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 | 30.5 | 28.9 | 26.8 | 23.5 | 20 | 16.1 | 17 | 20.1 | 23.3 | 26.6 | 28.8 | 30.6 |
| °F | 87 | 84 | 80.3 | 74.4 | 68 | 60.9 | 62.6 | 68.2 | 73.9 | 80 | 83.8 | 87 |
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 | 109 | 91 | 87 | 42 | 19 | 14 | 10 | 13 | 17 | 37 | 57 | 77 |
| inches | 4.3 | 3.6 | 3.4 | 1.6 | 0.7 | 0.5 | 0.4 | 0.5 | 0.7 | 1.5 | 2.2 | 3 |
| Rainy days | 11 | 10 | 9 | 5 | 3 | 2 | 2 | 2 | 3 | 4 | 6 | 9 |
Average annual rainfall in San Antonio: 476.967mm (187.8 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 | 9.8 | 8.9 | 8.8 | 8.3 | 7.7 | 7.1 | 8.6 | 9.3 | 9.7 | 9.6 | 10 | 10.2 |
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 | 17.4 | 16.4 | 14.5 | 10.4 | 6.3 | 2.2 | 1.2 | 3.5 | 7.6 | 12 | 14.9 | 16.9 |
| Max °C | 30.9 | 29.2 | 27.2 | 23.9 | 20.4 | 16.4 | 17.4 | 20.5 | 23.7 | 27 | 29.1 | 30.9 |
| Min °F | 63.2 | 61.5 | 58 | 50.6 | 43.3 | 36 | 34.2 | 38.3 | 45.6 | 53.6 | 58.8 | 62.4 |
| Max °F | 75.4 | 73 | 69.4 | 62.8 | 55.9 | 48.7 | 48.7 | 53.6 | 60.1 | 67.1 | 71.6 | 75 |
Sea temperature
The graph below shows the average sea temperature.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| °C | 21.1 | 21.5 | 20.9 | 19.4 | 18 | 16.7 | 15.6 | 15.3 | 15.6 | 16.5 | 17.7 | 19.4 |
| °F | 69.9 | 70.8 | 69.6 | 67 | 64.4 | 62 | 60.2 | 59.5 | 60.1 | 61.7 | 63.9 | 66.9 |
Wind speed
The graph below shows the average wind speed.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| km/h | 9 | 9 | 9 | 8 | 7 | 7 | 8 | 9 | 10 | 10 | 10 | 10 |
| mph | 6 | 5 | 5 | 5 | 5 | 4 | 5 | 5 | 6 | 7 | 7 | 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 55% | 60% | 63% | 63% | 65% | 66% | 59% | 48% | 44% | 45% | 49% | 51% |
Other monthly averages
San Antonio weather stats
| Hottest month: | January | 30.5°C 86.9°F |
|---|---|---|
| Driest month: | July | 10mm 0.4ins |
| Sunniest month: | August | 9.3hrs |
| Coldest month: | June | 16.1°C 61°F |
| Wettest month: | January | 109mm 4.3ins |
| Warmest sea: | February | 21.5°C 70.7°F |
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