Trondheim Weather in September
Average highs run from 15°C on September 1 to 10°C on September 30, and lows from 8°C to 5°C. Normal precipitation for the month is 135 mm over about 18 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
- 13°C
- Average low
- 6°C
- Precipitation
- 135 mm
- Reanalysis high
- 22°CSep 3, 1999
- Reanalysis low
- -2°CSep 17, 1993
- Daylight
- 14 h 29 min to 11 h 28 min
- Cloud cover
- 74%
- Humidity
- 88%
- Dew point
- 7°C
- Wind
- 8.6 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 | 15°C | 8°C | 22°C 1991 | 4°C 2003 | 64% |
| Sep 2 | 14°C | 8°C | 20°C 1997 | 4°C 2003 | 62% |
| Sep 3 | 14°C | 8°C | 22°C 1999 | 4°C 2000 | 61% |
| Sep 4 | 14°C | 8°C | 20°C 2013 | 4°C 2000 | 60% |
| Sep 5 | 14°C | 8°C | 20°C 2013 | 3°C 1992 | 59% |
| Sep 6 | 14°C | 7°C | 22°C 2010 | 3°C 1992 | 58% |
| Sep 7 | 14°C | 7°C | 20°C 2014 | 4°C 1991 | 57% |
| Sep 8 | 14°C | 7°C | 21°C 2013 | 3°C 2012 | 56% |
| Sep 9 | 14°C | 7°C | 19°C 2013 | 3°C 1996 | 57% |
| Sep 10 | 13°C | 7°C | 20°C 2015 | 3°C 1996 | 58% |
| Sep 11 | 13°C | 7°C | 19°C 2002 | 1°C 1996 | 58% |
| Sep 12 | 13°C | 7°C | 19°C 1999 | 1°C 1996 | 57% |
| Sep 13 | 13°C | 7°C | 20°C 2016 | 2°C 2000 | 57% |
| Sep 14 | 13°C | 7°C | 20°C 2006 | 0°C 1993 | 58% |
| Sep 15 | 13°C | 7°C | 19°C 2006 | 0°C 1993 | 58% |
| Sep 16 | 13°C | 6°C | 21°C 2016 | -1°C 1993 | 60% |
| Sep 17 | 12°C | 6°C | 17°C 2014 | -2°C 1993 | 61% |
| Sep 18 | 12°C | 6°C | 21°C 2016 | 1°C 2007 | 61% |
| Sep 19 | 12°C | 6°C | 18°C 2001 | -1°C 2007 | 61% |
| Sep 20 | 12°C | 6°C | 19°C 2016 | 1°C 1994 | 62% |
| Sep 21 | 12°C | 6°C | 19°C 2016 | 2°C 2012 | 61% |
| Sep 22 | 11°C | 6°C | 19°C 2006 | 2°C 2014 | 62% |
| Sep 23 | 11°C | 5°C | 19°C 2006 | 1°C 2002 | 60% |
| Sep 24 | 11°C | 5°C | 17°C 1999 | 2°C 2012 | 60% |
| Sep 25 | 11°C | 5°C | 17°C 2017 | 0°C 2013 | 60% |
| Sep 26 | 11°C | 5°C | 19°C 2006 | 0°C 2013 | 59% |
| Sep 27 | 11°C | 5°C | 15°C 2017 | 0°C 2010 | 60% |
| Sep 28 | 11°C | 5°C | 17°C 2020 | 0°C 2003 | 61% |
| Sep 29 | 10°C | 5°C | 17°C 2011 | -1°C 2003 | 61% |
| Sep 30 | 10°C | 5°C | 19°C 2000 | -1°C 1995 | 59% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT+2).
- September 1
- sunrise 6:03 AM, sunset 8:32 PM
- September 30
- sunrise 7:24 AM, sunset 6:52 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.