Siena Weather in September
24.4°C high · 14.1°C low · 65 mm rain · 7h sun
Sep is a warm month in Siena — not peak season, but a good time to avoid crowds.
September at a glance
| Metric | Value |
|---|---|
| Average high | 24.4°C |
| Average low | 14.1°C |
| Rainfall | 65 mm |
| Sunshine | 7 hours/day |
| Daylight | 12.3 hours |
What to pack in September
Pack comfortable clothes with a light layer for evenings for Siena in September.
Siena weather by month
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Frequently asked questions
What is the weather in Siena in September?
Highs of 24.4°C and lows of 14.1°C, with about 65 mm of rain and 7 hours of sunshine per day.
Is September a good time to visit Siena?
Sep is a warm month in Siena — not peak season, but a good time to avoid crowds.
What to do in Siena · Best time to visit Siena
Climate data: Open-Meteo Historical (ERA5), 1991–2020. CC BY 4.0.