San Marcos monthly weather averages
Average daytime temperature
The bar chart below shows the average monthly peak daytime temperatures at San Marcos
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| °C | 26.1 | 27.7 | 30.1 | 31.4 | 31.4 | 30.4 | 29.7 | 29.9 | 29.8 | 28.3 | 26.6 | 26.1 |
| °F | 79 | 81.8 | 86.1 | 88.5 | 88.5 | 86.7 | 85.4 | 85.9 | 85.7 | 83 | 79.9 | 78.9 |
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 | 79 | 51 | 43 | 45 | 125 | 292 | 285 | 247 | 295 | 225 | 138 | 113 |
| inches | 3.1 | 2 | 1.7 | 1.8 | 4.9 | 11.5 | 11.2 | 9.7 | 11.6 | 8.9 | 5.4 | 4.5 |
| Rainy days | 12 | 9 | 6 | 6 | 11 | 19 | 21 | 20 | 20 | 18 | 15 | 14 |
Average annual rainfall in San Marcos: 1865.033mm (734.3 inches)
Average daily sunshine
The bar chart below shows the average daily sunshine hours in San Marcos
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Hrs sunshine | 6.5 | 6.8 | 8.2 | 7.4 | 8.6 | 7.2 | 6.9 | 7.1 | 6.1 | 6.3 | 5.5 | 6 |
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 | 17.7 | 17.7 | 18.9 | 20 | 20.8 | 21 | 20.9 | 20.9 | 20.8 | 20.1 | 19 | 18.2 |
| Max °C | 26.3 | 27.9 | 30.4 | 31.7 | 31.7 | 30.6 | 29.9 | 30.2 | 30.1 | 28.6 | 26.8 | 26.3 |
| Min °F | 63.9 | 63.9 | 65.9 | 67.9 | 69.4 | 69.8 | 69.6 | 69.5 | 69.4 | 68.1 | 66.2 | 64.7 |
| Max °F | 71.6 | 73 | 76.3 | 78.4 | 79.2 | 78.4 | 77.7 | 77.9 | 77.7 | 75.7 | 73.2 | 72 |
Sea temperature
The graph below shows the average sea temperature.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| °C | 27.2 | 27.2 | 27.6 | 28.3 | 28.9 | 29.3 | 29.2 | 29.5 | 29.6 | 29.4 | 28.7 | 27.8 |
| °F | 81 | 81 | 81.6 | 83 | 84 | 84.7 | 84.5 | 85 | 85.3 | 84.9 | 83.6 | 82.1 |
Wind speed
The graph below shows the average wind speed.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| km/h | 18 | 20 | 21 | 21 | 20 | 19 | 20 | 19 | 18 | 17 | 17 | 17 |
| mph | 11 | 12 | 13 | 13 | 13 | 12 | 12 | 12 | 11 | 11 | 11 | 11 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 82% | 80% | 73% | 79% | 74% | 82% | 84% | 82% | 86% | 84% | 87% | 84% |
Other monthly averages
San Marcos weather stats
| Hottest month: | May | 31.4°C 88.5°F |
|---|---|---|
| Driest month: | March | 43mm 1.7ins |
| Sunniest month: | March | 8.2hrs |
| Coldest month: | January | 26.1°C 79°F |
| Wettest month: | September | 295mm 11.6ins |
| Warmest sea: | September | 29.6°C 85.3°F |
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