Union City, CA
Climate overview — based on NOAA 1991-2020 normals from FREMONT, CA US.
Year-round temperatures (°F)
Climate summary
Union City has an annual average temperature of 59.5°F with about 15.9 inches of precipitation per year. The warmest month is September (average high 78.3°F), and the coldest is December (average low 42.5°F). February is typically the wettest month (3.17 in) and July the driest (0.00 in).
Best time to visit Union City
Full guide →Climate change signal
All-time records →133 of 366 (36.3%) of Union City'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.
| 1990s | 64 | |
| 2000s | 116 | |
| 2010s | 122 | |
| 2020s | 64 |
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 | 58.6°F | 42.6°F | 50.6°F | 3.00 in | — | 10 |
| February | 61.4°F | 44.4°F | 52.9°F | 3.17 in | — | 10 |
| March | 65.1°F | 46.4°F | 55.8°F | 2.52 in | — | 10 |
| April | 67.7°F | 48.3°F | 58.0°F | 1.22 in | — | 6 |
| May | 71.1°F | 51.9°F | 61.5°F | 0.50 in | — | 3 |
| June | 75.3°F | 54.7°F | 65.0°F | 0.16 in | — | 1 |
| July | 77.9°F | 56.8°F | 67.3°F | 0.00 in | — | 0 |
| August | 78.2°F | 57.1°F | 67.7°F | 0.02 in | — | 0 |
| September | 78.3°F | 56.0°F | 67.2°F | 0.10 in | — | 1 |
| October | 73.3°F | 52.0°F | 62.6°F | 0.69 in | — | 3 |
| November | 64.6°F | 46.2°F | 55.4°F | 1.59 in | — | 7 |
| December | 58.4°F | 42.5°F | 50.5°F | 2.97 in | — | 10 |
Climate twins of Union City
Why these? →The most climatically similar US cities at least 140 miles away (by monthly temperature + precipitation pattern).