Valkeakoski Weather in September
Average highs run from 17°C on September 1 to 11°C on September 30, and lows from 9°C to 5°C. Normal precipitation for the month is 66 mm over about 12 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
- 7°C
- Precipitation
- 66 mm
- Reanalysis high
- 22°CSep 1, 2019
- Reanalysis low
- -3°CSep 30, 1993
- Daylight
- 14 h 16 min to 11 h 32 min
- Cloud cover
- 69%
- Humidity
- 88%
- Dew point
- 8°C
- Wind
- 9.0 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 | 17°C | 9°C | 22°C 2019 | 2°C 2007 | 46% |
| Sep 2 | 17°C | 9°C | 22°C 1991 | 1°C 2003 | 48% |
| Sep 3 | 16°C | 9°C | 22°C 2004 | 3°C 2003 | 47% |
| Sep 4 | 16°C | 9°C | 20°C 2018 | 5°C 1993 | 45% |
| Sep 5 | 16°C | 9°C | 21°C 1999 | 3°C 1993 | 44% |
| Sep 6 | 16°C | 9°C | 21°C 1999 | 2°C 2000 | 44% |
| Sep 7 | 16°C | 9°C | 21°C 2018 | 1°C 1991 | 44% |
| Sep 8 | 16°C | 8°C | 22°C 2018 | 3°C 1993 | 46% |
| Sep 9 | 15°C | 8°C | 21°C 2009 | 2°C 2004 | 46% |
| Sep 10 | 15°C | 8°C | 22°C 2019 | 1°C 1993 | 46% |
| Sep 11 | 15°C | 8°C | 19°C 2016 | 4°C 1993 | 45% |
| Sep 12 | 15°C | 8°C | 20°C 2002 | 3°C 2008 | 44% |
| Sep 13 | 14°C | 8°C | 20°C 2006 | 3°C 2008 | 44% |
| Sep 14 | 14°C | 7°C | 19°C 2013 | 1°C 1993 | 44% |
| Sep 15 | 14°C | 7°C | 18°C 2016 | 0°C 1993 | 44% |
| Sep 16 | 14°C | 7°C | 17°C 2014 | 1°C 2000 | 43% |
| Sep 17 | 14°C | 7°C | 18°C 2001 | 2°C 1993 | 41% |
| Sep 18 | 13°C | 7°C | 19°C 2001 | -2°C 1993 | 40% |
| Sep 19 | 13°C | 6°C | 19°C 2001 | 0°C 1993 | 40% |
| Sep 20 | 13°C | 6°C | 18°C 2001 | -2°C 1993 | 39% |
| Sep 21 | 13°C | 6°C | 17°C 2006 | 0°C 2002 | 39% |
| Sep 22 | 13°C | 6°C | 20°C 2006 | 0°C 2002 | 38% |
| Sep 23 | 12°C | 6°C | 20°C 2006 | 0°C 2014 | 37% |
| Sep 24 | 12°C | 6°C | 17°C 2020 | 0°C 1993 | 37% |
| Sep 25 | 12°C | 6°C | 17°C 2020 | -1°C 1993 | 37% |
| Sep 26 | 12°C | 5°C | 17°C 2020 | -3°C 1993 | 37% |
| Sep 27 | 12°C | 5°C | 19°C 2020 | 1°C 2002 | 39% |
| Sep 28 | 11°C | 5°C | 17°C 2020 | -1°C 2002 | 41% |
| Sep 29 | 11°C | 5°C | 15°C 2007 | -2°C 1993 | 42% |
| Sep 30 | 11°C | 5°C | 18°C 2011 | -3°C 1993 | 41% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT+3).
- September 1
- sunrise 6:15 AM, sunset 8:31 PM
- September 30
- sunrise 7:27 AM, sunset 6:59 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 2026-09-25. Sun and moon: computed with the NOAA solar equations and Meeus.