The best times to visit Sonoma Valley for ideal weather are

April 30th to October 28th

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


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Other Sonoma Valley Travel Info

Weather in Sonoma Valley

Temperature

Average temperatures in Sonoma Valley vary somewhat. Considering humidity, temperatures feel cold for about half of the year and otherwise nice 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 Sonoma Valley, the hottest months are August, September, and then July. See average monthly temperatures below. The warmest time of year is generally late August to early September where highs are regularly around 86.5°F (30.3°C) with temperatures rarely dropping below 51.8°F (11°C) at night.

Sonoma Valley Temperatures (Fahrenheit)

Key
High
Average
Low

Sonoma Valley Temperatures (Celsius)

Key
High
Average
Low

“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.

Sonoma Valley Perceived Temperature (F)

Key
High
Average
Low

Sonoma Valley Perceived Temperature (C)

Key
High
Average
Low

 

Average Sonoma Valley 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

MonthAvg. High (°F)Avg. Mean (°F)Avg. Low (°F)
Jan5946.134.9
Feb61.949.438.5
Mar65.952.340.4
Apr69.754.741.3
May7458.745.5
Jun79.763.250.1
Jul79.564.153.4
Aug80.364.253
Sep82.464.250.1
Oct76.559.645.7
Nov66.151.939.1
Dec57.546.336.3

Show Celsius

MonthAvg. High (°C)Avg. Mean (°C)Avg. Low (°C)
Jan157.81.6
Feb16.69.73.6
Mar18.811.34.7
Apr20.912.65.2
May23.314.87.5
Jun26.517.310.1
Jul26.417.811.9
Aug26.817.911.7
Sep2817.910.1
Oct24.715.37.6
Nov18.911.13.9
Dec14.27.92.4


 

Precipitation (Rain or Snow)

If dry weather is what you’re after, the months with the lowest chance of significant precipitation in Sonoma Valley are July, August, and then September. 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 Sonoma Valley? 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 Sonoma Valley.

Key
Days with precipitation

Snow on the Ground

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

Key
Snow depth

Average Rain and Snow by Month

Show Inches

MonthDaily Chance of RainAverage Snow Depth (in)Total Precipitation (in)
Jan14%02.5
Feb24%02.9
Mar13%02.2
Apr11%01.4
May5%00.4
Jun2%00.3
Jul0%00
Aug0%00
Sep1%00.2
Oct9%01.3
Nov13%01.7
Dec22%03.6

Show Centimeters

MonthDaily Chance of RainAverage Snow Depth (cm)Total Precipitation (cm)
Jan1406.4
Feb2407.4
Mar1305.6
Apr1103.6
May501
Jun200.8
Jul000
Aug000
Sep100.5
Oct903.3
Nov1304.3
Dec2209.1

 

Humidity and Wind

Sonoma Valley has some very humid months, with other comfortably humid months. The least humid month is June (58.2% relative humidity), and the most humid month is December (71.8%).

Wind in Sonoma Valley is usually calm. The windiest month is July, followed by June and May. July’s average wind speed of around 8.7 knots (10 MPH or 16.1 KPH) is considered “a gentle breeze.” Maximum sustained winds (the highest speed for the day lasting more than a few moments) are at their highest in early June where average top sustained speeds reach 17.3 knots, which is considered a fresh breeze.

Relative Humidity (%)

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

Key
Avg. Relative Humidity

Wind

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

Key
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.

MonthAvg. WindAvg. Wind FeelSustained High WindHigh Wind Feel
Jan4.9Light breeze12Significant breeze
Feb5.3Light breeze12.9Significant breeze
Mar5.8Light breeze13.9Significant breeze
Apr6.9Light breeze15.7Significant breeze
May7.9Gentle breeze16Significant breeze
Jun8.4Gentle breeze16.2Significant breeze
Jul8.7Gentle breeze15.8Significant breeze
Aug7.8Gentle breeze14.9Significant breeze
Sep6.3Light breeze13.7Significant breeze
Oct4.9Light breeze12.1Significant breeze
Nov4.4Light breeze11.2Significant breeze
Dec4.9Light breeze11.7Significant breeze

Show Relative Humidity by Month

MonthAvg. Relative Humidity
Jan69.5%
Feb70.9%
Mar67.4%
Apr62.2%
May59.4%
Jun58.2%
Jul63.6%
Aug63.7%
Sep58.5%
Oct59.8%
Nov66.4%
Dec71.8%

 

Is it Safe to Travel to Sonoma Valley?

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 Sonoma Valley, 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 Sonoma Valley 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

Key
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 Sonoma Valley Travel Experience by Season

Spring (March through May)

Humidity and temperatures combine to make this season feel moderately cold. Highs range from 75.7°F (24.3°C) and 62.4°F (16.9°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 comfortably cool weather with high temperatures that are comfortable. These months see the least precipitation with 0 to 1 days of precipitation per month. June – August is the busiest season for tourism in Sonoma Valley, so lodging and other accommodations may cost more than usual.

Fall (September through November)

Fall daily highs range from 83.6°F (28.7°C) and 62.1°F (16.7°C), which will feel comfortable given the humidity and wind. It rains or snows a normal amount: 0 to 4 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 Sonoma Valley to be enjoyable for warm weather travelers. The average high during this season is between 63.2°F (17.3°C) and 56°F (13.3°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.

 

Best Times to Travelthe United States › Sonoma Valley, CA, US


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