Sierre Weather in September
Average highs run from 16°C on September 1 to 12°C on September 30, and lows from 7°C to 3°C. Normal precipitation for the month is 93 mm over about 15 wet days.
September day by day
The normal high and low for each date, in °C.
- Normal low
- Normal high
- Reanalysis extreme high
- Reanalysis extreme low
September at a glance
- Average high
- 14°C
- Average low
- 5°C
- Precipitation
- 93 mm
- Reanalysis high
- 24°CSep 1, 2009
- Reanalysis low
- -5°CSep 25, 2002
- Daylight
- 13 h 19 min to 11 h 45 min
- Cloud cover
- 61%
- Humidity
- 79%
- Dew point
- 5°C
- Wind
- 6.8 km/h
Every day of the month
A wet day has at least 1 mm of precipitation in the reanalysis.
| Date | Normal high | Normal low | Reanalysis high | Reanalysis low | Chance wet |
|---|---|---|---|---|---|
| Sep 1 | 16°C | 7°C | 24°C 2009 | 1°C 1995 | 48% |
| Sep 2 | 16°C | 7°C | 22°C 1998 | 0°C 1992 | 47% |
| Sep 3 | 16°C | 6°C | 21°C 2011 | 2°C 1996 | 48% |
| Sep 4 | 16°C | 6°C | 22°C 2020 | 0°C 1992 | 49% |
| Sep 5 | 15°C | 6°C | 21°C 2006 | -1°C 1992 | 50% |
| Sep 6 | 15°C | 6°C | 22°C 2006 | -2°C 2007 | 50% |
| Sep 7 | 15°C | 6°C | 20°C 2016 | -1°C 1996 | 50% |
| Sep 8 | 15°C | 6°C | 20°C 2012 | -1°C 1996 | 49% |
| Sep 9 | 15°C | 6°C | 21°C 1998 | 0°C 1996 | 49% |
| Sep 10 | 15°C | 6°C | 22°C 2011 | -1°C 2001 | 50% |
| Sep 11 | 15°C | 5°C | 22°C 2011 | 0°C 2001 | 50% |
| Sep 12 | 15°C | 5°C | 21°C 2018 | 0°C 2001 | 51% |
| Sep 13 | 15°C | 5°C | 22°C 2020 | -1°C 1998 | 50% |
| Sep 14 | 15°C | 5°C | 22°C 2020 | -1°C 1998 | 49% |
| Sep 15 | 15°C | 5°C | 21°C 2020 | -2°C 2008 | 48% |
| Sep 16 | 14°C | 5°C | 20°C 2011 | -2°C 2008 | 48% |
| Sep 17 | 14°C | 5°C | 22°C 2018 | -2°C 1994 | 49% |
| Sep 18 | 14°C | 5°C | 22°C 2003 | -3°C 2001 | 49% |
| Sep 19 | 14°C | 4°C | 22°C 2003 | -2°C 2001 | 49% |
| Sep 20 | 14°C | 4°C | 22°C 2003 | -2°C 2012 | 48% |
| Sep 21 | 14°C | 4°C | 21°C 2003 | -1°C 2008 | 47% |
| Sep 22 | 14°C | 4°C | 20°C 1991 | -2°C 2008 | 45% |
| Sep 23 | 13°C | 4°C | 20°C 2018 | -1°C 2002 | 46% |
| Sep 24 | 13°C | 4°C | 20°C 1991 | -4°C 2002 | 45% |
| Sep 25 | 13°C | 4°C | 19°C 1991 | -5°C 2002 | 45% |
| Sep 26 | 13°C | 4°C | 17°C 2000 | -5°C 2002 | 45% |
| Sep 27 | 13°C | 4°C | 20°C 2018 | -4°C 2020 | 45% |
| Sep 28 | 13°C | 4°C | 18°C 2011 | -2°C 2007 | 47% |
| Sep 29 | 13°C | 4°C | 18°C 2011 | -3°C 1993 | 49% |
| Sep 30 | 12°C | 3°C | 19°C 2011 | -2°C 1995 | 50% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT+2).
- September 1
- sunrise 6:50 AM, sunset 8:09 PM
- September 30
- sunrise 7:27 AM, sunset 7:12 PM
Other months
Sources
Cloud, humidity, wind and sunshine, and temperature and precipitation: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.