Weather in Siena for September 2027
In general, the average temperature in Siena at the beginning of September is 30.5 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 23.8 °C by the end of September.
Siena experiences moderate rainfall in September, with an average of 7 rainy days and a total precipitation of 83.3 mm.
Is September a good time to visit Siena? check out the best time to travel to Siena page.
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Siena Weather September
Temperatures trend during September in Siena
September weather in Siena day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Sunny | 32° /17° | 0 mm | 7.6 | |
| 2 Sept. |  Thundery outbreaks possible | 29° /16° | 3.2 mm | 7 | |
| 3 Sept. |  Patchy rain possible | 30° /16° | 0.3 mm | 7 | |
| 4 Sept. | Sunny | 32° /17° | 0.8 mm | 7 | |
| 5 Sept. |  Patchy light rain with thunder | 29° /17° | 3.8 mm | 7 | |
| 6 Sept. | Sunny | 30° /16° | 0 mm | 7 | |
| 7 Sept. | Sunny | 32° /16° | 0.4 mm | 7 | |
| 8 Sept. |  Moderate rain | 30° /17° | 10.5 mm | 7 | |
| 9 Sept. | Moderate rain | 29° /17° | 14.4 mm | 6 | |
| 10 Sept. | Moderate rain | 26° /15° | 22.6 mm | 5 | |
| 11 Sept. | Patchy rain possible | 28° /15° | 1.1 mm | 6 | |
| 12 Sept. |  Light rain | 27° /14° | 5.9 mm | 6 | |
| 13 Sept. | Patchy rain possible | 24° /13° | 1.7 mm | 6 | |
| 14 Sept. |  Partly cloudy | 25° /13° | 0.1 mm | 6 | |
| 15 Sept. | Partly cloudy | 27° /14° | 0 mm | 6.3 | |
| 16 Sept. | Patchy rain possible | 27° /15° | 0.1 mm | 6 | |
| 17 Sept. | Patchy rain possible | 26° /15° | 1.5 mm | 6 | |
| 18 Sept. | Patchy rain possible | 25° /14° | 2.1 mm | 6 | |
| 19 Sept. |  Mist | 26° /14° | 0.6 mm | 5.9 | |
| 20 Sept. | Sunny | 26° /15° | 0.2 mm | 5.8 | |
| 21 Sept. | Patchy rain possible | 26° /15° | 1.5 mm | 5 | |
| 22 Sept. | Light rain | 25° /15° | 4.2 mm | 5 | |
| 23 Sept. | Light rain | 23° /13° | 4.7 mm | 5 | |
| 24 Sept. | Patchy rain possible | 22° /12° | 0.7 mm | 4 | |
| 25 Sept. | Patchy rain possible | 23° /12° | 2.2 mm | 5 | |
| 26 Sept. | Sunny | 24° /12° | 0 mm | 5 | |
| 27 Sept. | Partly cloudy | 25° /13° | 0.5 mm | 5.2 | |
| 28 Sept. | Sunny | 24° /11° | 0.1 mm | 5 | |
| 29 Sept. | Sunny | 24° /11° | 0 mm | 5 | |
| 30 Sept. | Partly cloudy | 25° /12° | 0 mm | 4.9 | |
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Siena weather in September vs August vs October
| August | September | October | |
|---|---|---|---|
| Weather | Sunny | Sunny | Patchy rain possible |
| Temperatures | 34°/18° | 27°/14° | 21°/11° |
| Rainfall | 67 mm | 83 mm | 97 mm |
| Wind | 17.8 km/h | 14.7 km/h | 13.5 km/h |
| Humidity | 56% | 65% | 75% |
| Rainy days | 8 days | 7 days | 12 days |
| Dry days | 23 days | 23 days | 19 days |
Planning a trip to Siena? Discover the best time to visit
Siena in September - FAQ
What are the expected maximum and minimum temperatures in Siena during September?
How much rainfall should be expected in Siena during September?
What are the typical wind conditions in Siena during September?
September rainfall patterns in Siena
UV exposure in Siena during September
What to pack to Siena in September?
Warm & sunny · highs around 27 °C, frequent showers
As you prepare for your trip to Siena in September, 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 September, is comfortable and enjoyable, regardless of the weather conditions.
🧥 Clothing
👟 Footwear
🎒 Accessories
🧴 Personal Items
Where is Siena?Get accurate weather forecasts for Siena, located at latitude 43.318 and longitude 11.331. Stay updated with localized weather information tailored for Siena.