Costa Mesa, CA
Climate overview — based on NOAA 1991-2020 normals from SANTA ANA JOHN WAYNE AP, CA US.
Year-round temperatures (°F)
Climate summary
Costa Mesa has an annual average temperature of 64.9°F with about 11.2 inches of precipitation per year. The warmest month is August (average high 80.4°F), and the coldest is December (average low 48.3°F). February is typically the wettest month (2.64 in) and June the driest (0.01 in).
Best time to visit Costa Mesa
Full guide →Climate change signal
All-time records →166 of 366 (45.4%) of Costa Mesa'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 | 8 | |
| 2000s | 120 | |
| 2010s | 157 | |
| 2020s | 81 |
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 | 67.0°F | 48.6°F | 57.8°F | 2.59 in | — | 6 |
| February | 66.7°F | 50.1°F | 58.4°F | 2.64 in | — | 7 |
| March | 67.7°F | 52.3°F | 60.0°F | 1.62 in | — | 6 |
| April | 70.2°F | 54.9°F | 62.6°F | 0.52 in | — | 4 |
| May | 71.3°F | 59.3°F | 65.3°F | 0.27 in | — | 2 |
| June | 74.1°F | 62.6°F | 68.3°F | 0.01 in | — | 1 |
| July | 78.9°F | 66.2°F | 72.5°F | 0.04 in | — | 1 |
| August | 80.4°F | 67.1°F | 73.8°F | 0.01 in | — | 0 |
| September | 79.9°F | 65.0°F | 72.5°F | 0.10 in | — | 1 |
| October | 76.5°F | 59.2°F | 67.8°F | 0.54 in | — | 3 |
| November | 71.9°F | 53.3°F | 62.6°F | 0.80 in | — | 5 |
| December | 66.5°F | 48.3°F | 57.4°F | 2.04 in | — | 7 |
Climate twins of Costa Mesa
Why these? →The most climatically similar US cities at least 140 miles away (by monthly temperature + precipitation pattern).