Cape Town weather in September
September in Cape Town: nice, a little rain, with very humid — an excellent time to visit.
#8 of 12 months in Cape Town · #161 of 604 destinations to visit in September · comfort 86/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Cape Town climate normals — September
| Daytime high | 18°C / 65°F | 😎 nice |
|---|---|---|
| Nighttime low | 11°C / 51°F | |
| Feels like (high) | 17°C / 63°F | |
| Rainfall | 38 mm / 1.5 in | 🌦 some rain |
| Rainy days | 7 days | |
| Humidity | 77% | 💦 very humid |
| Dew point | 9°C / 49°F | |
| Sunshine | 10.1 h/day | |
| Daylight | 11.9 h | |
| Wind | 22 km/h / 13 mph | |
| Air quality (US AQI) | 59 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Where is Cape Town?
Loading map…
Cape Town in September — FAQ
- Is September a good time to visit Cape Town?
- September in Cape Town: nice, a little rain, with very humid — an excellent time to visit. It ranks #8 of 12 months for Cape Town on SeasonMap's comfort score (86/100).
- What is the weather like in Cape Town in September?
- In September, Cape Town averages a daily high of 18.1°C and a low of 10.8°C, with about 38.1 mm of rain over roughly 6.6 rainy days.
- What is the air quality in Cape Town in September?
- Cape Town has a mean US Air Quality Index of about 59 in September.