Monthly climate guide
Siena weather in October
Expect mild weather in Siena in October: afternoons reach about 21°C (70°F), while nights drop to around 10°C (50°F). Around 84 mm of rain falls over the month (some rain), and skies are often cloudy. Daytime highs are 6°C cooler than September and 6°C warmer than November.
What stands out in October
- Seasonally, October counts as mid-autumn in Siena.
- Just 50 km apart, but Siena runs about 3°C warmer than Florence this month.
- It cools down fast from here: November is about 6°C cooler.
- Rain is above Siena's usual level, by about 39%.
Avg high
21°C
70°F
Avg low
10°C
50°F
Rainfall
84 mm
some rain
Humidity
77%
relative
Sky
56%
cloud · often cloudy
Siena weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 9°C / 48°F | 1°C / 34°F | 54 mm | 88% | 65% |
| February | 10°C / 50°F | 1°C / 34°F | 72 mm | 85% | 64% |
| March | 14°C / 57°F | 4°C / 38°F | 69 mm | 80% | 58% |
| April | 18°C / 65°F | 7°C / 44°F | 53 mm | 76% | 60% |
| May | 22°C / 71°F | 10°C / 50°F | 61 mm | 71% | 61% |
| June | 28°C / 83°F | 15°C / 59°F | 37 mm | 61% | 41% |
| July | 32°C / 90°F | 18°C / 65°F | 37 mm | 55% | 30% |
| August | 33°C / 91°F | 18°C / 65°F | 33 mm | 55% | 28% |
| September | 27°C / 80°F | 14°C / 58°F | 60 mm | 66% | 47% |
| October | 21°C / 70°F | 10°C / 50°F | 84 mm | 77% | 56% |
| November | 15°C / 58°F | 6°C / 43°F | 100 mm | 87% | 66% |
| December | 11°C / 51°F | 2°C / 36°F | 64 mm | 89% | 61% |
What to pack for October
- T-shirts plus a light layer for the evening
- Comfortable trainers or sandals for long walks
- A compact umbrella or packable rain jacket
- Water-resistant shoes
Is October a good time to visit Siena?
Compare the months in the chart above to find your ideal window.
Best time to visit Siena →Other Italy cities in October
Cite or embed this data
Writing about this destination? Copy a ready-made citation or embed a live widget — free, just keep the link.
Siena weather in October. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/italy/siena/october
<a href="https://weathercompare.eu/weather/italy/siena/october">Siena weather in October</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/italy/siena" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="Siena weather in October"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/italy/siena/october">Siena weather in October</a> – WeatherCompare</p>
Siena in October: quick answers
Is October a good time to visit Siena?
October is a reasonable time for Siena: highs around 21°C and about 84 mm of rain, though not one of the three best months.
How warm is Siena in October?
Average highs are about 21°C (70°F) and average lows about 10°C (50°F), based on 10 years of daily data.
Does it rain a lot in Siena in October?
Siena typically gets around 84 mm of rain in October — some rain.
Figures are long-term averages for the area around Siena (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.