Knysna Weather in September
Average highs run from 20°C on September 1 to 21°C on September 30, and lows from 10°C to 11°C. Normal precipitation for the month is 39 mm over about 6 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
- 20°C
- Average low
- 11°C
- Precipitation
- 39 mm
- Reanalysis high
- 34°CSep 19, 2019
- Reanalysis low
- 5°CSep 20, 2018
- Daylight
- 11 h 24 min to 12 h 24 min
- Cloud cover
- 46%
- Humidity
- 71%
- 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 | Reanalysis high | Reanalysis low | Chance wet |
|---|---|---|---|---|---|
| Sep 1 | 20°C | 10°C | 28°C 1994 | 7°C 2008 | 22% |
| Sep 2 | 20°C | 10°C | 29°C 2014 | 6°C 2012 | 22% |
| Sep 3 | 20°C | 11°C | 28°C 1999 | 8°C 2003 | 23% |
| Sep 4 | 20°C | 11°C | 30°C 2017 | 7°C 2013 | 23% |
| Sep 5 | 20°C | 11°C | 27°C 2010 | 7°C 2005 | 23% |
| Sep 6 | 20°C | 11°C | 29°C 1999 | 7°C 1991 | 24% |
| Sep 7 | 20°C | 11°C | 30°C 2019 | 7°C 2004 | 22% |
| Sep 8 | 20°C | 11°C | 33°C 2019 | 7°C 2000 | 20% |
| Sep 9 | 20°C | 11°C | 30°C 1993 | 7°C 2018 | 20% |
| Sep 10 | 20°C | 11°C | 28°C 2019 | 5°C 2009 | 21% |
| Sep 11 | 20°C | 11°C | 28°C 2007 | 7°C 1999 | 22% |
| Sep 12 | 20°C | 11°C | 30°C 2020 | 6°C 2013 | 21% |
| Sep 13 | 20°C | 11°C | 31°C 2008 | 7°C 1999 | 20% |
| Sep 14 | 20°C | 11°C | 34°C 2005 | 7°C 2007 | 21% |
| Sep 15 | 20°C | 11°C | 29°C 1995 | 8°C 2000 | 22% |
| Sep 16 | 20°C | 11°C | 30°C 2012 | 10°C 2018 | 23% |
| Sep 17 | 20°C | 11°C | 26°C 2014 | 8°C 1999 | 23% |
| Sep 18 | 20°C | 11°C | 30°C 1992 | 7°C 2006 | 22% |
| Sep 19 | 20°C | 11°C | 34°C 2019 | 7°C 2000 | 22% |
| Sep 20 | 20°C | 11°C | 28°C 1998 | 5°C 2018 | 23% |
| Sep 21 | 20°C | 11°C | 27°C 2004 | 6°C 2018 | 23% |
| Sep 22 | 20°C | 11°C | 31°C 2000 | 7°C 2013 | 25% |
| Sep 23 | 20°C | 11°C | 32°C 2000 | 6°C 1992 | 25% |
| Sep 24 | 20°C | 11°C | 27°C 2020 | 6°C 1992 | 25% |
| Sep 25 | 20°C | 11°C | 28°C 2011 | 7°C 1998 | 25% |
| Sep 26 | 20°C | 11°C | 31°C 2019 | 6°C 1998 | 26% |
| Sep 27 | 20°C | 11°C | 31°C 2019 | 7°C 1996 | 26% |
| Sep 28 | 20°C | 11°C | 27°C 1996 | 6°C 2020 | 27% |
| Sep 29 | 21°C | 11°C | 29°C 2010 | 6°C 1998 | 26% |
| Sep 30 | 21°C | 11°C | 31°C 2001 | 8°C 2020 | 26% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT+2).
- September 1
- sunrise 6:46 AM, sunset 6:10 PM
- September 30
- sunrise 6:06 AM, sunset 6:30 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.