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 | 27.8 | 28.5 | 29.5 | 29.3 | 29 | 27.6 | 27.2 | 27.7 | 28.1 | 28.3 | 28.1 | 27.7 |
| °F | 82.1 | 83.2 | 85.1 | 84.8 | 84.1 | 81.7 | 80.9 | 81.9 | 82.6 | 83 | 82.5 | 81.9 |
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 | 10 | 6 | 13 | 55 | 120 | 139 | 147 | 159 | 139 | 134 | 83 | 25 |
| inches | 0.4 | 0.2 | 0.5 | 2.2 | 4.7 | 5.5 | 5.8 | 6.2 | 5.5 | 5.3 | 3.3 | 1 |
| Rainy days | 4 | 3 | 3 | 7 | 12 | 16 | 18 | 17 | 16 | 14 | 12 | 7 |
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 | 8.4 | 8.9 | 8.6 | 6.9 | 6.4 | 6.3 | 7 | 7.2 | 7.4 | 7.2 | 7.6 | 7.9 |
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 | 14.9 | 15 | 16.2 | 18 | 18.8 | 18.6 | 18 | 17.9 | 17.9 | 17.8 | 17.1 | 16 |
| Max °C | 28.2 | 28.8 | 29.8 | 29.6 | 29.2 | 27.9 | 27.4 | 28 | 28.4 | 28.6 | 28.4 | 28 |
| Min °F | 58.7 | 59 | 61.2 | 64.4 | 65.8 | 65.4 | 64.4 | 64.1 | 64.1 | 64 | 62.7 | 60.8 |
| Max °F | 70.7 | 71.4 | 73.4 | 74.8 | 75.2 | 73.8 | 72.9 | 73.2 | 73.6 | 73.8 | 72.9 | 71.6 |
Sea temperature
The graph below shows the average sea temperature.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| °C | 25.9 | 25.5 | 25.6 | 26 | 26.6 | 26.9 | 26.9 | 27.6 | 28.2 | 28.3 | 28 | 27 |
| °F | 78.7 | 77.9 | 78 | 78.7 | 79.9 | 80.5 | 80.5 | 81.6 | 82.7 | 82.9 | 82.5 | 80.6 |
Wind speed
The graph below shows the average wind speed.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| km/h | 7 | 7 | 8 | 8 | 7 | 7 | 7 | 6 | 6 | 6 | 6 | 6 |
| mph | 4 | 5 | 5 | 5 | 5 | 5 | 4 | 4 | 4 | 4 | 4 | 4 |
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% | 71% | 68% | 72% | 76% | 78% | 81% | 81% | 81% | 81% | 80% | 77% |
Other monthly averages
San Mateo weather stats
| Hottest month: | May | 29°C 84.2°F |
|---|---|---|
| Driest month: | February | 6mm 0.2ins |
| Sunniest month: | February | 8.9hrs |
| Coldest month: | January | 27.8°C 82°F |
| Wettest month: | August | 159mm 6.3ins |
| Warmest sea: | October | 28.3°C 82.9°F |
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