Siena Climate: Weather by Month and Best Time to Visit
Best months for Siena: July, June, August.
Year at a glance
Weather by month
| Month | Avg high | Avg low | Rainfall | Rainy days | Humidity | Sunshine | Score |
|---|---|---|---|---|---|---|---|
| January | 9°C | 2°C | 55 mm | 8 | – | – | 5.8 |
| February | 10°C | 2°C | 65 mm | 8 | – | – | 6.0 |
| March | 14°C | 4°C | 66 mm | 9 | – | – | 6.6 |
| April | 17°C | 7°C | 79 mm | 11 | – | – | 6.8 |
| May | 22°C | 11°C | 71 mm | 10 | – | – | 7.7 |
| June | 26°C | 15°C | 50 mm | 8 | – | – | 8.1 |
| July | 29°C | 17°C | 31 mm | 5 | – | – | 8.4 |
| August | 30°C | 18°C | 40 mm | 6 | – | – | 8.1 |
| September | 24°C | 14°C | 92 mm | 9 | – | – | 7.8 |
| October | 19°C | 10°C | 109 mm | 10 | – | – | 7.1 |
| November | 14°C | 6°C | 119 mm | 12 | – | – | 6.0 |
| December | 10°C | 2°C | 79 mm | 10 | – | – | 5.8 |