Seasonal Weather Patterns in San Mateo, CA
Temperature
Average Daily Temperature (°F)
| San Mateo, CA | U.S. Avg. | Difference | |
|---|---|---|---|
| January | 54 | 43 | +11 |
| July | 66 | 79 | -13 |
Average Monthly Number of Hot and Freezing Days
| San Mateo, CA | U.S. Avg. | Difference | |
|---|---|---|---|
| Summer: Hot Days | 2 | 11 | -9 |
| Winter: Freezing Days | 2 | 12 | -10 |
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Sunshine
Average Annual Number of Clear and Cloudy Days
| San Mateo, CA | U.S. Avg. | Difference | |
|---|---|---|---|
| Clear Days | 289 | 217 | +72 |
| Cloudy Days | 76 | 148 | -72 |
Average Daylight Hours per Day
| San Mateo, CA | U.S. Avg. | Difference | |
|---|---|---|---|
| January | 10 | 10 | No difference |
| July | 15 | 15 | No difference |
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Precipitation
Average Annual Number of Rainy and Snow Days
| San Mateo, CA | U.S. Avg. | Difference | |
|---|---|---|---|
| Rainy Days | 72 | 79 | -7 |
| Snow Days | 0 | 7 | -7 |
Average Monthly Humidity (%) in San Mateo, CA
| San Mateo, CA | U.S. Avg. | Difference | |
|---|---|---|---|
| January | 76 | 68 | +8% |
| July | 69 | 61 | +8% |
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