this morning. Highs 66 to 72. West winds 10 to 15 mph.
.TONIGHT...Mostly clear. Lows 35 to 45. Northwest winds 10 to
15 mph.
.SATURDAY...Areas of fog in the morning. Sunny. Highs 69 to 76.
Light winds.
.SATURDAY NIGHT...Mostly clear. Lows 37 to 48. Light winds.
.SUNDAY...Sunny. Highs 72 to 80. Light winds.
.SUNDAY NIGHT...Increasing clouds. Lows 39 to 50.
.MONDAY AND MONDAY NIGHT...Partly cloudy. Highs 73 to 81. Lows
39 to 51.
.TUESDAY THROUGH WEDNESDAY...Mostly clear. Highs 73 to 81. Lows
38 to 50.
.WEDNESDAY NIGHT AND THURSDAY...Partly cloudy. Lows 39 to 51.
Highs 76 to 84.
&&
TEMPERATURE
Burns 72 35 76
$$
=
ORZ063-181600-
Malheur County-
230 AM MDT Fri Sep 18 2026 /130 AM PDT Fri Sep 18 2026/
.TODAY...Areas of fog this morning. Mostly sunny. Highs 69 to 76.
West winds up to 10 mph.
.TONIGHT...Partly cloudy with a chance of rain showers in the
evening, then mostly clear after midnight. Patchy fog after
midnight. Chance of rain 30 percent. Lows 41 to 51. West winds up
to 10 mph.
.SATURDAY...Areas of fog in the morning. Sunny. Highs 72 to 79.
West winds up to 10 mph.
.SATURDAY NIGHT...Mostly clear. Lows 42 to 52. North winds up to
10 mph in the evening, becoming light after midnight.
.SUNDAY...Sunny. Highs 77 to 82. Light winds.
.SUNDAY NIGHT...Increasing clouds. Lows 45 to 55.
.MONDAY AND MONDAY NIGHT...Partly cloudy. Highs 78 to 83. Lows
46 to 56.
.TUESDAY THROUGH THURSDAY...Mostly clear. Highs 78 to 86. Lows
46 to 55.
$$
=