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MIZ001-220800-
Recreational Forecast for Isle Royale National Park
National Weather Service Marquette MI
500 PM EDT Fri Aug 21 2026

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

.TONIGHT...Partly cloudy early in the evening, then mostly cloudy
with a 20 percent chance of rain showers and thunderstorms by
midnight. Mostly cloudy late. Lows around 59. Southwest winds 5 to
10 mph becoming northwest 5 to 15 mph late. Waves calm to 1 foot
building to 1 to 2 feet.
.SATURDAY...Mostly 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 56. North winds 5 to
15 mph. Waves building to 2 to 3 feet.
.SUNDAY...Sunny. Highs around 62 at the shore and 66 to 71 inland.
North winds up to 10 mph becoming west late. Waves subsiding to calm
to 1 foot.
.SUNDAY NIGHT...Mostly clear. Lows around 56. West winds 5 to 10 mph
becoming northwest late. Waves calm to 1 foot.
.MONDAY...Sunny. Highs around 66 at the shore and 68 to 73 inland.
.MONDAY NIGHT...Partly cloudy through midnight then becoming mostly
cloudy. Lows around 58.
.TUESDAY...A chance of rain showers by mid afternoon. Partly sunny.
Highs around 66 at the shore and 71 to 76 inland. Chance of showers
40 percent.
.TUESDAY NIGHT...Rain showers likely and a chance of thunderstorms
through midnight, then a chance of rain showers late. Mostly cloudy.
Lows around 60. Chance of precipitation 60 percent.
.WEDNESDAY...A chance of rain showers. Partly sunny. Highs around
66 at the shore and 71 to 76 inland. Chance of showers 40 percent.
.WEDNESDAY NIGHT...Mostly cloudy through midnight then becoming
partly cloudy. Lows around 59.
.THURSDAY THROUGH FRIDAY...Partly cloudy. Highs around 66 at the
shore and 71 to 76 inland. Lows around 58.

&&

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

.TONIGHT...Partly cloudy then becoming mostly cloudy late then
becoming partly cloudy. Lows around 58. West winds 5 to 10 mph
becoming northwest late. Waves calm to 1 foot.
.SATURDAY...Mostly 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...Mostly clear. Lows around 55. North winds 5 to
15 mph. Waves building to 2 to 3 feet.
.SUNDAY...Sunny. Highs around 60 at the shore and 62 to 67 inland.
North winds up to 10 mph becoming northwest late. Waves subsiding to
calm to 1 foot.
.SUNDAY NIGHT...Mostly clear. Lows around 55. West winds 5 to 10 mph
becoming northwest late. Waves calm to 1 foot.
.MONDAY...Sunny. Highs around 62 at the shore and 64 to 69 inland.
.MONDAY NIGHT...Mostly cloudy. Lows around 57.
.TUESDAY...A chance of rain showers by mid afternoon. Partly sunny.
Highs around 60 at the shore and 68 to 73 inland. Chance of showers
40 percent.
.TUESDAY NIGHT...Rain showers likely and a chance of thunderstorms
through midnight, then a chance of rain showers late. Mostly cloudy.
Lows 56 to 61. Chance of precipitation 60 percent.
.WEDNESDAY...A chance of rain showers through early afternoon.
Partly sunny. Highs around 61 at the shore and 69 to 74 inland.
Chance of showers 40 percent.
.WEDNESDAY NIGHT...Mostly cloudy through midnight then becoming
partly cloudy. Lows around 58.
.THURSDAY THROUGH FRIDAY...Partly cloudy. Highs around 61 at the
shore and 69 to 74 inland. Lows 55 to 60.

&&

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

.TONIGHT...Partly cloudy through midnight then becoming mostly
cloudy. Lows around 60. West winds 5 to 10 mph becoming northwest
5 to 15 mph late. Waves calm to 1 foot building to 1 to 2 feet.
.SATURDAY...Mostly 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, then building to 1 to 2 feet.
.SATURDAY NIGHT...Mostly clear. Lows around 57. North winds 5 to
15 mph. Waves building to 2 to 3 feet.
.SUNDAY...Sunny. Highs around 61 at the shore and 65 to 70 inland.
North winds 5 to 15 mph becoming northwest 5 to 10 mph late. Waves
subsiding to calm to 1 foot.
.SUNDAY NIGHT...Mostly clear. Lows around 57. West winds 5 to 10 mph
becoming northwest late. Waves calm to 1 foot.
.MONDAY...Sunny. Highs 66 to 71.
.MONDAY NIGHT...Partly cloudy through midnight then becoming mostly
cloudy. Lows around 58.
.TUESDAY...A chance of rain showers by mid afternoon. Partly sunny.
Highs around 64 at the shore and 70 to 75 inland. Chance of showers
40 percent.
.TUESDAY NIGHT...A chance of rain showers and thunderstorms through
midnight, then a chance of rain showers late. Mostly cloudy. Lows
around 60. Chance of precipitation 50 percent.
.WEDNESDAY...A chance of rain showers. Partly sunny. Highs around
65 at the shore and 71 to 76 inland. Chance of showers 40 percent.
.WEDNESDAY NIGHT...Mostly cloudy through midnight then becoming
partly cloudy. Lows around 59.
.THURSDAY THROUGH FRIDAY...Partly cloudy. Highs around 65 at the
shore and 71 to 76 inland. Lows around 58.

&&

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

.TONIGHT...Partly cloudy early in the evening, then mostly cloudy
with a 20 percent chance of rain showers and thunderstorms by
midnight. Mostly cloudy late. Lows 56 to 61. West winds 5 to 10 mph
becoming northwest 5 to 15 mph late. Waves calm to 1 foot.
.SATURDAY...Sunny. Highs around 65 at the shore and 68 to 73 inland.
Northwest winds 5 to 15 mph. Waves calm to 1 foot.
.SATURDAY NIGHT...Mostly clear. Lows around 55. North winds 5 to
15 mph. Waves calm to 1 foot.
.SUNDAY...Sunny. Highs around 59 at the shore and 64 to 69 inland.
North winds 5 to 15 mph becoming west 5 to 10 mph late. Waves calm
to 1 foot.
.SUNDAY NIGHT...Mostly clear. Lows around 55. West winds up to
10 mph becoming northwest late. Waves calm to 1 foot.
.MONDAY...Sunny. Highs around 63 at the shore and 66 to 71 inland.
.MONDAY NIGHT...Mostly cloudy. Lows 55 to 60.
.TUESDAY...A chance of rain showers by mid afternoon. Partly sunny.
Highs around 63 at the shore and 70 to 75 inland. Chance of showers
40 percent.
.TUESDAY NIGHT...Rain showers likely and a chance of thunderstorms
through midnight, then a chance of rain showers late. Mostly cloudy.
Lows 56 to 61. Chance of precipitation 60 percent.
.WEDNESDAY...A chance of rain showers. Partly sunny. Highs around
62 at the shore and 71 to 76 inland. Chance of showers 30 percent.
.WEDNESDAY NIGHT...Mostly cloudy through midnight then becoming
partly cloudy. Lows 56 to 61.
.THURSDAY THROUGH FRIDAY...Partly cloudy. Highs around 62 at the
shore and 71 to 76 inland. Lows 55 to 60.

&&


$$