Warm
Average highs sit around 28°C, giving warm days by monthly-average standards.
Weather Guide
Siena, Italy Average Monthly Weather
Weather score47Mixed annual avg
Best months: July, August, June
Across the year, average daytime temperatures are around 18°C, sunshine averages 5.9h per day, and rainfall totals about 741mm.
Annual weather
Annual averages
Temp
18°C
Rain
741mm
Annual total
Sun
5.9h
Weather score
47
Mixed avg
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
Weather scoreWeather score
Trip feel
Drier
Rainfall averages 43mm, which is relatively low for holiday planning.
Bright
Sunshine averages 8.7h per day, so bright days are a strong part of the month.
Map
Weather map
Compare Siena, Italy with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
August28°C average high
August is one of Siena's warmest months, with daytime heat above the yearly average.
Warmest monthsJune to September
This stretch sets the upper range for average daytime heat.
Rain
August43mm average rain
August sits on the drier side of Siena's year, which helps with sightseeing and transfers.
Driest monthsMay to August
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
August8.7 hours average sun
August is brighter than Siena's yearly average, though the strongest sunshine usually sits closer to the peak months.
Brightest monthsJune to August
This stretch has the strongest sunshine in the monthly averages.
Weather score
August82 weather score
August is one of Siena's best weather-score months, combining the strongest overall balance in the yearly averages.
Best weather monthsJune to August
These months have the strongest weather score in the monthly averages.
