Siena weather in August 2025

Expect daytime maximum temperatures of 28°C in Siena, Tuscany in August based on long-term weather averages. There are 9 hours of sunshine per day on average with typically 43 mm of rainfall in the month.

  • 28°C maximum daytime temperature in August in Siena28
    28°C max day temperature
  • 9 hours of sunshine per day
  • 8 days with some rainfall in August in Siena8
    8 days with some rainfall
  • 17°C minimum night-time temperature in August in Siena17
    17°C min night temperature
  • 14 hours of daylight per day in August in Siena14
    14 hours of daylight per day
  • Moderate heat & humidity in August in SienaM
    Moderate heat & humidity
  • 43 mm monthly rainfall in August in Siena43
    43 mm of monthly rainfall
  • UV (maximum) index 8 (Very High) in August in Siena8
    8 (Very High) UV index

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The August 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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More about Tuscany

How hot is it in Siena in August?

Daytime temperatures usually reach 28°C in Siena in August with moderate heat and humidity, falling to 17°C at night.

How sunny is it in Siena in August?

There are normally 9 hours of bright sunshine each day in Siena in August - that's 63% of daylight hours.

Does it rain in Siena in August?

There are usually 8 days with some rain in Siena in August and the average monthly rainfall is 43mm.

Siena August sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st August 2025 05:05 19:37
Saturday, 16th August 2025 05:21 19:16
Sunday, 31st August 2025 05:38 18:51

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