Climate averages 1991–2020
Grahamstown weather
in September.
A mild, moderately wet month: the joint 8th 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 mild month in Grahamstown: daytime highs average 21.9°C and nights cool to about 9.2°C. By daytime temperature it is the joint 8th warmest of the 12 months.
Expect about 40 mm of rain on roughly 6 days, which makes September a moderately wet month (the 5th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 52 min on an average September day.
The nearest other city in this atlas is Qonce (93 km away). In September its highs average 22.4°C, 0.6°C warmer than Grahamstown, with 48 mm of rain.
Among the 95 cities listed in South Africa, Grahamstown ranks 81st of 95 for the warmest September highs and joint 77th of 95 for the driest September (rainfall, lowest first). The mean September high of those 95 cities is 24.3°C; Grahamstown is 2.4°C cooler than that mean.
From September to October, average highs rise by 0.7°C to 22.5°C, and monthly rainfall rises from 40 mm to 56 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
Grahamstown climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 26.8°C16.1°C | 16.1°C | 63 | 9.2 | 14.114 h |
| February | 27.0°C16.5°C | 16.5°C | 64 | 9.9 | 13.313 h |
| March | 25.9°C15.3°C | 15.3°C | 59 | 8.7 | 12.312 h |
| April | 23.6°C12.6°C | 12.6°C | 49 | 8.1 | 11.311 h |
| May | 21.9°C10.1°C | 10.1°C | 22 | 5.0 | 10.410 h |
| June | 19.6°C7.5°C | 7.5°C | 22 | 4.0 | 10.010 h |
| July | 19.6°C6.9°C | 6.9°C | 22 | 3.6 | 10.210 h |
| August | 20.3°C7.6°C | 7.6°C | 35 | 5.9 | 10.911 h |
| September, selected | 21.9°C9.2°C | 9.2°C | 40 | 6.2 | 11.912 h |
| October | 22.5°C11.1°C | 11.1°C | 56 | 8.9 | 12.913 h |
| November | 23.7°C12.6°C | 12.6°C | 60 | 9.2 | 13.814 h |
| December | 25.6°C14.8°C | 14.8°C | 62 | 9.8 | 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
- Qonce in SeptemberSouth Africa · 93 kmHigh 22.4°C · Low 10.3°C · 48 mm rain
- Bhisho in SeptemberSouth Africa · 99 kmHigh 22.1°C · Low 9.6°C · 56 mm rain
- Motherwell in SeptemberSouth Africa · 103 kmHigh 21.0°C · Low 11.6°C · 31 mm rain
- Gqeberha in SeptemberSouth Africa · 112 kmHigh 19.2°C · Low 13.6°C · 38 mm rain
- Kariega in SeptemberSouth Africa · 116 kmHigh 21.5°C · Low 11.2°C · 31 mm rain
- Mdantsane in SeptemberSouth Africa · 123 kmHigh 21.7°C · Low 11.9°C · 48 mm rain
- East London in SeptemberSouth Africa · 132 kmHigh 21.6°C · Low 14.3°C · 57 mm rain
- Queenstown in SeptemberSouth Africa · 160 kmHigh 23.4°C · Low 7.8°C · 33 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 Grahamstown) is explained once on the Grahamstown year overview and on the Sources, method and limits page.