San Antonio monthly weather averages
Average daytime temperature
The bar chart below shows the average monthly peak daytime temperatures at San Antonio
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| °C | 23.4 | 23 | 21.2 | 18.5 | 16.1 | 14.2 | 14.1 | 15 | 16.1 | 18.1 | 20.5 | 22.5 |
| °F | 74.1 | 73.3 | 70.2 | 65.4 | 60.9 | 57.6 | 57.3 | 59 | 61 | 64.5 | 68.8 | 72.6 |
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 | 2 | 1 | 4 | 23 | 73 | 100 | 116 | 59 | 32 | 12 | 8 | 4 |
| inches | 0.1 | 0 | 0.2 | 0.9 | 2.9 | 3.9 | 4.6 | 2.3 | 1.2 | 0.5 | 0.3 | 0.1 |
| Rainy days | 2 | 3 | 2 | 2 | 3 | 4 | 4 | 3 | 3 | 3 | 2 | 2 |
Average annual rainfall in San Antonio: 326.934mm (128.7 inches)
Average daily sunshine
The bar chart below shows the average daily sunshine hours in San Antonio
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Hrs sunshine | 11.5 | 10.7 | 9.6 | 7.3 | 4.5 | 3.8 | 4.2 | 4.8 | 6 | 7.7 | 9.7 | 11.3 |
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 | 13.4 | 12.8 | 11.4 | 9.5 | 8.2 | 6.8 | 6.4 | 6.6 | 7.5 | 8.9 | 10.5 | 12.2 |
| Max °C | 23.7 | 23.2 | 21.5 | 18.8 | 16.3 | 14.4 | 14.3 | 15.2 | 16.4 | 18.3 | 20.7 | 22.8 |
| Min °F | 56 | 55 | 52.4 | 49 | 46.7 | 44.2 | 43.4 | 43.9 | 45.4 | 48 | 50.9 | 54 |
| Max °F | 65.3 | 64.4 | 61.5 | 57.4 | 54 | 51.1 | 50.5 | 51.6 | 53.4 | 56.5 | 60.1 | 63.5 |
Sea temperature
The graph below shows the average sea temperature.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| °C | 17.3 | 17.8 | 17.4 | 16.1 | 15 | 14.2 | 13.5 | 13.1 | 13.3 | 13.9 | 14.8 | 16 |
| °F | 63.1 | 64 | 63.3 | 61 | 59 | 57.6 | 56.2 | 55.6 | 55.9 | 57.1 | 58.7 | 60.8 |
Wind speed
The graph below shows the average wind speed.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| km/h | 9 | 8 | 7 | 7 | 7 | 7 | 7 | 8 | 9 | 9 | 9 | 9 |
| mph | 6 | 5 | 4 | 4 | 5 | 4 | 4 | 5 | 5 | 6 | 6 | 6 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 72% | 75% | 78% | 81% | 84% | 86% | 86% | 85% | 83% | 81% | 75% | 73% |
Other monthly averages
San Antonio weather stats
| Hottest month: | January | 23.4°C 74.1°F |
|---|---|---|
| Driest month: | February | 1mm 0ins |
| Sunniest month: | January | 11.5hrs |
| Coldest month: | July | 14.1°C 57.4°F |
| Wettest month: | July | 116mm 4.6ins |
| Warmest sea: | February | 17.8°C 64°F |
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