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MIZ001-190800-
Recreational Forecast for Isle Royale National Park
National Weather Service Marquette MI
501 PM EDT Sat Oct 18 2025

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

.TONIGHT...A 20 percent chance of rain showers by midnight. Mostly
cloudy. Lows around 47. West winds 5 to 15 mph becoming northwest
10 to 15 mph late. Waves 1 to 2 feet subsiding to calm to 1 foot
building to 1 to 2 feet.
.SUNDAY...Cooler. Partly cloudy. Highs around 50. Northwest winds
10 to 20 mph. Waves building to 2 to 3 feet.
.SUNDAY NIGHT...Mostly clear. Lows around 43. Northwest winds 5 to
15 mph. Waves subsiding to calm to 1 foot.
.MONDAY...A 30 percent chance of rain showers by mid afternoon.
Mostly cloudy. Highs around 54. Southwest winds up to 5 mph becoming
southeast 5 to 15 mph by late morning, then increasing to 10 to
20 mph late. Waves building to 1 to 2 feet.
.MONDAY NIGHT...Rain showers. Lows around 46. Southeast winds 10 to
20 mph. Chance of showers 90 percent. Waves building to 3 to 5 feet.
.TUESDAY...Breezy. Rain showers. Highs around 51. Chance of showers
80 percent.
.TUESDAY NIGHT...Breezy. Rain showers likely through midnight, then
a chance of rain showers late. Cloudy. Lows around 41. Chance of
showers 70 percent.
.WEDNESDAY...Mostly cloudy with a 50 percent chance of rain showers.
Highs 45 to 50.
.WEDNESDAY NIGHT...Mostly cloudy. Lows around 38.
.THURSDAY...Partly cloudy. Highs 46 to 51.
.THURSDAY NIGHT...Mostly cloudy. Lows around 41.
.FRIDAY THROUGH SATURDAY...Partly cloudy. Highs 51 to 56. Lows
around 43.

&&

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

.TONIGHT...A 20 percent chance of rain showers by midnight. Partly
cloudy early in the evening then becoming cloudy. Lows around 47.
West winds 5 to 15 mph becoming northwest 10 to 15 mph late. Waves
calm to 1 foot building to 1 to 2 feet.
.SUNDAY...Partly cloudy. Highs around 50. Northwest winds 10 to
20 mph. Waves building to 2 to 3 feet.
.SUNDAY NIGHT...Partly cloudy. Lows around 44. Northwest winds 5 to
15 mph. Waves subsiding to calm to 1 foot.
.MONDAY...Partly sunny through early afternoon, then cloudy with a
20 percent chance of rain showers by mid afternoon. Highs 51 to 56.
West winds up to 5 mph becoming south by late morning, then becoming
southeast 5 to 15 mph by mid afternoon. Waves building to 2 to
3 feet.
.MONDAY NIGHT...Rain showers. Lows around 46. Southeast winds 10 to
20 mph. Chance of showers 90 percent. Waves building to 5 to 8 feet.
.TUESDAY...Breezy. Rain showers. Highs 48 to 53. Chance of showers
80 percent.
.TUESDAY NIGHT...Breezy. Rain showers likely through midnight, then
a chance of rain showers late. Cloudy. Lows around 41. Chance of
showers 70 percent.
.WEDNESDAY...Mostly cloudy with a 50 percent chance of rain showers.
Highs 43 to 48.
.WEDNESDAY NIGHT AND THURSDAY...Mostly cloudy. Lows around 38. Highs
44 to 49.
.THURSDAY NIGHT THROUGH FRIDAY NIGHT...Mostly cloudy. Lows around
42. Highs 47 to 52.
.SATURDAY...Mostly sunny. Highs 49 to 54.

&&

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

.TONIGHT...A 20 percent chance of rain showers by midnight. Partly
cloudy early in the evening then becoming cloudy. Lows around 47.
West winds 5 to 15 mph becoming northwest 10 to 15 mph late. Waves
calm to 1 foot building to 1 to 2 feet.
.SUNDAY...Cooler. Partly cloudy. Highs around 50. Northwest winds
10 to 20 mph. Waves building to 2 to 3 feet.
.SUNDAY NIGHT...Partly cloudy. Lows around 44. Northwest winds 5 to
15 mph. Waves subsiding to calm to 1 foot.
.MONDAY...A 20 percent chance of rain showers by mid afternoon.
Mostly cloudy. Highs 52 to 57. West winds 5 to 10 mph becoming
southeast 5 to 15 mph by mid afternoon. Waves building to 1 to
2 feet.
.MONDAY NIGHT...Rain showers. Lows around 46. Southeast winds 10 to
20 mph. Chance of showers 90 percent. Waves building to 3 to 6 feet.
.TUESDAY...Breezy. Rain showers. Highs 49 to 54. Chance of showers
80 percent.
.TUESDAY NIGHT...Breezy. Rain showers likely through midnight, then
a chance of rain showers late. Cloudy. Lows around 41. Chance of
showers 70 percent.
.WEDNESDAY...Breezy. Mostly cloudy with a 50 percent chance of rain
showers. Highs 44 to 49.
.WEDNESDAY NIGHT AND THURSDAY...Mostly cloudy. Lows around 38. Highs
around 46 at the shore and 48 to 53 inland.
.THURSDAY NIGHT...Mostly cloudy. Lows around 41.
.FRIDAY...Partly cloudy. Highs around 49 at the shore and 51 to
56 inland.
.FRIDAY NIGHT...Partly cloudy through midnight then becoming mostly
cloudy. Lows around 43.
.SATURDAY...Mostly sunny. Highs around 51 at the shore and 53 to
58 inland.

&&

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

.TONIGHT...A 20 percent chance of rain showers by midnight. Mostly
cloudy. Lows around 46. West winds 5 to 15 mph becoming northwest
late. Waves 1 to 2 feet subsiding to calm to 1 foot.
.SUNDAY...Cooler. Partly cloudy. Highs around 50. Northwest winds
5 to 15 mph increasing to 10 to 20 mph by mid afternoon. Waves
building to 1 to 2 feet.
.SUNDAY NIGHT...Partly cloudy. Lows around 43. Northwest winds 5 to
15 mph. Waves subsiding to calm to 1 foot.
.MONDAY...Partly sunny through early afternoon, then cloudy with a
30 percent chance of rain showers by mid afternoon. Highs 52 to 57.
Southwest winds up to 5 mph becoming south by late morning, then
becoming southeast 5 to 15 mph by mid afternoon. Waves building to
2 to 3 feet.
.MONDAY NIGHT...Rain showers. Lows around 45. Southeast winds 10 to
20 mph. Chance of showers 90 percent. Waves building to 3 to 6 feet.
.TUESDAY...Rain showers. Highs 48 to 53. Chance of showers
80 percent.
.TUESDAY NIGHT...Rain showers likely through midnight, then a chance
of rain showers late. Cloudy. Lows around 40. Chance of showers
70 percent.
.WEDNESDAY...Mostly cloudy with a 50 percent chance of rain showers.
Highs 43 to 48.
.WEDNESDAY NIGHT AND THURSDAY...Mostly cloudy. Lows around 38. Highs
45 to 50.
.THURSDAY NIGHT...Mostly cloudy. Lows around 41.
.FRIDAY...Partly cloudy. Highs 48 to 53.
.FRIDAY NIGHT...Partly cloudy through midnight then becoming mostly
cloudy. Lows around 43.
.SATURDAY...Mostly sunny. Highs 50 to 55.

&&


$$