Costa Mesa and Fountain Valley have remarkably similar climates.
The year at a glance
Averages from 30 years of climate history, 1991-2020
| Costa Mesa | Metric | Fountain Valley |
|---|---|---|
| 286 days | Sunny daysclear or partly cloudy skies | 286 days |
| 12 in | Precipitationper year | 12 in |
| 31 days | Wet daysrain or snow per year | 31 days |
| 0 in | Snowfallper year | 0 in |
| 12 days | Hot daysabove 90 °F | 17 days |
| 0 days | Freezing nightsat or below 32 °F | 0 days |
| 74% | Humidityaverage relative | 74% |
| 65 °F | Average temperatureyear round | 65 °F |
Monthly temperatures
Average daily high and low for each month, in °F. The gap between the two lines is what an ordinary day feels like across the year.
Daily highs
Daily lows
View monthly temperatures as a table
| City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Costa Mesa high | 67 | 66 | 67 | 70 | 71 | 73 | 78 | 79 | 79 | 76 | 71 | 66 |
| Fountain Valley high | 67 | 67 | 69 | 71 | 72 | 75 | 79 | 81 | 80 | 77 | 72 | 67 |
| Costa Mesa low | 49 | 50 | 52 | 55 | 59 | 62 | 66 | 67 | 65 | 60 | 53 | 49 |
| Fountain Valley low | 49 | 50 | 52 | 55 | 59 | 62 | 65 | 66 | 64 | 59 | 53 | 49 |
Monthly precipitation
Total rain plus melted snow for each month, in inches. Taller bars mean wetter months.
View monthly precipitation as a table
| City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Costa Mesa | 2.8 | 3.1 | 1.8 | 0.7 | 0.3 | 0.1 | 0.1 | 0.0 | 0.1 | 0.6 | 0.7 | 1.9 |
| Fountain Valley | 2.8 | 3.1 | 1.8 | 0.7 | 0.3 | 0.1 | 0.1 | 0.0 | 0.1 | 0.6 | 0.7 | 1.9 |
Monthly sunny days
Days each month with clear or partly cloudy skies, so compare the same month between cities.
View monthly sunny days as a table
| City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Costa Mesa | 19 | 18 | 21 | 23 | 24 | 26 | 29 | 30 | 28 | 26 | 24 | 21 |
| Fountain Valley | 19 | 18 | 21 | 23 | 24 | 26 | 29 | 30 | 28 | 26 | 24 | 21 |
Keep comparing
Nearby cities and popular picks for each side of this matchup. Any two cities can be compared from the home page.
Costa Mesa vs another city
- Costa Mesa vs Newport Beach, CA
- Costa Mesa vs Santa Ana, CA
- Costa Mesa vs Huntington Beach, CA
- Costa Mesa vs Midway City, CA
- Costa Mesa vs Tustin, CA
- Costa Mesa vs New York, NY
- Costa Mesa vs Los Angeles, CA
- Costa Mesa vs Chicago, IL
- Costa Mesa vs Houston, TX
- Costa Mesa vs Phoenix, AZ
- Costa Mesa vs Philadelphia, PA
Fountain Valley vs another city
- Fountain Valley vs Midway City, CA
- Fountain Valley vs Huntington Beach, CA
- Fountain Valley vs Westminster, CA
- Fountain Valley vs Santa Ana, CA
- Fountain Valley vs Garden Grove, CA
- Fountain Valley vs New York, NY
- Fountain Valley vs Los Angeles, CA
- Fountain Valley vs Chicago, IL
- Fountain Valley vs Houston, TX
- Fountain Valley vs Phoenix, AZ
- Fountain Valley vs Philadelphia, PA
About this data
Every figure on this page is a 30 year average computed from daily climate history for 1991-2020, using each city's own coordinates. Wet days count days with measurable precipitation, calibrated against the wet day counts in NOAA's published climate normals. Sunny days count clear plus partly cloudy days, defined as average cloud cover of 63 percent or less and calibrated against NOAA's published sky cover tables. Snowfall figures are model estimates anchored to NOAA station measurements near each city.
Weather data by Open-Meteo.com (CC BY 4.0). Contains modified Copernicus Climate Change Service information (ERA5, ERA5-Land).