Climate averages 1991–2020
Johannesburg weather
in April.
A mild, moderately wet month: the 8th warmest and the 6th driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
April is a mild month in Johannesburg: daytime highs average 20.4°C and nights cool to about 9.3°C. By daytime temperature it is the 8th warmest of the 12 months.
Expect about 45 mm of rain on roughly 7 days, which makes April a moderately wet month (the 6th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 29 min on an average April day.
The nearest other city in this atlas is Alberton (11 km away). In April its highs average 21.7°C, 1.2°C warmer than Johannesburg, with 45 mm of rain.
Among the 95 cities listed in South Africa, Johannesburg ranks joint 93rd of 95 for the warmest April highs and joint 55th of 95 for the driest April (rainfall, lowest first). The mean April high of those 95 cities is 23.1°C; Johannesburg is 2.7°C cooler than that mean.
From April to May, average highs fall by 2.1°C to 18.4°C, and monthly rainfall falls from 45 mm to 17 mm.
The annual picture
April 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
Johannesburg climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 24.3°C14.1°C | 14.1°C | 132 | 16.4 | 13.614 h |
| February | 24.1°C13.9°C | 13.9°C | 111 | 14.1 | 13.013 h |
| March | 22.8°C12.3°C | 12.3°C | 89 | 12.7 | 12.312 h |
| April, selected | 20.4°C9.3°C | 9.3°C | 45 | 7.3 | 11.511 h |
| May | 18.4°C5.7°C | 5.7°C | 17 | 2.9 | 10.911 h |
| June | 16.1°C2.9°C | 2.9°C | 7.8 | 1.3 | 10.511 h |
| July | 16.3°C2.2°C | 2.2°C | 3.0 | 0.8 | 10.711 h |
| August | 19.4°C4.9°C | 4.9°C | 9.8 | 2.0 | 11.211 h |
| September | 23.4°C8.5°C | 8.5°C | 22 | 3.7 | 11.912 h |
| October | 24.4°C10.9°C | 10.9°C | 75 | 10.7 | 12.713 h |
| November | 24.1°C12.3°C | 12.3°C | 100 | 14.0 | 13.413 h |
| December | 24.3°C13.7°C | 13.7°C | 138 | 18.0 | 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
April in nearby cities
- Alberton in AprilSouth Africa · 11 kmHigh 21.7°C · Low 10.3°C · 45 mm rain
- Germiston in AprilSouth Africa · 12 kmHigh 21.4°C · Low 10.2°C · 42 mm rain
- Randburg in AprilSouth Africa · 13 kmHigh 21.6°C · Low 10.3°C · 37 mm rain
- Roodepoort in AprilSouth Africa · 18 kmHigh 20.6°C · Low 9.5°C · 45 mm rain
- Tokoza in AprilSouth Africa · 19 kmHigh 21.8°C · Low 10.4°C · 42 mm rain
- Soweto in AprilSouth Africa · 20 kmHigh 21.1°C · Low 10.1°C · 45 mm rain
- Midrand in AprilSouth Africa · 26 kmHigh 21.6°C · Low 10.3°C · 37 mm rain
- Benoni in AprilSouth Africa · 28 kmHigh 21.4°C · Low 10.1°C · 42 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 Johannesburg) is explained once on the Johannesburg year overview and on the Sources, method and limits page.
Alberton lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.