Climate

Norwalk weather by month

Average highs, lows, rain and snow for every month, from 30 years of weather records.

Average temperatures

Best time to visit: May, June, July, when highs are mild and rain is lightest.

Month	High	Low	Rain	Wet days
January	69°F	46°F	2.9 in	5
February	69°F	48°F	3.0 in	7
March	71°F	52°F	1.7 in	5
April	74°F	54°F	0.60 in	4
May	76°F	58°F	0.30 in	2
June	79°F	63°F	0.10 in	1
July	84°F	66°F	0.00 in	0
August	87°F	66°F	0.00 in	0
September	85°F	65°F	0.10 in	1
October	80°F	58°F	0.50 in	3
November	74°F	51°F	0.70 in	5
December	68°F	46°F	1.9 in	6

NOAA U.S. Climate Normals 1991–2020, Fullerton Muni Ap, Ca Us (6.5 mi away, 96 ft). Wet days: days with at least 0.01 in of precipitation.

What is the hottest month in Norwalk?

August, with an average high of 87°F and low of 66°F.

What is the coldest month in Norwalk?

December, with an average low of 46°F and high of 68°F.

When does it rain most in Norwalk?

February is the wettest month, averaging 3.0 in of precipitation; the year totals about 11.8 inches.

What is the best time to visit Norwalk?

For mild weather (highs between 65°F and 85°F) with the least rain, May, June, July.

Where do these numbers come from?

NOAA’s 1991–2020 U.S. Climate Normals for the Fullerton Muni Ap weather station, 6.5 miles from downtown: 30-year averages, not a forecast.