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MIZ001-180800-
Recreational Forecast for Isle Royale National Park
National Weather Service Marquette MI
501 PM EDT Sun Aug 17 2025

Isle Royale (SW areas)-
Including Greenstone Ridge South, Little Todd Harbor, Minong Ridge,
and Windigo-

.TONIGHT...Partly cloudy through midnight, then mostly cloudy with a
50 percent chance of rain showers late. Lows around 58. East winds
5 to 15 mph becoming southeast 10 to 15 mph late. Waves calm to
1 foot building to 1 to 2 feet.
.MONDAY...Rain showers through early afternoon, then rain showers
likely and a chance of thunderstorms by mid afternoon. Highs around
66. Southeast winds 10 to 20 mph. Chance of precipitation
90 percent. Waves building to 2 to 3 feet.
.MONDAY NIGHT...A 40 percent chance of showers through midnight.
Cloudy. Lows around 62. Southeast winds 10 to 15 mph becoming north
late. Waves subsiding to 1 to 2 feet.
.TUESDAY...Partly sunny through early afternoon then becoming mostly
sunny. Highs 66 to 71. North winds 5 to 15 mph. Waves building to
2 to 3 feet subsiding to calm to 1 foot.
.TUESDAY NIGHT...Mostly clear. Lows around 63. Northwest winds 5 to
10 mph becoming north late. Waves calm to 1 foot.
.WEDNESDAY...Sunny. Highs 70 to 75.
.WEDNESDAY NIGHT AND THURSDAY...Partly cloudy. Lows around 65. Highs
72 to 77.
.THURSDAY NIGHT...Warm. Mostly cloudy. Lows around 66.
.FRIDAY AND FRIDAY NIGHT...Partly cloudy. Highs 72 to 77. Lows
around 62.
.SATURDAY THROUGH SUNDAY...Partly cloudy. Highs around 67. Lows
around 59.

&&

Isle Royale (NE areas)-
Including Greenstone Ridge North, Malone Bay, Mount Saginaw,
and Rock Harbor-

.TONIGHT...Partly cloudy through midnight, then mostly cloudy with a
40 percent chance of rain showers late. Lows around 58. East winds
5 to 15 mph becoming southeast 10 to 15 mph late. Waves 1 to 2 feet
building to 2 to 3 feet.
.MONDAY...Breezy. Rain showers through early afternoon, then rain
showers likely and a slight chance of thunderstorms by mid
afternoon. Highs 62 to 67. Southeast winds 10 to 20 mph. Chance of
precipitation 90 percent. Waves building to 4 to 7 feet.
.MONDAY NIGHT...A 40 percent chance of rain showers through
midnight. Cloudy. Lows around 60. Southeast winds 10 to 20 mph
becoming northeast 10 to 15 mph late. Waves 4 to 7 feet.
.TUESDAY...Mostly cloudy through early afternoon then becoming
mostly sunny. Highs around 66. North winds 5 to 15 mph becoming 5 to
10 mph late. Waves subsiding to 1 to 2 feet.
.TUESDAY NIGHT...Partly cloudy. Lows around 62. North winds 5 to
10 mph. Waves subsiding to calm to 1 foot.
.WEDNESDAY...Sunny. Highs 67 to 72.
.WEDNESDAY NIGHT AND THURSDAY...Partly cloudy. Lows around 63. Highs
around 71.
.THURSDAY NIGHT...Mostly cloudy. Lows around 64.
.FRIDAY AND FRIDAY NIGHT...Partly cloudy. Highs around 72. Lows
around 60.
.SATURDAY THROUGH SUNDAY...Partly cloudy. Highs around 64. Lows
around 57.

&&

Isle Royale (NW areas)-
Including Amygdaloid Island, Lookout Louise, and Minong Mine-

.TONIGHT...Partly cloudy through midnight, then mostly cloudy with a
40 percent chance of rain showers late. Lows around 58. Southeast
winds 5 to 15 mph. Waves calm to 1 foot building to 2 to 3 feet.
.MONDAY...Breezy. Showers through early afternoon, then showers
likely and a slight chance of thunderstorms by mid afternoon. Highs
64 to 69. Southeast winds 10 to 20 mph. Chance of precipitation
80 percent. Waves building to 3 to 6 feet.
.MONDAY NIGHT...A 40 percent chance of showers through midnight.
Cloudy. Lows around 62. Southeast winds 10 to 20 mph becoming
northeast 10 to 15 mph late. Waves 3 to 6 feet.
.TUESDAY...Partly sunny through early afternoon then clearing. Highs
65 to 70. North winds 5 to 15 mph. Waves subsiding to 1 to 2 feet.
.TUESDAY NIGHT...Mostly clear. Lows around 63. North winds 5 to
10 mph. Waves subsiding to calm to 1 foot.
.WEDNESDAY...Sunny. Highs 68 to 73.
.WEDNESDAY NIGHT AND THURSDAY...Partly cloudy. Lows 63 to 68. Highs
around 72.
.THURSDAY NIGHT...Warm. Mostly cloudy. Lows around 66.
.FRIDAY AND FRIDAY NIGHT...Partly cloudy. Highs around 73. Lows
around 62.
.SATURDAY THROUGH SUNDAY...Partly cloudy. Highs around 65. Lows
around 59.

&&

Isle Royale (SE areas)-
Including Feldtman Ridge, Rainbow Cove, and Siskiwit Bay-

.TONIGHT...Partly cloudy through midnight, then mostly cloudy with a
40 percent chance of rain showers late. Lows around 58. East winds
10 to 15 mph becoming southeast late. Waves 2 to 3 feet.
.MONDAY...Rain showers through early afternoon, then rain showers
likely and a chance of thunderstorms by mid afternoon. Highs 63 to
68. Southeast winds 10 to 20 mph. Chance of precipitation
90 percent. Waves building to 3 to 5 feet.
.MONDAY NIGHT...A 40 percent chance of rain showers through
midnight. Cloudy. Lows around 60. Southeast winds 10 to 20 mph
becoming north 10 to 15 mph late. Waves subsiding to 2 to 3 feet.
.TUESDAY...Mostly cloudy through early afternoon then becoming
partly cloudy. Highs 66 to 71. North winds 5 to 15 mph. Waves
subsiding to 1 to 2 feet.
.TUESDAY NIGHT...Partly cloudy. Lows around 62. North winds up to
10 mph. Waves subsiding to calm to 1 foot.
.WEDNESDAY...Sunny. Highs 69 to 74.
.WEDNESDAY NIGHT AND THURSDAY...Partly cloudy. Lows around 64. Highs
71 to 76.
.THURSDAY NIGHT...Warm. Mostly cloudy. Lows around 65.
.FRIDAY AND FRIDAY NIGHT...Partly cloudy. Highs 72 to 77. Lows 59 to
64.
.SATURDAY THROUGH SUNDAY...Partly cloudy. Highs 63 to 68. Lows
around 58.

&&


$$