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 | 30.3 | 30.6 | 30.9 | 30.8 | 29.8 | 28.3 | 27.5 | 27.3 | 27.7 | 27.7 | 28.6 | 29.9 |
| °F | 86.6 | 87.1 | 87.6 | 87.4 | 85.6 | 83 | 81.5 | 81.1 | 81.9 | 81.8 | 83.5 | 85.8 |
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 | 99 | 133 | 143 | 97 | 42 | 27 | 16 | 14 | 18 | 21 | 17 | 27 |
| inches | 3.9 | 5.2 | 5.6 | 3.8 | 1.6 | 1.1 | 0.6 | 0.5 | 0.7 | 0.8 | 0.7 | 1.1 |
| Rainy days | 12 | 13 | 13 | 10 | 7 | 8 | 8 | 8 | 7 | 9 | 7 | 7 |
Average annual rainfall in Santa Rosa: 569.566mm (224.2 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 | 4.3 | 4.5 | 5.2 | 5.5 | 5.3 | 4.6 | 4.2 | 4.1 | 4.1 | 4.6 | 5.5 | 5.9 |
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 | 21.7 | 22 | 22.1 | 22.2 | 21.6 | 20.7 | 19.9 | 19.3 | 19.5 | 19.8 | 19.8 | 20.9 |
| Max °C | 30.6 | 30.8 | 31.1 | 31 | 30 | 28.5 | 27.7 | 27.5 | 28 | 27.9 | 28.8 | 30.1 |
| Min °F | 71 | 71.6 | 71.8 | 72 | 70.9 | 69.3 | 67.8 | 66.7 | 67 | 67.6 | 67.6 | 69.6 |
| Max °F | 79 | 79.5 | 79.9 | 79.9 | 78.4 | 76.3 | 74.8 | 74.1 | 74.7 | 74.8 | 75.7 | 77.9 |
Sea temperature
The graph below shows the average sea temperature.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| °C | 24 | 25.2 | 25 | 24 | 23.7 | 22.7 | 21.9 | 21.3 | 21.1 | 21.6 | 21.9 | 22.8 |
| °F | 75.2 | 77.3 | 76.9 | 75.2 | 74.6 | 72.9 | 71.5 | 70.4 | 70 | 70.9 | 71.5 | 73 |
Wind speed
The graph below shows the average wind speed.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| km/h | 15 | 14 | 13 | 14 | 14 | 12 | 13 | 14 | 13 | 14 | 13 | 15 |
| mph | 9 | 9 | 8 | 9 | 9 | 8 | 8 | 9 | 8 | 9 | 8 | 9 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 83% | 83% | 83% | 84% | 85% | 86% | 86% | 86% | 86% | 86% | 84% | 83% |
Other monthly averages
Santa Rosa weather stats
| Hottest month: | March | 30.9°C 87.6°F |
|---|---|---|
| Driest month: | August | 14mm 0.6ins |
| Sunniest month: | December | 5.9hrs |
| Coldest month: | August | 27.3°C 81.1°F |
| Wettest month: | March | 143mm 5.6ins |
| Warmest sea: | February | 25.2°C 77.4°F |
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