San Mateo, CA Weather
San Mateo, CA climate is mild during summer when temperatures tend to be in the 60's and cool during winter when temperatures tend to be in the 50's.
The warmest month of the year is September with an average maximum temperature of 9.99 degrees Fahrenheit, while the coldest month of the year is January with an average minimum temperature of 9.99 degrees Fahrenheit.
Temperature variations between night and day tend to be fairly limited during summer with a difference that can reach 15 degrees Fahrenheit, and fairly limited during winter with an average difference of 15 degrees Fahrenheit.
The annual average precipitation at San Mateo is 9.99 Inches. Winter months tend to be wetter than summer months. The wettest month of the year is January with an average rainfall of 4.91 Inches.
Weather Data
Normal Climate
Normal Temperatures
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Max °F | 57.1 | 60.9 | 63.2 | 66.3 | 68.3 | 70.7 | 70.5 | 71.0 | 73.4 | 71.8 | 63.6 | 57.3 | 66.2 |
| Mean °F | 50.0 | 53.2 | 55.0 | 57.4 | 59.6 | 62.2 | 62.7 | 63.5 | 64.8 | 62.5 | 55.6 | 50.2 | 58.1 |
| Min °F | 42.9 | 45.4 | 46.8 | 48.4 | 50.9 | 53.6 | 54.9 | 55.9 | 56.1 | 53.1 | 47.6 | 43.0 | 49.9 |
Normal Precipitation
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Inch | 4.91 | 4.41 | 3.52 | 1.35 | 0.54 | 0.17 | 0.07 | 0.09 | 0.27 | 1.25 | 3.47 | 3.30 | 9.99 |
