Fairfield weather by month
Average highs run from 57°F in January to 90°F in July, and January nights average 40°F. It gets 24 inches of rain and melted snow a year, with almost no snow. Expect about 60 days a year at 90°F or hotter. The most comfortable months are March to June and October to November.
Best time to visit Fairfield
For comfortable weather, go in March to June and October to November. 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 | 57°F | 40°F | 4.7 in | 0.0 in | 8 | 0 | 3 | cool |
| February | 62°F | 43°F | 5.0 in | 0.0 in | 8 | 0 | 1 | cool |
| March | 66°F | 45°F | 3.3 in | 0.0 in | 7 | 0 | 0 | mild |
| April | 71°F | 48°F | 1.5 in | 0.0 in | 3 | 1 | 0 | mild |
| May | 78°F | 52°F | 0.7 in | 0.0 in | 2 | 4 | 0 | warm |
| June | 85°F | 56°F | 0.2 in | 0.0 in | 0 | 10 | 0 | warm |
| July | 90°F | 58°F | 0.0 in | 0.0 in | 0 | 15 | 0 | hot |
| August | 89°F | 58°F | 0.0 in | 0.0 in | 0 | 15 | 0 | hot |
| September | 87°F | 57°F | 0.1 in | 0.0 in | 0 | 12 | 0 | warm |
| October | 78°F | 52°F | 1.1 in | 0.0 in | 2 | 3 | 0 | warm |
| November | 66°F | 45°F | 2.6 in | 0.0 in | 5 | 0 | 0 | mild |
| December | 57°F | 40°F | 5.4 in | 0.0 in | 8 | 0 | 4 | cool |
| Year | 74°F avg | 50°F avg | 24.5 in | 0.0 in | 42 | 60 | 8 |
"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 Fairfield, CA (USC00042934), 1.8 miles from the city center. Averages describe typical conditions, not a forecast.
Sunrise, sunset and daylight in Fairfield
The shortest day is December 21, with 9h 30m of daylight; the longest is June 21, with 14h 49m. The earliest sunset comes around December 1 (4:47 pm) and the latest around June 23 (8:35 pm). The sun sets after 8 pm on 106 days a year.
| On the 15th of | Sunrise | Sunset | Daylight |
|---|---|---|---|
| January | 7:23 am | 5:11 pm | 9h 48m |
| February | 6:58 am | 5:46 pm | 10h 48m |
| March | 7:19 am | 7:15 pm | 11h 56m |
| April | 6:32 am | 7:44 pm | 13h 12m |
| May | 5:57 am | 8:12 pm | 14h 15m |
| June | 5:44 am | 8:33 pm | 14h 49m |
| July | 5:57 am | 8:30 pm | 14h 33m |
| August | 6:23 am | 8:01 pm | 13h 38m |
| September | 6:50 am | 7:15 pm | 12h 25m |
| October | 7:17 am | 6:29 pm | 11h 12m |
| November | 6:49 am | 4:55 pm | 10h 05m |
| December | 7:18 am | 4:48 pm | 9h 31m |
Calculated for 2026 at the center of Fairfield 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 Fairfield getting warmer?
The last 10 years averaged 2.3°F warmer than the 20th century. See the climate stripes for Fairfield.Frequently asked questions
What is the warmest month in Fairfield?
July is the warmest month, with an average high of 90°F and an average low of 58°F (NOAA 1991-2020 normals).
What is the coldest month in Fairfield?
December is the coldest, with average lows of 40°F and highs of 57°F.
What is the rainiest month in Fairfield?
December gets the most precipitation, 5.4 inches on average. July is the driest at 0.0 inches.
Does it snow in Fairfield?
Very little. The normal yearly snowfall is under one inch.
When is the best time to visit Fairfield?
For comfortable weather, March to June and October to November. Those months average highs between 62 and 86°F with lows of 42°F or more and modest rain.
Thinking of moving to Fairfield?
See what homes, rent and everyday prices cost, who lives there and how it compares with nearby cities on the full Fairfield profile.
Compare the weather: Fairfield vs Vacaville, Fairfield vs Napa, Fairfield vs Vallejo, Fairfield vs Pittsburg.