Isle Royale weather by month

Check out Isle Royale weather averages by month. Compare detailed monthly climate statistics including temperature, rainfall and sunshine figures.

Temperature in Isle Royale (°F)

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Max temperature (daytime)
18°F maximum daytime temperature in January in Isle Royale18
21°F maximum daytime temperature in February in Isle Royale21
32°F maximum daytime temperature in March in Isle Royale32
46°F maximum daytime temperature in April in Isle Royale46
59°F maximum daytime temperature in May in Isle Royale59
68°F maximum daytime temperature in June in Isle Royale68
75°F maximum daytime temperature in July in Isle Royale75
72°F maximum daytime temperature in August in Isle Royale72
63°F maximum daytime temperature in September in Isle Royale63
52°F maximum daytime temperature in October in Isle Royale52
36°F maximum daytime temperature in November in Isle Royale36
23°F maximum daytime temperature in December in Isle Royale23
Min temperature (night-time)
-0°F minimum night-time temperature in January in Isle Royale-0
1°F minimum night-time temperature in February in Isle Royale1
12°F minimum night-time temperature in March in Isle Royale12
27°F minimum night-time temperature in April in Isle Royale27
37°F minimum night-time temperature in May in Isle Royale37
46°F minimum night-time temperature in June in Isle Royale46
54°F minimum night-time temperature in July in Isle Royale54
52°F minimum night-time temperature in August in Isle Royale52
45°F minimum night-time temperature in September in Isle Royale45
36°F minimum night-time temperature in October in Isle Royale36
23°F minimum night-time temperature in November in Isle Royale23
7°F minimum night-time temperature in December in Isle Royale7
Heat & Humidity
No heat & humidity in January in Isle Royale0
No heat & humidity in February in Isle Royale0
No heat & humidity in March in Isle Royale0
No heat & humidity in April in Isle Royale0
No heat & humidity in May in Isle Royale0
No heat & humidity in June in Isle Royale0
No heat & humidity in July in Isle Royale0
No heat & humidity in August in Isle Royale0
No heat & humidity in September in Isle Royale0
No heat & humidity in October in Isle Royale0
No heat & humidity in November in Isle Royale0
No heat & humidity in December in Isle Royale0
Sea temperature
36°F sea temperature in January in Isle Royale36
36°F sea temperature in February in Isle Royale36
36°F sea temperature in March in Isle Royale36
36°F sea temperature in April in Isle Royale36
37°F sea temperature in May in Isle Royale37
37°F sea temperature in June in Isle Royale37
43°F sea temperature in July in Isle Royale43
55°F sea temperature in August in Isle Royale55
54°F sea temperature in September in Isle Royale54
46°F sea temperature in October in Isle Royale46
41°F sea temperature in November in Isle Royale41
39°F sea temperature in December in Isle Royale39

Note: 0 = None, L = Low, M = Moderate, H = High, VH = Very high, E = Extreme

Sunshine & Daylight in Isle Royale

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Daily hours of sunshine
Daily hours of daylight
9 hours of daylight per day in January in Isle Royale9
10 hours of daylight per day in February in Isle Royale10
12 hours of daylight per day in March in Isle Royale12
14 hours of daylight per day in April in Isle Royale14
15 hours of daylight per day in May in Isle Royale15
16 hours of daylight per day in June in Isle Royale16
16 hours of daylight per day in July in Isle Royale16
14 hours of daylight per day in August in Isle Royale14
13 hours of daylight per day in September in Isle Royale13
11 hours of daylight per day in October in Isle Royale11
9 hours of daylight per day in November in Isle Royale9
8 hours of daylight per day in December in Isle Royale8
UV Index (Maximum)
UV (maximum) index 1 (Low) in January in Isle Royale1
UV (maximum) index 1 (Low) in February in Isle Royale1
UV (maximum) index 3 (Moderate) in March in Isle Royale3
UV (maximum) index 4 (Moderate) in April in Isle Royale4
UV (maximum) index 6 (High) in May in Isle Royale6
UV (maximum) index 7 (High) in June in Isle Royale7
UV (maximum) index 7 (High) in July in Isle Royale7
UV (maximum) index 6 (High) in August in Isle Royale6
UV (maximum) index 5 (Moderate) in September in Isle Royale5
UV (maximum) index 2 (Low) in October in Isle Royale2
UV (maximum) index 1 (Low) in November in Isle Royale1
UV (maximum) index 1 (Low) in December in Isle Royale1

Rainfall in Isle Royale

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Number of days with some rain
10 days with some rainfall in January in Isle Royale10
8 days with some rainfall in February in Isle Royale8
9 days with some rainfall in March in Isle Royale9
8 days with some rainfall in April in Isle Royale8
10 days with some rainfall in May in Isle Royale10
13 days with some rainfall in June in Isle Royale13
11 days with some rainfall in July in Isle Royale11
12 days with some rainfall in August in Isle Royale12
13 days with some rainfall in September in Isle Royale13
11 days with some rainfall in October in Isle Royale11
9 days with some rainfall in November in Isle Royale9
11 days with some rainfall in December in Isle Royale11
Average monthly rainfall (inches)
2.5 inches monthly rainfall in January in Isle Royale2.5
1.5 inches monthly rainfall in February in Isle Royale1.5
1.9 inches monthly rainfall in March in Isle Royale1.9
1.7 inches monthly rainfall in April in Isle Royale1.7
2.7 inches monthly rainfall in May in Isle Royale2.7
3.2 inches monthly rainfall in June in Isle Royale3.2
3.0 inches monthly rainfall in July in Isle Royale3.0
3.3 inches monthly rainfall in August in Isle Royale3.3
3.4 inches monthly rainfall in September in Isle Royale3.4
2.7 inches monthly rainfall in October in Isle Royale2.7
2.3 inches monthly rainfall in November in Isle Royale2.3
2.3 inches monthly rainfall in December in Isle Royale2.3

More about Isle Royale

Isle Royale by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

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The climate guide for Michigan (Isle Royale) shows long term monthly weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

What's the climate like in Isle Royale?

Isle Royale has a cold climate with warm summers and some rainfall in all months.

Metric (°C)  |  Imperial (°F)

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More about the USA

Compare Isle Royale with the USA

Below the Isle Royale chart shows average maximum daytime temperature for Isle Royale, Michigan, USA and the USA (Washington).

Maximum daytime temperature (°F)

Isle Royale, Michigan, USA
USA (Washington)
41
45
32
55
46
66
59
75
68
84
75
88
72
86
63
79
52
68
36
57
46
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
18
21
23

Metric (°C)  |  Imperial (°F)

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