Johannesburg Weather in September
Average highs run from 25°C on September 1 to 27°C on September 30, and lows from 9°C to 12°C. Normal precipitation for the month is 18 mm over about 3 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
- 27°C
- Average low
- 11°C
- Precipitation
- 18 mm
- Record high
- 34°CSep 19, 2018
- Record low
- 0°CSep 5, 2015
- Daylight
- 11 h 34 min to 12 h 18 min
- Cloud cover
- 29%
- Humidity
- 40%
- Dew point
- 1°C
- Wind
- 15.1 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 | 25°C | 9°C | 30°C 2007 | 1°C 2013 | 6% |
| Sep 2 | 25°C | 9°C | 31°C 2007 | 4°C 2013 | 6% |
| Sep 3 | 26°C | 9°C | 31°C 2007 | 6°C 2004 | 6% |
| Sep 4 | 26°C | 10°C | 30°C 2023 | 6°C 2004 | 6% |
| Sep 5 | 26°C | 10°C | 31°C 2023 | 0°C 2015 | 6% |
| Sep 6 | 26°C | 10°C | 31°C 2023 | 5°C 1995 | 7% |
| Sep 7 | 26°C | 10°C | 31°C 2007 | 1°C 2004 | 8% |
| Sep 8 | 26°C | 10°C | 32°C 2016 | 3°C 2004 | 8% |
| Sep 9 | 27°C | 11°C | 33°C 2008 | 3°C 2018 | 8% |
| Sep 10 | 28°C | 11°C | 33°C 2008 | 3°C 2002 | 8% |
| Sep 11 | 27°C | 10°C | 33°C 2017 | 1°C 1999 | 8% |
| Sep 12 | 26°C | 11°C | 32°C 2017 | 4°C 2002 | 8% |
| Sep 13 | 27°C | 11°C | 33°C 2024 | 3°C 2004 | 8% |
| Sep 14 | 27°C | 10°C | 33°C 2024 | 5°C 2002 | 8% |
| Sep 15 | 26°C | 11°C | 32°C 2024 | 5°C 2001 | 9% |
| Sep 16 | 27°C | 12°C | 32°C 2024 | 6°C 2001 | 9% |
| Sep 17 | 28°C | 12°C | 32°C 2024 | 7°C 2021 | 9% |
| Sep 18 | 28°C | 11°C | 34°C 2018 | 5°C 2006 | 9% |
| Sep 19 | 27°C | 34°C 2018 | 6°C 2006 | 9% | |
| Sep 20 | 26°C | 11°C | 34°C 2018 | 6°C 2000 | 9% |
| Sep 21 | 27°C | 11°C | 31°C 2020 | 3°C 2008 | 9% |
| Sep 22 | 27°C | 11°C | 34°C 2023 | 5°C 2008 | 10% |
| Sep 23 | 27°C | 12°C | 32°C 2017 | 7°C 2024 | 10% |
| Sep 24 | 29°C | 13°C | 32°C 2017 | 8°C 2024 | 13% |
| Sep 25 | 28°C | 13°C | 32°C 2005 | 7°C 2011 | 15% |
| Sep 26 | 29°C | 12°C | 34°C 2021 | 3°C 2019 | 17% |
| Sep 27 | 28°C | 12°C | 34°C 2021 | 6°C 2019 | 17% |
| Sep 28 | 28°C | 12°C | 32°C 2018 | 5°C 2001 | 18% |
| Sep 29 | 28°C | 11°C | 33°C 2015 | 0°C 1999 | 18% |
| Sep 30 | 27°C | 12°C | 33°C 2015 | 8°C 1999 | 19% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT+2).
- September 1
- sunrise 6:21 AM, sunset 5:55 PM
- September 30
- sunrise 5:49 AM, sunset 6:07 PM
Other months
Sources
Records: NOAA GHCN-Daily, station SFM00068263, 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.