Sion Airport (SIR) 15 Day Weather Forecast, Sion Switzerland
Current weather conditions and 15 day weather forecast for Sion Airport in Sion, Switzerland including weather daily high/low temperature, warnings, chance of precipitation, pressure, humidity/wind chill, rain, wind speed, cloud, pressure, and UV index.
Current weather conditions at SIR
| 18 September 2026 Fri 6.4 ° C ( 43.5°F )  Overcast |
Feels Like : 4.8 ° C / 40.6°F Humidity : % 79 Pressure : 1018 mb Wind Speed : 3.6 kmph / 2.2 miles from SE 
Visibility : 10 km Precipitation (rainfall) : 0 mm Cloud (%) : 100 |
15-day weather forecast for Sion Airport, Sion, Switzerland
| Date | Weather forecast | Low temperature | High temperature | Average Temperature | Humidity | Wind | Chance of rain |
|---|---|---|---|---|---|---|---|
| 18 September 2026 Fri | Overcast |
5.8 ° C | 13.4 ° C | 9.4 ° C | % 70 | 8.6 km/h | 11% |
| 19 September 2026 Sat |  Sunny |
6.8 ° C | 16.8 ° C | 11.3 ° C | % 68 | 8.3 km/h | 9% |
| 20 September 2026 Sun | Overcast |
9.3 ° C | 18.2 ° C | 13.1 ° C | % 64 | 8.6 km/h | 9% |
| 21 September 2026 Mon | Overcast |
9.5 ° C | 18 ° C | 13.4 ° C | % 65 | 8.6 km/h | 12% |
| 22 September 2026 Tue | Sunny |
9.7 ° C | 19.3 ° C | 13.9 ° C | % 68 | 8.3 km/h | 6% |
| 23 September 2026 Wed | Sunny |
11.4 ° C | 18.9 ° C | 14.3 ° C | % 66 | 9.4 km/h | 6% |
| 24 September 2026 Thu | Overcast |
11.7 ° C | 17.7 ° C | 14.1 ° C | % 71 | 7.6 km/h | 12% |
| 25 September 2026 Fri | Overcast |
10.2 ° C | 18.8 ° C | 13.7 ° C | % 55 | 7.6 km/h | 8% |
| 26 September 2026 Sat | Sunny |
10.1 ° C | 18.2 ° C | 13.4 ° C | % 53 | 9 km/h | 5% |
| 27 September 2026 Sun | Sunny |
10.2 ° C | 18 ° C | 13.3 ° C | % 54 | 8.3 km/h | 2% |
| 28 September 2026 Mon | Sunny |
10 ° C | 18.1 ° C | 13.3 ° C | % 52 | 6.8 km/h | 5% |
| 29 September 2026 Tue | Sunny |
11.1 ° C | 19.5 ° C | 14.4 ° C | % 48 | 7.6 km/h | 4% |
| 30 September 2026 Wed | Sunny |
12 ° C | 20.4 ° C | 15.4 ° C | % 54 | 7.9 km/h | 5% |
| 01 October 2026 Thu |  Cloudy |
11.5 ° C | 20.4 ° C | 15.2 ° C | % 55 | 9.4 km/h | 6% |
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