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 | 32.5 | 31.6 | 29.6 | 26.1 | 23.4 | 20.3 | 20.8 | 22.1 | 23.7 | 26.7 | 29 | 31.5 |
| °F | 90.5 | 88.9 | 85.3 | 79 | 74 | 68.5 | 69.4 | 71.8 | 74.7 | 80.1 | 84.2 | 88.7 |
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 | 141 | 124 | 152 | 161 | 100 | 73 | 56 | 56 | 95 | 142 | 138 | 124 |
| inches | 5.5 | 4.9 | 6 | 6.4 | 3.9 | 2.9 | 2.2 | 2.2 | 3.7 | 5.6 | 5.4 | 4.9 |
| Rainy days | 8 | 8 | 8 | 8 | 6 | 7 | 6 | 6 | 7 | 8 | 9 | 7 |
Average annual rainfall in Santa Rosa: 1273.467mm (501.4 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 | 9.7 | 9.3 | 8.3 | 7.4 | 6.8 | 5.6 | 6.5 | 7.4 | 7.2 | 8.2 | 9.8 | 9.9 |
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 | 20.8 | 20.5 | 18.9 | 15.9 | 13.4 | 10.7 | 10.8 | 11.5 | 12.8 | 15.4 | 17.8 | 19.6 |
| Max °C | 32.8 | 31.9 | 29.9 | 26.4 | 23.6 | 20.5 | 21 | 22.4 | 24 | 27 | 29.3 | 31.8 |
| Min °F | 69.4 | 68.9 | 66 | 60.5 | 56.1 | 51.3 | 51.4 | 52.6 | 55 | 59.7 | 64 | 67.3 |
| Max °F | 80.2 | 79.2 | 75.9 | 70 | 65.3 | 60.1 | 60.6 | 62.4 | 65.1 | 70.2 | 74.3 | 78.3 |
Sea temperature
The graph below shows the average sea temperature.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| °C | 22.9 | 23.4 | 22.9 | 21.5 | 19.7 | 18.1 | 17 | 16.6 | 17.1 | 18.2 | 19.7 | 21.3 |
| °F | 73.3 | 74.1 | 73.2 | 70.7 | 67.5 | 64.6 | 62.5 | 62 | 62.7 | 64.8 | 67.4 | 70.4 |
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 | 11 | 10 | 10 | 12 | 12 | 13 | 14 | 13 | 13 | 12 |
| mph | 7 | 7 | 7 | 7 | 7 | 7 | 8 | 8 | 9 | 8 | 8 | 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.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 68% | 72% | 75% | 78% | 80% | 81% | 78% | 74% | 73% | 71% | 69% | 66% |
Other monthly averages
Santa Rosa weather stats
| Hottest month: | January | 32.5°C 90.5°F |
|---|---|---|
| Driest month: | August | 56mm 2.2ins |
| Sunniest month: | November | 9.8hrs |
| Coldest month: | June | 20.3°C 68.5°F |
| Wettest month: | April | 161mm 6.3ins |
| Warmest sea: | February | 23.4°C 74.1°F |
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