Siena weather in May
Temperature, rain and sunshine in May: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in May
Excellent
Best time to visit: May – September
What is the weather like in Siena in May?
In May, Siena is warm: daytime highs average 21 °C, and nights cool down to about 11 °C. The sun shines for around 8 hours a day. Rain is frequent, with about 11 rainy days and 74 mm in total. All in all, May is an excellent month for a holiday in Siena.
May compared
How the weather changes from April to June. Tap a month to open it.
More details for May
- Daylight
- 14 h 39 min05:51 – 20:30
- UV index
- 9 · very highclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 14 km/haverage daily peakAll months
- Cloud cover
- 54 %on averageAll months
- Hot days
- 0 days30 °C or moreAll months
- Snow days
- 0 days1 cm or more of fresh snow
- Time zone
- UTC+2Europe/Rome
How the score comes together
- Temperatureweight 50 %100 %
- Sunshineweight 20 %82 %
- Few rainy daysweight 30 %53 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in May
- Sunscreen
- Sunglasses & sun hat
- A jumper for the evenings
- Rain jacket or umbrella
Siena in May: quick answers
Is Siena hot in May?
Warm rather than hot: in May, daytime highs in Siena average 21 °C and nights cool to about 11 °C.
Does it rain much in Siena in May?
Rain is frequent, with about 11 rainy days and 74 mm in total.
Siena month by month
The whole year in SienaAll destinations: ItalyWhere to go in May
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences