+33.6411° · -117.9187° · ELEV 0m
Costa Mesa
United States · California
Monthly weather averages for Costa Mesa, United States — temperature highs and lows, rainfall, sunshine hours by month, and the best time to visit.
№ 01
August → JanuaryClimate Overview
Costa Mesa has a Mediterranean climate. The warmest month is August (25°C average high) and the coolest is December (18°C).
№ 02
352 mm / yearRainfall by Month
Costa Mesa sees 352 mm of rain a year. The wettest month is December (76 mm); the driest is July (2 mm).
№ 03
June–NovemberBest Time to Visit
June–November
12°C – 25°C · 11.3h sun
The best time to visit Costa Mesa is June–November, when temperatures average 12°C–25°C with 11.3 sunshine hours per day.
Some visitors prefer December–May for cooler, drier conditions.
№ 04
12 months · °C · mm · hoursMonthly Breakdown
| January | 17.6°C | 9.2°C | 72 mm | 8.5 h | 06:55 | 17:05 |
|---|---|---|---|---|---|---|
| February | 18.0°C | 9.3°C | 49 mm | 9.4 h | 06:36 | 17:35 |
| March | 18.0°C | 10.6°C | 62 mm | 10.4 h | 07:02 | 18:59 |
| April | 19.7°C | 12.4°C | 16 mm | 11.3 h | 06:20 | 19:22 |
| May | 19.9°C | 13.9°C | 12 mm | 11.8 h | 05:51 | 19:45 |
| June | 22.2°C | 15.9°C | 3 mm | 12.4 h | 05:40 | 20:03 |
| July | 24.4°C | 17.9°C | 2 mm | 12.9 h | 05:52 | 20:02 |
| August | 25.2°C | 18.4°C | 10 mm | 12.1 h | 06:13 | 19:38 |
| September | 25.2°C | 18.1°C | 13 mm | 11.1 h | 06:35 | 18:58 |
| October | 23.9°C | 15.7°C | 13 mm | 10.1 h | 06:56 | 18:18 |
| November | 21.1°C | 12.0°C | 24 mm | 9.4 h | 06:23 | 16:49 |
| December | 17.5°C | 9.6°C | 76 mm | 8.0 h | 06:48 | 16:44 |