Guerneville (CA) monthly weather averages

Contents

Average daytime temperature

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

Guerneville average temperature chart (Celsius) Guerneville average temperature chart (Fahrenheit)
Average monthly temperatures in Guerneville (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 13.3 16.1 17.4 20 23.4 26.8 29.3 29 27.9 24.1 17.3 13.3
°F 56 61 63.2 67.9 74.2 80.2 84.8 84.1 82.3 75.3 63.2 55.9

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.

Guerneville monthly rainfall chart (mm) Guerneville monthly rainfall chart (inches)
Average monthly rainfall in Guerneville (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 234 172 144 64 15 6 2 4 14 62 166 194
inches 9.2 6.8 5.7 2.5 0.6 0.2 0.1 0.2 0.5 2.4 6.5 7.6
Rainy days 11 10 12 7 4 2 1 1 2 5 10 11

Average annual rainfall in Guerneville: 992.366mm (390.7 inches)

Average daily sunshine

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

Guerneville average daily sunshine chart
Average daily sunshine Guerneville
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 6.1 7.6 9 10.9 11.6 11.8 11.8 10.7 10.1 8.7 6.3 5.6

Day / night temperatures

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

Guerneville average minimum / maximum temperatures (Celsius) Guerneville average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Guerneville (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C 3 4.6 5.4 6.3 8.6 10.6 11.3 11.4 10.7 8.4 5.4 3.1
Max °C 13.6 16.4 17.7 20.3 23.8 27.2 29.8 29.4 28.4 24.5 17.6 13.5
Min °F 37.4 40.3 41.6 43.3 47.5 51.1 52.3 52.5 51.2 47 41.7 37.6
Max °F 46.9 50.9 52.7 55.9 61.2 66 68.9 68.7 67.1 61.5 52.7 46.9

Sea temperature

The graph below shows the average sea temperature.

Guerneville average sea temperature chart (Celsius) Guerneville average sea temperature chart (Fahrenheit)
Average sea temperature around Guerneville 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.

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

Guerneville relative humidity averages
Average relative humidity in Guerneville
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
81% 77% 74% 70% 69% 67% 67% 69% 68% 71% 78% 81%

Other monthly averages

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

Guerneville weather stats

Guerneville weather statistics
Hottest month: July 29.3°C 84.7°F
Driest month: July 2mm 0.1ins
Sunniest month: April 10.9hrs
Coldest month: January 13.3°C 55.9°F
Wettest month: January 234mm 9.2ins
Warmest sea: September 14.4°C 57.9°F
Map showing location of Guerneville (38.50186, -122.99611) Guerneville map pin © Google

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