Weather in Siena in August

General weather information about Siena

Average annual temperature is 18.8 °C

Absolute maximum temperature: 46.2 °C

Absolute minimum temperature: 4.3 °C

Number of sunny days: 189 days

Number of rainy days: 176 days

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* Weather data for Siena Italy is based on climate observations for 2026 year

Siena air temperature forecast for each month

JanFebMarAprMayJunJulAugSepOctNovDec
Absolute maximum temperature (°C)20.421.720.922.424.230.646.234.638.135.727.523.9
Average daytime temperature (°C)15.113.816.417.720.825.533.230.328.327.121.317.3
Average temperature (°C)11.710.613.314.518.022.628.926.524.322.617.913.8
Average night temperature (°C)8.77.49.911.215.119.324.322.520.818.914.210.8
Absolute minimum temperature (°C)4.44.35.47.012.415.719.819.117.716.38.87.2

Siena monthly weather indicators

JanFebMarAprMayJunJulAugSepOctNovDec
Daylight maximum duration (h)10.011.012.013.014.014.014.014.013.011.010.09.0
Daylight mean duration (h)9.910.812.013.214.214.814.513.612.411.210.19.6
Daylight minimum duration (h)9.010.011.012.013.014.014.013.011.010.09.09.0
Sunshine mean duration (h)7.27.99.510.39.112.413.512.310.69.67.86.5
Precipitation (mm)12687761921928371077206833
Sunny days81316131115272015221118
Rainy days2315151720154111591913
Snow days000000000000

Siena - weather forecast by months

Siena weather in januarySiena weather in februarySiena weather in marchSiena weather in aprilSiena weather in maySiena weather in juneSiena weather in julySiena weather in augustSiena weather in septemberSiena weather in octoberSiena weather in novemberSiena weather in december

Best time to visit Siena:

The best time to visit Siena during the most sunny months:

  • June — 12.4(h)
  • July — 13.5(h)
  • August — 12.3(h)

The largest precipitation sum in Siena is at

  • January — 126(mm)
  • April — 192(mm)
  • May — 192(mm)

    • Weather forecast in the closest to Siena admin centers

    Weather forecast in the closest towns to Siena

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    Frequently asked questions

    When is the best time to visit Siena?
    The historical weather data above shows the warmest, sunniest and driest months to help you choose the best time to visit Siena.
    What is the weather like in Siena?
    See average temperature, rainfall and daylight hours for Siena by month in the table above.
    How many sunny days does Siena have?
    The monthly weather statistics above show sunshine and rainfall patterns for Siena throughout the year.