Climate averages 1991–2020
Randburg weather
in May.
A mild, very dry month: the 10th warmest and the 4th driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
May is a mild month in Randburg: daytime highs average 19.6°C and nights cool to about 6.6°C. By daytime temperature it is the 10th warmest of the 12 months.
Expect about 14 mm of rain on roughly 3 days, which makes May a very dry month (the 4th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 10 h 51 min on an average May day.
The nearest other city in this atlas is Johannesburg (13 km away). In May its highs average 18.4°C, 1.2°C cooler than Randburg, with 17 mm of rain.
Among the 95 cities listed in South Africa, Randburg ranks joint 72nd of 95 for the warmest May highs and joint 8th of 95 for the driest May (rainfall, lowest first). The mean May high of those 95 cities is 21.0°C; Randburg is 1.4°C cooler than that mean.
From May to June, average highs fall by 2.4°C to 17.2°C, and monthly rainfall falls from 14 mm to 6.5 mm.
The annual picture
May in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Randburg climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 25.5°C15.2°C | 15.2°C | 108 | 15.0 | 13.614 h |
| February | 25.4°C14.9°C | 14.9°C | 97 | 12.4 | 13.013 h |
| March | 24.1°C13.4°C | 13.4°C | 80 | 11.1 | 12.312 h |
| April | 21.6°C10.3°C | 10.3°C | 37 | 6.4 | 11.511 h |
| May, selected | 19.6°C6.6°C | 6.6°C | 14 | 2.5 | 10.911 h |
| June | 17.2°C3.7°C | 3.7°C | 6.5 | 1.1 | 10.511 h |
| July | 17.4°C3.1°C | 3.1°C | 2.5 | 0.6 | 10.711 h |
| August | 20.5°C5.8°C | 5.8°C | 7.5 | 1.4 | 11.211 h |
| September | 24.6°C9.5°C | 9.5°C | 19 | 2.8 | 11.912 h |
| October | 25.6°C11.9°C | 11.9°C | 61 | 9.3 | 12.713 h |
| November | 25.2°C13.3°C | 13.3°C | 85 | 12.5 | 13.413 h |
| December | 25.4°C14.8°C | 14.8°C | 117 | 16.4 | 13.714 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
May in nearby cities
- Johannesburg in MaySouth Africa · 13 kmHigh 18.4°C · Low 5.7°C · 17 mm rain
- Roodepoort in MaySouth Africa · 15 kmHigh 18.5°C · Low 6.0°C · 18 mm rain
- Midrand in MaySouth Africa · 18 kmHigh 19.5°C · Low 6.7°C · 14 mm rain
- Germiston in MaySouth Africa · 21 kmHigh 19.4°C · Low 6.6°C · 15 mm rain
- Krugersdorp in MaySouth Africa · 23 kmHigh 18.7°C · Low 6.0°C · 16 mm rain
- Alberton in MaySouth Africa · 23 kmHigh 19.6°C · Low 6.8°C · 17 mm rain
- Soweto in MaySouth Africa · 24 kmHigh 19.0°C · Low 6.6°C · 18 mm rain
- Thembisa in MaySouth Africa · 25 kmHigh 19.8°C · Low 7.2°C · 14 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Randburg) is explained once on the Randburg year overview and on the Sources, method and limits page.
Midrand lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.