May · Italy
Best time to visit Siena in May Weather, crowds & prices
Weather in Siena in May
Average temperature 17°C, 93 mm of rain, about 28 days with 6+ hours of sunshine and 71% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
May score
8.4/10
Ranked #2 of 12 months
- Avg temp
- 17°C
- Rainfall
- 93 mm
- Humidity
- 71%
- Days with 6h+ sun
- 28
- Crowd Density
- Moderate Crowds
- Average Expenses
- $$ · Moderate Cost ($$)
May in Siena scores 8.4/10 for sightseeing and cultural travel - one of the top 12-month picks (#2). Expect around 17°C, 93 mm of rain, and roughly 28 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.
May in Siena: strong conditions, 2nd of 12
May averages 17°C (63°F), the range most people find easiest for walking a city all day without either overheating or losing daylight to weather.
Rainfall runs 93 mm, so plan one flexible day in three; you still get about 28 days with 6+ hours of sunshine and 14.7 hours of daylight.
It scores 8.4/10 here, 2nd of 12 months, against 9.3/10 in the destination's best month.
Pack layers you can shed by midday plus one warm layer for the evening, a packable rain layer.
Figure on mid-season pricing, with crowds are moderate.
Frequently asked
- What is the weather like in Siena in May?
- In May, Siena averages 17°C, 93 mm of rain, and about 28 days with 6+ hours of sunshine. Its climate-comfort score is 8.4/10.
- Is May a good time to visit Siena?
- May earns a 8.4/10 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 May?
- Expect about 93 mm of rain in May. Average humidity is 71% and there are about 28 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.