Santa Rosa monthly weather averages
Average daytime temperature
The bar chart below shows the average monthly peak daytime temperatures at Santa Rosa
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| °C | 31 | 30.4 | 29 | 25.7 | 22.5 | 20.1 | 20.4 | 22 | 23.4 | 26 | 28.2 | 30.4 |
| °F | 87.9 | 86.8 | 84.3 | 78.2 | 72.6 | 68.1 | 68.7 | 71.5 | 74.1 | 78.9 | 82.8 | 86.6 |
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.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| mm | 117 | 111 | 95 | 120 | 120 | 135 | 107 | 114 | 129 | 141 | 117 | 97 |
| inches | 4.6 | 4.4 | 3.7 | 4.7 | 4.7 | 5.3 | 4.2 | 4.5 | 5.1 | 5.6 | 4.6 | 3.8 |
| Rainy days | 13 | 13 | 12 | 10 | 10 | 11 | 11 | 12 | 12 | 12 | 11 | 11 |
Average annual rainfall in Santa Rosa: 1319.666mm (519.6 inches)
Average daily sunshine
The bar chart below shows the average daily sunshine hours in Santa Rosa
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Hrs sunshine | 8.2 | 7.6 | 7.3 | 6.6 | 6.2 | 5.1 | 5.8 | 5.7 | 5.5 | 6.9 | 7.9 | 8.7 |
Day / night temperatures
The graph below shows the daily range of temperatures for each month.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Min °C | 19.9 | 19.7 | 18.5 | 15.7 | 12 | 9.9 | 9.4 | 11.8 | 12 | 15.5 | 16.7 | 18.2 |
| Max °C | 31.3 | 30.7 | 29.3 | 25.9 | 22.8 | 20.3 | 20.7 | 22.2 | 23.7 | 26.3 | 28.5 | 30.7 |
| Min °F | 67.8 | 67.5 | 65.3 | 60.3 | 53.6 | 49.8 | 48.8 | 53.2 | 53.5 | 59.9 | 62.1 | 64.7 |
| Max °F | 78.1 | 77.4 | 75 | 69.4 | 63.3 | 59.2 | 59 | 62.6 | 64 | 69.6 | 72.7 | 75.9 |
Sea temperature
The graph below shows the average sea temperature.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| °C | 24.3 | 24.7 | 24.2 | 22.9 | 20.9 | 19.2 | 17.9 | 17.6 | 18.2 | 19.4 | 21 | 22.7 |
| °F | 75.8 | 76.5 | 75.6 | 73.1 | 69.6 | 66.5 | 64.2 | 63.7 | 64.7 | 67 | 69.8 | 72.9 |
Wind speed
The graph below shows the average wind speed.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| km/h | 11 | 11 | 10 | 10 | 10 | 12 | 13 | 13 | 13 | 13 | 13 | 12 |
| mph | 7 | 7 | 7 | 6 | 6 | 7 | 8 | 8 | 8 | 8 | 8 | 8 |
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.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 69% | 73% | 74% | 76% | 77% | 79% | 77% | 73% | 73% | 70% | 68% | 66% |
Other monthly averages
Santa Rosa weather stats
| Hottest month: | January | 31°C 87.8°F |
|---|---|---|
| Driest month: | March | 95mm 3.7ins |
| Sunniest month: | December | 8.7hrs |
| Coldest month: | July | 20.4°C 68.7°F |
| Wettest month: | October | 141mm 5.6ins |
| Warmest sea: | February | 24.7°C 76.5°F |
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