Weather in Boise in September
In an average September, Boise sees a daily high around 81°F and a low around 53°F, based on 1980–2026 of local climate records.
| Average high | 81°F |
|---|---|
| Typical high range | 68°F to 92°F |
| Average low | 53°F |
| Typical low range | 45°F to 62°F |
| Average daily precipitation | 0.00 in |
September records
The most extreme September on record for each metric, across 1980–2026. For rainfall, the wettest and driest are by total September accumulation.
High
Highest
104°F
2022-09-03
Lowest
53°F
1986-09-27
Low
Highest
74°F
1998-09-05
Lowest
31°F
1984-09-25
Feels-like
Highest
109°F
2000-09-14
Lowest
22°F
1984-09-25
Humidity
Highest
14.3 g/m³
1980-09-10
Lowest
2.9 g/m³
1993-09-21
Wind
Highest
28 mph
2020-09-07
Lowest
3 mph
2010-09-13
Gust
Highest
50 mph
2020-09-08
Lowest
10 mph
2015-09-30
Precip
Wettest
2.36 in
1985
Driest
0.00 in
1999
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