Cape Town, South Africa skyline

Cape Town Weather in September

What September is usually like in Cape Town, South Africa — from 2006–2025 averages.

Expect Cape Town to reach about 17.9°C (64.2°F) by day and 10.9°C (51.6°F) at night in September, with 7 rainy days bringing 44 mm and around 10.2 hours of sunshine each day.

Avg high

17.9°C (64.2°F)

Avg low

10.9°C (51.6°F)

Rainfall

44 mm (1.7 in)

Rainy days

7 days

Sunshine

10.2 h / day

Humidity

77%

September vs the rest of the year

September is warmer than 3 of the other 11 months, and the 5th wettest month in Cape Town.

MonthAvg highvs SeptemberRainRainy days
January25.9°C (78.6°F)+8°C (+14.4°F)11 mm3
February25.9°C (78.6°F)+8°C (+14.4°F)12 mm2
March24.5°C (76.1°F)+6.6°C (+11.9°F)23 mm4
April22.3°C (72.1°F)+4.4°C (+7.9°F)34 mm4
May19.3°C (66.7°F)+1.4°C (+2.5°F)66 mm8
June17.1°C (62.8°F)−0.8°C (−1.4°F)112 mm11
July16.4°C (61.5°F)−1.5°C (−2.7°F)96 mm10
August16.5°C (61.7°F)−1.4°C (−2.5°F)83 mm10
September17.9°C (64.2°F)—44 mm7
October20.8°C (69.4°F)+2.9°C (+5.2°F)28 mm5
November22.4°C (72.3°F)+4.5°C (+8.1°F)29 mm5
December24.3°C (75.7°F)+6.4°C (+11.5°F)20 mm4

What September feels like in Cape Town

In Cape Town, September brings early spring (Cape Town is in the southern hemisphere, so the seasons run opposite to Europe and North America). Afternoons are cool, pleasant for walking as long as you keep a layer on. The gap between afternoon and night is small, so nights are cool and the temperature hardly changes after dark. Moisture in the air gives the cold a damp edge.

Rain in Cape Town in September

Wet days are occasional rather than regular, about one day in 4. Wet days average about 6.3 mm (0.2 in), enough to soak you without an umbrella. That is close to Cape Town's typical rain per wet day for the whole year (about 7.6 mm).

Daylight and sunshine in September

In mid-September, sunrise is at about 6:47 am and sunset at about 6:37 pm (local time) — 11 h 50 min of daylight. Since mid-August the day has gained 1 h 1 min. About 86% of daylight hours are sunny; in short, skies are mostly clear.

How September compares to the rest of the year

Ranked by average high, September comes out as the 4th coolest month in Cape Town. Compared with August, afternoons are 1.4°C (2.5°F) warmer, with 39 mm less rain. Temperatures keep climbing into October. The next month's average high: 20.8°C (69.4°F).

Who September suits

  • Sightseeing: a good fit — daytime temperatures are fine for walking around.
  • Parks & outdoor: a good fit — pleasant for gardens, parks and riversides.
  • Beach: less ideal — the sea air is too cool.
  • Hiking: less ideal — trails are cool.

Tips for visiting Cape Town in September

Light Jacket

Cool days — a light jacket or sweater for walking around.

Sunglasses

Frequent sunshine — sunglasses and a light hat.

Quick questions

How warm is Cape Town in September?

Afternoons average 17.9°C (64.2°F) and nights about 10.9°C (51.6°F) — cool by most people's standards. It is the 4th coolest month of the year.

Does it rain a lot in Cape Town in September?

Only moderately: roughly 7 wet days and 44 mm, usually moderate rain.

What should I wear in Cape Town in September?

The numbers point to a light jacket and sunglasses. Evenings feel similar to the day, so the same clothes work from morning to night.

Is September or October better for visiting Cape Town?

October scores better on our climate ranking (#7 of 12 vs #9), rated Great against Good. October is warmer and has fewer rainy days.

Is September a good time to visit Cape Town?

Good

Good — mild but cool days, some rainy days (about 7), plenty of sunshine (10.2 h a day). Within Cape Town's own year, September ranks #9 of 12.

September in other South Africa cities

Warmer or drier places in September

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Monthly averages from 20 years of Open-Meteo history (2006–2025), not a forecast — see all 12 months in Cape Town weather by month.