Weather in San Bernardino in September
In an average September, San Bernardino sees a daily high around 85°F and a low around 62°F, based on 1980–2026 of local climate records.
| Average high | 85°F |
|---|---|
| Typical high range | 76°F to 94°F |
| Average low | 62°F |
| Typical low range | 55°F to 68°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
111°F
2020-09-06
Lowest
58°F
1986-09-24
Low
Highest
80°F
2022-09-04
Lowest
47°F
1982-09-30
Feels-like
Highest
123°F
2022-09-05
Lowest
42°F
2007-09-21
Humidity
Highest
17.9 g/m³
2017-09-04
Lowest
3.0 g/m³
2013-09-29
Wind
Highest
13 mph
2007-09-21
Lowest
3 mph
2022-09-10
Gust
Highest
33 mph
2007-09-21
Lowest
13 mph
2025-09-22
Precip
Wettest
1.76 in
1997
Driest
0.00 in
2020
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