Weather in San Bernardino: September
 |
Average day temperature: | 90.5°F |
| Average night temperature: | 69.5°F | |
 |
Number of sunny days: | 27 days |
| Day length: | 11.9 - 12.9 hours | |
 |
Number of rainy days: | 0 days |
| Precipitation totals: | 0.1 in. | |
| more information | ||
14 days
forecast
forecast
| San Bernardino |
weather in
October
October
| San Bernardino |
Air temperature in September, °F
Show year:
2025
2024
2023
The highest day temperature during September of 2025 was 101°F. At the same time the lowest night temperature was 59°F. Daily and nightly averages during September were 87.6°F and 69.7°F.
Sunny, partly cloudy and cloudy days
Mostly all days in September are sunny but cloudy days are also possible.
Precipitation total in September, in.
Precipitation total value in San Bernardino in September is 0.1 in. Other months of the year show relatively similar values.
Wind speed in September, mph
The average wind speed value in September is 4.0 mph It makes September one of the least windy months of the year.
Average sunny hours
This chart shows average number of hours during the day when sunlight can reach the ground. It depends on day length and cloudiness during the day. The average number of sunny hours in September is: 11.1.
Best time for vacation in San Bernardino
San Bernardino on a weather map
Places in USA:
Name
°F
24 Hours Forecast
San Bernardino
Local time: 20:15
December 04, thursday
2100
54°F
S
5 mph
5 mph
December 05, friday
0000
50°F
S
5 mph
5 mph
0300
46°F
SW
4 mph
4 mph
0600
43°F
S
4 mph
4 mph
0900
46°F
SW
3 mph
3 mph
1200
64°F
SE
2 mph
2 mph
1500
70°F
E
3 mph
3 mph
1800
61°F
SE
2 mph
2 mph
