SXUS43 KMQT 182105 RECMQT MIZ001-190800- Recreational Forecast for Isle Royale National Park National Weather Service Marquette MI 505 PM EDT Mon May 18 2026 Isle Royale (SW areas)- Including Greenstone Ridge South, Little Todd Harbor, Minong Ridge, and Windigo- .TONIGHT...Breezy. Rain showers likely through midnight. A slight chance of thunderstorms. Rain showers late. Patchy fog by midnight. Lows around 39. Northeast winds 10 to 20 mph. Waves 1 to 2 feet building to 3 to 5 feet. .TUESDAY...Cool. A 40 percent chance of rain showers through early afternoon. Patchy fog through early afternoon. Cloudy. Highs 43 to 48. North winds 10 to 20 mph becoming northwest 10 to 15 mph by late morning. Waves subsiding to 1 to 2 feet. .TUESDAY NIGHT...Mostly cloudy through midnight then becoming partly cloudy. Lows around 36. Northwest winds 10 to 15 mph. Waves building to 2 to 3 feet subsiding to calm to 1 foot. .WEDNESDAY...Sunny. Highs around 43 at the shore and 48 to 53 inland. Northwest winds 5 to 10 mph becoming southwest 5 to 15 mph by mid afternoon. Waves building to 1 to 2 feet. .WEDNESDAY NIGHT...Mostly clear. Lows around 38. South winds 5 to 15 mph. Waves subsiding to calm to 1 foot. .THURSDAY AND THURSDAY NIGHT...Partly cloudy. Highs around 49 at the shore and 55 to 60 inland. Lows around 40. .FRIDAY AND FRIDAY NIGHT...Mostly cloudy. Highs around 49 at the shore and 54 to 59 inland. Lows around 40. .SATURDAY...A chance of rain showers through early afternoon. Mostly cloudy. Highs around 49 at the shore and 54 to 59 inland. Chance of showers 30 percent. .SATURDAY NIGHT THROUGH SUNDAY NIGHT...Mostly cloudy. Lows around 42. Highs around 51 at the shore and 57 to 62 inland. .MEMORIAL DAY...Partly sunny. Highs around 55 at the shore and 62 to 67 inland. && Isle Royale (NE areas)- Including Greenstone Ridge North, Malone Bay, Mount Saginaw, and Rock Harbor- .TONIGHT...Breezy. Patchy fog. Rain showers likely by midnight. A slight chance of thunderstorms by midnight. Rain showers late. Lows around 37. Northeast winds 10 to 20 mph. Waves 2 to 3 feet building to 3 to 6 feet. .TUESDAY...Breezy, cool. A 20 percent chance of rain showers through early afternoon. Patchy fog through early afternoon. Mostly cloudy. Highs 40 to 45. North winds 15 to 25 mph becoming northwest 10 to 20 mph by late morning. Waves subsiding to 2 to 3 feet. .TUESDAY NIGHT...Mostly cloudy through midnight then clearing. Lows around 35. Northwest winds 10 to 20 mph. Waves subsiding to 1 to 2 feet. .WEDNESDAY...Cool, sunny. Highs around 41 at the shore and 43 to 48 inland. Northwest winds 5 to 15 mph becoming southwest by mid afternoon. Waves subsiding to calm to 1 foot building to 1 to 2 feet. .WEDNESDAY NIGHT...Mostly clear. Lows around 38. South winds 5 to 15 mph. Waves subsiding to calm to 1 foot. .THURSDAY...Warmer, sunny. Highs around 45 at the shore and 49 to 54 inland. .THURSDAY NIGHT...Partly cloudy. Lows around 39. .FRIDAY AND FRIDAY NIGHT...Cool. Mostly cloudy. Highs around 44 at the shore and 48 to 53 inland. Lows around 39. .SATURDAY...Cloudy with a chance of rain showers through early afternoon, then partly sunny by mid afternoon. Highs around 43 at the shore and 49 to 54 inland. Chance of showers 30 percent. .SATURDAY NIGHT THROUGH SUNDAY NIGHT...Mostly cloudy. Lows around 41. Highs around 44 at the shore and 52 to 57 inland. .MEMORIAL DAY...Partly sunny. Highs around 48 at the shore and 56 to 61 inland. && Isle Royale (NW areas)- Including Amygdaloid Island, Lookout Louise, and Minong Mine- .TONIGHT...Breezy. Patchy fog by midnight. Rain showers likely by midnight. A slight chance of thunderstorms by midnight. Rain showers late. Lows around 38. Northeast winds 10 to 20 mph. Waves 2 to 3 feet building to 3 to 5 feet. .TUESDAY...Breezy, cool. A 20 percent chance of rain showers through early afternoon. Patchy fog through early afternoon. Cloudy. Highs 41 to 46. North winds 15 to 25 mph becoming northwest 15 to 20 mph by late morning. Waves subsiding to 2 to 3 feet. .TUESDAY NIGHT...Mostly cloudy through midnight then clearing. Lows around 35. Northwest winds 10 to 20 mph. Waves subsiding to 1 to 2 feet. .WEDNESDAY...Cool, sunny. Highs around 44 at the shore and 46 to 51 inland. Northwest winds 5 to 15 mph becoming southwest by mid afternoon. Waves subsiding to calm to 1 foot building to 1 to 2 feet. .WEDNESDAY NIGHT...Mostly clear. Lows around 38. South winds 5 to 15 mph. Waves subsiding to calm to 1 foot. .THURSDAY...Warmer, sunny. Highs around 47 at the shore and 53 to 58 inland. .THURSDAY NIGHT...Partly cloudy. Lows around 40. .FRIDAY AND FRIDAY NIGHT...Mostly cloudy. Highs around 45 at the shore and 51 to 56 inland. Lows around 39. .SATURDAY...Mostly cloudy with a 30 percent chance of rain showers. Highs around 47 at the shore and 51 to 56 inland. .SATURDAY NIGHT THROUGH SUNDAY NIGHT...Mostly cloudy. Lows around 41. Highs around 49 at the shore and 55 to 60 inland. .MEMORIAL DAY...Partly sunny. Highs around 52 at the shore and 59 to 64 inland. && Isle Royale (SE areas)- Including Feldtman Ridge, Rainbow Cove, and Siskiwit Bay- .TONIGHT...Breezy. Patchy fog. Rain showers likely through midnight. A slight chance of thunderstorms. Rain showers late. Lows around 39. Northeast winds 10 to 20 mph. Waves 2 to 3 feet subsiding to 1 to 2 feet building to 3 to 5 feet. .TUESDAY...Cool. A 50 percent chance of rain showers through early afternoon. Patchy fog through early afternoon. Cloudy. Highs around 42 at the shore and 44 to 49 inland. North winds 10 to 20 mph becoming northwest 10 to 15 mph by late morning. Waves subsiding to 1 to 2 feet. .TUESDAY NIGHT...Mostly cloudy through midnight then becoming partly cloudy. Areas of frost late. Lows around 36. Northwest winds 10 to 15 mph. Waves subsiding to calm to 1 foot. .WEDNESDAY...Sunny. Highs around 43 at the shore and 46 to 51 inland. Northwest winds 5 to 10 mph becoming southwest 5 to 15 mph by mid afternoon. Waves building to 1 to 2 feet. .WEDNESDAY NIGHT...Mostly clear. Lows around 39. South winds up to 10 mph. Waves subsiding to calm to 1 foot. .THURSDAY...Warmer, sunny. Highs around 48 at the shore and 55 to 60 inland. .THURSDAY NIGHT...Partly cloudy. Lows around 40. .FRIDAY AND FRIDAY NIGHT...Mostly cloudy. Highs around 47 at the shore and 53 to 58 inland. Lows around 40. .SATURDAY...A chance of rain showers through early afternoon. Mostly cloudy. Highs around 46 at the shore and 52 to 57 inland. Chance of showers 30 percent. .SATURDAY NIGHT THROUGH SUNDAY NIGHT...Mostly cloudy. Lows around 42. Highs around 48 at the shore and 56 to 61 inland. .MEMORIAL DAY...Partly sunny. Highs around 51 at the shore and 61 to 66 inland. && $$