Siena Weather in September

Complete weather guide for September in Siena

Siena City

September Month

26°C Avg Temp

70mm Rainfall

Weather Overview

Average conditions for Siena in September

Average High

26°C

79°F

Average Low

14°C

57°F

Precipitation

70mm

6 rainy days

Sunshine

sunny days

Humidity

66%

UV Index

Sunshine Hours

8h/day

What to Pack

Packing recommendations for September

Layers are key for Siena in September. Mornings and evenings can be cool (around "14"°C), while afternoons warm up nicely. Bring a light jacket, comfortable walking shoes, and an umbrella just in case.

Mix of summer and light layers, swimwear, light jacket for evenings.

Compare All Months

See weather patterns throughout the year in Siena

Jan

9°

1°

Feb

11°

2°

Mar

14°

4°

Apr

18°

7°

May

23°

11°

Jun

27°

15°

Jul

31°

18°

Aug

31°

18°

Sep

26°

14°

Oct

20°

10°

Nov

14°

5°

Dec

10°

2°

Planning Your Trip?

Compare crowds, prices, and events for each month to find the perfect time to visit Siena.

Best Time to Visit Siena