Norwalk weather by month
Average highs run from 69°F in January to 84°F in July, and January nights average 46°F. It gets 12 inches of rain and melted snow a year, with almost no snow. Expect about 39 days a year at 90°F or hotter. The most comfortable months are September to July.
Best time to visit Norwalk
For comfortable weather, go in September to July. 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 | 69°F | 46°F | 2.9 in | 0.0 in | 3 | 0 | 0 | mild |
| February | 69°F | 48°F | 3.0 in | 0.0 in | 5 | 1 | 0 | mild |
| March | 71°F | 52°F | 1.7 in | 0.0 in | 2 | 1 | 0 | mild |
| April | 74°F | 54°F | 0.6 in | 0.0 in | 2 | 2 | 0 | mild |
| May | 76°F | 58°F | 0.3 in | 0.0 in | 1 | 2 | 0 | mild |
| June | 79°F | 63°F | 0.1 in | 0.0 in | 0 | 2 | 0 | warm |
| July | 84°F | 66°F | 0.0 in | 0.0 in | 0 | 6 | 0 | warm |
| August | 87°F | 66°F | 0.0 in | 0.0 in | 0 | 9 | 0 | warm |
| September | 85°F | 65°F | 0.1 in | 0.0 in | 0 | 9 | 0 | warm |
| October | 80°F | 58°F | 0.5 in | 0.0 in | 1 | 6 | 0 | warm |
| November | 74°F | 51°F | 0.7 in | 0.0 in | 2 | 2 | 0 | mild |
| December | 68°F | 46°F | 1.9 in | 0.0 in | 3 | 0 | 0 | mild |
| Year | 76°F avg | 56°F avg | 11.9 in | 0.0 in | 19 | 39 | 0 |
"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 Fullerton Municipal Airport, CA (USW00003166), 6.3 miles from the city center; snowfall from San Gabriel Fire Dept, CA. Averages describe typical conditions, not a forecast.
Sunrise, sunset and daylight in Norwalk
The shortest day is December 21, with 9h 53m of daylight; the longest is June 21, with 14h 24m. The earliest sunset comes around December 2 (4:42 pm) and the latest around June 26 (8:07 pm). The sun sets after 8 pm on 47 days a year.
| On the 15th of | Sunrise | Sunset | Daylight |
|---|---|---|---|
| January | 6:57 am | 5:06 pm | 10h 09m |
| February | 6:36 am | 5:36 pm | 11h 00m |
| March | 7:02 am | 7:00 pm | 11h 57m |
| April | 6:21 am | 7:23 pm | 13h 02m |
| May | 5:51 am | 7:46 pm | 13h 55m |
| June | 5:41 am | 8:04 pm | 14h 24m |
| July | 5:52 am | 8:03 pm | 14h 11m |
| August | 6:14 am | 7:38 pm | 13h 24m |
| September | 6:35 am | 6:58 pm | 12h 22m |
| October | 6:57 am | 6:17 pm | 11h 20m |
| November | 6:25 am | 4:48 pm | 10h 24m |
| December | 6:50 am | 4:44 pm | 9h 54m |
Calculated for 2026 at the center of Norwalk 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 Norwalk getting warmer?
The last 10 years averaged 3.0°F warmer than the 20th century. See the climate stripes for Norwalk.Frequently asked questions
What is the warmest month in Norwalk?
August is the warmest month, with an average high of 87°F and an average low of 66°F (NOAA 1991-2020 normals).
What is the coldest month in Norwalk?
December is the coldest, with average lows of 46°F and highs of 68°F.
What is the rainiest month in Norwalk?
February gets the most precipitation, 3.0 inches on average. July is the driest at 0.0 inches.
Does it snow in Norwalk?
Very little. The normal yearly snowfall is under one inch.
When is the best time to visit Norwalk?
For comfortable weather, September to July. Those months average highs between 62 and 86°F with lows of 42°F or more and modest rain.
Thinking of moving to Norwalk?
See what homes, rent and everyday prices cost, who lives there and how it compares with nearby cities on the full Norwalk profile.
Compare the weather: Norwalk vs Downey, Norwalk vs Lakewood, Norwalk vs Buena Park, Norwalk vs Whittier.