Vacaville weather by month
Average highs run from 58°F in January to 95°F in July, and January nights average 38°F. It gets 25 inches of rain and melted snow a year, with almost no snow. Expect about 88 days a year at 90°F or hotter. The most comfortable months are March to May and October.
Best time to visit Vacaville
For comfortable weather, go in March to May and October. 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 | 58°F | 38°F | 5.3 in | 0.0 in | 6 | 0 | 7 | cool |
| February | 63°F | 40°F | 5.1 in | 0.0 in | 7 | 0 | 3 | mild days, chilly nights |
| March | 68°F | 43°F | 3.7 in | 0.0 in | 6 | 0 | 1 | mild |
| April | 73°F | 46°F | 1.3 in | 0.0 in | 3 | 1 | 0 | mild |
| May | 81°F | 51°F | 0.8 in | 0.0 in | 2 | 5 | 0 | warm |
| June | 90°F | 56°F | 0.2 in | 0.0 in | 0 | 15 | 0 | hot |
| July | 95°F | 59°F | 0.0 in | 0.0 in | 0 | 24 | 0 | very hot |
| August | 94°F | 58°F | 0.0 in | 0.0 in | 0 | 23 | 0 | hot |
| September | 91°F | 56°F | 0.1 in | 0.0 in | 0 | 16 | 0 | hot |
| October | 80°F | 49°F | 1.1 in | 0.0 in | 2 | 4 | 0 | warm |
| November | 67°F | 42°F | 2.3 in | 0.0 in | 4 | 0 | 2 | mild days, chilly nights |
| December | 58°F | 37°F | 5.1 in | 0.0 in | 7 | 0 | 8 | cool |
| Year | 76°F avg | 48°F avg | 24.8 in | 0.0 in | 37 | 88 | 21 |
"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 Vacaville Nut Tree Airport, CA (USW00093241), 1.8 miles from the city center; snowfall from Vacaville, CA. Averages describe typical conditions, not a forecast.
Sunrise, sunset and daylight in Vacaville
The shortest day is December 21, with 9h 29m of daylight; the longest is June 21, with 14h 50m. The earliest sunset comes around December 4 (4:46 pm) and the latest around June 22 (8:35 pm). The sun sets after 8 pm on 106 days a year.
| On the 15th of | Sunrise | Sunset | Daylight |
|---|---|---|---|
| January | 7:23 am | 5:11 pm | 9h 48m |
| February | 6:58 am | 5:46 pm | 10h 48m |
| March | 7:19 am | 7:15 pm | 11h 56m |
| April | 6:32 am | 7:44 pm | 13h 12m |
| May | 5:56 am | 8:12 pm | 14h 16m |
| June | 5:43 am | 8:33 pm | 14h 49m |
| July | 5:56 am | 8:30 pm | 14h 34m |
| August | 6:22 am | 8:01 pm | 13h 38m |
| September | 6:49 am | 7:15 pm | 12h 26m |
| October | 7:17 am | 6:29 pm | 11h 12m |
| November | 6:49 am | 4:54 pm | 10h 05m |
| December | 7:18 am | 4:48 pm | 9h 30m |
Calculated for 2026 at the center of Vacaville 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 Vacaville getting warmer?
The last 10 years averaged 2.3°F warmer than the 20th century. See the climate stripes for Vacaville.Frequently asked questions
What is the warmest month in Vacaville?
July is the warmest month, with an average high of 95°F and an average low of 59°F (NOAA 1991-2020 normals).
What is the coldest month in Vacaville?
December is the coldest, with average lows of 37°F and highs of 58°F.
What is the rainiest month in Vacaville?
January gets the most precipitation, 5.3 inches on average. July is the driest at 0.0 inches.
Does it snow in Vacaville?
Very little. The normal yearly snowfall is under one inch.
When is the best time to visit Vacaville?
For comfortable weather, March to May and October. Those months average highs between 62 and 86°F with lows of 42°F or more and modest rain.
Thinking of moving to Vacaville?
See what homes, rent and everyday prices cost, who lives there and how it compares with nearby cities on the full Vacaville profile.
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