Siena weather in October
October in Siena: nice, rainy, with clean air — an excellent time to visit.
#6 of 12 months in Siena · #341 of 897 destinations to visit in October · comfort 83/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Siena in October
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Siena climate normals — October
| Daytime high | 20°C / 68°F | 😎 nice |
|---|---|---|
| Nighttime low | 11°C / 51°F | |
| Rainfall | 87 mm / 3.4 in | 🌧 rainy |
| Rainy days | 8 days | |
| Humidity | 77% | 💦 very humid |
| Dew point | 13°C / 55°F | |
| Sunshine | 8.5 h/day | |
| Daylight | 11 h | |
| Wind | 13 km/h / 8 mph | |
| Air quality (US AQI) | 37 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Siena in October — FAQ
- Is October a good time to visit Siena?
- October in Siena: nice, rainy, with clean air — an excellent time to visit. It ranks #6 of 12 months for Siena on SeasonMap's comfort score (83/100).
- What is the weather like in Siena in October?
- In October, Siena averages a daily high of 20°C and a low of 10.8°C, with about 86.8 mm of rain over roughly 8.2 rainy days.
- What is the air quality in Siena in October?
- Siena has a mean US Air Quality Index of about 37 in October.