Weather & Climate
San Bernardino County, California, United States
Overview
Available climate summaries for San Bernardino County. Origins and reference periods are unverified; stored values may include AI estimates. Treat these as estimates until independently verified.
Key Metrics
Annual Avg
20.1°C
Summer Avg
31.2°C
Winter Avg
9.6°C
Record High
47.2°C
Record Low
-4.9°C
Annual Precipitation
129.4 mm
Avg Humidity
33%
Summer Humidity
22%
Winter Humidity
46%
Monthly Averages
| Month | High (°C) | Avg (°C) | Low (°C) | Rain (mm) | Humidity (%) | Sunshine (h) | Wind (kph) |
|---|---|---|---|---|---|---|---|
| Jan | 27.6° | 9.3° | -4.9° | 18 | 46% | 105 | 55.6 |
| Feb | 28.6° | 10.9° | -4.9° | 19 | 45% | 123 | 54.8 |
| Mar | 33.9° | 14.7° | -2° | 10.8 | 41% | 181 | 62.7 |
| Apr | 38.4° | 18.1° | 1.2° | 7.5 | 35% | 215 | 48.6 |
| May | 44.1° | 23.3° | 5.4° | 2.8 | 28% | 250 | 48.2 |
| Jun | 47° | 29.1° | 9° | 0.3 | 20% | 256 | 54.9 |
| Jul | 47.2° | 32.8° | 16° | 11.2 | 22% | 241 | 41 |
| Aug | 46.3° | 31.7° | 15.1° | 11.2 | 23% | 226 | 35 |
| Sep | 46.5° | 27.9° | 8.9° | 6.3 | 25% | 191 | 46.1 |
| Oct | 39.4° | 20.9° | 1.1° | 9 | 29% | 156 | 41.2 |
| Nov | 32.4° | 14.2° | -4.2° | 13.5 | 36% | 112 | 49.7 |
| Dec | 25.4° | 8.7° | -4.1° | 19.8 | 46% | 93 | 47.1 |
Data sources
Estimates and unverified origins
Oyster List climate data - Climate origins are unverified. Available methods include historical APIs and AI estimates; stored rows do not identify the original dataset, reference period, or model for each value. Treat these summaries as estimates until independently verified. Record updated 2026-03-22.