Siena weather in June
June in Siena: warm, a little rain, with clean air — one of the best months to visit.
#1 of 12 months in Siena · #126 of 897 destinations to visit in June · comfort 92/100 (tier S)
Updated June 2026 · climate normals from ERA5 reanalysis
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Siena climate normals — June
| Daytime high | 27°C / 81°F | 🌤 warm |
|---|---|---|
| Nighttime low | 16°C / 60°F | |
| Rainfall | 42 mm / 1.7 in | 🌦 some rain |
| Rainy days | 6 days | |
| Humidity | 67% | 💧 humid |
| Dew point | 15°C / 59°F | |
| Sunshine | 13.2 h/day | |
| Daylight | 15.3 h | |
| Wind | 13 km/h / 8 mph | |
| Air quality (US AQI) | 47 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Siena in June — FAQ
- Is June a good time to visit Siena?
- June in Siena: warm, a little rain, with clean air — one of the best months to visit. It ranks #1 of 12 months for Siena on SeasonMap's comfort score (92/100).
- What is the weather like in Siena in June?
- In June, Siena averages a daily high of 27.2°C and a low of 15.6°C, with about 42 mm of rain over roughly 6.4 rainy days.
- What is the air quality in Siena in June?
- Siena has a mean US Air Quality Index of about 47 in June.