San Dimas, CA
Climate overview — based on NOAA 1991-2020 normals from POMONA/FAIRPLEX, CA US.
Year-round temperatures (°F)
Climate summary
San Dimas has an annual average temperature of 65.1°F with about 14.5 inches of precipitation per year. The warmest month is August (average high 92.4°F), and the coldest is December (average low 41.5°F). February is typically the wettest month (4.15 in) and July the driest (0.00 in).
Best time to visit San Dimas
Full guide →Climate change signal
All-time records →0 of 366 (0%) of San Dimas's all-time daily heat records have been set since 2015. If records were spread evenly across the station's history, only about 5% would fall in any given decade.
| 1890s | 27 | |
| 1900s | 15 | |
| 1910s | 21 | |
| 1920s | 29 | |
| 1930s | 31 | |
| 1940s | 29 | |
| 1950s | 49 | |
| 1960s | 36 | |
| 1970s | 25 | |
| 1980s | 55 | |
| 1990s | 15 | |
| 2000s | 32 | |
| 2010s | 2 |
Bars: number of all-time daily heat records still standing that were set in each decade.
Monthly averages
| Month | Avg High | Avg Low | Avg Temp | Precipitation | Snow | Rainy days |
|---|---|---|---|---|---|---|
| January | 67.9°F | 43.1°F | 55.5°F | 2.91 in | — | 5 |
| February | 67.3°F | 44.5°F | 55.9°F | 4.15 in | — | 6 |
| March | 72.0°F | 47.0°F | 59.5°F | 2.12 in | — | 4 |
| April | 75.8°F | 49.6°F | 62.7°F | 0.97 in | — | 2 |
| May | 78.4°F | 54.0°F | 66.2°F | 0.22 in | — | 1 |
| June | 84.3°F | 57.2°F | 70.8°F | 0.06 in | — | 0 |
| July | 90.3°F | 62.3°F | 76.3°F | 0.00 in | — | 0 |
| August | 92.4°F | 62.7°F | 77.5°F | 0.03 in | — | 0 |
| September | 88.7°F | 60.4°F | 74.6°F | 0.01 in | — | 0 |
| October | 80.5°F | 53.9°F | 67.2°F | 0.97 in | — | 3 |
| November | 73.5°F | 47.0°F | 60.2°F | 0.74 in | — | 3 |
| December | 66.9°F | 41.5°F | 54.2°F | 2.29 in | — | 5 |
Climate twins of San Dimas
Why these? →The most climatically similar US cities at least 140 miles away (by monthly temperature + precipitation pattern).