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South Africa weather

Weather in Cape Town for September 2026

Your guide to Cape Town weather in September - trends and predictions

    Temperatures

  • So far, September 2026 in Cape Town is slightly warmer than the historical average by 1.9 °C.

  • The forecast for the next days in Cape Town predicts temperatures to be around 19 °C, close to the historical average.

  • In general, the average temperature in Cape Town at the beginning of September is 17.7 °C. As the month progressed, temperatures tended to moderately rise, reaching an average of 18.9 °C by the end of September.

    • Rain 🌧️

  • With an average of 5 rainy days, Cape Town experiences minimal rainfall in September.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
25
Dry days
Average rainy days
5
Rainy days
Average snowy days
0
Snow days
Average temperatures
18°/10°
Temperatures
Average wind speed
20 km/h
Avg max wind
Average humidity
68 %
Avg humidity

Cape Town Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Overcast
18°
2
Sunny
19°
3
Patchy rain possible
17°
4
Partly cloudy
17°
5
Patchy rain possible
16°
6
Sunny
17°
7
Sunny
20°
8
Partly cloudy
21°
9
Sunny
21°
10
Sunny
19°
11
Sunny
18°
12
Overcast
18°
13
Thundery outbreaks possible
20°
14
Patchy rain possible
20°
15
Patchy rain possible
18°
16
Light rain shower
14°
17
Sunny
17°
18
Sunny
17°
19
Sunny
18°
20
Sunny
22°
21
Sunny
26°
22
Overcast
23°
23
Patchy rain possible
16°
24
Patchy rain possible
15°
25
Sunny
16°
26
Partly cloudy
20°
27
Sunny
20°
28
Sunny
20°
29
Sunny
20°
30
Light rain shower
21°

Temperatures trend during September in Cape Town

See the weather trend as well as the moving average line

September weather in Cape Town day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Overcast
Overcast
 18° /9° 0.1 mm 5
2 Sept. Sunny
Sunny
 19° /10° 1.4 mm 5
3 Sept. Patchy rain possible
Patchy rain possible
 17° /10° 1.3 mm 5
4 Sept. Partly cloudy
Partly cloudy
 17° /10° 2.6 mm 5
5 Sept. Patchy rain possible
Patchy rain possible
 16° /10° 5.1 mm 4
6 Sept. Sunny
Sunny
 17° /9° 0 mm 5
7 Sept. Sunny
Sunny
 20° /10° 0 mm 6
8 Sept. Partly cloudy
Partly cloudy
 21° /11° 0.1 mm 5
9 Sept. Sunny
Sunny
 21° /11° 0.1 mm 6
10 Sept. Sunny
Sunny
 19° /10° 3.7 mm 5
11 Sept. Sunny
Sunny
 18° /10° 3.4 mm 5
12 Sept. Overcast
Overcast
 18° /15° 0.8 mm 2.2
13 Sept. Thundery outbreaks possible
Thundery outbreaks possible
 20° /15° 4 mm 5.3
14 Sept. Patchy rain possible
Patchy rain possible
 20° /15° 5.1 mm 3.4
15 Sept. Patchy rain possible
Patchy rain possible
 18° /14° 4.4 mm 7
16 Sept. Light rain shower
Light rain shower
 14° /13° 21.7 mm 5
17 Sept. Sunny
Sunny
 17° /12° 0 mm 6
18 Sept. Sunny
Sunny
 17° /13° 0 mm 6
19 Sept. Sunny
Sunny
 18° /13° 0 mm 6
20 Sept. Sunny
Sunny
 22° /12° 0 mm 7
21 Sept. Sunny
Sunny
 26° /15° 0 mm 8
22 Sept. Overcast
Overcast
 23° /15° 0.1 mm 6
23 Sept. Patchy rain possible
Patchy rain possible
 16° /13° 0.7 mm 6
24 Sept. Patchy rain possible
Patchy rain possible
 15° /12° 2.2 mm 5
25 Sept. Sunny
Sunny
 16° /12° 0.1 mm 6
26 Sept. Partly cloudy
Partly cloudy
 20° /11° 0.3 mm 6
27 Sept. Sunny
Sunny
 20° /11° 0 mm 6
28 Sept. Sunny
Sunny
 20° /11° 1.8 mm 6
29 Sept. Sunny
Sunny
 20° /12° 1.3 mm 6
30 Sept. Light rain shower
Light rain shower
 21° /11° 3.6 mm 6
Next
Important Notice
Our weather forecast for Cape Town in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Cape Town forecast closer to your planned date for the most up-to-date weather information.
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Cape Town in September - FAQ

What are the expected maximum and minimum temperatures in Cape Town during September?
Enjoy moderate daytime temperatures of up to 18° and cooler nights around 10°. Ideal for a range of outdoor activities, from hiking to city tours.

How much rainfall should be expected in Cape Town during September?
Moderate rainfall is anticipated in Cape Town during September, with a total of 52.3 mm spread over approximately 5 days. Considering plans for rainy days is advisable.

What are the typical wind conditions in Cape Town during September?
The average wind speed in Cape Town during September is 20 km/h, suggesting breezy to windy conditions, depending on your activities.

Cape Town water temperatures in September

The average water temperature of the Atlantic Ocean near Cape Town in September is 12.6 °C. Temperatures remain fairly consistent throughout the month.

What is the water temperature in Cape Town in September?
The average water temperature in Cape Town in September is 12.6 °C.
Can you swim in Cape Town in September?
Cold enough that you lose heat fast. A full 4–5 mm wetsuit (plus hood/gloves for comfort) is advisable for anything beyond a brief plunge.

September rainfall patterns in Cape Town

Explore the daily rainfall trends and prepare for Cape Towns September weather 💧
Typically, Cape Town has 5 rainy days in September with a total of 52.3 mm of rainfall.

UV exposure in Cape Town during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️

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Get accurate weather forecasts for Cape Town, located at latitude -33.926 and longitude 18.423. Stay updated with localized weather information tailored for Cape Town.

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