Johannesburg Weather in May
Average highs run from 24°C on May 1 to 22°C on May 31, and lows from 10°C to 7°C. Normal precipitation for the month is 16 mm over about 3 wet days.
May day by day
The normal high and low for each date, and the record, in °C.
- Normal low
- Normal high
- Record high
- Record low
May at a glance
- Average high
- 23°C
- Average low
- 8°C
- Precipitation
- 16 mm
- Record high
- 30°CMay 2, 2024
- Record low
- -1°CMay 22, 2007
- Daylight
- 11 h 06 min to 10 h 37 min
- Cloud cover
- 25%
- Humidity
- 54%
- Dew point
- 2°C
- Wind
- 11.5 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 |
|---|---|---|---|---|---|
| May 1 | 24°C | 10°C | 28°C 2012 | 5°C 2015 | 14% |
| May 2 | 23°C | 10°C | 30°C 2024 | 7°C 2015 | 13% |
| May 3 | 23°C | 10°C | 30°C 2024 | 4°C 2025 | 13% |
| May 4 | 24°C | 10°C | 28°C 2012 | 7°C 2013 | 13% |
| May 5 | 24°C | 10°C | 29°C 2012 | 7°C 2025 | 12% |
| May 6 | 24°C | 10°C | 29°C 2012 | 4°C 2000 | 11% |
| May 7 | 23°C | 9°C | 29°C 1998 | 2°C 2002 | 11% |
| May 8 | 23°C | 9°C | 29°C 2024 | 0°C 1995 | 11% |
| May 9 | 23°C | 9°C | 29°C 2024 | 0°C 1995 | 10% |
| May 10 | 23°C | 8°C | 27°C 2024 | 4°C 2002 | 10% |
| May 11 | 23°C | 8°C | 30°C 2024 | 3°C 1998 | 9% |
| May 12 | 23°C | 8°C | 30°C 2024 | 3°C 1998 | 8% |
| May 13 | 23°C | 8°C | 27°C 2024 | 1°C 2000 | 8% |
| May 14 | 23°C | 8°C | 27°C 2015 | 3°C 2000 | 7% |
| May 15 | 22°C | 8°C | 27°C 2015 | 3°C 1998 | 7% |
| May 16 | 22°C | 8°C | 27°C 2024 | 4°C 2000 | 6% |
| May 17 | 23°C | 8°C | 29°C 2024 | 5°C 1998 | 6% |
| May 18 | 23°C | 8°C | 29°C 2024 | 4°C 2009 | 6% |
| May 19 | 22°C | 8°C | 27°C 2024 | 5°C 2023 | 6% |
| May 20 | 22°C | 8°C | 26°C 2024 | 4°C 2006 | 6% |
| May 21 | 22°C | 8°C | 28°C 2024 | 2°C 2007 | 6% |
| May 22 | 22°C | 7°C | 28°C 2024 | -1°C 2007 | 6% |
| May 23 | 22°C | 7°C | 25°C 2019 | -1°C 2007 | 5% |
| May 24 | 22°C | 7°C | 25°C 2019 | 0°C 2007 | 5% |
| May 25 | 22°C | 7°C | 25°C 2024 | 1°C 2007 | 5% |
| May 26 | 22°C | 7°C | 25°C 2015 | 3°C 2006 | 5% |
| May 27 | 22°C | 6°C | 26°C 2017 | 2°C 2011 | 4% |
| May 28 | 22°C | 6°C | 26°C 2017 | 1°C 2020 | 4% |
| May 29 | 22°C | 6°C | 25°C 2015 | 4°C 2007 | 4% |
| May 30 | 22°C | 7°C | 26°C 2015 | 3°C 2000 | 4% |
| May 31 | 22°C | 7°C | 26°C 2015 | 4°C 2004 | 4% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT+2).
- May 1
- sunrise 6:32 AM, sunset 5:38 PM
- May 31
- sunrise 6:47 AM, sunset 5:24 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.