Sion in september: average Weather, Temperature and Climate
Weather in Sion in september 2025
The weather in Sion in september comes from statistical datas on the past years. You can view the weather statistics for the whole month, but also by using the tabs for the beginning, the middle and the end of the month.
Average weather throughout september
tolerable weather
Weather at 6am
43°F
Clear/Sunny
35% of time
22%
21%
12%
Weather at 12pm
56°F
Clear/Sunny
44% of time
22%
16%
16%
Weather at 6pm
45°F
Moderate rain at times
37% of time
20%
14%
12%
Weather at 3am
41°F
29%
24%
23%
14%
Evolution of daily average temperature and precipitation in Sion in september
These charts show the evolution of average minimum/maximum temperatures as well as average daily precipitation volume in Sion in september.
The climate of Sion in september is tolerable
The weather in september in Sion is wet (with 7.6in of rainfall over 10 days). It should be noted an improvement from the previous month since in august it receives an average of 12.2in of precipitation over 14 days.
The climate is fairly fresh in that locality the month of september, but it is livable by dressing hot. The high seasonal norm is 56°F. The minimum is 43°F. Thus, the mean temperature average in september in Sion is 50°F. Note that these seasonal averages are in contrast with those observed in Sion in september with a maximum record of 72°F in 2020 and a minimum record of 23°F in 2020. You can hope to have about 5 days with temperatures over 65°F, or 17% of the month.
On average, in Sion, the days of september last 12:33. The sun rises at 06:09 and sets at 18:42.
With a good weather, september is recommended to go there.
September: another location in Switzerland?
If you want to go to Switzerland in september, there are destinations with better weather than Sion:
In september, Zurich, Basel, Geneva, Lausanne, Lucerne and Lugano have good weather.
Seasonal average climate and temperature of Sion in september
Check below seasonal norms These statistics are generated from the weather statements of the past years of the month of september.
| September | |||||
| Outside temperature | |||||
| Average temperature | 50°F | ||||
| Highest temperature | 56°F | ||||
| Lowest temperature | 43°F | ||||
| Highest record temperature | 72°F (2020) | ||||
| Lowest record temperature | 23°F (2020) | ||||
| Number of days at +65°F | 5 day(s) (17%) | ||||
| Number of days at -32°F | 3 day(s) (10%) | ||||
| Wind | |||||
| Wind speed | 10km/h | ||||
| Wind temperature | 41°F | ||||
| Precipitation (rainfall) | |||||
| Rainfall | 7.6in | ||||
| Number of days with rainfall | 10 day(s) (35%) | ||||
| Record daily rainfall | 2.8in (2020) | ||||
| Snowfall | 0cm | ||||
| Other climate data | |||||
| Humidity | 88% | ||||
| Visibility | 8.22km | ||||
| Cloud cover | 40% | ||||
| UV index | 3 | ||||
| Daily sunshine hours | 11 | ||||
| Sunrise and sunset | |||||
| Time of sunrise | 06:09 | ||||
| Time of sunset | 18:42 | ||||
| Length of day | 12:33 | ||||
| Our opinion about the weather in september | |||||
| Our opinion at whereandwhen.net | tolerable | ||||
How was the weather last september?
Here is the day by day recorded weather in Sion in september 2024:
52°F to 72°F
49°F to 67°F
50°F to 68°F
50°F to 63°F
49°F to 56°F
45°F to 67°F
47°F to 70°F
49°F to 65°F
47°F to 49°F
45°F to 59°F
40°F to 56°F
36°F to 41°F
31°F to 38°F
31°F to 43°F
32°F to 54°F
36°F to 52°F
38°F to 54°F
34°F to 58°F
38°F to 58°F
40°F to 59°F
41°F to 59°F
41°F to 59°F
41°F to 47°F
38°F to 52°F
38°F to 54°F
45°F to 50°F
41°F to 52°F
34°F to 36°F
31°F to 52°F
41°F to 54°F
Map: other cities in Switzerland in september
Cities near Sion:
| Sierre in september | very bad weather |
| Martigny-Ville in september | very bad weather |
| Gstaad in september | tolerable weather |
| Monthey in september | tolerable weather |
| Zermatt in september | very bad weather |
| Morgins in september | tolerable weather |
| Visp in september | very bad weather |
| Montreux in september | tolerable weather |
| Gruyères in september | tolerable weather |
| Frutigen in september | tolerable weather |
| Vevey in september | tolerable weather |
| Bulle in september | tolerable weather |
Click over cities on the map for information about the weather in september.
Sion
perfect weather
good
tolerable
bad
very bad
Weather data for Sion in september:
Weather data for Sion for september are derived from an average of the weather forecast since 2009 in Sion. There is a margin of error and these forecasts are to be considered as general information only. The weather in Sion 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 Sion.