Average annual temperature is 21.9 °C
Absolute maximum temperature: 47.5 °C
Absolute minimum temperature: 0.0 °C
Number of sunny days: 310 days
Number of rainy days: 55 days
Look at detailed online map of San Bernardino County
* Weather data for San Bernardino County 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) | 18.3 | 24.5 | 24.4 | 37.7 | 38.4 | 40.9 | 47.5 | 43.8 | 41.5 | 36.1 | 29.2 | 23.1 |
| Average daytime temperature (°C) | 14.5 | 17.4 | 18.9 | 28.9 | 32.7 | 35.3 | 43.8 | 39.7 | 35.5 | 29.7 | 21.2 | 17.6 |
| Average temperature (°C) | 10.0 | 11.6 | 13.0 | 21.7 | 25.4 | 27.9 | 36.9 | 33.1 | 28.9 | 23.6 | 16.2 | 13.3 |
| Average night temperature (°C) | 6.0 | 6.3 | 8.2 | 15.4 | 18.6 | 21.0 | 29.5 | 26.7 | 22.9 | 18.2 | 11.4 | 9.3 |
| Absolute minimum temperature (°C) | 1.2 | 0.0 | 3.3 | 3.8 | 10.6 | 16.3 | 23.6 | 21.8 | 17.4 | 7.9 | 5.6 | 5.5 |
| 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 | 9.0 |
| Daylight mean duration (h) | 10.1 | 10.9 | 12.0 | 13.1 | 14.0 | 14.5 | 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) | 7.5 | 9.0 | 9.5 | 12.0 | 12.9 | 13.1 | 13.1 | 11.5 | 10.8 | 10.4 | 9.0 | 8.3 |
| Precipitation (mm) | 39 | 8 | 59 | 0 | 2 | 5 | 0 | 36 | 9 | 1 | 10 | 5 |
| Sunny days | 20 | 20 | 18 | 30 | 28 | 26 | 31 | 27 | 25 | 29 | 28 | 28 |
| Rainy days | 11 | 8 | 13 | 0 | 3 | 4 | 0 | 4 | 5 | 2 | 2 | 3 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in San Bernardino County is at