August weather forecast and climate
Isle Royale National Park, MI

Calm evening waters at the Rock Harbor in Isle Royale National Park, Michigan
Calm evening waters at the Rock Harbor in Isle Royale National Park, Michigan
August is a warm summer month in Isle Royale National Park that receives 8 hours of brilliant sunshine every day. The rainfall is to the tune of 3" (76.2mm), with sudden thunderstorms being the flavor of the month.
The average temperatures are in the 51.1°F (10.6°C) to 72°F (22.2°C) zone, but it is rare for days to cross 80.1°F (26.7°C). The lake waters are at their warmest of the year at 55°F (12.8°C).
Pack warm clothes as well as rain gear for camping purposes. Lucky tourists may sight a full-grown moose swimming in the lake waters.
Average temperature in August - Isle Royale National Park, MI
  • Average high temperature in August: 72°F

The warmest month (with the highest average high temperature) is July (75°F).
The month with the lowest average high temperature is January (18°F).

  • Average low temperature in August: 52°F

The month with the highest average low temperature is July (54°F).
The coldest month (with the lowest average low temperature) is January (0°F).

Average rainfall in August - Isle Royale National Park, MI
  • Average rainfall in August: 3.3"

The wettest month (with the highest rainfall) is September (3.4").
The driest month (with the lowest rainfall) is February (1.5").

Average rainfall days in August - Isle Royale National Park, MI
  • Average rainfall days in August: 12 days

Months with the highest number of rainy days are June and September (13 days).
Months with the lowest number of rainy days are February and April (8 days).

Average sea temperature in August - Isle Royale National Park, MI
  • Average sea temperature in August: 55°F

The best month for swimming (with the highest average sea temperature) is August (55°F).
Coldest months (with the lowest average sea temperature) are January, February, March and April (36°F).

Average daylight in August / Average sunshine in August - Isle Royale National Park, MI
  • Average daylight in August: 14.2h

The month with the longest days is June (Average daylight: 16h).
The month with shortest days is December (Average daylight: 8.5h).

  • Average sunshine in August: 8h

The month with most sunshine is July (Average sunshine: 10h).
Months with least sunshine are November and December (Average sunshine: 3).

Average UV index in August - Isle Royale National Park, MI
  • Average UV index in August: 6

Months with the highest UV index are June and July (UV index 7).
Months with the lowest UV index are January, February, November and December (UV index 1).

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