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MIZ001-212000-
Recreational Forecast for Isle Royale National Park
National Weather Service Marquette MI
500 AM EDT Fri Aug 21 2026

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

.TODAY...Patchy fog early. Mostly cloudy through mid afternoon, then
partly cloudy with a 20 percent chance of rain showers late. Highs
around 66 at the shore and 69 to 74 inland. Northeast winds up to
5 mph becoming north by late morning, then becoming west late. Waves
calm to 1 foot.
.TONIGHT...A 20 percent chance of rain showers late. Partly cloudy.
Lows around 58. Southwest winds 5 to 10 mph becoming northwest 5 to
15 mph late. Waves building to 1 to 2 feet.
.SATURDAY...Sunny. Highs around 68 at the shore and 70 to 75 inland.
Northwest winds 5 to 15 mph. Waves subsiding to calm to 1 foot.
.SATURDAY NIGHT...Mostly clear. Lows around 54. North winds 5 to
15 mph. Waves building to 1 to 2 feet.
.SUNDAY...Sunny. Highs around 64 at the shore and 68 to 73 inland.
North winds up to 10 mph becoming southwest late. Waves subsiding to
calm to 1 foot.
.SUNDAY NIGHT AND MONDAY...Mostly clear. Lows around 53. Highs
around 66 at the shore and 68 to 73 inland.
.MONDAY NIGHT...Partly cloudy through midnight then becoming mostly
cloudy. Lows 59 to 64.
.TUESDAY...A chance of rain showers by mid afternoon. Partly sunny.
Highs around 67 at the shore and 73 to 78 inland. Chance of showers
40 percent.
.TUESDAY NIGHT...Mostly cloudy with a 50 percent chance of rain
showers. Lows 59 to 64.
.WEDNESDAY...Partly sunny with a 30 percent chance of rain showers.
Highs around 67 at the shore and 73 to 78 inland.
.WEDNESDAY NIGHT AND THURSDAY...Partly cloudy. Lows 58 to 63. Highs
around 66 at the shore and around 73 inland.

&&

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

.TODAY...Mostly cloudy through mid afternoon then becoming partly
cloudy. Patchy fog early. Highs around 62 at the shore and 65 to
70 inland. East winds up to 5 mph becoming west late. Waves 1 to
2 feet subsiding to calm to 1 foot.
.TONIGHT...Partly cloudy. Lows around 57. Southwest winds up to
10 mph becoming northwest late. Waves calm to 1 foot.
.SATURDAY...Sunny. Highs around 64 at the shore and 66 to 71 inland.
Northwest winds 5 to 15 mph. Waves building to 1 to 2 feet subsiding
to calm to 1 foot.
.SATURDAY NIGHT...Partly cloudy. Lows around 54. North winds 5 to
15 mph. Waves building to 1 to 2 feet.
.SUNDAY...Sunny. Highs around 62 at the shore and 65 to 70 inland.
North winds up to 10 mph becoming west late. Waves subsiding to calm
to 1 foot.
.SUNDAY NIGHT AND MONDAY...Mostly clear. Lows around 54. Highs
around 62 at the shore and 65 to 70 inland.
.MONDAY NIGHT...Partly cloudy through midnight then becoming mostly
cloudy. Lows 57 to 62.
.TUESDAY...A chance of rain showers by mid afternoon. Partly sunny.
Highs around 62 at the shore and 70 to 75 inland. Chance of showers
30 percent.
.TUESDAY NIGHT...Rain showers likely through midnight, then a chance
of rain showers late. Mostly cloudy. Lows 57 to 62. Chance of
showers 60 percent.
.WEDNESDAY...A chance of rain showers through early afternoon.
Partly sunny. Highs around 62 at the shore and 70 to 75 inland.
Chance of showers 30 percent.
.WEDNESDAY NIGHT AND THURSDAY...Partly cloudy. Lows 56 to 61. Highs
around 61 at the shore and 67 to 72 inland.

&&

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

.TODAY...Partly sunny through mid afternoon then becoming mostly
sunny. Patchy fog through early afternoon. Highs around 65 at the
shore and 68 to 73 inland. East winds up to 5 mph becoming northwest
late. Waves calm to 1 foot building to 1 to 2 feet, then subsiding
to calm to 1 foot.
.TONIGHT...Partly cloudy. Lows around 58. West winds 5 to 10 mph
becoming northwest 5 to 15 mph late. Waves building to 1 to 2 feet.
.SATURDAY...Sunny. Highs around 66 at the shore and 69 to 74 inland.
Northwest winds 5 to 15 mph. Waves subsiding to calm to 1 foot.
.SATURDAY NIGHT...Mostly clear. Lows around 54. North winds 5 to
15 mph. Waves building to 1 to 2 feet.
.SUNDAY...Sunny. Highs around 64 at the shore and 68 to 73 inland.
North winds 5 to 15 mph becoming west 5 to 10 mph late. Waves
subsiding to calm to 1 foot.
.SUNDAY NIGHT AND MONDAY...Mostly clear. Lows around 54. Highs 66 to
71.
.MONDAY NIGHT...Partly cloudy through midnight then becoming mostly
cloudy. Lows 59 to 64.
.TUESDAY...A chance of rain showers by mid afternoon. Partly sunny.
Highs around 66 at the shore and 72 to 77 inland. Chance of showers
30 percent.
.TUESDAY NIGHT...Rain showers likely through midnight, then a chance
of rain showers late. Mostly cloudy. Lows 59 to 64. Chance of
showers 60 percent.
.WEDNESDAY...A chance of rain showers through early afternoon.
Partly sunny. Highs around 66 at the shore and 72 to 77 inland.
Chance of showers 30 percent.
.WEDNESDAY NIGHT AND THURSDAY...Partly cloudy. Lows 58 to 63. Highs
around 65 at the shore and 70 to 75 inland.

&&

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

.TODAY...Mostly cloudy through mid afternoon then becoming partly
cloudy. Patchy fog through early afternoon. Highs around 63 at the
shore and 68 to 73 inland. Northeast winds up to 5 mph increasing to
5 to 10 mph by late morning, then becoming north by early afternoon
becoming west late. Waves calm to 1 foot.
.TONIGHT...A 20 percent chance of rain showers late. Partly cloudy.
Lows around 57. West winds up to 10 mph becoming northwest late.
Waves calm to 1 foot.
.SATURDAY...Sunny. Highs around 65 at the shore and 69 to 74 inland.
Northwest winds 5 to 15 mph. Waves calm to 1 foot.
.SATURDAY NIGHT...Partly cloudy. Lows around 54. North winds 5 to
15 mph. Waves calm to 1 foot.
.SUNDAY...Sunny. Highs around 62 at the shore and 67 to 72 inland.
North winds 5 to 15 mph becoming northwest up to 5 mph by early
afternoon, then becoming southwest late. Waves calm to 1 foot.
.SUNDAY NIGHT AND MONDAY...Mostly clear. Lows around 53. Highs
around 63 at the shore and 67 to 72 inland.
.MONDAY NIGHT...Partly cloudy through midnight then becoming mostly
cloudy. Lows 59 to 64 inland and around 57 at the shore.
.TUESDAY...A chance of rain showers by mid afternoon. Partly sunny.
Highs around 64 at the shore and 71 to 76 inland. Chance of showers
30 percent.
.TUESDAY NIGHT...Mostly cloudy with a 50 percent chance of rain
showers. Lows 59 to 64 inland and around 57 at the shore.
.WEDNESDAY...A chance of rain showers through early afternoon.
Partly sunny. Highs around 64 at the shore and 71 to 76 inland.
Chance of showers 30 percent.
.WEDNESDAY NIGHT...Mostly cloudy. Lows 56 to 61.
.THURSDAY...Partly cloudy. Highs around 63 at the shore and 69 to
74 inland.

&&


$$