Siena weather in September 2025

Expect 77°F daytime maximum temperatures in the shade with on average 7 hours of sunshine per day in Siena in September. Check more long-term weather averages for Siena in September before you book your next holiday to Tuscany in 2025/2026.

  • 77°F maximum daytime temperature in September in Siena77
    77°F max day temperature
  • 7 hours of sunshine per day
  • 9 days with some rainfall in September in Siena9
    9 days with some rainfall
  • 57°F minimum night-time temperature in September in Siena57
    57°F min night temperature
  • 12 hours of daylight per day in September in Siena12
    12 hours of daylight per day
  • No heat & humidity in September in Siena0
    No heat & humidity
  • 2.7 inches monthly rainfall in September in Siena2.7
    2.7 inches of monthly rainfall
  • UV (maximum) index 5 (Moderate) in September in Siena5
    5 (Moderate) UV index

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The September weather guide for Tuscany (Siena) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C)  |  Imperial (°F)

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More about Tuscany

How hot is it in Siena in September?

Daytime temperatures usually reach 77°F in Siena in September with no heat and humidity, falling to 57°F at night.

How sunny is it in Siena in September?

There are normally 7 hours of bright sunshine each day in Siena in September - that's 56% of daylight hours.

Does it rain in Siena in September?

There are usually 9 days with some rain in Siena in September and the average monthly rainfall is 2.7 inches.

Siena September sunrise & sunset times

Browse the sunrise and sunset times for Siena in September 2025. Select a month to view Siena sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:39 18:50
Monday, 15th September 2025 05:54 18:25
Tuesday, 30th September 2025 06:11 17:57

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