Idaho climate guide

Temperature in Idaho (°C)

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Max temperature (daytime)
2°C maximum daytime temperature in January in Idaho (Boise)2
7°C maximum daytime temperature in February in Idaho (Boise)7
12°C maximum daytime temperature in March in Idaho (Boise)12
16°C maximum daytime temperature in April in Idaho (Boise)16
22°C maximum daytime temperature in May in Idaho (Boise)22
27°C maximum daytime temperature in June in Idaho (Boise)27
32°C maximum daytime temperature in July in Idaho (Boise)32
31°C maximum daytime temperature in August in Idaho (Boise)31
25°C maximum daytime temperature in September in Idaho (Boise)25
18°C maximum daytime temperature in October in Idaho (Boise)18
9°C maximum daytime temperature in November in Idaho (Boise)9
3°C maximum daytime temperature in December in Idaho (Boise)3
Min temperature (night-time)
-6°C minimum night-time temperature in January in Idaho (Boise)-6
-3°C minimum night-time temperature in February in Idaho (Boise)-3
-1°C minimum night-time temperature in March in Idaho (Boise)-1
2°C minimum night-time temperature in April in Idaho (Boise)2
6°C minimum night-time temperature in May in Idaho (Boise)6
11°C minimum night-time temperature in June in Idaho (Boise)11
14°C minimum night-time temperature in July in Idaho (Boise)14
13°C minimum night-time temperature in August in Idaho (Boise)13
8°C minimum night-time temperature in September in Idaho (Boise)8
3°C minimum night-time temperature in October in Idaho (Boise)3
-1°C minimum night-time temperature in November in Idaho (Boise)-1
-6°C minimum night-time temperature in December in Idaho (Boise)-6

Sunshine & Daylight in Idaho

  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 Idaho (Boise)9
11 hours of daylight per day in February in Idaho (Boise)11
12 hours of daylight per day in March in Idaho (Boise)12
13 hours of daylight per day in April in Idaho (Boise)13
15 hours of daylight per day in May in Idaho (Boise)15
15 hours of daylight per day in June in Idaho (Boise)15
15 hours of daylight per day in July in Idaho (Boise)15
14 hours of daylight per day in August in Idaho (Boise)14
12 hours of daylight per day in September in Idaho (Boise)12
11 hours of daylight per day in October in Idaho (Boise)11
10 hours of daylight per day in November in Idaho (Boise)10
9 hours of daylight per day in December in Idaho (Boise)9

Rainfall in Idaho

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Number of days with some rain
12 days with some rainfall in January in Idaho (Boise)12
10 days with some rainfall in February in Idaho (Boise)10
10 days with some rainfall in March in Idaho (Boise)10
8 days with some rainfall in April in Idaho (Boise)8
7 days with some rainfall in May in Idaho (Boise)7
6 days with some rainfall in June in Idaho (Boise)6
3 days with some rainfall in July in Idaho (Boise)3
3 days with some rainfall in August in Idaho (Boise)3
4 days with some rainfall in September in Idaho (Boise)4
6 days with some rainfall in October in Idaho (Boise)6
10 days with some rainfall in November in Idaho (Boise)10
11 days with some rainfall in December in Idaho (Boise)11
Average monthly rainfall (mm)
38 mm monthly rainfall in January in Idaho (Boise)38
28 mm monthly rainfall in February in Idaho (Boise)28
32 mm monthly rainfall in March in Idaho (Boise)32
30 mm monthly rainfall in April in Idaho (Boise)30
27 mm monthly rainfall in May in Idaho (Boise)27
21 mm monthly rainfall in June in Idaho (Boise)21
8 mm monthly rainfall in July in Idaho (Boise)8
10 mm monthly rainfall in August in Idaho (Boise)10
19 mm monthly rainfall in September in Idaho (Boise)19
19 mm monthly rainfall in October in Idaho (Boise)19
38 mm monthly rainfall in November in Idaho (Boise)38
36 mm monthly rainfall in December in Idaho (Boise)36

More climate for Idaho

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (Maximum)
UV (maximum) index 1 (Low) in January in Idaho (Boise)1
UV (maximum) index 2 (Low) in February in Idaho (Boise)2
UV (maximum) index 4 (Moderate) in March in Idaho (Boise)4
UV (maximum) index 6 (High) in April in Idaho (Boise)6
UV (maximum) index 7 (High) in May in Idaho (Boise)7
UV (maximum) index 9 (Very High) in June in Idaho (Boise)9
UV (maximum) index 9 (Very High) in July in Idaho (Boise)9
UV (maximum) index 8 (Very High) in August in Idaho (Boise)8
UV (maximum) index 6 (High) in September in Idaho (Boise)6
UV (maximum) index 4 (Moderate) in October in Idaho (Boise)4
UV (maximum) index 2 (Low) in November in Idaho (Boise)2
UV (maximum) index 1 (Low) in December in Idaho (Boise)1
Heat & Humidity
No heat & humidity in January in Idaho (Boise)0
No heat & humidity in February in Idaho (Boise)0
No heat & humidity in March in Idaho (Boise)0
No heat & humidity in April in Idaho (Boise)0
No heat & humidity in May in Idaho (Boise)0
Low heat & humidity in June in Idaho (Boise)L
Moderate heat & humidity in July in Idaho (Boise)M
Moderate heat & humidity in August in Idaho (Boise)M
No heat & humidity in September in Idaho (Boise)0
No heat & humidity in October in Idaho (Boise)0
No heat & humidity in November in Idaho (Boise)0
No heat & humidity in December in Idaho (Boise)0

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

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The climate guide for Idaho, represented by Boise, 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.

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