When to go to Siena
April–June and September–October are mild. July–August is hot and busy, with the Palio on 2 July and 16 August; winters are cold but quiet.
Siena weather by month
Average daily high, rainfall and conditions.
- Jan8°58 mm
- Feb9°64 mm
- Mar13°62 mm
- Apr17°54 mm
- May22°58 mm
- Jun28°37 mm
- Jul32°30 mm
- Aug31°36 mm
- Sep25°66 mm
- Oct20°82 mm
- Nov14°102 mm
- Dec9°78 mm
Monthly averages
| Month | High | Low | Rain | Humidity | Conditions |
|---|---|---|---|---|---|
| January | 8°C46°F | 0°C32°F | 58 mm | 89% | Cold |
| February | 9°C48°F | 0°C33°F | 64 mm | 85% | Cold |
| March | 13°C56°F | 3°C37°F | 62 mm | 81% | Cool |
| April | 17°C63°F | 6°C43°F | 54 mm | 77% | Cool |
| May | 22°C72°F | 10°C51°F | 58 mm | 71% | Pleasant |
| June | 28°C83°F | 15°C59°F | 37 mm | 61% | Pleasant |
| July | 32°C89°F | 18°C64°F | 30 mm | 54% | Pleasant |
| August | 31°C88°F | 18°C64°F | 36 mm | 57% | Pleasant |
| September | 25°C78°F | 13°C56°F | 66 mm | 66% | Pleasant |
| October | 20°C68°F | 9°C49°F | 82 mm | 78% | Pleasant |
| November | 14°C56°F | 5°C41°F | 102 mm | 87% | Cool |
| December | 9°C48°F | 1°C34°F | 78 mm | 89% | Cold |
Best months across Italy
| Place | Best months | Warmest month |
|---|---|---|
| Rome | Apr–Jun, Sep–Oct | Jul (33°C) |
| Venice | Apr–May, Sep–Oct | Jul (29°C) |
| Florence | Apr–May, Sep–Oct | Jul (33°C) |
| Milan | Apr–Jun, Sep–Oct | Jul (30°C) |
| Amalfi Coast | May–Jun, Sep–Oct | Aug (27°C) |
| Naples | Apr–Jun, Sep–Oct | Jul (33°C) |
| Lake Como | Apr–Jun, Sep–Oct | Jul (28°C) |
| Cinque Terre | Apr–Jun, Sep–Oct | Aug (25°C) |
| Sicily | Apr–Jun, Sep–Oct | Aug (32°C) |
| Tuscany | Apr–Jun, Sep–Oct | Jul (33°C) |
| Positano | May–Jun, Sep–Oct | Aug (26°C) |
| Sardinia | May–Jun, Sep–Oct | Aug (28°C) |
| Bologna | Apr–Jun, Sep–Oct | Jul (34°C) |
| Verona | Apr–Jun, Sep–Oct | Jul (31°C) |
| Pisa | Apr–Jun, Sep–Oct | Jul (31°C) |
| Capri | May–Jun, Sep–Oct | Aug (26°C) |
| Sorrento | May–Jun, Sep–Oct | Aug (27°C) |
| Lake Garda | May–Jun, Sep | Jul (31°C) |
| Turin | Apr–Jun, Sep–Oct | Jul (30°C) |
| Siena | Apr–Jun, Sep–Oct | Jul (32°C) |
| Puglia | May–Jun, Sep–Oct | Jul (32°C) |
| Dolomites | Jan–Mar, Jul, Sep | Jul (22°C) |
| Taormina | May–Jun, Sep–Oct | Aug (32°C) |
| Palermo | Apr–Jun, Sep–Oct | Aug (32°C) |
| Catania | Apr–Jun, Sep–Oct | Jul (36°C) |
| Bari | Apr–Jun, Sep–Oct | Jul (32°C) |
| Matera | Apr–Jun, Sep–Oct | Jul (30°C) |
| Lecce | Apr–Jun, Sep–Oct | Aug (30°C) |
| Genoa | Apr–Jun, Sep–Oct | Jul (31°C) |
| Lucca | Apr–Jun, Sep–Oct | Jul (32°C) |
Quick answers
What is the best month to visit Siena?
Apr–Jun, Sep–Oct. April–June and September–October are mild. July–August is hot and busy, with the Palio on 2 July and 16 August; winters are cold but quiet.
When is the rainy season in Siena?
Rain peaks in November with about 102 mm. No month averages 150 mm or more.
What is the hottest month in Siena?
July, with average highs of 32°C (89°F).
How cold does Siena get?
The coolest nights are in January, averaging 0°C (32°F).
More about Siena
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Sources
Climate averages are modelled from NASA POWER (MERRA-2) for 2001–2020 at about 50 km resolution, so coasts and valleys can differ a little. Compiled and reviewed by SoloSquare. How we compile and score this. Spotted something out of date? Tell us.