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Monthly
Precipitation
Temperature
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Temperature Unit Selection
°Celsius
°Fahrenheit
Monthly Historical Averages
Boise, ID
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September
Average Temperature
High
26°
Feels 26
Low
11°
Feels 11
Average Precipitation
3 Days
Rain amount
10mm
Snow amount
0cm
Content continues below
Daily Historical Averages
September 2026
S
M
T
W
T
F
S
1
2
25°
3
21°
4
21°
5
23°
6
25°
7
20°
8
23°
9
27°
10
27°
11
26°
12
25°
13
25°
14
25°
15
26°
16
26°
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Forecast
Wednesday, September 2, 2026
Day
25°
Feels 25
Wind
23 km/h SW
Gust
35 km/h
Humidity
18%
P.O.P
40%
Rain
<1 mm
Night
13°
Feels 12
Wind
27 km/h W
Gust
41 km/h
Humidity
82%
P.O.P
70%
Rain
1-3 mm
Historical Averages
Sep 2
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity
Historical Averages are based on data recorded from 2000 onwards.