Climate averages 1991–2020
Westonaria weather
in September.
A warm, fairly dry month: the 6th warmest and the 5th driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
September is a warm month in Westonaria: daytime highs average 24.6°C and nights cool to about 9.7°C. By daytime temperature it is the 6th warmest of the 12 months.
Expect about 21 mm of rain on roughly 3 days, which makes September a fairly dry month (the 5th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 55 min on an average September day.
The nearest other city in this atlas is Randfontein (16 km away). In September its highs average 23.8°C, 0.8°C cooler than Westonaria, with 21 mm of rain.
Among the 95 cities listed in South Africa, Westonaria ranks joint 49th of 95 for the warmest September highs and joint 43rd of 95 for the driest September (rainfall, lowest first). The mean September high of those 95 cities is 24.3°C; Westonaria is 0.3°C warmer than that mean.
From September to October, average highs rise by 1.1°C to 25.7°C, and monthly rainfall rises from 21 mm to 73 mm.
The annual picture
September 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
Westonaria climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 25.5°C15.5°C | 15.5°C | 132 | 16.9 | 13.614 h |
| February | 25.2°C15.2°C | 15.2°C | 118 | 14.4 | 13.013 h |
| March | 23.9°C13.7°C | 13.7°C | 90 | 12.8 | 12.312 h |
| April | 21.6°C10.6°C | 10.6°C | 45 | 7.3 | 11.511 h |
| May | 19.5°C7.2°C | 7.2°C | 18 | 3.1 | 10.811 h |
| June | 17.1°C4.0°C | 4.0°C | 8.1 | 1.4 | 10.511 h |
| July | 17.2°C3.2°C | 3.2°C | 3.2 | 0.8 | 10.711 h |
| August | 20.4°C6.0°C | 6.0°C | 9.7 | 1.9 | 11.211 h |
| September, selected | 24.6°C9.7°C | 9.7°C | 21 | 3.4 | 11.912 h |
| October | 25.7°C12.3°C | 12.3°C | 73 | 10.4 | 12.713 h |
| November | 25.4°C13.6°C | 13.6°C | 99 | 13.9 | 13.413 h |
| December | 25.5°C15.1°C | 15.1°C | 141 | 18.4 | 13.814 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
September in nearby cities
- Randfontein in SeptemberSouth Africa · 16 kmHigh 23.8°C · Low 9.0°C · 21 mm rain
- Soweto in SeptemberSouth Africa · 22 kmHigh 24.2°C · Low 9.3°C · 21 mm rain
- Carletonville in SeptemberSouth Africa · 25 kmHigh 25.1°C · Low 10.0°C · 20 mm rain
- Roodepoort in SeptemberSouth Africa · 28 kmHigh 23.6°C · Low 8.5°C · 21 mm rain
- Krugersdorp in SeptemberSouth Africa · 29 kmHigh 23.7°C · Low 8.7°C · 19 mm rain
- Evaton in SeptemberSouth Africa · 31 kmHigh 25.2°C · Low 10.0°C · 20 mm rain
- Johannesburg in SeptemberSouth Africa · 41 kmHigh 23.4°C · Low 8.5°C · 22 mm rain
- Randburg in SeptemberSouth Africa · 43 kmHigh 24.6°C · Low 9.5°C · 19 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 Westonaria) is explained once on the Westonaria year overview and on the Sources, method and limits page.
Soweto, Roodepoort and Randfontein lie in the same rainfall cell, so their rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.