Climate
Fairfield weather by month
Average highs, lows, rain and snow for every month, from 30 years of weather records.
Average temperatures
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
Best time to visit: April, May, October, when highs are mild and rain is lightest.
Month by month
| Month | High | Low | Rain | Wet days |
|---|---|---|---|---|
| January | 57°F | 40°F | 4.7 in | 10 |
| February | 62°F | 43°F | 5.0 in | 10 |
| March | 66°F | 45°F | 3.3 in | 9 |
| April | 71°F | 48°F | 1.5 in | 5 |
| May | 78°F | 52°F | 0.70 in | 3 |
| June | 85°F | 56°F | 0.20 in | 1 |
| July | 90°F | 58°F | 0.00 in | 0 |
| August | 89°F | 58°F | 0.00 in | 0 |
| September | 87°F | 57°F | 0.10 in | 1 |
| October | 78°F | 52°F | 1.1 in | 3 |
| November | 66°F | 45°F | 2.5 in | 7 |
| December | 57°F | 40°F | 5.4 in | 10 |
NOAA U.S. Climate Normals 1991–2020, Fairfield, Ca Us (1.3 mi away, 40 ft). Wet days: days with at least 0.01 in of precipitation.
Questions
What is the hottest month in Fairfield?
July, with an average high of 90°F and low of 58°F.
What is the coldest month in Fairfield?
December, with an average low of 40°F and high of 57°F.
When does it rain most in Fairfield?
December is the wettest month, averaging 5.4 in of precipitation; the year totals about 24.5 inches.
What is the best time to visit Fairfield?
For mild weather (highs between 65°F and 85°F) with the least rain, April, May, October.
Where do these numbers come from?
NOAA’s 1991–2020 U.S. Climate Normals for the Fairfield weather station, 1.3 miles from downtown: 30-year averages, not a forecast.