Climate averages 1991–2020
Thembisa weather
in December.
A warm, wet month: the joint 3rd warmest and the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a warm month in Thembisa: daytime highs average 25.5°C and nights cool to about 15.0°C. By daytime temperature it is the joint 3rd warmest of the 12 months.
Expect about 116 mm of rain on roughly 16 days, which makes December a wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 13 h 44 min on an average December day.
The nearest other city in this atlas is Midrand (11 km away). In December its highs average 25.2°C, about as warm as Thembisa, with 117 mm of rain.
Among the 95 cities listed in South Africa, Thembisa ranks joint 54th of 95 for the warmest December highs and 55th of 95 for the driest December (rainfall, lowest first). The mean December high of those 95 cities is 26.6°C; Thembisa is 1.2°C cooler than that mean.
From December to January, average highs rise by 0.1°C to 25.6°C, and monthly rainfall falls from 116 mm to 110 mm.
The annual picture
December 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
Thembisa climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 25.6°C15.4°C | 15.4°C | 110 | 15.4 | 13.614 h |
| February | 25.5°C15.2°C | 15.2°C | 97 | 12.7 | 13.013 h |
| March | 24.2°C13.8°C | 13.8°C | 80 | 10.8 | 12.312 h |
| April | 21.8°C10.8°C | 10.8°C | 37 | 6.4 | 11.511 h |
| May | 19.8°C7.2°C | 7.2°C | 14 | 2.6 | 10.911 h |
| June | 17.4°C4.2°C | 4.2°C | 6.5 | 1.2 | 10.511 h |
| July | 17.6°C3.5°C | 3.5°C | 2.7 | 0.6 | 10.711 h |
| August | 20.7°C6.1°C | 6.1°C | 8.3 | 1.6 | 11.211 h |
| September | 24.8°C9.9°C | 9.9°C | 19 | 2.9 | 11.912 h |
| October | 25.7°C12.2°C | 12.2°C | 65 | 9.6 | 12.713 h |
| November | 25.3°C13.6°C | 13.6°C | 88 | 13.2 | 13.413 h |
| December, selected | 25.5°C15.0°C | 15.0°C | 116 | 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
December in nearby cities
- Midrand in DecemberSouth Africa · 11 kmHigh 25.2°C · Low 14.6°C · 117 mm rain
- Centurion in DecemberSouth Africa · 16 kmHigh 26.5°C · Low 16.0°C · 113 mm rain
- Benoni in DecemberSouth Africa · 23 kmHigh 25.0°C · Low 14.5°C · 130 mm rain
- Randburg in DecemberSouth Africa · 25 kmHigh 25.4°C · Low 14.8°C · 117 mm rain
- Germiston in DecemberSouth Africa · 25 kmHigh 25.1°C · Low 14.6°C · 130 mm rain
- Etwatwa in DecemberSouth Africa · 27 kmHigh 25.1°C · Low 14.7°C · 135 mm rain
- Pretoria in DecemberSouth Africa · 28 kmHigh 27.3°C · Low 16.6°C · 113 mm rain
- Johannesburg in DecemberSouth Africa · 29 kmHigh 24.3°C · Low 13.7°C · 138 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 Thembisa) is explained once on the Thembisa year overview and on the Sources, method and limits page.