Upplands Väsby Weather in September
Average highs run from 19°C on September 1 to 14°C on September 30, and lows from 10°C to 6°C. Normal precipitation for the month is 60 mm over about 9 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
- 17°C
- Average low
- 9°C
- Precipitation
- 60 mm
- Record high
- 28°CSep 7, 1968
- Record low
- -4°CSep 27, 1986
- Daylight
- 14 h 07 min to 11 h 34 min
- Cloud cover
- 68%
- Humidity
- 82%
- Dew point
- 9°C
- Wind
- 10.4 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 | 19°C | 10°C | 26°C 2019 | 3°C 1959 | 40% |
| Sep 2 | 20°C | 10°C | 26°C 1983 | 2°C 1998 | 40% |
| Sep 3 | 19°C | 11°C | 24°C 2002 | 4°C 1981 | 38% |
| Sep 4 | 19°C | 11°C | 26°C 1999 | 4°C 1998 | 38% |
| Sep 5 | 19°C | 10°C | 27°C 2024 | 1°C 2021 | 37% |
| Sep 6 | 18°C | 10°C | 27°C 1968 | 1°C 1984 | 36% |
| Sep 7 | 18°C | 10°C | 28°C 1968 | 3°C 1991 | 36% |
| Sep 8 | 18°C | 10°C | 26°C 1955 | 1°C 1952 | 37% |
| Sep 9 | 18°C | 10°C | 26°C 1955 | 2°C 1976 | 38% |
| Sep 10 | 18°C | 10°C | 25°C 2023 | 2°C 1952 | 38% |
| Sep 11 | 18°C | 9°C | 23°C 1959 | 0°C 1964 | 37% |
| Sep 12 | 18°C | 9°C | 24°C 2002 | 1°C 1996 | 37% |
| Sep 13 | 18°C | 9°C | 25°C 1969 | 0°C 1952 | 37% |
| Sep 14 | 17°C | 9°C | 23°C 2006 | 0°C 1971 | 37% |
| Sep 15 | 16°C | 9°C | 23°C 2016 | 0°C 1952 | 36% |
| Sep 16 | 16°C | 8°C | 21°C 1963 | -1°C 1971 | 36% |
| Sep 17 | 16°C | 8°C | 25°C 1961 | -1°C 1987 | 35% |
| Sep 18 | 16°C | 7°C | 23°C 2003 | 0°C 1993 | 34% |
| Sep 19 | 16°C | 8°C | 22°C 2018 | 0°C 1981 | 34% |
| Sep 20 | 16°C | 8°C | 21°C 2024 | 0°C 1952 | 33% |
| Sep 21 | 16°C | 8°C | 22°C 1989 | -3°C 1952 | 35% |
| Sep 22 | 16°C | 8°C | 23°C 2006 | 1°C 2002 | 34% |
| Sep 23 | 16°C | 7°C | 22°C 2006 | -1°C 2019 | 32% |
| Sep 24 | 16°C | 7°C | 22°C 2006 | -3°C 1952 | 32% |
| Sep 25 | 15°C | 7°C | 20°C 1997 | -1°C 1977 | 31% |
| Sep 26 | 15°C | 8°C | 23°C 2006 | -2°C 2002 | 32% |
| Sep 27 | 15°C | 8°C | 22°C 2006 | -4°C 1986 | 32% |
| Sep 28 | 14°C | 8°C | 20°C 2023 | -3°C 1970 | 32% |
| Sep 29 | 14°C | 6°C | 20°C 2011 | -2°C 1966 | 33% |
| Sep 30 | 14°C | 6°C | 19°C 2011 | -4°C 1976 | 35% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT+2).
- September 1
- sunrise 5:44 AM, sunset 7:51 PM
- September 30
- sunrise 6:51 AM, sunset 6:25 PM
Other months
Sources
Records: NOAA GHCN-Daily, station SWE00138894, 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.