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MIZ001-202000-
Recreational Forecast for Isle Royale National Park
National Weather Service Marquette MI
501 AM EDT Thu Aug 20 2026

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

.TODAY...Mostly cloudy. A chance of rain showers by late morning.
Rain showers likely by mid afternoon. Highs around 63 at the shore
and 67 to 72 inland. Southeast winds up to 10 mph. Waves calm to
1 foot.
.TONIGHT...A 40 percent chance of rain showers through midnight.
Mostly cloudy. Lows 57 to 62. East winds 5 to 10 mph becoming
northeast late. Waves calm to 1 foot.
.FRIDAY...Partly sunny. Highs around 66 at the shore and 69 to
74 inland. North winds up to 10 mph becoming west late. Waves calm
to 1 foot.
.FRIDAY NIGHT...Partly cloudy through midnight, then mostly cloudy
with a 20 percent chance of rain showers late. Lows around 59.
Southwest winds up to 10 mph becoming northwest late. Waves building
to 1 to 2 feet.
.SATURDAY...Mostly sunny with a 20 percent chance of rain showers.
Highs around 67 at the shore and 70 to 75 inland. Northwest winds
5 to 15 mph. Waves subsiding to calm to 1 foot.
.SATURDAY NIGHT THROUGH MONDAY...Mostly clear. Lows around 57. Highs
around 65 at the shore and 71 to 76 inland.
.MONDAY NIGHT...Mostly cloudy. Lows around 60.
.TUESDAY...A chance of rain showers. Partly sunny. Highs around
66 at the shore and 72 to 77 inland. Chance of showers 50 percent.
.TUESDAY NIGHT...A chance of rain showers through midnight. Mostly
cloudy. Lows around 59. Chance of showers 30 percent.
.WEDNESDAY...Partly cloudy. Highs around 65 at the shore and 71 to
76 inland.

&&

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

.TODAY...Mostly cloudy. Patchy fog early. A slight chance of rain
showers by late morning. A chance of rain showers by early
afternoon, then rain showers likely late. Highs around 61 at the
shore and 64 to 69 inland. Southeast winds up to 10 mph becoming
5 to 10 mph late. Waves calm to 1 foot.
.TONIGHT...A 40 percent chance of rain showers through midnight.
Mostly cloudy. Lows 57 to 62 inland and around 55 at the shore.
Southeast winds 5 to 15 mph becoming northeast 5 to 10 mph late.
Waves building to 1 to 2 feet.
.FRIDAY...Partly sunny. Highs around 61 at the shore and 66 to
71 inland. Northeast winds up to 10 mph becoming northwest late.
Waves subsiding to calm to 1 foot.
.FRIDAY NIGHT...Partly cloudy through midnight, then mostly cloudy
with a 20 percent chance of rain showers late. Lows around 58. West
winds up to 10 mph becoming northwest late. Waves calm to 1 foot.
.SATURDAY...A 20 percent chance of rain showers through early
afternoon. Mostly sunny. Highs around 63 at the shore and 67 to
72 inland. Northwest winds 5 to 15 mph. Waves calm to 1 foot.
.SATURDAY NIGHT THROUGH MONDAY...Mostly clear. Lows 54 to 59. Highs
around 61 at the shore and 70 to 75 inland.
.MONDAY NIGHT...Mostly cloudy. Lows 56 to 61.
.TUESDAY AND TUESDAY NIGHT...A chance of rain showers. Mostly
cloudy. Highs around 61 at the shore and 69 to 74 inland. Lows 55 to
60. Chance of showers 40 percent.
.WEDNESDAY...Partly cloudy. Highs around 60 at the shore and 69 to
74 inland.

&&

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

.TODAY...Mostly cloudy. A slight chance of rain showers by late
morning. A chance of rain showers by early afternoon, then rain
showers likely late. Highs around 64 at the shore and 67 to
72 inland. Southeast winds up to 10 mph. Waves calm to 1 foot.
.TONIGHT...A 40 percent chance of rain showers through midnight.
Mostly cloudy. Lows 57 to 62. Southeast winds 5 to 15 mph becoming
northeast 5 to 10 mph late. Waves building to 1 to 2 feet.
.FRIDAY...Partly cloudy. Highs around 65 at the shore and 69 to
74 inland. Northeast winds up to 10 mph becoming northwest late.
Waves subsiding to calm to 1 foot.
.FRIDAY NIGHT...Partly cloudy through midnight, then mostly cloudy
with a 20 percent chance of rain showers and thunderstorms late.
Lows around 59. Southwest winds 5 to 10 mph becoming northwest 5 to
15 mph late. Waves building to 1 to 2 feet.
.SATURDAY...Mostly sunny. Highs around 66 at the shore and 70 to
75 inland. Northwest winds 5 to 15 mph. Waves subsiding to calm to
1 foot.
.SATURDAY NIGHT THROUGH MONDAY...Mostly clear. Lows around 57. Highs
around 64 at the shore and 71 to 76 inland.
.MONDAY NIGHT...Partly cloudy through midnight then becoming mostly
cloudy. Lows around 60.
.TUESDAY AND TUESDAY NIGHT...A chance of rain showers. Mostly
cloudy. Highs around 65 at the shore and 72 to 77 inland. Lows
around 59. Chance of showers 40 percent.
.WEDNESDAY...Partly cloudy. Highs around 65 at the shore and 71 to
76 inland.

&&

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

.TODAY...A chance of rain showers by late morning. Rain showers
likely by mid afternoon. Mostly cloudy. Highs around 63 at the shore
and 66 to 71 inland. Southwest winds up to 5 mph becoming southeast
by mid afternoon. Waves calm to 1 foot.
.TONIGHT...A 40 percent chance of rain showers through midnight.
Mostly cloudy. Lows 57 to 62 inland and around 55 at the shore. East
winds 5 to 10 mph becoming northeast late. Waves calm to 1 foot.
.FRIDAY...Partly sunny. Highs around 64 at the shore and 68 to
73 inland. North winds up to 10 mph becoming northwest late. Waves
calm to 1 foot.
.FRIDAY NIGHT...A 20 percent chance of rain showers late. Mostly
cloudy. Lows 55 to 60. Southwest winds up to 10 mph becoming
northwest late. Waves calm to 1 foot.
.SATURDAY...A 20 percent chance of rain showers through early
afternoon. Mostly sunny. Highs around 66 at the shore and 69 to
74 inland. Northwest winds 5 to 15 mph. Waves calm to 1 foot.
.SATURDAY NIGHT AND SUNDAY...Mostly clear. Lows 54 to 59. Highs
around 63 at the shore and 67 to 72 inland.
.SUNDAY NIGHT AND MONDAY...Partly cloudy. Lows 54 to 59. Highs
around 62 at the shore and 71 to 76 inland.
.MONDAY NIGHT...Mostly cloudy. Lows 56 to 61.
.TUESDAY...A chance of rain showers. Partly sunny. Highs around
63 at the shore and 72 to 77 inland. Chance of showers 50 percent.
.TUESDAY NIGHT...A chance of rain showers through midnight. Mostly
cloudy. Lows 56 to 61. Chance of showers 40 percent.
.WEDNESDAY...Partly cloudy. Highs around 62 at the shore and 71 to
76 inland.

&&


$$