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 | 25.9 | 26.9 | 28.7 | 29.8 | 30.5 | 30.2 | 29.7 | 29.9 | 29.8 | 28.4 | 27.1 | 26.4 |
| °F | 78.7 | 80.4 | 83.6 | 85.6 | 86.9 | 86.3 | 85.4 | 85.9 | 85.6 | 83.2 | 80.7 | 79.4 |
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 | 166 | 129 | 88 | 62 | 90 | 167 | 168 | 161 | 186 | 253 | 285 | 231 |
| inches | 6.5 | 5.1 | 3.5 | 2.4 | 3.5 | 6.6 | 6.6 | 6.3 | 7.3 | 9.9 | 11.2 | 9.1 |
| Rainy days | 16 | 11 | 8 | 6 | 9 | 16 | 19 | 20 | 19 | 20 | 18 | 17 |
Average annual rainfall in San Antonio: 1913.3mm (753.3 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 | 7.6 | 7.8 | 9.1 | 9.9 | 9.7 | 8.1 | 7.9 | 7.6 | 7.3 | 6.6 | 6.5 | 6.9 |
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 | 17.5 | 17.5 | 18.7 | 19.8 | 21.1 | 21.4 | 20.9 | 21.1 | 21 | 20.2 | 19.2 | 18.3 |
| Max °C | 26.2 | 27.1 | 28.9 | 30 | 30.8 | 30.4 | 29.9 | 30.2 | 30 | 28.7 | 27.3 | 26.6 |
| Min °F | 63.4 | 63.5 | 65.7 | 67.6 | 69.9 | 70.5 | 69.6 | 69.9 | 69.8 | 68.3 | 66.5 | 64.9 |
| Max °F | 71.2 | 72.1 | 74.8 | 76.8 | 78.6 | 78.6 | 77.7 | 78.1 | 77.9 | 75.9 | 73.8 | 72.3 |
Sea temperature
The graph below shows the average sea temperature.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| °C | 27 | 27 | 27.3 | 28 | 28.6 | 29 | 29 | 29.3 | 29.5 | 29.2 | 28.4 | 27.6 |
| °F | 80.6 | 80.5 | 81.1 | 82.4 | 83.5 | 84.3 | 84.2 | 84.7 | 85.1 | 84.6 | 83.1 | 81.6 |
Wind speed
The graph below shows the average wind speed.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| km/h | 21 | 22 | 24 | 24 | 23 | 23 | 25 | 23 | 20 | 19 | 19 | 20 |
| mph | 13 | 14 | 15 | 15 | 14 | 14 | 16 | 14 | 13 | 12 | 12 | 12 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 75% | 74% | 67% | 64% | 68% | 78% | 80% | 80% | 80% | 83% | 83% | 79% |
Other monthly averages
San Antonio weather stats
| Hottest month: | May | 30.5°C 86.9°F |
|---|---|---|
| Driest month: | April | 62mm 2.4ins |
| Sunniest month: | April | 9.9hrs |
| Coldest month: | January | 25.9°C 78.6°F |
| Wettest month: | November | 285mm 11.2ins |
| Warmest sea: | September | 29.5°C 85.1°F |
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