Siena weather in September 2025

Expect daytime maximum temperatures of 25°C in Siena, Tuscany in September based on long-term weather averages. There are 7 hours of sunshine per day on average with typically 69 mm of rainfall in the month.

  • 25°C maximum daytime temperature in September in Siena25
    25°C max day temperature
  • 7 hours of sunshine per day
  • 9 days with some rainfall in September in Siena9
    9 days with some rainfall
  • 14°C minimum night-time temperature in September in Siena14
    14°C 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
  • 69 mm monthly rainfall in September in Siena69
    69 mm 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 / mm)  |  Imperial (°F / inches)

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How hot is it in Siena in September?

Daytime temperatures usually reach 25°C in Siena in September with no heat and humidity, falling to 14°C 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 69mm.

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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