The best times to visit Vacaville for ideal weather are

April 9th to June 3rd


September 3rd to November 4th

based on average temperature and humidity from NOAA (the National Oceanic and Atmospheric Administration). Read below for more weather and travel details.



Other Vacaville Travel Info

Weather in Vacaville


Average temperatures in Vacaville vary greatly. Considering humidity, temperatures feel nice most of the year, excluding some cold weeks in the winter, with a very low chance of rain or snow throughout the year. The area is somewhat temperate — in the 52nd percentile for pleasant weather — compared to tourist destinations worldwide. Weeks with ideal weather are listed above. If you’re looking for the very warmest time to visit Vacaville, the hottest months are July, August, and then June. See average monthly temperatures below. The warmest time of year is generally early July where highs are regularly around 96.9°F (36.1°C) with temperatures rarely dropping below 60.9°F (16.1°C) at night.

Vacaville Temperatures (Fahrenheit)


Vacaville Temperatures (Celsius)


“Feels-Like” Temperatures

The way we experience weather isn’t all about temperature. Higher temperatures affect us much more at higher humidity, and colder temperatures feel piercing with high winds. Our perceived temperatures factor in humidity and wind chill to better represent how hot or cold the day feels to a person.

Vacaville Perceived Temperature (F)


Vacaville Perceived Temperature (C)



Average Vacaville Temperatures by Month

Daily highs (averaged for the month) usually give the best indication of the weather. A significantly lower mean and low generally just means it gets colder at night.

Show Fahrenheit

Month Avg. High (°F) Avg. Mean (°F) Avg. Low (°F)
Jan 60.1 46.7 36.1
Feb 63.8 51.3 41
Mar 69.5 56.2 44.7
Apr 75 60.2 47
May 82 66.3 51.9
Jun 90.4 73.1 57.3
Jul 95.5 76.2 59.7
Aug 94.6 75.2 58.7
Sep 91.9 72.9 56.2
Oct 80.7 64.7 50.8
Nov 68 54.3 42.8
Dec 58.4 47.2 38

Show Celsius

Month Avg. High (°C) Avg. Mean (°C) Avg. Low (°C)
Jan 15.6 8.2 2.3
Feb 17.7 10.7 5
Mar 20.8 13.4 7.1
Apr 23.9 15.7 8.3
May 27.8 19.1 11.1
Jun 32.4 22.8 14.1
Jul 35.3 24.6 15.4
Aug 34.8 24 14.8
Sep 33.3 22.7 13.4
Oct 27.1 18.2 10.4
Nov 20 12.4 6
Dec 14.7 8.4 3.3



Precipitation (Rain or Snow)

If dry weather is what you’re after, the months with the lowest chance of significant precipitation in Vacaville are July, August, and then June. Note that we define “significant precipitation” as .1 inches or more in this section. The lowest chance of rain or snow occurs around early to mid June. For example, on the week of June 11th there are no days of precipitation on average. By contrast, it’s most likely to rain or snow in early February with an average of 2 days of significant precipitation the week of February 5th.

When can you find snow in Vacaville? Weather stations report no annual snow. Please note that a value of 0 for snow in the graph below may either mean there was no snow, or that snow is unreported.

Chance of Precipitation

The graph below shows the % chance of rainy and snowy days in Vacaville.

Days with precipitation

Snow on the Ground

The graph below shows the average snow on the ground in Vacaville (in).

Snow depth

Average Rain and Snow by Month

Show Inches

Month Daily Chance of Rain Average Snow Depth (in) Total Precipitation (in)
Jan 14% 0 2.7
Feb 23% 0 3.5
Mar 13% 0 2.5
Apr 10% 0 1.4
May 4% 0 0.4
Jun 1% 0 0.2
Jul 0% 0 0
Aug 0% 0 0
Sep 2% 0 0.1
Oct 7% 0 1.4
Nov 11% 0 1.7
Dec 22% 0 4.2

Show Centimeters

Month Daily Chance of Rain Average Snow Depth (cm) Total Precipitation (cm)
Jan 14 0 6.9
Feb 23 0 8.9
Mar 13 0 6.4
Apr 10 0 3.6
May 4 0 1
Jun 1 0 0.5
Jul 0 0 0
Aug 0 0 0
Sep 2 0 0.3
Oct 7 0 3.6
Nov 11 0 4.3
Dec 22 0 10.7


Humidity and Wind

Vacaville has some humid months, and slightly dry months in the opposite season. The least humid month is September (33% relative humidity), and the most humid month is December (64.1%).

Wind in Vacaville is usually calm. The windiest month is May, followed by July and June. May’s average wind speed of around 6.4 knots (7.4 MPH or 11.9 KPH) is considered “a light breeze.” Maximum sustained winds (the highest speed for the day lasting more than a few moments) are at their highest in late May where average top sustained speeds reach 14.3 knots, which is considered a moderate breeze.

Relative Humidity (%)

The graph below shows the average % humidity by month in Vacaville.

Avg. Relative Humidity


The graph below shows wind speed (max and average) in knots.

Max Sustained Wind
Average Daily Wind

Average Wind Speeds

Show Wind Speeds

All wind speeds are in knots. 1 knot = 1.15 MPH or 1.85 KPH.

Month Avg. Wind Avg. Wind Feel Sustained High Wind High Wind Feel
Jan 2.9 Barely noticeable 8.3 Gentle breeze
Feb 4.3 Light breeze 10.6 Gentle breeze
Mar 5 Light breeze 11.5 Gentle breeze
Apr 5.5 Light breeze 12.7 Significant breeze
May 6.4 Light breeze 13.4 Gentle breeze
Jun 6.2 Light breeze 13.1 Significant breeze
Jul 6.2 Light breeze 12 Gentle breeze
Aug 5.6 Light breeze 11.6 Significant breeze
Sep 4.3 Light breeze 10.4 Gentle breeze
Oct 3.9 Barely noticeable 9.9 Gentle breeze
Nov 3.3 Barely noticeable 8.7 Gentle breeze
Dec 3.5 Barely noticeable 9.2 Gentle breeze

Show Relative Humidity by Month

Month Avg. Relative Humidity
Jan 61.8%
Feb 59.5%
Mar 50.2%
Apr 42.3%
May 36.7%
Jun 33.8%
Jul 33.7%
Aug 34.1%
Sep 33%
Oct 41.4%
Nov 55%
Dec 64.1%


Is it Safe to Travel to Vacaville?

Our best data indicates this area is generally safe. As of Oct 07, 2019 there are no travel advisories or warnings for the United States; exercise normal security precautions. Check this page for any recent changes or regions to avoid: Travel Advice and Advisories. This advisory was last updated on Sep 23, 2019.


The Busiest and Least Crowded Months

The busiest month for tourism in Vacaville, CA, US is July, followed by June and August. Prices for hotels and flights will be most expensive during these months, though you can save if you purchase well in advance. Tourists are unlikely to visit Vacaville in December. Those willing to visit at these times will likely find it the least expensive month.

Estimated Tourism by Month


Most Popular Months to Visit

Tourists Seeking Accommodations

Tourism graph is based on Google searches for services used by tourists relative to the rest of the year. Tourism data for this area is slightly extrapolated based on nearby areas. Displayed data is calculated relative to the peak, so a score of 36.3 in December means 36.3% of the tourists vs. July.



Overall Vacaville Travel Experience by Season

Spring (March through May)

Humidity and temperatures combine to make this season feel moderate. Highs range from 84°F (28.9°C) and 64.3°F (17.9°C) with warmer temperatures in the later months. Rain is rare with 1 to 4 days of significant precipitation per month. Spring is the second busiest for tourism, which makes it a good time for those looking for things to do.

Summer (June through August)

The middle-year months have very comfortable weather with high temperatures that are quite warm. These months see the least precipitation with about 0 days of precipitation per month. June – August is the busiest season for tourism in Vacaville, so lodging and other accommodations may cost more than usual.

Fall (September through November)

Fall daily highs range from 94.4°F (34.7°C) and 62.8°F (17.1°C), which will feel very nice given the humidity and wind. It rains or snows a normal amount: 0 to 3 days per month. Tourism is the slowest during these months due to the weather, so hotels may be affordably priced.

Winter (December through February)

Weather is too cold this time of year in Vacaville to be enjoyable for warm weather travelers. The average high during this season is between 65.1°F (18.4°C) and 57.2°F (14°C). On average, it rains or snows a fair amount: 4 to 7 times per month. These times of year are fairly slow with tourists.


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