Costa Mesa weather by month
Average highs run from 67°F in January to 79°F in July, and January nights average 49°F. It gets 11 inches of rain and melted snow a year, with almost no snow. The most comfortable months are January to December.
Best time to visit Costa Mesa
For comfortable weather, go in January to December. In those months the average high stays between 62°F and 86°F, nights average 42°F or warmer, and rain stays under 4.5 inches for the month.
Month by month
| Month | High | Low | Precip. | Snow | Wet days | Days 90°F+ | Nights below 32°F | Feels |
|---|---|---|---|---|---|---|---|---|
| January | 67°F | 49°F | 2.6 in | 0.0 in | 3 | 0 | 0 | mild |
| February | 67°F | 50°F | 2.6 in | 0.0 in | 5 | 0 | 0 | mild |
| March | 68°F | 52°F | 1.6 in | 0.0 in | 2 | 0 | 0 | mild |
| April | 70°F | 55°F | 0.5 in | 0.0 in | 1 | 1 | 0 | mild |
| May | 71°F | 59°F | 0.3 in | 0.0 in | 1 | 1 | 0 | mild |
| June | 74°F | 63°F | 0.0 in | 0.0 in | 0 | 1 | 0 | mild |
| July | 79°F | 66°F | 0.0 in | 0.0 in | 0 | 1 | 0 | warm |
| August | 80°F | 67°F | 0.0 in | 0.0 in | 0 | 2 | 0 | warm |
| September | 80°F | 65°F | 0.1 in | 0.0 in | 0 | 4 | 0 | warm |
| October | 77°F | 59°F | 0.5 in | 0.0 in | 1 | 3 | 0 | warm |
| November | 72°F | 53°F | 0.8 in | 0.0 in | 2 | 1 | 0 | mild |
| December | 67°F | 48°F | 2.0 in | 0.0 in | 3 | 0 | 0 | mild |
| Year | 73°F avg | 57°F avg | 11.2 in | 0.0 in | 19 | 13 | 0 |
"Wet days" are days with at least 0.1 inch of precipitation. "Feels" is a plain-language label for the average high. Normals for 1991-2020 from NOAA NCEI, station Santa Ana John Wayne Airport, CA (USW00093184), 3.6 miles from the city center; snowfall from Newport Beach Harbor, CA. Averages describe typical conditions, not a forecast.
Sunrise, sunset and daylight in Costa Mesa
The shortest day is December 21, with 9h 55m of daylight; the longest is June 21, with 14h 23m. The earliest sunset comes around December 1 (4:42 pm) and the latest around June 21 (8:05 pm). The sun sets after 8 pm on 43 days a year.
| On the 15th of | Sunrise | Sunset | Daylight |
|---|---|---|---|
| January | 6:56 am | 5:06 pm | 10h 10m |
| February | 6:35 am | 5:36 pm | 11h 00m |
| March | 7:02 am | 6:59 pm | 11h 57m |
| April | 6:21 am | 7:22 pm | 13h 02m |
| May | 5:51 am | 7:45 pm | 13h 54m |
| June | 5:41 am | 8:03 pm | 14h 22m |
| July | 5:52 am | 8:02 pm | 14h 10m |
| August | 6:14 am | 7:37 pm | 13h 23m |
| September | 6:35 am | 6:57 pm | 12h 22m |
| October | 6:56 am | 6:17 pm | 11h 21m |
| November | 6:23 am | 4:48 pm | 10h 25m |
| December | 6:49 am | 4:44 pm | 9h 56m |
Calculated for 2026 at the center of Costa Mesa with NOAA's solar equations, in local clock time (Pacific Time, including daylight saving time where it applies). Times shift by a minute or two from year to year.
Is Costa Mesa getting warmer?
The last 10 years averaged 2.8°F warmer than the 20th century. See the climate stripes for Costa Mesa.Frequently asked questions
What is the warmest month in Costa Mesa?
August is the warmest month, with an average high of 80°F and an average low of 67°F (NOAA 1991-2020 normals).
What is the coldest month in Costa Mesa?
December is the coldest, with average lows of 48°F and highs of 67°F.
What is the rainiest month in Costa Mesa?
February gets the most precipitation, 2.6 inches on average. June is the driest at 0.0 inches.
Does it snow in Costa Mesa?
Very little. The normal yearly snowfall is under one inch.
When is the best time to visit Costa Mesa?
For comfortable weather, January to December. Those months average highs between 62 and 86°F with lows of 42°F or more and modest rain.
Thinking of moving to Costa Mesa?
See what homes, rent and everyday prices cost, who lives there and how it compares with nearby cities on the full Costa Mesa profile.
Compare the weather: Costa Mesa vs Newport Beach, Costa Mesa vs Irvine, Costa Mesa vs Huntington Beach, Costa Mesa vs Santa Ana.