Sonoma (CA) monthly weather averages

Average daytime temperature

The bar chart below shows the average monthly peak daytime temperatures at Sonoma

Sonoma average temperature chart (Celsius) Sonoma average temperature chart (Fahrenheit)
Average monthly temperatures in Sonoma (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 13.1 15.9 17 19.2 21.9 24.9 26.7 26.7 26 23.2 17.1 13.1
°F 55.5 60.6 62.5 66.5 71.4 76.9 80.1 80 78.9 73.8 62.8 55.6

Please note: these are the average peak daytime temperatures (usually around mid-afternoon) so do not show daytime / night highs and lows. To see the daily range of temperatures have a look at the temperature max / min chart below.

Average rainfall & rainy days

The graph below shows the average rainfall and number of rainy days per month.

Sonoma monthly rainfall chart (mm) Sonoma monthly rainfall chart (inches)
Average monthly rainfall in Sonoma (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 172 125 101 49 13 5 1 3 9 44 107 139
inches 6.8 4.9 4 1.9 0.5 0.2 0.1 0.1 0.4 1.7 4.2 5.5
Rainy days 10 9 11 6 3 1 1 1 2 4 9 10

Average daily sunshine

The bar chart below shows the average daily sunshine hours in Sonoma

Sonoma average daily sunshine chart
Average daily sunshine Sonoma
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 6.1 7.8 9.3 11.2 12 12.2 12.1 11.1 10.5 9 6.5 5.6

Day / night temperatures

The graph below shows the daily range of temperatures for each month.

Sonoma average minimum / maximum temperatures (Celsius) Sonoma average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Sonoma (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C 3.1 4.9 5.4 6.1 8.2 10.3 11.1 11.4 10.8 8.6 5.6 3.5
Max °C 13.3 16.2 17.3 19.5 22.3 25.3 27.1 27.1 26.4 23.6 17.4 13.4
Min °F 37.6 40.7 41.6 43 46.7 50.5 52 52.4 51.4 47.5 42.1 38.2
Max °F 46.8 50.9 52.3 55 59.4 64 66.4 66.6 65.5 61 52.7 47.1

Sea temperature

The graph below shows the average sea temperature.

Sonoma average sea temperature chart (Celsius) Sonoma average sea temperature chart (Fahrenheit)
Average sea temperature around Sonoma in degrees centigrade and fahrenheit
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 12.1 12 11.9 11.7 11.8 12.2 13.1 14 14.4 14 13.4 12.6
°F 53.8 53.6 53.5 53.1 53.2 54 55.5 57.2 57.9 57.3 56.1 54.6

Wind speed

The graph below shows the average wind speed.

Sonoma average winspeed by month (km/h) Sonoma average winspeed by month (mph)
Average wind speed in Sonoma (mph and kmh)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
km/h 12 14 16 17 19 19 18 17 15 13 12 12
mph 7 9 10 11 12 12 11 11 9 8 7 7

A monthly average windspeed of over 16km/h or 10mph suggests a location is fairly windy.

Relative humidity

The graph below shows the average relative humidity.

Sonoma relative humidity averages
Average relative humidity in Sonoma
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
80% 77% 73% 69% 67% 65% 65% 67% 66% 69% 76% 81%
Sonoma

Other monthly averages

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Sonoma weather stats

Sonoma weather statistics
Hottest month: August 26.7°C 80.1°F
Driest month: July 1mm 0ins
Sunniest month: April 11.2hrs
Coldest month: January 13.1°C 55.6°F
Wettest month: January 172mm 6.8ins
Warmest sea: September 14.4°C 57.9°F
Map showing location of Sonoma (38.29186, -122.45804)

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