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Norwalk, 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 Norwalk, CA?
Norwalk, CA gets 11.9 in of precipitation a year over about 38 rainy days. August is the warmest month (average high 87°F) and January the coldest (average low 46°F).
Semi-arid climate
Norwalk, CA has hot summers and warm winters. Daytime highs range from about 69°F in December to 87°F in August. February is usually the wettest month. The most comfortable time to visit is typically January, March to June, and November to December, when daytime highs sit near 73°F.
| Season | Months | Avg low | Avg high |
|---|---|---|---|
| Winter | Dec–Feb | 47° | 69° |
| Spring | Mar–May | 54° | 74° |
| Summer | Jun–Aug | 65° | 84° |
| Autumn | Sep–Nov | 58° | 80° |
How much rain does Norwalk get?
Norwalk gets 11.9 in of precipitation in an average year, spread over about 38 days with measurable rain. That is fewer rainy days than 89% of the US.
February is the wettest month, with 3.0 in. July is the driest, with 0.0 in. February has the most rainy days, about 7.
The longest dry spell in the last five years lasted 180 days, to November 1, 2024.
From September 2025 to August 2026 Norwalk got 16.3 in of rain, against a normal of 11.9 in for those months. November 2025 had the most, with 5.4 in.
See where Norwalk ranks: rainiest cities in the US, US cities with the most rainy days, rainiest cities in California.
Norwalk weather by month
Norwalk weather in January
In January, Norwalk averages a high of 70°F and a low of 46°F. It gets 2.9 in of precipitation over about 5 rainy days. Estimated sunshine is 54% of daylight hours, derived from ERA5 cloud cover. The January record high is 94°F (2003) and the record low is 28°F (2007). January is one of the most comfortable months to visit.
Norwalk weather in February
In February, Norwalk averages a high of 69°F and a low of 48°F. It gets 3.0 in of precipitation over about 7 rainy days. Estimated sunshine is 61% of daylight hours, derived from ERA5 cloud cover. The February record high is 94°F (2016) and the record low is 35°F (2002).
Norwalk weather in March
In March, Norwalk averages a high of 71°F and a low of 51°F. It gets 1.7 in of precipitation over about 5 rainy days. Estimated sunshine is 50% of daylight hours, derived from ERA5 cloud cover. The March record high is 100°F (2026) and the record low is 36°F (2006). March is one of the most comfortable months to visit.
Norwalk weather in April
In April, Norwalk averages a high of 74°F and a low of 54°F. It gets 0.6 in of precipitation over about 4 rainy days. Estimated sunshine is 57% of daylight hours, derived from ERA5 cloud cover. The April record high is 102°F (2022) and the record low is 39°F (1999). April is one of the most comfortable months to visit.
Norwalk weather in May
In May, Norwalk averages a high of 76°F and a low of 58°F. It gets 0.3 in of precipitation over about 2 rainy days. Estimated sunshine is 58% of daylight hours, derived from ERA5 cloud cover. The May record high is 104°F (2004) and the record low is 46°F (1999). May is one of the most comfortable months to visit.
Norwalk weather in June
In June, Norwalk averages a high of 80°F and a low of 62°F. It gets 0.1 in of precipitation over about 1 rainy days. Estimated sunshine is 66% of daylight hours, derived from ERA5 cloud cover. The June record high is 109°F (2016) and the record low is 52°F (1999). June is one of the most comfortable months to visit.
Norwalk weather in July
In July, Norwalk averages a high of 85°F and a low of 66°F. It gets 0.0 in of precipitation over about 0 rainy days. Estimated sunshine is 78% of daylight hours, derived from ERA5 cloud cover. The July record high is 116°F (2018) and the record low is 58°F (2001).
Norwalk weather in August
In August, Norwalk averages a high of 87°F and a low of 66°F. It gets 0.0 in of precipitation over about 0 rainy days. Estimated sunshine is 78% of daylight hours, derived from ERA5 cloud cover. The August record high is 107°F (2020) and the record low is 56°F (2010).
Norwalk weather in September
In September, Norwalk averages a high of 85°F and a low of 64°F. It gets 0.1 in of precipitation over about 1 rainy days. Estimated sunshine is 74% of daylight hours, derived from ERA5 cloud cover. The September record high is 113°F (2024) and the record low is 54°F (2013).
Norwalk weather in October
In October, Norwalk averages a high of 81°F and a low of 58°F. It gets 0.5 in of precipitation over about 3 rainy days. Estimated sunshine is 71% of daylight hours, derived from ERA5 cloud cover. The October record high is 107°F (2017) and the record low is 45°F (2009).
Norwalk weather in November
In November, Norwalk averages a high of 75°F and a low of 51°F. It gets 0.7 in of precipitation over about 5 rainy days. Estimated sunshine is 68% of daylight hours, derived from ERA5 cloud cover. The November record high is 99°F (2010) and the record low is 34°F (2010). November is one of the most comfortable months to visit.
Norwalk weather in December
In December, Norwalk averages a high of 69°F and a low of 46°F. It gets 1.9 in of precipitation over about 6 rainy days. Estimated sunshine is 50% of daylight hours, derived from ERA5 cloud cover. The December record high is 87°F (2017) and the record low is 31°F (1998). December is one of the most comfortable months to visit.
Sunshine, humidity and wind in Norwalk
July is the sunniest month in Norwalk, with estimated sunshine of 78% of daylight hours from ERA5 cloud cover. March is the cloudiest, at 50%. The annual cloud-cover estimate is 64% of daylight hours; it is not a measurement of sunshine duration. Norwalk is sunnier than 91% of the US.
Humidity peaks in May at 62% and is lowest in November at 41%.
Wind averages 4 mph over the year, and April is the windiest month at 4 mph.
Norwalk has about 38 days a year above 90°F. Norwalk is hotter than 60% of the US.
Thunderstorms occur on about 5 days a year.
See where Norwalk ranks: sunniest cities in the US, cloudiest cities in the US, hottest cities in the US.
Norwalk weather records
These records cover FULLERTON MUNI AP during 1998–2026. Earlier records or other stations in the city may differ.
The hottest temperature on record at the Norwalk station is 116°F, on July 6, 2018. The coldest is 28°F, on January 14, 2007.
The wettest day in the available station history brought 2.8 in of precipitation, on January 22, 2017.
The best time to visit Norwalk
The most comfortable time to visit is typically January, March to June, and November to December, when daytime highs sit near 73°F.
Winter (December–February) is warm, with average highs around 69°F and lows near 47°F.
Spring (March–May) is warm, with average highs around 74°F and lows near 54°F.
Summer (June–August) is hot, with average highs around 84°F and lows near 65°F.
Autumn (September–November) is warm, with average highs around 80°F and lows near 58°F.
Monthly climate
| Month | Average low | Average high | Precip | Rain days | Wind | Humidity | Estimated sunshine | Record high | Record low |
|---|---|---|---|---|---|---|---|---|---|
| January | 46° | 70° | 2.9 in | 5 | 3 mph | 56% | 54% | 94° | 28° |
| February | 48° | 69° | 3.0 in | 7 | 4 mph | 47% | 61% | 94° | 35° |
| March | 51° | 71° | 1.7 in | 5 | 4 mph | 59% | 50% | 100° | 36° |
| April | 54° | 74° | 0.59 in | 4 | 4 mph | 60% | 57% | 102° | 39° |
| May | 58° | 76° | 0.30 in | 2 | 4 mph | 62% | 58% | 104° | 46° |
| June | 62° | 80° | 0.08 in | 1 | 4 mph | 58% | 66% | 109° | 52° |
| July | 66° | 85° | 0.02 in | 0 | 4 mph | 55% | 78% | 116° | 58° |
| August | 66° | 87° | 0.02 in | 0 | 4 mph | 53% | 78% | 107° | 56° |
| September | 64° | 85° | 0.14 in | 1 | 3 mph | 54% | 74% | 113° | 54° |
| October | 58° | 81° | 0.50 in | 3 | 3 mph | 49% | 71% | 107° | 45° |
| November | 51° | 75° | 0.74 in | 5 | 3 mph | 41% | 68% | 99° | 34° |
| December | 46° | 69° | 1.9 in | 6 | 3 mph | 51% | 50% | 87° | 31° |
Station: FULLERTON MUNI AP, 10 km from the city. Temperature normal baseline: 1991–2020, calculated from available NOAA GHCN-Daily observations. Available station history: 1998–2026; 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.
Norwalk climate questions
How much rain does Norwalk get?
Norwalk gets 11.9 in of precipitation in an average year, over about 38 rainy days.
What is the wettest month in Norwalk?
February is the wettest month in Norwalk, with 3.0 in. July is the driest, with 0.0 in.
How many rainy days does Norwalk have a year?
Norwalk has about 38 days with measurable rain in an average year. February has the most, about 7.
What is the hottest month in Norwalk?
August is the warmest month in Norwalk, with an average high of 87°F.
What is the coldest month in Norwalk?
January is the coldest month in Norwalk, with an average low of 46°F.
What is the record high temperature in Norwalk?
Within the available 1998–2026 station history, the record high at the Norwalk station is 116°F, set on July 6, 2018. The record low is 28°F, on January 14, 2007.
What is the sunniest month in Norwalk?
July is the sunniest month in Norwalk, with estimated sunshine of 78% of daylight hours from ERA5 cloud cover. March is the cloudiest.
What is the best time to visit Norwalk?
The most comfortable time to visit is typically January, March to June, and November to December, when daytime highs sit near 73°F.