Siena
May
Weather in Siena for May 2026
Your guide to Siena weather in May - trends and predictions
In general, the average temperature in Siena at the beginning of May is 18.3 °C. As the month progressed, temperatures tended to significantly warm up, reaching an average of 23.1 °C by the end of May.
Siena experiences heavy rainfall in May, with over 20 rainy days and an average total precipitation 94.8 mm.
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Temperatures
Rain 🌧️
More
8
Dry days
23
Rainy days
0
Snow days
21°/10°
Temperatures
14 km/h
Avg max wind
76 %
Avg humidity
Siena Weather May
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Temperatures trend during May in Siena
See the weather trend as well as the moving average line
May weather in Siena day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 May |  Moderate or heavy rain with thunder | 21° /11° | 8.2 mm | 5 | |
| 2 May |  Light rain shower | 18° /9° | 2 mm | 5 | |
| 3 May | Light rain shower | 18° /9° | 3.8 mm | 5 | |
| 4 May | Patchy rain possible | 19° /7° | 0.7 mm | 5 | |
| 5 May | Patchy rain possible | 19° /9° | 6.9 mm | 4 | |
| 6 May |  Partly cloudy | 18° /8° | 6.4 mm | 5 | |
| 7 May | Moderate or heavy rain with thunder | 15° /9° | 7.2 mm | 4 | |
| 8 May | Patchy rain possible | 19° /7° | 4.5 mm | 5 | |
| 9 May | Partly cloudy | 20° /9° | 1.6 mm | 5 | |
| 10 May |  Sunny | 21° /8° | 1.5 mm | 6 | |
| 11 May | Sunny | 22° /9° | 1.2 mm | 6 | |
| 12 May | Partly cloudy | 22° /9° | 1.1 mm | 6 | |
| 13 May | Patchy rain possible | 21° /10° | 0.9 mm | 5 | |
| 14 May | Patchy rain possible | 23° /9° | 0 mm | 5 | |
| 15 May | Light rain shower | 22° /11° | 1.8 mm | 5 | |
| 16 May | Light rain shower | 19° /9° | 3.1 mm | 5 | |
| 17 May | Patchy rain possible | 19° /7° | 0.5 mm | 5 | |
| 18 May | Sunny | 22° /7° | 0.8 mm | 5 | |
| 19 May |  Patchy light rain with thunder | 22° /10° | 2.4 mm | 5 | |
| 20 May |  Moderate or heavy rain shower | 22° /12° | 10.6 mm | 5 | |
| 21 May | Light rain shower | 20° /11° | 9 mm | 5 | |
| 22 May | Patchy light rain with thunder | 20° /10° | 9.9 mm | 5 | |
| 23 May |  Patchy light drizzle | 20° /9° | 2.1 mm | 5 | |
| 24 May | Patchy rain possible | 21° /8° | 0.1 mm | 5 | |
| 25 May | Patchy light drizzle | 21° /8° | 1.6 mm | 6 | |
| 26 May |  Overcast | 22° /9° | 0.1 mm | 5 | |
| 27 May | Patchy rain possible | 23° /11° | 2 mm | 5 | |
| 28 May | Light rain shower | 23° /11° | 0.8 mm | 6 | |
| 29 May | Light rain shower | 24° /12° | 1.9 mm | 6 | |
| 30 May | Light rain shower | 24° /12° | 0.9 mm | 6 | |
| 31 May | Patchy rain possible | 25° /12° | 1.2 mm | 6 | |
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Important Notice
Our weather forecast for Siena in May is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Siena forecast closer to your planned date for the most up-to-date weather information.
Change Month
Siena weather in May vs April vs June
Compare May weather in Siena with the previous and following months. See how temperature, rainfall, wind, and other conditions change throughout the year to help you plan your visit.
| April | May | June | |
|---|---|---|---|
| Weather | Patchy rain possible | Patchy rain possible | Sunny |
| Temperatures | 18°/7° | 21°/10° | 29°/15° |
| Rainfall | 70 mm | 95 mm | 17 mm |
| Wind | 14.5 km/h | 13.6 km/h | 16.7 km/h |
| Humidity | 74% | 76% | 62% |
| Rainy days | 17 days | 23 days | 5 days |
| Dry days | 13 days | 8 days | 25 days |
Planning a trip to Siena? Discover the best time to visit
Siena in May - FAQ
What are the expected maximum and minimum temperatures in Siena during May?
Enjoy moderate daytime temperatures of up to 21° and cooler nights around 10°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Siena during May?
Moderate rainfall is anticipated in Siena during May, with a total of 94.8 mm spread over approximately 23 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Siena during May?
The average wind speed in Siena during May is 14 km/h, suggesting breezy to windy conditions, depending on your activities.
What to pack to Siena in May?
As you prepare for your trip to Siena in May, it's important to consider the typical weather patterns for the time of year. Below is a carefully tailored packing list to ensure that your time in Siena, during May, is comfortable and enjoyable, regardless of the weather conditions.
- Clothing
- Warm Clothing: Sweaters, hoodies, long pants
- Rain Gear: Lightweight, waterproof clothing
- Footwear
- Waterproof Shoes
- Accessories
- Sunglasses: For sun protection
- Sun Hats: Wide-brimmed hats for sun protection in warm weather
- Scarves: To protect you from the cold wind
- Gloves/Mittens: Essential for cold weather
- Warm Hats: Warm hats for insulation in cold weather
- Umbrellas/Raincoats: For rainy days
May rainfall patterns in Siena
Explore the daily rainfall trends and prepare for Sienas May weather 💧
UV exposure in Siena during May
Stay informed about UV levels for safe outdoor activities throughout the month of May ☀️
Quick links
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