🇿🇦 Weather in Cape Town in September
This is what the weather in Cape Town (South Africa) was like in September in 2017–2026.
Key facts at a glance
Avg. daytime high
16.4 °C
15.3 °C – 18.2 °C
Avg. night-time low
13.5 °C
12.3 °C – 15.1 °C
Avg. rain days in period
8.0
27 % of days · ≥ 1.0 mm
Avg. precipitation in period
51.8 mm
17.8 mm – 149 mm
Avg. sunshine per day
n/a
Sunshine duration is not available from this data source.
Avg. sea temperature
–
Sea temperature unavailable for today (daily limit).
Extremes: Highest temperature 25.4 °C (30 Sep 2026) · Lowest temperature 10.9 °C (12 Sep 2023) · Avg. daily peak wind 29 km/h
Weather mix of all days
- 139Sunny
- 41Partly cloudy
- 17Cloudy
- 56Light rain
- 24Rain
Summary
- On average 16.4 °C during the day and 13.5 °C at night.
- On average 8.0 rain days (Rain day = at least 1.0 mm of precipitation) with 51.8 mm of precipitation in total.
- Prevailing: Sunny.
- Warmest year: 2019 (avg. 18.2 °C), coolest: 2023 (avg. 15.3 °C).
- Wettest year: 2023 (149 mm), driest: 2021 (17.8 mm).
- Extremes: 25.4 °C on 30 Sep 2026 and 10.9 °C on 12 Sep 2023.
Overall values from all 10 years. How is this calculated?
Charts
Temperatures per year
Average over your travel period
Precipitation & rain days
Year by year
2026
Avg. max17.7°Avg. min13.9°- Rain days
- 7 Rain days
- Precipitation
- 60.7 mm
- Avg. sunshine per day
- n/a
- Sea temperature
- –
Max 25.4 °C · Min 12.1 °C
2025
Avg. max16.7°Avg. min13.9°- Rain days
- 4 Rain days
- Precipitation
- 20.1 mm
- Avg. cloud cover
- 30 % cloudy
- Sea temperature
- –
Max 21.3 °C · Min 12.9 °C
2024
Avg. max15.4°Avg. min12.3°- Rain days
- 5 Rain days
- Precipitation
- 43.9 mm
- Avg. cloud cover
- 27 % cloudy
- Sea temperature
- –
Max 19.6 °C · Min 11.5 °C
2023
Avg. max15.3°Avg. min12.9°- Rain days
- 17 Rain days
- Precipitation
- 149 mm
- Avg. cloud cover
- 43 % cloudy
- Sea temperature
- –
Max 19.4 °C · Min 10.9 °C
2022
Avg. max16.0°Avg. min13.6°- Rain days
- 5 Rain days
- Precipitation
- 40.8 mm
- Avg. cloud cover
- 34 % cloudy
- Sea temperature
- –
Max 18.2 °C · Min 12.3 °C
2021
Avg. max16.1°Avg. min12.9°- Rain days
- 5 Rain days
- Precipitation
- 17.8 mm
- Avg. cloud cover
- 24 % cloudy
- Sea temperature
- –
Max 20.9 °C · Min 11.4 °C
2020
Avg. max15.9°Avg. min13.3°- Rain days
- 10 Rain days
- Precipitation
- 56.2 mm
- Avg. cloud cover
- 32 % cloudy
- Sea temperature
- –
Max 18.8 °C · Min 11.6 °C
2019
Avg. max18.2°Avg. min15.1°- Rain days
- 9 Rain days
- Precipitation
- 25.5 mm
- Avg. cloud cover
- 36 % cloudy
- Sea temperature
- –
Max 23.7 °C · Min 13.4 °C
2018
Avg. max15.7°Avg. min13.2°- Rain days
- 14 Rain days
- Precipitation
- 78.7 mm
- Avg. cloud cover
- 36 % cloudy
- Sea temperature
- –
Max 20.1 °C · Min 11.6 °C
2017
Avg. max16.8°Avg. min13.7°- Rain days
- 4 Rain days
- Precipitation
- 25.4 mm
- Avg. cloud cover
- 33 % cloudy
- Sea temperature
- –
Max 19.6 °C · Min 12.4 °C
Frequently asked questions
- How warm is it in Cape Town in September?
- Daytime highs averaged 16.4 °C, night-time lows 13.5 °C. The highest value of the past 10 years was 25.4 °C (30 Sep 2026), the lowest 10.9 °C (12 Sep 2023).
- How often does it rain in Cape Town in September?
- On average there were 8.0 rain days (at least 1 mm) with 51.8 mm of precipitation in total.
Check your exact travel dates
Choose your travel period – we show the weather for exactly those days.
Other destinations in September
Data sources
- Weather data
- Data obtained from the NASA Langley Research Center (LaRC) POWER Project funded through the NASA Earth Science/Applied Science Program
Reanalysis (weather model constrained by observations) on a coarse grid of about 50 km. Values represent a large area and can differ from local conditions, especially on islands, coasts and in mountains. No sunshine duration.
Reanalysis (weather model constrained by observations)
Reanalysis values represent a grid cell (approx. 25–50 km) and may differ from local measurements on coasts, islands and in mountains. - Sea temperature
- MUR SST data were provided by JPL under support by NASA MEaSUREs program; accessed via NOAA CoastWatch ERDDAP
Daily multi-scale ultra-high resolution (≈ 1 km) analysis of satellite measurements (infrared, microwave) and in-situ data. Represents the foundation temperature below the daily warm surface layer. (Satellite and in-situ analysis) - Place search
- Natural Earth (public domain) · GeoNames (CC BY 4.0) / OpenStreetMap (ODbL)