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Fairfield, CA Weather by Month and Climate Averages
Monthly normals · Rain · Snow
Sunshine · Freeze dates · Records · Best time to visit
What is the weather like in Fairfield, CA?
Fairfield, CA gets 24.5 in of precipitation a year over about 59 rainy days. July is the warmest month (average high 90°F) and January the coldest (average low 40°F).
Mediterranean climate
Fairfield, CA has hot summers and mild winters. Daytime highs range from about 57°F in January to 90°F in July. December is usually the wettest month. The most comfortable time to visit is typically March to May and October to November, when daytime highs sit near 72°F.
| Season | Months | Avg low | Avg high |
|---|---|---|---|
| Winter | Dec–Feb | 41° | 58° |
| Spring | Mar–May | 48° | 72° |
| Summer | Jun–Aug | 57° | 88° |
| Autumn | Sep–Nov | 51° | 77° |
How much rain does Fairfield get?
Fairfield gets 24.5 in of precipitation in an average year, spread over about 59 days with measurable rain. That is fewer rainy days than 76% of the US.
December is the wettest month, with 5.4 in. July is the driest, with 0.0 in. January has the most rainy days, about 10.
The longest dry spell in the last five years lasted 152 days, to October 30, 2024.
From September 2025 to August 2026 Fairfield got 12.7 in of rain, against a normal of 24.5 in for those months. January 2026 had the most, with 4.1 in.
See where Fairfield ranks: rainiest cities in the US, US cities with the most rainy days, rainiest cities in California.
Fairfield weather by month
Fairfield weather in January
In January, Fairfield averages a high of 57°F and a low of 40°F. It gets 4.7 in of precipitation over about 10 rainy days. Estimated sunshine is 34% of daylight hours, derived from ERA5 cloud cover. The January record high is 78°F (2021) and the record low is 18°F (1979).
Fairfield weather in February
In February, Fairfield averages a high of 62°F and a low of 43°F. It gets 5.0 in of precipitation over about 10 rainy days. Estimated sunshine is 55% of daylight hours, derived from ERA5 cloud cover. The February record high is 79°F (2016) and the record low is 24°F (1985).
Fairfield weather in March
In March, Fairfield averages a high of 66°F and a low of 45°F. It gets 3.3 in of precipitation over about 9 rainy days. Estimated sunshine is 50% of daylight hours, derived from ERA5 cloud cover. The March record high is 90°F (2026) and the record low is 29°F (1971). March is one of the most comfortable months to visit.
Fairfield weather in April
In April, Fairfield averages a high of 71°F and a low of 47°F. It gets 1.5 in of precipitation over about 5 rainy days. Estimated sunshine is 63% of daylight hours, derived from ERA5 cloud cover. The April record high is 97°F (2009) and the record low is 26°F (2010). April is one of the most comfortable months to visit.
Fairfield weather in May
In May, Fairfield averages a high of 78°F and a low of 52°F. It gets 0.7 in of precipitation over about 3 rainy days. Estimated sunshine is 71% of daylight hours, derived from ERA5 cloud cover. The May record high is 111°F (1984) and the record low is 35°F (1976). May is one of the most comfortable months to visit.
Fairfield weather in June
In June, Fairfield averages a high of 85°F and a low of 55°F. It gets 0.2 in of precipitation over about 1 rainy days. Estimated sunshine is 75% of daylight hours, derived from ERA5 cloud cover. The June record high is 111°F (1981) and the record low is 32°F (2011).
Fairfield weather in July
In July, Fairfield averages a high of 90°F and a low of 57°F. It gets 0.0 in of precipitation over about 0 rainy days. Estimated sunshine is 82% of daylight hours, derived from ERA5 cloud cover. The July record high is 114°F (2006) and the record low is 38°F (1982).
Fairfield weather in August
In August, Fairfield averages a high of 90°F and a low of 57°F. It gets 0.0 in of precipitation over about 0 rainy days. Estimated sunshine is 80% of daylight hours, derived from ERA5 cloud cover. The August record high is 111°F (1998) and the record low is 35°F (1986).
Fairfield weather in September
In September, Fairfield averages a high of 87°F and a low of 56°F. It gets 0.1 in of precipitation over about 1 rainy days. Estimated sunshine is 79% of daylight hours, derived from ERA5 cloud cover. The September record high is 114°F (2022) and the record low is 39°F (1986).
Fairfield weather in October
In October, Fairfield averages a high of 79°F and a low of 52°F. It gets 1.1 in of precipitation over about 3 rainy days. Estimated sunshine is 70% of daylight hours, derived from ERA5 cloud cover. The October record high is 102°F (2024) and the record low is 32°F (2011). October is one of the most comfortable months to visit.
Fairfield weather in November
In November, Fairfield averages a high of 66°F and a low of 45°F. It gets 2.5 in of precipitation over about 7 rainy days. Estimated sunshine is 55% of daylight hours, derived from ERA5 cloud cover. The November record high is 87°F (2008) and the record low is 21°F (1985). November is one of the most comfortable months to visit.
Fairfield weather in December
In December, Fairfield averages a high of 57°F and a low of 40°F. It gets 5.4 in of precipitation over about 10 rainy days. Estimated sunshine is 33% of daylight hours, derived from ERA5 cloud cover. The December record high is 78°F (1977) and the record low is 15°F (2011).
Sunshine, humidity and wind in Fairfield
July is the sunniest month in Fairfield, with estimated sunshine of 82% of daylight hours from ERA5 cloud cover. December is the cloudiest, at 33%. The annual cloud-cover estimate is 62% of daylight hours; it is not a measurement of sunshine duration. Fairfield is sunnier than 89% of the US.
Humidity peaks in December at 74% and is lowest in May at 49%.
Fairfield has about 56 days a year above 90°F. Fairfield is hotter than 73% of the US.
See where Fairfield ranks: sunniest cities in the US, cloudiest cities in the US, hottest cities in the US.
First and last freeze in Fairfield
The first fall freeze in Fairfield typically comes around December 2, and the last spring freeze around February 4. That leaves a frost-free growing season of about 301 days.
Fairfield weather records
These records cover FAIRFIELD during 1970–2026. Earlier records or other stations in the city may differ.
The hottest temperature on record at the Fairfield station is 114°F, on July 24, 2006. The coldest is 15°F, on December 25, 2011.
The wettest day in the available station history brought 6.1 in of precipitation, on October 24, 2021.
39 all-time records have been set at the station since 1970.
The annual mean temperature has changed by +0.6°F per decade since 1970.
The best time to visit Fairfield
The most comfortable time to visit is typically March to May and October to November, when daytime highs sit near 72°F.
Winter (December–February) is mild, with average highs around 58°F and lows near 41°F.
Spring (March–May) is warm, with average highs around 72°F and lows near 48°F.
Summer (June–August) is hot, with average highs around 88°F and lows near 57°F.
Autumn (September–November) is warm, with average highs around 77°F and lows near 51°F.
Monthly climate
| Month | Average low | Average high | Precip | Rain days | Humidity | Estimated sunshine | Record high | Record low |
|---|---|---|---|---|---|---|---|---|
| January | 40° | 57° | 4.7 in | 10 | 72% | 34% | 78° | 18° |
| February | 43° | 62° | 5.0 in | 10 | 56% | 55% | 79° | 24° |
| March | 45° | 66° | 3.3 in | 9 | 58% | 50% | 90° | 29° |
| April | 47° | 71° | 1.5 in | 5 | 54% | 63% | 97° | 26° |
| May | 52° | 78° | 0.74 in | 3 | 49% | 71% | 111° | 35° |
| June | 55° | 85° | 0.19 in | 1 | 49% | 75% | 111° | 32° |
| July | 57° | 90° | 0.00 in | 0 | 55% | 82% | 114° | 38° |
| August | 57° | 90° | 0.03 in | 0 | 54% | 80% | 111° | 35° |
| September | 56° | 87° | 0.08 in | 1 | 54% | 79% | 114° | 39° |
| October | 52° | 79° | 1.1 in | 3 | 49% | 70% | 102° | 32° |
| November | 45° | 66° | 2.5 in | 7 | 57% | 55% | 87° | 21° |
| December | 40° | 57° | 5.4 in | 10 | 74% | 33% | 78° | 15° |
Station: FAIRFIELD, 4 km from the city. Temperature normal baseline: 1991–2020, calculated from available NOAA GHCN-Daily observations. Available station history: 1970–2026; record values refer to this station and period, not the entire city’s history. Precipitation includes rain and the water equivalent of frozen precipitation; snowfall depth is shown separately when available. Sources and methods
From ERA5 reanalysis. Sunshine is estimated from cloud cover.
Fairfield climate questions
How much rain does Fairfield get?
Fairfield gets 24.5 in of precipitation in an average year, over about 59 rainy days.
What is the wettest month in Fairfield?
December is the wettest month in Fairfield, with 5.4 in. July is the driest, with 0.0 in.
How many rainy days does Fairfield have a year?
Fairfield has about 59 days with measurable rain in an average year. January has the most, about 10.
What is the hottest month in Fairfield?
July is the warmest month in Fairfield, with an average high of 90°F.
What is the coldest month in Fairfield?
January is the coldest month in Fairfield, with an average low of 40°F.
What is the record high temperature in Fairfield?
Within the available 1970–2026 station history, the record high at the Fairfield station is 114°F, set on July 24, 2006. The record low is 15°F, on December 25, 2011.
What is the sunniest month in Fairfield?
July is the sunniest month in Fairfield, with estimated sunshine of 82% of daylight hours from ERA5 cloud cover. December is the cloudiest.
When is the first frost in Fairfield?
The first fall freeze in Fairfield typically comes around December 2. The last spring freeze is around February 4.
What is the best time to visit Fairfield?
The most comfortable time to visit is typically March to May and October to November, when daytime highs sit near 72°F.