San Mateo monthly weather averages
Average daytime temperature
The bar chart below shows the average monthly peak daytime temperatures at San Mateo
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| °C | 16.8 | 18 | 19.4 | 21.6 | 22.2 | 20.6 | 19.9 | 20 | 19.6 | 18.8 | 18.8 | 17.6 |
| °F | 62.2 | 64.4 | 66.9 | 70.8 | 72 | 69 | 67.7 | 68.1 | 67.2 | 65.8 | 65.8 | 63.7 |
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 | 0 | 1 | 4 | 30 | 97 | 173 | 120 | 131 | 156 | 78 | 18 | 0 |
| inches | 0 | 0.1 | 0.1 | 1.2 | 3.8 | 6.8 | 4.7 | 5.2 | 6.2 | 3.1 | 0.7 | 0 |
| Rainy days | 4 | 4 | 4 | 8 | 16 | 24 | 23 | 22 | 24 | 18 | 8 | 5 |
Average annual rainfall in San Mateo: 732.534mm (288.4 inches)
Average daily sunshine
The bar chart below shows the average daily sunshine hours in San Mateo
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Hrs sunshine | 8.9 | 8.1 | 9.2 | 9.5 | 7.8 | 7.1 | 6.8 | 6.6 | 5.8 | 6.8 | 6.5 | 5.8 |
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 | 2.5 | 3.3 | 4.9 | 7.7 | 9.9 | 10.6 | 9.7 | 9.3 | 9.6 | 8.4 | 6.8 | 4.1 |
| Max °C | 17.1 | 18.4 | 19.8 | 21.9 | 22.5 | 20.8 | 20.1 | 20.3 | 19.8 | 19.1 | 19.1 | 18 |
| Min °F | 36.5 | 37.9 | 40.7 | 45.9 | 49.8 | 51.1 | 49.5 | 48.7 | 49.3 | 47 | 44.2 | 39.3 |
| Max °F | 49.6 | 51.4 | 54.1 | 58.6 | 61.2 | 60.3 | 58.8 | 58.6 | 58.5 | 56.7 | 55.2 | 51.8 |
Sea temperature
The graph below shows the average sea temperature.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| °C | 28.1 | 28 | 28.6 | 29.6 | 30.1 | 29.8 | 29.7 | 29.9 | 29.5 | 29.2 | 29.1 | 28.7 |
| °F | 82.5 | 82.5 | 83.4 | 85.3 | 86.1 | 85.6 | 85.5 | 85.7 | 85.1 | 84.5 | 84.4 | 83.7 |
Wind speed
The graph below shows the average wind speed.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| km/h | 10 | 11 | 11 | 10 | 9 | 9 | 9 | 9 | 8 | 10 | 11 | 11 |
| mph | 6 | 7 | 7 | 6 | 6 | 5 | 6 | 5 | 5 | 6 | 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 65% | 71% | 64% | 62% | 75% | 79% | 82% | 82% | 84% | 78% | 80% | 84% |
Other monthly averages
San Mateo weather stats
| Hottest month: | May | 22.2°C 72°F |
|---|---|---|
| Driest month: | January | 0mm 0ins |
| Sunniest month: | January | 8.9hrs |
| Coldest month: | January | 16.8°C 62.2°F |
| Wettest month: | June | 173mm 6.8ins |
| Warmest sea: | May | 30.1°C 86.2°F |
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