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MIZ001-210800-
Recreational Forecast for Isle Royale National Park
National Weather Service Marquette MI
501 PM EDT Wed Aug 20 2025

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

.TONIGHT...Partly cloudy. Patchy fog. Lows around 57. Southwest
winds 5 to 10 mph. Waves calm to 1 foot.
.THURSDAY...Partly cloudy. Patchy fog through early afternoon. Highs
67 to 72. Southwest winds 5 to 10 mph. Waves calm to 1 foot.
.THURSDAY NIGHT...A 20 percent chance of showers and thunderstorms
late. Mostly cloudy. Lows around 61. South winds 5 to 10 mph
becoming southwest 10 to 15 mph late. Waves building to 1 to 2 feet.
.FRIDAY...Partly sunny with a chance of showers and thunderstorms
through early afternoon, then mostly sunny with a slight chance of
showers and thunderstorms by mid afternoon. Highs 70 to 75.
Southwest winds 10 to 15 mph. Chance of precipitation 30 percent.
Waves building to 2 to 3 feet.
.FRIDAY NIGHT...Partly cloudy. Lows around 61. West winds 10 to
15 mph. Waves 2 to 3 feet.
.SATURDAY...Sunny through early afternoon then becoming partly
cloudy. Highs around 67.
.SATURDAY NIGHT...Mostly cloudy. Lows around 56.
.SUNDAY...Partly sunny with a 30 percent chance of rain showers.
Highs around 63.
.SUNDAY NIGHT...Mostly cloudy. Lows 52 to 57.
.MONDAY AND MONDAY NIGHT...Partly cloudy. Highs around 64. Lows
around 55.
.TUESDAY THROUGH WEDNESDAY...Partly cloudy. Highs 67 to 72. Lows
56 to 61.

&&

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

.TONIGHT...Partly cloudy. Patchy fog through midnight. Areas of fog
late, then areas of dense fog late. Lows around 57. Southwest winds
5 to 10 mph. Waves calm to 1 foot.
.THURSDAY...Partly sunny. Patchy fog through early afternoon. Highs
65 to 70. Southwest winds 5 to 10 mph becoming south late. Waves
calm to 1 foot.
.THURSDAY NIGHT...A 20 percent chance of showers and thunderstorms
late. Mostly cloudy. Lows around 61. South winds 5 to 10 mph
becoming southwest 5 to 15 mph late. Waves building to 1 to 2 feet.
.FRIDAY...Partly sunny with a chance of showers and thunderstorms
through early afternoon, then mostly sunny with a chance of showers
and a slight chance of thunderstorms by mid afternoon. Highs 68 to
73. Southwest winds 10 to 15 mph. Chance of precipitation
30 percent. Waves building to 2 to 3 feet.
.FRIDAY NIGHT...Partly cloudy. Lows around 60. West winds 10 to
15 mph. Waves subsiding to 1 to 2 feet.
.SATURDAY...Mostly sunny. Highs around 66.
.SATURDAY NIGHT THROUGH SUNDAY NIGHT...Mostly cloudy. Lows around
55. Highs around 61.
.MONDAY THROUGH TUESDAY...Partly cloudy. Highs around 63. Lows
around 55.
.TUESDAY NIGHT AND WEDNESDAY...Partly cloudy. Lows around 58. Highs
64 to 69.

&&

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

.TONIGHT...Partly cloudy. Patchy fog through midnight. Areas of fog
late. Lows around 57. Southwest winds 5 to 10 mph. Waves calm to
1 foot.
.THURSDAY...Partly cloudy. Patchy fog through early afternoon. Highs
66 to 71. Southwest winds 5 to 10 mph becoming south late. Waves
calm to 1 foot.
.THURSDAY NIGHT...A 20 percent chance of showers and thunderstorms
late. Mostly cloudy. Lows around 61. South winds 5 to 10 mph
becoming southwest 5 to 15 mph late. Waves calm to 1 foot.
.FRIDAY...A chance of showers and thunderstorms through early
afternoon, then a slight chance of showers and thunderstorms by mid
afternoon. Partly cloudy. Highs 69 to 74. Southwest winds 10 to
15 mph. Chance of precipitation 30 percent. Waves building to 1 to
2 feet.
.FRIDAY NIGHT...Partly cloudy. Lows around 61. West winds 10 to
15 mph. Waves 1 to 2 feet.
.SATURDAY...Sunny through early afternoon then becoming partly
cloudy. Highs around 67.
.SATURDAY NIGHT AND SUNDAY...Mostly cloudy. Lows around 57. Highs
around 62.
.SUNDAY NIGHT...Mostly cloudy. Lows around 54.
.MONDAY AND MONDAY NIGHT...Partly cloudy. Highs around 63. Lows
around 55.
.TUESDAY...Sunny. Highs around 66.
.TUESDAY NIGHT AND WEDNESDAY...Partly cloudy. Lows around 58. Highs
65 to 70.

&&

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

.TONIGHT...Partly cloudy. Patchy fog by midnight. Areas of fog late.
Lows around 57. Southwest winds 5 to 10 mph. Waves calm to 1 foot.
.THURSDAY...Partly sunny. Patchy fog through early afternoon. Highs
67 to 72. Southwest winds 5 to 10 mph becoming south late. Waves
calm to 1 foot.
.THURSDAY NIGHT...A 20 percent chance of showers and thunderstorms
late. Mostly cloudy. Lows around 61. South winds 5 to 10 mph
becoming southwest 5 to 15 mph late. Waves building to 1 to 2 feet.
.FRIDAY...Partly sunny with a chance of showers and thunderstorms
through early afternoon, then mostly sunny with a slight chance of
showers and thunderstorms by mid afternoon. Highs 70 to 75.
Southwest winds 10 to 15 mph. Chance of precipitation 30 percent.
Waves building to 2 to 3 feet.
.FRIDAY NIGHT...Partly cloudy. Lows around 61. West winds 10 to
15 mph. Waves subsiding to 1 to 2 feet, then building to 2 to
3 feet.
.SATURDAY...Partly cloudy. Highs around 67.
.SATURDAY NIGHT...Mostly cloudy. Lows around 56.
.SUNDAY...Partly sunny with a 30 percent chance of rain showers.
Highs around 62.
.SUNDAY NIGHT...Mostly cloudy. Lows around 54.
.MONDAY THROUGH TUESDAY...Partly cloudy. Highs 64 to 69. Lows around
55.
.TUESDAY NIGHT AND WEDNESDAY...Partly cloudy. Lows around 58. Highs
66 to 71.

&&


$$