Santa Rosa (CA) monthly weather averages

Average daytime temperature

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

Santa Rosa average temperature chart (Celsius) Santa Rosa average temperature chart (Fahrenheit)
Average monthly temperatures in Santa Rosa (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 13.4 16.3 16.9 19.3 22.2 25.1 27.2 27.1 26.6 23.4 17.1 13.4
°F 56.1 61.3 62.4 66.8 72 77.1 81 80.7 79.9 74.1 62.8 56.1

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.

Santa Rosa monthly rainfall chart (mm) Santa Rosa monthly rainfall chart (inches)
Average monthly rainfall in Santa Rosa (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 182 135 114 49 13 7 2 3 12 52 123 147
inches 7.2 5.3 4.5 1.9 0.5 0.3 0.1 0.1 0.5 2.1 4.8 5.8
Rainy days 11 10 11 7 3 2 1 1 2 5 10 11

Average daily sunshine

The bar chart below shows the average daily sunshine hours in Santa Rosa

Santa Rosa average daily sunshine chart
Average daily sunshine Santa Rosa
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 6.2 7.7 9.1 11 11.7 11.9 11.8 10.8 10.2 8.8 6.4 5.6

Day / night temperatures

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

Santa Rosa average minimum / maximum temperatures (Celsius) Santa Rosa average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Santa Rosa (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C 3.2 4.9 5.5 6.4 8.3 10 10.6 10.8 10.4 8.3 5.4 3.4
Max °C 13.7 16.6 17.2 19.7 22.6 25.5 27.7 27.5 27 23.8 17.4 13.7
Min °F 37.7 40.7 41.8 43.4 46.9 49.9 51 51.4 50.7 46.9 41.7 38
Max °F 47.1 51.3 52.3 55.4 59.7 63.9 66.4 66.4 65.7 60.8 52.5 47.3

Sea temperature

The graph below shows the average sea temperature.

Santa Rosa average sea temperature chart (Celsius) Santa Rosa average sea temperature chart (Fahrenheit)
Average sea temperature around Santa Rosa 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.

Santa Rosa average winspeed by month (km/h) Santa Rosa average winspeed by month (mph)
Average wind speed in Santa Rosa (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.

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

Other monthly averages

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Santa Rosa weather stats

Santa Rosa weather statistics
Hottest month: July 27.2°C 81°F
Driest month: July 2mm 0.1ins
Sunniest month: April 11hrs
Coldest month: January 13.4°C 56.1°F
Wettest month: January 182mm 7.2ins
Warmest sea: September 14.4°C 57.9°F
Map showing location of Santa Rosa (38.44047, -122.71443)

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