Fairfield, CA Weather by Month and Climate Averages

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.

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. The sun is out about 34% of daylight hours. 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. The sun is out about 55% of daylight hours. 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. The sun is out about 50% of daylight hours. 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. The sun is out about 63% of daylight hours. 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. The sun is out about 71% of daylight hours. 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. The sun is out about 75% of daylight hours. 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. The sun is out about 82% of daylight hours. 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. The sun is out about 80% of daylight hours. 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. The sun is out about 79% of daylight hours. 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. The sun is out about 70% of daylight hours. 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. The sun is out about 55% of daylight hours. 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. The sun is out about 33% of daylight hours. 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 sunshine about 82% of daylight hours. December is the cloudiest, at 33%. Over the year the sun shines about 62% of daylight hours. 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

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 on record brought 6.1 in of rain, 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.

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?

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 sunshine about 82% of daylight hours. 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.