Siena weather in March
March in Siena: cool, a little rain, with clean air — a great time to visit.
#8 of 12 months in Siena · #396 of 897 destinations to visit in March · comfort 79/100 (tier B)
Updated June 2026 · climate normals from ERA5 reanalysis
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Siena climate normals — March
| Daytime high | 14°C / 57°F | 🙂 cool |
|---|---|---|
| Nighttime low | 3°C / 37°F | |
| Rainfall | 45 mm / 1.8 in | 🌦 some rain |
| Rainy days | 6 days | |
| Humidity | 72% | 💧 humid |
| Dew point | 3°C / 37°F | |
| Sunshine | 9.6 h/day | |
| Daylight | 11.9 h | |
| Wind | 15 km/h / 9 mph | |
| Snowfall | 0.4 cm / 0.2 in | |
| Air quality (US AQI) | 39 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Siena in March — FAQ
- Is March a good time to visit Siena?
- March in Siena: cool, a little rain, with clean air — a great time to visit. It ranks #8 of 12 months for Siena on SeasonMap's comfort score (79/100).
- What is the weather like in Siena in March?
- In March, Siena averages a daily high of 13.7°C and a low of 2.9°C, with about 44.5 mm of rain over roughly 6 rainy days.
- What is the air quality in Siena in March?
- Siena has a mean US Air Quality Index of about 39 in March.