Ballaison Weather in September
Average highs run from 23°C on September 1 to 19°C on September 30, and lows from 12°C to 9°C. Normal precipitation for the month is 86 mm over about 12 wet days.
September day by day
The normal high and low for each date, and the record, in °C.
- Normal low
- Normal high
- Record high
- Record low
September at a glance
- Average high
- 21°C
- Average low
- 11°C
- Precipitation
- 86 mm
- Record high
- 33°CSep 3, 1962
- Record low
- 0°CSep 30, 1972
- Daylight
- 13 h 19 min to 11 h 45 min
- Cloud cover
- 61%
- Humidity
- 75%
- Dew point
- 9°C
- Wind
- 11.2 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 | Record high | Record low | Chance wet |
|---|---|---|---|---|---|
| Sep 1 | 23°C | 12°C | 31°C 2024 | 5°C 1990 | 39% |
| Sep 2 | 23°C | 12°C | 32°C 1962 | 5°C 1978 | 39% |
| Sep 3 | 23°C | 13°C | 33°C 1962 | 5°C 1978 | 38% |
| Sep 4 | 23°C | 12°C | 29°C 2020 | 7°C 1978 | 39% |
| Sep 5 | 23°C | 12°C | 30°C 2013 | 5°C 1976 | 40% |
| Sep 6 | 23°C | 12°C | 30°C 2023 | 5°C 1992 | 41% |
| Sep 7 | 23°C | 12°C | 31°C 2023 | 6°C 1976 | 42% |
| Sep 8 | 22°C | 12°C | 31°C 1966 | 5°C 1984 | 41% |
| Sep 9 | 23°C | 12°C | 31°C 1966 | 5°C 1962 | 41% |
| Sep 10 | 24°C | 12°C | 31°C 2023 | 4°C 1996 | 42% |
| Sep 11 | 23°C | 12°C | 31°C 2023 | 3°C 1972 | 42% |
| Sep 12 | 22°C | 12°C | 31°C 2018 | 2°C 1972 | 44% |
| Sep 13 | 22°C | 12°C | 31°C 1987 | 4°C 1972 | 44% |
| Sep 14 | 21°C | 12°C | 32°C 1987 | 4°C 1970 | 43% |
| Sep 15 | 21°C | 10°C | 30°C 2000 | 4°C 2017 | 43% |
| Sep 16 | 21°C | 11°C | 30°C 1986 | 1°C 1957 | 43% |
| Sep 17 | 21°C | 10°C | 30°C 1987 | 3°C 1957 | 43% |
| Sep 18 | 20°C | 10°C | 30°C 2018 | 1°C 1971 | 44% |
| Sep 19 | 20°C | 11°C | 28°C 2018 | 1°C 1962 | 44% |
| Sep 20 | 21°C | 10°C | 30°C 1987 | 1°C 1962 | 43% |
| Sep 21 | 21°C | 10°C | 29°C 2018 | 2°C 1972 | 42% |
| Sep 22 | 21°C | 11°C | 29°C 1987 | 1°C 1977 | 40% |
| Sep 23 | 20°C | 11°C | 29°C 2018 | 2°C 1962 | 42% |
| Sep 24 | 19°C | 10°C | 27°C 1985 | 3°C 1977 | 42% |
| Sep 25 | 19°C | 9°C | 27°C 1978 | 2°C 1972 | 42% |
| Sep 26 | 18°C | 9°C | 26°C 1985 | 1°C 1979 | 42% |
| Sep 27 | 19°C | 9°C | 27°C 1961 | 2°C 1979 | 42% |
| Sep 28 | 19°C | 9°C | 25°C 2000 | 2°C 1972 | 44% |
| Sep 29 | 19°C | 9°C | 27°C 2019 | 0°C 1972 | 46% |
| Sep 30 | 19°C | 9°C | 24°C 1985 | 0°C 1972 | 46% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT+2).
- September 1
- sunrise 6:55 AM, sunset 8:14 PM
- September 30
- sunrise 7:32 AM, sunset 7:17 PM
Other months
Sources
Records: NOAA GHCN-Daily, station SZ000008440, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: 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.