The temperatures in San Bernardino in September are comfortable with low of 14°C and and high up to 32°C.
There is little to no rain in San Bernardino during September, so it’s a lot easier to explore the city. Just remember to dress in warm layers, as it can still get pretty chilly.
Our weather forecast can give you a great sense of what weather to expect in San Bernardino in September 2025.
If you’re planning to visit San Bernardino in the near future, we highly recommend that you review the 14 day weather forecast for San Bernardino before you arrive.
Temperatures
32° / 14°
Rainy Days
0
Snowy Days
0
Dry Days
30
Rainfall
7
mm
Sun Hours
12.0
Hrs
