Fort St. John Weather in September
Average highs run from 18°C on September 1 to 12°C on September 30, and lows from 7°C to 2°C. Normal precipitation for the month is 48 mm over about 9 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
- 15°C
- Average low
- 4°C
- Precipitation
- 48 mm
- Reanalysis high
- 30°CSep 3, 2006
- Reanalysis low
- -7°CSep 13, 2018
- Daylight
- 13 h 50 min to 11 h 35 min
- Cloud cover
- 67%
- Humidity
- 73%
- Dew point
- 4°C
- Wind
- 7.2 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 | Reanalysis high | Reanalysis low | Chance wet |
|---|---|---|---|---|---|
| Sep 1 | 18°C | 7°C | 27°C 2009 | 1°C 2000 | 35% |
| Sep 2 | 18°C | 7°C | 28°C 2006 | 1°C 2000 | 36% |
| Sep 3 | 18°C | 6°C | 30°C 2006 | 0°C 2015 | 36% |
| Sep 4 | 17°C | 6°C | 29°C 2006 | 0°C 2015 | 36% |
| Sep 5 | 17°C | 6°C | 28°C 2017 | -1°C 1992 | 36% |
| Sep 6 | 17°C | 6°C | 30°C 2017 | -3°C 1992 | 36% |
| Sep 7 | 17°C | 6°C | 27°C 2013 | 0°C 2014 | 35% |
| Sep 8 | 17°C | 5°C | 28°C 2006 | -3°C 2014 | 35% |
| Sep 9 | 16°C | 5°C | 25°C 1995 | -4°C 2014 | 34% |
| Sep 10 | 16°C | 5°C | 23°C 2020 | -5°C 2014 | 34% |
| Sep 11 | 16°C | 5°C | 28°C 2013 | -3°C 2014 | 34% |
| Sep 12 | 16°C | 5°C | 29°C 2013 | -5°C 2018 | 32% |
| Sep 13 | 16°C | 5°C | 27°C 2009 | -7°C 2018 | 31% |
| Sep 14 | 15°C | 4°C | 24°C 2013 | -5°C 2018 | 30% |
| Sep 15 | 15°C | 4°C | 28°C 2013 | -5°C 1992 | 29% |
| Sep 16 | 15°C | 4°C | 26°C 2014 | -3°C 2003 | 28% |
| Sep 17 | 15°C | 4°C | 24°C 2012 | -5°C 2003 | 27% |
| Sep 18 | 15°C | 4°C | 21°C 1991 | -3°C 2007 | 28% |
| Sep 19 | 15°C | 4°C | 24°C 1999 | -4°C 2007 | 27% |
| Sep 20 | 15°C | 4°C | 26°C 2012 | -4°C 1993 | 27% |
| Sep 21 | 15°C | 4°C | 27°C 2012 | -5°C 2018 | 27% |
| Sep 22 | 14°C | 3°C | 26°C 2012 | -5°C 2018 | 26% |
| Sep 23 | 14°C | 3°C | 27°C 2012 | -3°C 2018 | 26% |
| Sep 24 | 14°C | 3°C | 25°C 1995 | -3°C 1992 | 27% |
| Sep 25 | 14°C | 3°C | 25°C 1995 | -4°C 1992 | 28% |
| Sep 26 | 13°C | 3°C | 24°C 1995 | -4°C 1992 | 28% |
| Sep 27 | 13°C | 2°C | 24°C 1991 | -3°C 1992 | 27% |
| Sep 28 | 13°C | 2°C | 22°C 2017 | -5°C 2019 | 28% |
| Sep 29 | 13°C | 2°C | 21°C 2017 | -6°C 2018 | 28% |
| Sep 30 | 12°C | 2°C | 24°C 2008 | -6°C 2018 | 30% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (MST).
- September 1
- sunrise 6:08 AM, sunset 7:58 PM
- September 30
- sunrise 7:05 AM, sunset 6:40 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.