August · Italy
Best time to visit Siena in August Weather, crowds & prices
Weather in Siena in August
Average temperature 26°C, 46 mm of rain, about 31 days with 6+ hours of sunshine and 57% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
August score
8.1/10
Ranked #5 of 12 months
- Avg temp
- 26°C
- Rainfall
- 46 mm
- Humidity
- 57%
- Days with 6h+ sun
- 31
- Crowd Density
- Moderate Crowds
- Average Expenses
- $$ · Moderate Cost ($$)
August in Siena scores 8.1/10 for sightseeing and cultural travel - an above-average month (#5 of 12). Expect around 26°C, 46 mm of rain, and roughly 31 days with 6+ hours of sunshine this month.
Siena's medieval center revolves around Piazza del Campo, framed by the Palazzo Pubblico and the Torre del Mangia.
August holds up well in Siena — 5th best month
August averages 26°C (78°F) — pleasant for mornings and evenings on foot in the city, with a midday break when the sun is strongest.
Rainfall runs 46 mm, so plan one flexible day in three; you still get about 31 days with 6+ hours of sunshine and 13.9 hours of daylight.
It scores 8.1/10 here, 5th of 12 months, against 9.3/10 in the destination's best month.
Pack light clothing, a hat and real sun protection, a packable rain layer.
Plan for mid-season pricing, with crowds are moderate.
Frequently asked
- What is the weather like in Siena in August?
- In August, Siena averages 26°C, 46 mm of rain, and about 31 days with 6+ hours of sunshine. Its climate-comfort score is 8.1/10.
- Is August a good time to visit Siena?
- August earns a 8.1/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Siena in August?
- Expect about 46 mm of rain in August. Average humidity is 57% and there are about 31 days with 6+ hours of sunshine.
Curated in Siena
Tickets & experiences
Things to do in Siena
Siena, Italy. Live activities and tours from GetYourGuide, matched to this destination.