Siena weather in July
July in Siena: hot, dry, with clean air — an excellent time to visit.
#4 of 12 months in Siena · #335 of 897 destinations to visit in July · comfort 86/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Siena in July
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Siena climate normals — July
| Daytime high | 31°C / 87°F | 🥵 hot |
|---|---|---|
| Nighttime low | 19°C / 66°F | |
| Rainfall | 29 mm / 1.1 in | ☀️ dry |
| Rainy days | 4 days | |
| Humidity | 59% | 🍃 comfortable |
| Dew point | 16°C / 61°F | |
| Sunshine | 13.2 h/day | |
| Daylight | 15 h | |
| Wind | 14 km/h / 9 mph | |
| Air quality (US AQI) | 45 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Siena in July — FAQ
- Is July a good time to visit Siena?
- July in Siena: hot, dry, with clean air — an excellent time to visit. It ranks #4 of 12 months for Siena on SeasonMap's comfort score (86/100).
- What is the weather like in Siena in July?
- In July, Siena averages a daily high of 30.5°C and a low of 18.8°C, with about 28.7 mm of rain over roughly 4.4 rainy days.
- What is the air quality in Siena in July?
- Siena has a mean US Air Quality Index of about 45 in July.