Month-by-month travel weather
Siena September weather
Siena, Italy · September
T-shirt days with a light layer later
September often stays warm, but evenings start feeling cooler again. Many find walking comfort improves.
A flexible outfit plan—T-shirt by day, thin layer later—covers most days well.
September averages at a glance
Average low
around 16–18°C
Average high
around 24–27°C
Average rainfall
around 45–95 mm
Wet days
about 5–8 days
What to wear in September in Siena
Actual feel will change with wind and rain, but use the suggestions below to build a comfortable layered outfit.
- • T-shirt + thin evening layer works well.
- • Compact umbrella option helps.
- • Comfortable shoes remain essential.
Travel tips for visiting Siena in September
- • Late afternoon can feel best for longer walks.
- • After showers, watch for slick steps and paving.
September weather in Siena — FAQ
Q. Is September still hot?
A. It can be warm, but it typically eases. Day–night gaps may grow.
Q. Does rain increase in September?
A. It can be more mixed than peak summer. Patterns vary.
Explore Siena
These pages are connected so you can compare conditions and decide for yourself.