Foster City Climate: Weather by Month and Best Time to Visit
Best months for Foster City: July, August, September, June.
Year at a glance
Weather by month
| Month | Avg high | Avg low | Rainfall | Rainy days | Humidity | Sunshine | Score |
|---|---|---|---|---|---|---|---|
| January | 14°C | 7°C | 100 mm | 9 | – | – | 6.5 |
| February | 16°C | 8°C | 107 mm | 9 | – | – | 6.7 |
| March | 17°C | 9°C | 81 mm | 9 | – | – | 7.1 |
| April | 18°C | 10°C | 42 mm | 6 | – | – | 7.7 |
| May | 19°C | 11°C | 20 mm | 3 | – | – | 8.2 |
| June | 22°C | 12°C | 4 mm | 1 | – | – | 8.9 |
| July | 23°C | 14°C | 0 mm | 0 | – | – | 9.1 |
| August | 23°C | 14°C | 1 mm | 0 | – | – | 9.1 |
| September | 24°C | 14°C | 2 mm | 0 | – | – | 9.0 |
| October | 22°C | 12°C | 23 mm | 3 | – | – | 8.7 |
| November | 17°C | 10°C | 50 mm | 6 | – | – | 7.6 |
| December | 14°C | 8°C | 94 mm | 9 | – | – | 6.6 |