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MIZ001-220800-
Recreational Forecast for Isle Royale National Park
National Weather Service Marquette MI
501 PM EDT Thu Aug 21 2025

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

.TONIGHT...Mostly cloudy. A slight chance of thunderstorms through
midnight. A chance of showers. A chance of thunderstorms late. Lows
around 62. South winds 5 to 10 mph becoming southwest 5 to 15 mph
late. Waves calm to 1 foot building to 1 to 2 feet.
.FRIDAY...A slight chance of showers and thunderstorms through early
afternoon, then a chance of showers and a slight chance of
thunderstorms by mid afternoon. Partly sunny. Highs around 67 at the
shore and 72 to 77 inland. Southwest winds 5 to 15 mph. Chance of
precipitation 30 percent. Waves building to 2 to 3 feet.
.FRIDAY NIGHT...Mostly clear. Lows around 61. Southwest winds 10 to
15 mph becoming west late. Waves 2 to 3 feet.
.SATURDAY...Mostly sunny. Highs around 67. West winds 10 to 20 mph.
Waves 2 to 3 feet.
.SATURDAY NIGHT...Partly cloudy through midnight then becoming
mostly cloudy. Lows around 57. Northwest winds 15 to 20 mph. Waves
2 to 3 feet.
.SUNDAY...Mostly cloudy with a 40 percent chance of rain showers.
Highs around 59.
.SUNDAY NIGHT...A chance of rain showers through midnight. Mostly
cloudy. Lows around 54. Chance of showers 30 percent.
.MONDAY...Partly cloudy. Highs around 64.
.MONDAY NIGHT AND TUESDAY...Mostly clear. Lows 53 to 58. Highs
around 67.
.TUESDAY NIGHT THROUGH WEDNESDAY NIGHT...Partly cloudy. Lows 58 to
63. Highs 67 to 72.
.THURSDAY...Sunny. Highs 67 to 72.

&&

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

.TONIGHT...Mostly cloudy. A slight chance of showers and
thunderstorms by midnight. A chance of showers and thunderstorms
late, then a slight chance of showers and thunderstorms late. Lows
around 61. South winds 5 to 10 mph becoming southwest late. Waves
calm to 1 foot.
.FRIDAY...Partly cloudy with a 20 percent chance of showers and
thunderstorms. Patchy fog. Highs around 65 at the shore and 69 to
74 inland. West winds 5 to 15 mph. Waves building to 1 to 2 feet.
.FRIDAY NIGHT...Partly cloudy. Lows around 60. Southwest winds 10 to
15 mph becoming west late. Waves 1 to 2 feet.
.SATURDAY...Sunny through early afternoon then becoming partly
cloudy. Highs around 65. West winds 10 to 20 mph. Waves building to
2 to 3 feet subsiding to 1 to 2 feet.
.SATURDAY NIGHT...Mostly cloudy. Lows around 56. Northwest winds
15 to 20 mph. Waves building to 2 to 3 feet.
.SUNDAY...Mostly cloudy with a 30 percent chance of rain showers.
Highs around 58.
.SUNDAY NIGHT...Breezy. Mostly cloudy with a 40 percent chance of
rain showers. Lows around 53.
.MONDAY AND MONDAY NIGHT...Breezy. Partly cloudy. Highs around 62.
Lows around 55.
.TUESDAY...Sunny. Highs around 65.
.TUESDAY NIGHT THROUGH THURSDAY...Partly cloudy. Lows around 59.
Highs 65 to 70.

&&

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

.TONIGHT...Mostly cloudy. A slight chance of thunderstorms through
midnight. A chance of showers. A chance of thunderstorms late. Lows
around 61. South winds 5 to 10 mph becoming southwest late. Waves
calm to 1 foot.
.FRIDAY...Partly cloudy with a 20 percent chance of rain showers and
thunderstorms. Patchy fog by mid afternoon. Highs around 65 at the
shore and 71 to 76 inland. West winds 5 to 15 mph. Waves building to
1 to 2 feet.
.FRIDAY NIGHT...Partly cloudy. Lows around 61. Southwest winds 10 to
15 mph becoming west 10 to 20 mph late. Waves building to 2 to
3 feet.
.SATURDAY...Mostly sunny. Highs around 66. West winds 15 to 20 mph.
Waves 2 to 3 feet.
.SATURDAY NIGHT...Partly cloudy through midnight then becoming
mostly cloudy. Lows around 57. Northwest winds 15 to 20 mph. Waves
2 to 3 feet.
.SUNDAY...Mostly cloudy with a 30 percent chance of rain showers.
Highs around 58.
.SUNDAY NIGHT...Breezy. A chance of rain showers through midnight.
Mostly cloudy. Lows around 54. Chance of showers 40 percent.
.MONDAY...Breezy. Partly cloudy. Highs around 63.
.MONDAY NIGHT AND TUESDAY...Mostly clear. Lows 53 to 58. Highs
around 66.
.TUESDAY NIGHT THROUGH WEDNESDAY NIGHT...Partly cloudy. Lows 57 to
62. Highs 66 to 71.
.THURSDAY...Sunny. Highs 65 to 70.

&&

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

.TONIGHT...Mostly cloudy. A slight chance of showers and
thunderstorms by midnight. A chance of showers and thunderstorms
late, then a slight chance of showers and thunderstorms late. Lows
around 61. Southeast winds 5 to 10 mph becoming southwest 5 to
15 mph late. Waves calm to 1 foot building to 1 to 2 feet.
.FRIDAY...A slight chance of showers and thunderstorms through early
afternoon, then a chance of showers and a slight chance of
thunderstorms by mid afternoon. Partly sunny. Highs around 66 at the
shore and 72 to 77 inland. West winds 5 to 15 mph. Chance of
precipitation 30 percent. Waves building to 2 to 3 feet.
.FRIDAY NIGHT...Partly cloudy. Lows around 60. Southwest winds 10 to
15 mph becoming west late. Waves subsiding to 1 to 2 feet.
.SATURDAY...Mostly sunny. Highs around 66. West winds 10 to 20 mph.
Waves building to 2 to 3 feet.
.SATURDAY NIGHT...Partly cloudy through midnight then becoming
mostly cloudy. Lows around 57. Northwest winds 15 to 20 mph. Waves
subsiding to 1 to 2 feet.
.SUNDAY...Mostly cloudy with a 40 percent chance of rain showers.
Highs around 59.
.SUNDAY NIGHT...Mostly cloudy with a 30 percent chance of rain
showers. Lows around 54.
.MONDAY AND MONDAY NIGHT...Partly cloudy. Highs around 64. Lows
around 55.
.TUESDAY...Sunny. Highs around 67.
.TUESDAY NIGHT THROUGH THURSDAY...Partly cloudy. Lows around 59.
Highs 66 to 71.

&&


$$