Weather information for the San Bernardino area is provided below. Average temperatures, climate details and current forecasts are included.
San Bernardino has an overall temperate climate, but is far enough inland to experience more extremes than coastal areas. Mild winters are the norm, as well as hot summers with occasional afternoon rain showers.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | ||
| Avg. High | 67 | 69 | 71 | 77 | 81 | 90 | 96 | 96 | 91 | 83 | 73 | 66 | |
| Avg. Low | 42 | 44 | 45 | 49 | 54 | 58 | 63 | 64 | 61 | 54 | 45 | 41 | |
| Precipitation | 3.5 | 3.7 | 3.3 | 0.9 | 0.4 | 0.1 | 0.0 | 0.2 | 0.4 | 0.7 | 1.2 | 1.9 | |



