Climate averages 1991–2020
Stellenbosch weather
in September.
A mild, moderately wet month: the 9th warmest and the 8th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in Stellenbosch: daytime highs average 19.0°C and nights cool to about 9.4°C. By daytime temperature it is the 9th warmest of the 12 months.
Expect about 68 mm of rain on roughly 9 days, which makes September a moderately wet month (the 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 51 min on an average September day.
The nearest other city in this atlas is Somerset West (17 km away). In September its highs average 19.0°C, about as warm as Stellenbosch, with 68 mm of rain.
Among the 95 cities listed in South Africa, Stellenbosch ranks joint 91st of 95 for the warmest September highs and joint 93rd of 95 for the driest September (rainfall, lowest first). The mean September high of those 95 cities is 24.3°C; Stellenbosch is 5.2°C cooler than that mean.
From September to October, average highs rise by 3.0°C to 22.0°C, and monthly rainfall falls from 68 mm to 45 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
Stellenbosch climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 28.7°C17.0°C | 17.0°C | 21 | 3.4 | 14.114 h |
| February | 29.2°C17.4°C | 17.4°C | 18 | 3.2 | 13.313 h |
| March | 27.6°C16.4°C | 16.4°C | 21 | 3.5 | 12.312 h |
| April | 24.2°C13.8°C | 13.8°C | 56 | 5.7 | 11.311 h |
| May | 20.6°C11.4°C | 11.4°C | 90 | 9.0 | 10.410 h |
| June | 17.3°C8.6°C | 8.6°C | 138 | 11.0 | 9.910 h |
| July | 17.0°C7.7°C | 7.7°C | 122 | 10.3 | 10.110 h |
| August | 17.2°C8.0°C | 8.0°C | 105 | 10.9 | 10.911 h |
| September, selected | 19.0°C9.4°C | 9.4°C | 68 | 8.8 | 11.912 h |
| October | 22.0°C11.7°C | 11.7°C | 45 | 6.6 | 12.913 h |
| November | 24.1°C13.3°C | 13.3°C | 41 | 5.8 | 13.914 h |
| December | 26.9°C15.7°C | 15.7°C | 24 | 4.2 | 14.414 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
- Somerset West in SeptemberSouth Africa · 17 kmHigh 19.0°C · Low 11.4°C · 68 mm rain
- Paarl in SeptemberSouth Africa · 24 kmHigh 19.9°C · Low 9.1°C · 77 mm rain
- Cape Town in SeptemberSouth Africa · 41 kmHigh 17.9°C · Low 10.8°C · 51 mm rain
- Atlantis in SeptemberSouth Africa · 54 kmHigh 17.9°C · Low 9.0°C · 36 mm rain
- Worcester, South Africa in SeptemberSouth Africa · 63 kmHigh 19.9°C · Low 9.8°C · 35 mm rain
- Mossel Bay in SeptemberSouth Africa · 303 kmHigh 19.3°C · Low 11.2°C · 33 mm rain
- Oudtshoorn in SeptemberSouth Africa · 310 kmHigh 22.2°C · Low 8.3°C · 27 mm rain
- George in SeptemberSouth Africa · 332 kmHigh 18.1°C · Low 10.3°C · 44 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 Stellenbosch) is explained once on the Stellenbosch year overview and on the Sources, method and limits page.
Somerset West lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.