Siena in september: average Weather, Temperature and Climate
Weather in Siena in september 2025
The weather in Siena in the month of september comes from statistical datas on the past years. You can view the weather statistics for the whole month, but also navigating through the tabs for the beginning, the middle and the end of the month.
Average weather throughout september
perfect weather UV index: 6
Weather at 6am
61°F
Clear/Sunny
56% of time
20%
10%
8%
Weather at 12pm
79°F
Clear/Sunny
56% of time
26%
10%
4%
Weather at 6pm
67°F
Clear/Sunny
62% of time
22%
10%
4%
Weather at 3am
59°F
47%
18%
17%
15%
Evolution of daily average temperature and precipitation in Siena in september
These charts show the evolution of average minimum/maximum temperatures as well as average daily precipitation volume in Siena in september.
The climate of Siena in september is perfect
In september in Siena, the climate is rather dry (with 3.2in of precipitation over 4 days). It should be noted a worsening from the previous month since in august there is an average of 1.5in of rainfall over 2 days.
The climate quite pleasant around this city this month. Temperatures are up to 79°F. The minimum is 61°F. Thus, the mean temperature average on this month of september in Siena is 70°F. These temperatures are far removed from those records observed in Siena in september with a maximum record of 94°F in 2018 and a minimum record of 49°F in 2010.
Day length in Siena in september is 12:30. The sun rises at 05:54 and sets at 18:24.
With a good weather, september is a good time to go in this city.
Seasonal average climate and temperature of Siena in september
Check below seasonal norms These statistics are set from the weather statements of the past years of the month of september.
| September | |||||
| Outside temperature | |||||
| Average temperature | 70°F | ||||
| Highest temperature | 79°F | ||||
| Lowest temperature | 61°F | ||||
| Highest record temperature | 94°F (2018) | ||||
| Lowest record temperature | 49°F (2010) | ||||
| Number of days at +86°F | 5 day(s) (17%) | ||||
| Number of days at +65°F | 30 day(s) (100%) | ||||
| Wind | |||||
| Wind speed | 13km/h | ||||
| Wind temperature | 61°F | ||||
| Precipitation (rainfall) | |||||
| Rainfall | 3.2in | ||||
| Number of days with rainfall | 4 day(s) (13%) | ||||
| Record daily rainfall | 4.3in (2009) | ||||
| Other climate data | |||||
| Humidity | 83% | ||||
| Visibility | 9.18km | ||||
| Cloud cover | 22% | ||||
| UV index | 6 | ||||
| Daily sunshine hours | 12 | ||||
| Sunrise and sunset | |||||
| Time of sunrise | 05:54 | ||||
| Time of sunset | 18:24 | ||||
| Length of day | 12:30 | ||||
| Our opinion about the weather in september | |||||
| Our opinion at whereandwhen.net | perfect | ||||
How was the weather last september?
Here is the day by day recorded weather in Siena in september 2024:
68°F to 97°F
68°F to 90°F
65°F to 88°F
65°F to 86°F
65°F to 81°F
63°F to 81°F
61°F to 88°F
67°F to 76°F
67°F to 79°F
59°F to 81°F
59°F to 83°F
61°F to 74°F
54°F to 61°F
47°F to 68°F
50°F to 72°F
52°F to 72°F
56°F to 67°F
56°F to 61°F
54°F to 65°F
54°F to 72°F
54°F to 77°F
58°F to 77°F
58°F to 74°F
59°F to 72°F
56°F to 74°F
58°F to 76°F
67°F to 77°F
58°F to 67°F
50°F to 67°F
49°F to 70°F
Map: other cities in Italy in september
Cities near Siena:
| San Gimignano in september | good weather |
| Chianciano Terme in september | perfect weather |
| Tuscany in september | good weather |
| Florence in september | good weather |
| Sarteano in september | perfect weather |
| Follonica in september | good weather |
| Grosseto in september | good weather |
| Piombino in september | good weather |
| Pitigliano in september | perfect weather |
| Livorno in september | good weather |
| Calamecca in september | good weather |
| Pisa in september | good weather |
Click over cities on the map for information about the weather in september.
Siena
perfect weather
good
tolerable
bad
very bad
Weather data for Siena in september:
Weather data for Siena for september are derived from an average of the weather forecast since 2009 in Siena. There is a margin of error and these forecasts are to be considered as general information only. The weather in Siena can vary slightly from year to year, but this data should limit surprises. So you can pack your bags or check for the best time in year to go to Siena.