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Recreational Forecast for Isle Royale National Park
National Weather Service Marquette MI
501 AM EDT Tue Sep 16 2025

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

.TODAY...Partly cloudy through mid afternoon then clearing. Patchy
fog early. Highs around 66 at the shore and 71 to 76 inland. South
winds 5 to 15 mph. Waves 1 to 2 feet subsiding to calm to 1 foot.
.TONIGHT...Partly cloudy with a 20 percent chance of rain showers
and thunderstorms. Patchy fog late. Lows around 59. South winds 5 to
10 mph becoming west late. Waves building to 1 to 2 feet.
.WEDNESDAY...Sunny through early afternoon then becoming partly
cloudy. Patchy fog through early afternoon. Highs around 65 at the
shore and 70 to 75 inland. West winds up to 10 mph becoming
southwest late. Waves subsiding to calm to 1 foot.
.WEDNESDAY NIGHT...Mostly cloudy. Lows around 55. Northwest winds up
to 10 mph becoming northeast by midnight. Waves building to 1 to
2 feet.
.THURSDAY...Partly sunny. Highs around 59 at the shore and 62 to
67 inland. Northeast winds 5 to 15 mph becoming east 5 to 10 mph
late. Waves subsiding to calm to 1 foot.
.THURSDAY NIGHT AND FRIDAY...Partly cloudy. Lows around 53. Highs
around 56 at the shore and 59 to 64 inland.
.FRIDAY NIGHT...Partly cloudy through midnight then becoming mostly
cloudy. Lows around 53.
.SATURDAY...A chance of rain showers through early afternoon. Mostly
cloudy. Highs around 59 at the shore and 62 to 67 inland. Chance of
showers 30 percent.
.SATURDAY NIGHT...Mostly cloudy with a chance of rain showers. Lows
around 55. Chance of showers 40 percent.
.SUNDAY...Partly sunny with a 30 percent chance of rain showers.
Highs around 60 at the shore and 63 to 68 inland.
.SUNDAY NIGHT...Mostly cloudy. Lows around 55.
.MONDAY...A chance of rain showers by mid afternoon. Mostly cloudy.
Highs around 61 at the shore and 65 to 70 inland. Chance of showers
30 percent.

&&

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

.TODAY...Partly cloudy through early afternoon then clearing. Patchy
fog early. Highs around 63 at the shore and 67 to 72 inland. South
winds 5 to 15 mph. Waves 2 to 3 feet subsiding to 1 to 2 feet.
.TONIGHT...Partly cloudy with a 20 percent chance of rain showers
and thunderstorms. Patchy fog late. Lows around 58. South winds 5 to
15 mph becoming west late. Waves subsiding to calm to 1 foot.
.WEDNESDAY...Sunny through early afternoon then becoming partly
cloudy. Patchy fog through early afternoon. Highs around 62 at the
shore and 68 to 73 inland. West winds up to 10 mph becoming up to
5 mph late. Waves calm to 1 foot.
.WEDNESDAY NIGHT...Mostly cloudy. Lows around 54. Northwest winds up
to 10 mph becoming north by midnight. Waves building to 1 to 2 feet.
.THURSDAY...Partly sunny. Highs 57 to 62. Northeast winds 5 to
15 mph becoming 5 to 10 mph late. Waves subsiding to calm to 1 foot.
.THURSDAY NIGHT...Mostly cloudy through midnight then becoming
partly cloudy. Lows around 52.
.FRIDAY...Mostly sunny. Highs 55 to 60.
.FRIDAY NIGHT AND SATURDAY...Mostly cloudy. Lows around 52. Highs
57 to 62.
.SATURDAY NIGHT AND SUNDAY...A 30 percent chance of rain showers.
Mostly cloudy. Lows around 54. Highs 58 to 63.
.SUNDAY NIGHT...Mostly cloudy. Lows around 54.
.MONDAY...A chance of rain showers by mid afternoon. Mostly cloudy.
Highs around 60 at the shore and 63 to 68 inland. Chance of showers
30 percent.

&&

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

.TODAY...Partly cloudy through early afternoon then clearing. Patchy
fog early. Highs around 64 at the shore and 71 to 76 inland. South
winds 5 to 15 mph. Waves 1 to 2 feet.
.TONIGHT...Partly cloudy with a 20 percent chance of rain showers
and thunderstorms. Patchy fog late. Lows around 58. South winds 5 to
15 mph becoming west late. Waves subsiding to calm to 1 foot.
.WEDNESDAY...Mostly sunny. Patchy fog through early afternoon. Highs
around 64 at the shore and 70 to 75 inland. West winds up to 10 mph.
Waves calm to 1 foot.
.WEDNESDAY NIGHT...Mostly cloudy. Lows around 54. Northwest winds
5 to 10 mph becoming northeast 5 to 15 mph by midnight. Waves
building to 1 to 2 feet.
.THURSDAY...Partly sunny. Highs around 59 at the shore and 62 to
67 inland. Northeast winds 10 to 15 mph decreasing to 5 to 10 mph by
mid afternoon. Waves subsiding to calm to 1 foot.
.THURSDAY NIGHT AND FRIDAY...Partly cloudy. Lows around 52. Highs
around 57 at the shore and 59 to 64 inland.
.FRIDAY NIGHT AND SATURDAY...Mostly cloudy. Lows around 53. Highs
around 59 at the shore and 61 to 66 inland.
.SATURDAY NIGHT...A chance of rain showers late. Mostly cloudy. Lows
around 54. Chance of showers 30 percent.
.SUNDAY THROUGH MONDAY...Mostly cloudy. Highs around 59 at the shore
and 65 to 70 inland. Lows around 55.

&&

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

.TODAY...Partly cloudy. Patchy fog early. Highs around 65 at the
shore and 71 to 76 inland. South winds 5 to 15 mph. Waves 1 to
2 feet subsiding to calm to 1 foot.
.TONIGHT...Partly cloudy with a 20 percent chance of rain showers
and thunderstorms. Patchy fog late. Lows around 58. South winds 5 to
10 mph becoming west late. Waves building to 1 to 2 feet.
.WEDNESDAY...Mostly sunny. Patchy fog through early afternoon. Highs
around 67 at the shore and 71 to 76 inland. West winds 5 to 10 mph
decreasing to up to 5 mph by mid afternoon. Waves subsiding to calm
to 1 foot.
.WEDNESDAY NIGHT...Mostly cloudy. Lows around 54. Northwest winds up
to 5 mph becoming northeast 5 to 15 mph by midnight. Waves calm to
1 foot.
.THURSDAY...Partly sunny. Highs around 59 at the shore and 61 to
66 inland. Northeast winds 5 to 15 mph becoming east 5 to 10 mph
late. Waves building to 1 to 2 feet, then subsiding to calm to
1 foot.
.THURSDAY NIGHT...Mostly cloudy. Lows around 52.
.FRIDAY...Partly cloudy. Highs 57 to 62.
.FRIDAY NIGHT...Mostly cloudy. Lows around 52.
.SATURDAY...A chance of rain showers through early afternoon. Mostly
cloudy. Highs around 59 at the shore and 61 to 66 inland. Chance of
showers 30 percent.
.SATURDAY NIGHT...A chance of rain showers. Mostly cloudy. Lows
around 54. Chance of showers 40 percent.
.SUNDAY...Partly sunny with a 30 percent chance of rain showers.
Highs around 60 at the shore and 62 to 67 inland.
.SUNDAY NIGHT...Mostly cloudy. Lows around 55.
.MONDAY...A chance of rain showers by mid afternoon. Mostly cloudy.
Highs around 61 at the shore and 64 to 69 inland. Chance of showers
30 percent.

&&


$$