Year-round weather and climate in Siena, Italy
Average temperatures in Siena run from an average low of 2°C36°F in January up to an average high of 33°C91°F in July. July is the driest month at 4 rainy days; December the wettest at 12. Here is the annual climate data, so you know what you are packing for.
Good to know
- Population
- 54K
- Currency
- EUR
- Language
- Italian
- Time zone
- Rome
Best time to visit
To avoid the most intense heat, the best time to visit is during the milder season around June, July, and August.
Rain character
Tropical Downpours: Expect intense bursts of rain during wetter months. Pack quick-drying footwear and a compact umbrella.
Day-to-night swing
The Daypack Trap: Beware the "noon illusion". In months like July, crisp sunny days drop off a cliff by 14°C25°F at sunset. Always carry an evening layer.
Seasonality Profile
Mediterranean: Hot, bone-dry summers giving way to mild, occasionally wet winters.
Evening vibe
Seasonal Terraces: During the more temperate months, the city opens up with lively outdoor terraces. For the rest of the year, expect to dine indoors.
Sightseeing stamina
Summer Heat Fatigue: Midday heat in July and August is intense. Pack high-SPF sunscreen and a wide-brimmed hat.
Average temperatures, sunshine, and rainfall
Average monthly weather in Siena, based on recent historical data. Essential insights on temperature swings, expected rainfall, and daily sunshine.
Bars span the average daily low to high. Jul is typically driest at 4 days (16mm); Dec the wettest at 12 days (109mm).
| Month | Average high | Average low | Sunshine hours | Rainy days | Total rainfall |
|---|---|---|---|---|---|
| Jan | 10°C / 50°F | 2°C / 36°F | 6h | 9 | 60mm |
| Feb | 13°C / 55°F | 4°C / 38°F | 8h | 7 | 51mm |
| Mar | 15°C / 58°F | 4°C / 40°F | 9h | 8 | 66mm |
| Apr | 18°C / 64°F | 6°C / 44°F | 11h | 10 | 71mm |
| May | 23°C / 73°F | 12°C / 53°F | 12h | 11 | 73mm |
| Jun | 28°C / 83°F | 16°C / 61°F | 13h | 7 | 56mm |
| Jul | 33°C / 91°F | 19°C / 66°F | 14h | 4 | 16mm |
| Aug | 32°C / 90°F | 19°C / 66°F | 12h | 6 | 45mm |
| Sep | 26°C / 79°F | 15°C / 59°F | 11h | 8 | 90mm |
| Oct | 21°C / 69°F | 12°C / 53°F | 9h | 9 | 113mm |
| Nov | 15°C / 59°F | 7°C / 44°F | 7h | 10 | 84mm |
| Dec | 11°C / 52°F | 4°C / 38°F | 6h | 12 | 109mm |
Weather data by Open-Meteo.com (opens in a new tab)
Frequently Asked Questions
When is the sunniest time of year to visit Siena?
The most sunshine in Siena comes around July, averaging 14 hours a month. If you're heading there then, pack your sunglasses and sunscreen.
What clothes should I pack for Siena?
Your packing list depends entirely on when you travel. Temperatures in Siena swing from an average low of 2°C36°F in January up to 33°C91°F in July. The Packola app builds a tailored packing list for you based on the live weather forecast for your exact travel dates.
Do I need to pack an umbrella for Siena?
Siena gets rain on about 101 days out of the year. The wettest month is December. If you're traveling during the rainy season, you'll definitely want to pack an umbrella and a light rain jacket.
Pack smarter.
Averages get you close, but the week you travel is what matters. Get the live forecast, a smart packing list, and discover the best local spots and activities in Siena with Packola.
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