Boise weather by month

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

Temperature in Boise (°F)

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Max temperature (daytime)
36°F maximum daytime temperature in January in Boise36
45°F maximum daytime temperature in February in Boise45
54°F maximum daytime temperature in March in Boise54
61°F maximum daytime temperature in April in Boise61
72°F maximum daytime temperature in May in Boise72
81°F maximum daytime temperature in June in Boise81
90°F maximum daytime temperature in July in Boise90
88°F maximum daytime temperature in August in Boise88
77°F maximum daytime temperature in September in Boise77
64°F maximum daytime temperature in October in Boise64
48°F maximum daytime temperature in November in Boise48
37°F maximum daytime temperature in December in Boise37
Min temperature (night-time)
21°F minimum night-time temperature in January in Boise21
27°F minimum night-time temperature in February in Boise27
30°F minimum night-time temperature in March in Boise30
36°F minimum night-time temperature in April in Boise36
43°F minimum night-time temperature in May in Boise43
52°F minimum night-time temperature in June in Boise52
57°F minimum night-time temperature in July in Boise57
55°F minimum night-time temperature in August in Boise55
46°F minimum night-time temperature in September in Boise46
37°F minimum night-time temperature in October in Boise37
30°F minimum night-time temperature in November in Boise30
21°F minimum night-time temperature in December in Boise21
Heat & Humidity
No heat & humidity in January in Boise0
No heat & humidity in February in Boise0
No heat & humidity in March in Boise0
No heat & humidity in April in Boise0
No heat & humidity in May in Boise0
Low heat & humidity in June in BoiseL
Moderate heat & humidity in July in BoiseM
Moderate heat & humidity in August in BoiseM
No heat & humidity in September in Boise0
No heat & humidity in October in Boise0
No heat & humidity in November in Boise0
No heat & humidity in December in Boise0

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

Sunshine & Daylight in Boise

  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 Boise9
11 hours of daylight per day in February in Boise11
12 hours of daylight per day in March in Boise12
13 hours of daylight per day in April in Boise13
15 hours of daylight per day in May in Boise15
15 hours of daylight per day in June in Boise15
15 hours of daylight per day in July in Boise15
14 hours of daylight per day in August in Boise14
12 hours of daylight per day in September in Boise12
11 hours of daylight per day in October in Boise11
10 hours of daylight per day in November in Boise10
9 hours of daylight per day in December in Boise9
UV Index (Maximum)
UV (maximum) index 1 (Low) in January in Boise1
UV (maximum) index 2 (Low) in February in Boise2
UV (maximum) index 4 (Moderate) in March in Boise4
UV (maximum) index 6 (High) in April in Boise6
UV (maximum) index 7 (High) in May in Boise7
UV (maximum) index 9 (Very High) in June in Boise9
UV (maximum) index 9 (Very High) in July in Boise9
UV (maximum) index 8 (Very High) in August in Boise8
UV (maximum) index 6 (High) in September in Boise6
UV (maximum) index 4 (Moderate) in October in Boise4
UV (maximum) index 2 (Low) in November in Boise2
UV (maximum) index 1 (Low) in December in Boise1

Rainfall in Boise

  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 Boise12
10 days with some rainfall in February in Boise10
10 days with some rainfall in March in Boise10
8 days with some rainfall in April in Boise8
7 days with some rainfall in May in Boise7
6 days with some rainfall in June in Boise6
3 days with some rainfall in July in Boise3
3 days with some rainfall in August in Boise3
4 days with some rainfall in September in Boise4
6 days with some rainfall in October in Boise6
10 days with some rainfall in November in Boise10
11 days with some rainfall in December in Boise11
Average monthly rainfall (inches)
1.5 inches monthly rainfall in January in Boise1.5
1.1 inches monthly rainfall in February in Boise1.1
1.3 inches monthly rainfall in March in Boise1.3
1.2 inches monthly rainfall in April in Boise1.2
1.1 inches monthly rainfall in May in Boise1.1
0.8 inches monthly rainfall in June in Boise0.8
0.3 inches monthly rainfall in July in Boise0.3
0.4 inches monthly rainfall in August in Boise0.4
0.7 inches monthly rainfall in September in Boise0.7
0.7 inches monthly rainfall in October in Boise0.7
1.5 inches monthly rainfall in November in Boise1.5
1.4 inches monthly rainfall in December in Boise1.4

More about Boise

Boise by month

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

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The climate guide for Idaho (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.

What's the climate like in Boise?

Boise has a cool semi arid climate with hot summers.

Metric (°C)  |  Imperial (°F)

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More about the USA

Compare Boise with the USA

Below the Boise chart shows average maximum daytime temperature for Boise, Idaho, USA and the USA (Washington).

Maximum daytime temperature (°F)

Boise, Idaho, USA
USA (Washington)
36
41
45
45
54
55
61
66
72
75
81
84
90
88
88
86
77
79
64
68
48
57
37
46
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Metric (°C)  |  Imperial (°F)

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