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MIZ001-212000-
Recreational Forecast for Isle Royale National Park
National Weather Service Marquette MI
501 AM EDT Thu Aug 21 2025

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

.TODAY...Partly cloudy. Highs around 68. Southwest winds 5 to
10 mph. Waves calm to 1 foot.
.TONIGHT...A slight chance of showers and thunderstorms through
midnight, then a chance of showers and thunderstorms late. Mostly
cloudy. Lows around 62. South winds 5 to 10 mph becoming southwest
5 to 15 mph late. Chance of precipitation 30 percent. Waves building
to 1 to 2 feet.
.FRIDAY...Warmer. A chance of showers and thunderstorms through
early afternoon, then a slight chance of showers and thunderstorms
by mid afternoon. Partly cloudy. Highs around 69 at the shore and
74 to 79 inland. Southwest winds 10 to 15 mph. Chance of
precipitation 30 percent. Waves building to 2 to 3 feet.
.FRIDAY NIGHT...Mostly clear. Lows around 59. West winds 10 to
15 mph. Waves subsiding to 1 to 2 feet.
.SATURDAY...A 20 percent chance of rain showers by mid afternoon.
Mostly sunny. Highs around 67. West winds 10 to 15 mph. Waves
building to 2 to 3 feet.
.SATURDAY NIGHT AND SUNDAY...Mostly cloudy. Lows around 56. Highs
around 61.
.SUNDAY NIGHT...Mostly cloudy. Lows around 52.
.MONDAY...Partly cloudy. Highs around 63.
.MONDAY NIGHT AND TUESDAY...Mostly clear. Lows around 53. Highs
around 67.
.TUESDAY NIGHT AND WEDNESDAY...Partly cloudy. Lows around 57. Highs
67 to 72.

&&

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

.TODAY...Partly sunny. Highs around 67. Southwest winds 5 to 10 mph
becoming south late. Waves calm to 1 foot.
.TONIGHT...A slight chance of showers and thunderstorms through
midnight, then a chance of showers and thunderstorms late. Mostly
cloudy. Lows around 61. South winds 5 to 15 mph becoming southwest
late. Chance of precipitation 40 percent. Waves building to 1 to
2 feet.
.FRIDAY...A chance of showers and thunderstorms through early
afternoon, then a slight chance of showers and thunderstorms by mid
afternoon. Mostly sunny. Highs around 68 at the shore and 72 to
77 inland. Southwest winds 10 to 15 mph. Chance of precipitation
30 percent. Waves 1 to 2 feet.
.FRIDAY NIGHT...Partly cloudy. Lows around 60. West winds 10 to
15 mph. Waves 1 to 2 feet.
.SATURDAY...A 20 percent chance of showers by mid afternoon. Mostly
sunny. Highs around 65. West winds 10 to 15 mph. Waves 1 to 2 feet.
.SATURDAY NIGHT AND SUNDAY...Mostly cloudy. Lows around 56. Highs
around 60.
.SUNDAY NIGHT AND MONDAY...Breezy. Mostly cloudy. Lows around 53.
Highs around 61.
.MONDAY NIGHT...Partly cloudy. Lows around 54.
.TUESDAY...Sunny. Highs around 65.
.TUESDAY NIGHT AND WEDNESDAY...Partly cloudy. Lows around 58. Highs
around 67.

&&

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

.TODAY...Partly sunny. Highs around 68. Southwest winds 5 to 10 mph
becoming south late. Waves calm to 1 foot.
.TONIGHT...A slight chance of showers and thunderstorms through
midnight, then a chance of showers and thunderstorms late. Mostly
cloudy. Lows around 61. South winds 5 to 15 mph becoming southwest
late. Chance of precipitation 30 percent. 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. Mostly sunny. Highs around 68 at the shore and 72 to
77 inland. Southwest winds 10 to 15 mph. Chance of precipitation
30 percent. Waves building to 1 to 2 feet subsiding to calm to
1 foot.
.FRIDAY NIGHT...Partly cloudy. Lows around 60. West winds 10 to
15 mph. Waves 1 to 2 feet.
.SATURDAY...A 20 percent chance of showers by mid afternoon. Mostly
sunny. Highs around 66. West winds 10 to 20 mph. Waves 1 to 2 feet.
.SATURDAY NIGHT AND SUNDAY...Mostly cloudy. Lows around 56. Highs
around 60.
.SUNDAY NIGHT...Breezy. Mostly cloudy. Lows around 53.
.MONDAY AND MONDAY NIGHT...Partly cloudy. Highs around 62. Lows
around 53.
.TUESDAY...Sunny. Highs around 66.
.TUESDAY NIGHT AND WEDNESDAY...Partly cloudy. Lows around 57. Highs
65 to 70.

&&

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

.TODAY...Partly cloudy. Highs around 68. Southwest winds 5 to 10 mph
becoming south late. Waves calm to 1 foot.
.TONIGHT...A slight chance of showers and thunderstorms through
midnight, then a chance of showers and thunderstorms late. Mostly
cloudy. Lows around 62. South winds 5 to 10 mph becoming southwest
5 to 15 mph late. Chance of precipitation 30 percent. Waves building
to 1 to 2 feet.
.FRIDAY...Warmer. A chance of showers and thunderstorms through
early afternoon, then a slight chance of showers and thunderstorms
by mid afternoon. Partly cloudy. Highs around 71 at the shore and
74 to 79 inland. 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...A 20 percent chance of showers by mid afternoon. Mostly
sunny. Highs around 67. West winds 10 to 20 mph. Waves building to
2 to 3 feet.
.SATURDAY NIGHT AND SUNDAY...Mostly cloudy. Lows around 56. Highs
around 61.
.SUNDAY NIGHT...Mostly cloudy. Lows around 53.
.MONDAY AND MONDAY NIGHT...Partly cloudy. Highs around 63. Lows
around 54.
.TUESDAY...Sunny. Highs around 66.
.TUESDAY NIGHT AND WEDNESDAY...Partly cloudy. Lows around 57. Highs
66 to 71.

&&


$$