Siena weather in April
April in Siena: nice, a little rain, with clean air — an excellent time to visit.
#7 of 12 months in Siena · #401 of 897 destinations to visit in April · comfort 82/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
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Siena climate normals — April
| Daytime high | 16°C / 62°F | 😎 nice |
|---|---|---|
| Nighttime low | 6°C / 42°F | |
| Rainfall | 76 mm / 3 in | 🌦 some rain |
| Rainy days | 11 days | |
| Humidity | 71% | 💧 humid |
| Dew point | 5°C / 42°F | |
| Sunshine | 10.6 h/day | |
| Daylight | 13.4 h | |
| Wind | 15 km/h / 9 mph | |
| Air quality (US AQI) | 41 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Siena in April — FAQ
- Is April a good time to visit Siena?
- April in Siena: nice, a little rain, with clean air — an excellent time to visit. It ranks #7 of 12 months for Siena on SeasonMap's comfort score (82/100).
- What is the weather like in Siena in April?
- In April, Siena averages a daily high of 16.4°C and a low of 5.5°C, with about 76.3 mm of rain over roughly 10.6 rainy days.
- What is the air quality in Siena in April?
- Siena has a mean US Air Quality Index of about 41 in April.