Climate averages 1991–2020
Atlantis weather
in September.
A mild, fairly dry 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 Atlantis: daytime highs average 17.9°C and nights cool to about 9.0°C. By daytime temperature it is the 9th warmest of the 12 months.
Expect about 36 mm of rain on roughly 6 days, which makes September a fairly dry 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 Cape Town (40 km away). In September its highs average 17.9°C, about as warm as Atlantis, with 51 mm of rain.
Among the 95 cities listed in South Africa, Atlantis ranks joint 94th of 95 for the warmest September highs and joint 71st of 95 for the driest September (rainfall, lowest first). The mean September high of those 95 cities is 24.3°C; Atlantis is 6.3°C cooler than that mean.
From September to October, average highs rise by 3.1°C to 21.0°C, and monthly rainfall falls from 36 mm to 23 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
Atlantis climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 26.9°C16.1°C | 16.1°C | 9.8 | 2.2 | 14.114 h |
| February | 27.1°C16.3°C | 16.3°C | 9.8 | 1.9 | 13.313 h |
| March | 25.6°C15.0°C | 15.0°C | 11 | 2.2 | 12.312 h |
| April | 22.6°C12.5°C | 12.5°C | 31 | 4.2 | 11.311 h |
| May | 19.4°C10.3°C | 10.3°C | 47 | 6.5 | 10.410 h |
| June | 16.5°C7.9°C | 7.9°C | 76 | 9.4 | 10.010 h |
| July | 16.1°C7.1°C | 7.1°C | 69 | 8.2 | 10.210 h |
| August | 16.2°C7.5°C | 7.5°C | 59 | 8.4 | 10.911 h |
| September, selected | 17.9°C9.0°C | 9.0°C | 36 | 6.3 | 11.912 h |
| October | 21.0°C11.2°C | 11.2°C | 23 | 4.1 | 12.913 h |
| November | 23.0°C12.8°C | 12.8°C | 21 | 4.0 | 13.814 h |
| December | 25.4°C14.9°C | 14.9°C | 12 | 2.9 | 14.314 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
- Cape Town in SeptemberSouth Africa · 40 kmHigh 17.9°C · Low 10.8°C · 51 mm rain
- Paarl in SeptemberSouth Africa · 49 kmHigh 19.9°C · Low 9.1°C · 77 mm rain
- Stellenbosch in SeptemberSouth Africa · 54 kmHigh 19.0°C · Low 9.4°C · 68 mm rain
- Somerset West in SeptemberSouth Africa · 65 kmHigh 19.0°C · Low 11.4°C · 68 mm rain
- Worcester, South Africa in SeptemberSouth Africa · 90 kmHigh 19.9°C · Low 9.8°C · 35 mm rain
- Oudtshoorn in SeptemberSouth Africa · 344 kmHigh 22.2°C · Low 8.3°C · 27 mm rain
- Mossel Bay in SeptemberSouth Africa · 345 kmHigh 19.3°C · Low 11.2°C · 33 mm rain
- George in SeptemberSouth Africa · 370 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 Atlantis) is explained once on the Atlantis year overview and on the Sources, method and limits page.