Napa Climate: Weather by Month and Best Time to Visit
Best months for Napa: June, July, August, September.
Year at a glance
Weather by month
| Month | Avg high | Avg low | Rainfall | Rainy days | Humidity | Sunshine | Score |
|---|---|---|---|---|---|---|---|
| January | 15°C | 6°C | 116 mm | 9 | – | – | 6.5 |
| February | 17°C | 7°C | 117 mm | 9 | – | – | 6.9 |
| March | 19°C | 8°C | 86 mm | 9 | – | – | 7.4 |
| April | 22°C | 9°C | 38 mm | 5 | – | – | 8.4 |
| May | 25°C | 11°C | 20 mm | 3 | – | – | 8.6 |
| June | 29°C | 13°C | 5 mm | 1 | – | – | 9.0 |
| July | 30°C | 14°C | 0 mm | 0 | – | – | 8.9 |
| August | 30°C | 14°C | 1 mm | 0 | – | – | 8.9 |
| September | 29°C | 13°C | 2 mm | 0 | – | – | 8.9 |
| October | 25°C | 11°C | 25 mm | 3 | – | – | 8.7 |
| November | 19°C | 8°C | 55 mm | 6 | – | – | 7.8 |
| December | 15°C | 6°C | 111 mm | 9 | – | – | 6.5 |