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MIZ001-010800-
Recreational Forecast for Isle Royale National Park
National Weather Service Marquette MI
501 PM EDT Sun Aug 31 2025

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

.TONIGHT...Patchy fog by midnight. Isolated showers and
thunderstorms late. Partly cloudy through midnight then becoming
mostly cloudy. Lows around 60. South winds up to 10 mph becoming
southwest late. Waves calm to 1 foot.
.LABOR DAY...Patchy fog through early afternoon. Partly sunny with
isolated showers and thunderstorms through early afternoon, then
mostly sunny by mid afternoon. Highs around 65 at the shore and
69 to 74 inland. Southwest winds up to 10 mph. Chance of
precipitation 20 percent. Waves calm to 1 foot.
.MONDAY NIGHT...Partly cloudy. Lows around 60. Southwest winds 5 to
10 mph. Waves calm to 1 foot.
.TUESDAY...A 20 percent chance of showers and thunderstorms by mid
afternoon. Mostly sunny. Highs around 65 at the shore and 68 to
73 inland. Southwest winds 5 to 15 mph. Waves building to 1 to
2 feet.
.TUESDAY NIGHT...Rain showers likely and a chance of thunderstorms
through midnight, then rain showers and a chance of thunderstorms
late. Lows around 51. Southwest winds 5 to 15 mph becoming northwest
10 to 20 mph late. Chance of precipitation 80 percent. Waves
building to 2 to 3 feet.
.WEDNESDAY...Breezy, cooler. Rain showers likely through early
afternoon, then a chance of rain showers by mid afternoon. Mostly
cloudy. Highs around 55. Chance of showers 60 percent.
.WEDNESDAY NIGHT...Breezy. Mostly cloudy with a 50 percent chance of
rain showers. Lows around 44.
.THURSDAY...Cool. Mostly cloudy with a 40 percent chance of rain
showers. Highs around 50.
.THURSDAY NIGHT...Cloudy with a 40 percent chance of rain showers.
Lows around 44.
.FRIDAY...Mostly cloudy with a 40 percent chance of rain showers.
Highs around 54.
.FRIDAY NIGHT AND SATURDAY...Mostly cloudy. Lows around 46. Highs
around 57.
.SATURDAY NIGHT AND SUNDAY...Partly cloudy. Lows around 49. Highs
around 60.

&&

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

.TONIGHT...Partly cloudy. Patchy fog late. Lows around 59. South
winds up to 10 mph becoming southwest late. Waves calm to 1 foot.
.LABOR DAY...Partly cloudy. Patchy fog through early afternoon.
Highs 66 to 71. Southwest winds up to 10 mph. Waves calm to 1 foot.
.MONDAY NIGHT...Partly cloudy. Lows around 59. Southwest winds 5 to
10 mph. Waves calm to 1 foot.
.TUESDAY...Sunny through early afternoon, then partly cloudy with a
20 percent chance of rain showers by mid afternoon. Highs 65 to 70.
Southwest winds 5 to 15 mph. Waves building to 1 to 2 feet.
.TUESDAY NIGHT...A chance of rain showers and thunderstorms through
midnight, then rain showers and a chance of thunderstorms late.
Cloudy. Lows around 51. Southwest winds 5 to 15 mph becoming
northwest 10 to 20 mph late. Chance of precipitation 80 percent.
Waves building to 2 to 3 feet.
.WEDNESDAY...Breezy, cooler. Rain showers likely through early
afternoon, then a chance of rain showers by mid afternoon. Cloudy.
Highs around 54. Chance of showers 70 percent.
.WEDNESDAY NIGHT...Breezy. Cloudy with a 40 percent chance of rain
showers. Lows around 44.
.THURSDAY...Cool. Mostly cloudy with a 40 percent chance of rain
showers. Highs around 49.
.THURSDAY NIGHT...Cloudy with a 30 percent chance of rain showers.
Lows around 45.
.FRIDAY...Mostly cloudy with a 30 percent chance of rain showers.
Highs around 53.
.FRIDAY NIGHT AND SATURDAY...Mostly cloudy. Lows around 46. Highs
around 55.
.SATURDAY NIGHT...Mostly cloudy. Lows around 49.
.SUNDAY...Partly cloudy. Highs around 58.

&&

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

.TONIGHT...Partly cloudy. Patchy fog late. Lows around 60. South
winds up to 10 mph becoming southwest late. Waves calm to 1 foot.
.LABOR DAY...Partly cloudy. Patchy fog through early afternoon.
Highs around 67 at the shore and 69 to 74 inland. Southwest winds up
to 10 mph. Waves calm to 1 foot.
.MONDAY NIGHT...Partly cloudy. Lows around 60. Southwest winds 5 to
10 mph. Waves calm to 1 foot.
.TUESDAY...Sunny through early afternoon, then partly cloudy with a
20 percent chance of showers and thunderstorms by mid afternoon.
Highs 66 to 71. Southwest winds 5 to 15 mph. Waves building to 1 to
2 feet.
.TUESDAY NIGHT...Rain showers likely and a chance of thunderstorms
through midnight, then rain showers and a chance of thunderstorms
late. Lows around 51. Southwest winds 10 to 15 mph becoming
northwest 10 to 20 mph late. Chance of precipitation 80 percent.
Waves subsiding to calm to 1 foot building to 2 to 3 feet.
.WEDNESDAY...Breezy, cooler. Rain showers likely through early
afternoon, then a chance of rain showers by mid afternoon. Mostly
cloudy. Highs around 54. Chance of showers 70 percent.
.WEDNESDAY NIGHT...Breezy. Cloudy with a 40 percent chance of rain
showers. Lows around 44.
.THURSDAY...Cool. Mostly cloudy with a 40 percent chance of rain
showers. Highs around 50.
.THURSDAY NIGHT...Cloudy with a 30 percent chance of rain showers.
Lows around 45.
.FRIDAY...Mostly cloudy with a 30 percent chance of rain showers.
Highs around 53.
.FRIDAY NIGHT AND SATURDAY...Mostly cloudy. Lows around 47. Highs
around 56.
.SATURDAY NIGHT...Mostly cloudy through midnight then becoming
partly cloudy. Lows around 50.
.SUNDAY...Mostly sunny. Highs around 60.

&&

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

.TONIGHT...Partly cloudy. Patchy fog late. Lows around 59. South
winds up to 10 mph becoming southwest late. Waves calm to 1 foot.
.LABOR DAY...Partly cloudy. Patchy fog through early afternoon.
Highs around 67 at the shore and 69 to 74 inland. Southwest winds up
to 10 mph. Waves calm to 1 foot.
.MONDAY NIGHT...Partly cloudy. Lows around 59. Southwest winds 5 to
10 mph. Waves calm to 1 foot.
.TUESDAY...A 20 percent chance of rain showers by mid afternoon.
Partly cloudy. Highs 66 to 71. Southwest winds 5 to 15 mph. Waves
building to 1 to 2 feet.
.TUESDAY NIGHT...Rain showers likely and a chance of thunderstorms
through midnight, then rain showers and a chance of thunderstorms
late. Lows around 51. Southwest winds 5 to 15 mph becoming northwest
10 to 15 mph late. Chance of precipitation 80 percent. Waves 1 to
2 feet.
.WEDNESDAY...Cooler. Rain showers likely through early afternoon,
then a chance of rain showers by mid afternoon. Cloudy. Highs around
54. Chance of showers 60 percent.
.WEDNESDAY NIGHT...Cloudy with a 50 percent chance of rain showers.
Lows around 43.
.THURSDAY...Cool. Mostly cloudy with a 40 percent chance of rain
showers. Highs around 50.
.THURSDAY NIGHT...Cloudy with a 40 percent chance of rain showers.
Lows around 45.
.FRIDAY...Mostly cloudy with a 40 percent chance of rain showers.
Highs around 54.
.FRIDAY NIGHT AND SATURDAY...Mostly cloudy. Lows around 46. Highs
around 56.
.SATURDAY NIGHT...Mostly cloudy through midnight then becoming
partly cloudy. Lows around 49.
.SUNDAY...Partly cloudy. Highs around 60.

&&


$$