Average annual temperature is 17.6 °C
Absolute maximum temperature: 40.8 °C
Absolute minimum temperature: 0.2 °C
Number of sunny days: 265 days
Number of rainy days: 100 days
Look at detailed online map of San Bernardino
* Weather data for San Bernardino United States is based on climate observations for 2026 year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Absolute maximum temperature (°C) | 19.0 | 23.5 | 21.2 | 32.8 | 31.8 | 36.0 | 40.6 | 40.8 | 36.8 | 37.2 | 30.0 | 25.6 |
| Average daytime temperature (°C) | 14.9 | 16.3 | 15.9 | 24.3 | 24.9 | 27.4 | 36.9 | 34.7 | 29.5 | 28.6 | 23.3 | 19.9 |
| Average temperature (°C) | 10.0 | 9.6 | 10.6 | 15.8 | 17.3 | 19.3 | 28.4 | 26.9 | 22.2 | 20.5 | 16.0 | 13.4 |
| Average night temperature (°C) | 6.4 | 4.8 | 7.1 | 9.8 | 12.3 | 14.1 | 21.7 | 21.0 | 17.3 | 14.4 | 10.4 | 8.4 |
| Absolute minimum temperature (°C) | 1.9 | 0.2 | 0.4 | 1.4 | 8.1 | 12.0 | 14.4 | 16.6 | 13.9 | 10.1 | 4.9 | 4.0 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 14.0 | 14.0 | 13.0 | 12.0 | 11.0 | 10.0 | 10.0 |
| Daylight mean duration (h) | 10.2 | 11.0 | 12.0 | 13.0 | 13.9 | 14.4 | 14.2 | 13.4 | 12.4 | 11.3 | 10.4 | 9.9 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 13.0 | 12.0 | 11.0 | 10.0 | 10.0 | 9.0 |
| Sunshine mean duration (h) | 6.5 | 7.8 | 7.5 | 11.5 | 12.1 | 12.6 | 13.1 | 11.6 | 10.6 | 10.3 | 9.0 | 8.1 |
| Precipitation (mm) | 338 | 125 | 263 | 8 | 20 | 2 | 0 | 84 | 31 | 11 | 23 | 53 |
| Sunny days | 14 | 14 | 10 | 26 | 20 | 25 | 31 | 27 | 24 | 27 | 23 | 24 |
| Rainy days | 17 | 14 | 21 | 4 | 11 | 5 | 0 | 4 | 6 | 4 | 7 | 7 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The best time to visit San Bernardino during the most sunny months:
The largest precipitation sum in San Bernardino is at