Climate in Siena: average temperature by month
In Siena the warmest month is July, with 29.7 °C on average in the afternoon; the coolest is January, with 11.3 °C.
The average of the weather stations Bastia (173 km), Riva (288 km) and Milan (294 km); nearer ones count more.
| Month | Average high | Coolest to warmest day |
|---|---|---|
| January | 11.3 °C | 11.0 °C – 11.9 °C |
| February | 12.8 °C | 11.9 °C – 13.6 °C |
| March | 15.3 °C | 13.7 °C – 16.9 °C |
| April | 18.4 °C | 16.9 °C – 20.2 °C |
| May | 22.5 °C | 20.4 °C – 24.8 °C |
| June | 27.0 °C | 24.9 °C – 29.0 °C |
| July | 29.7 °C | 29.1 °C – 30.2 °C |
| August | 29.6 °C | 27.8 °C – 30.3 °C |
| September | 25.5 °C | 23.1 °C – 27.7 °C |
| October | 20.8 °C | 18.7 °C – 22.9 °C |
| November | 15.5 °C | 13.2 °C – 18.4 °C |
| December | 12.2 °C | 11.5 °C – 13.1 °C |