Monthly climate guide
Hermanus weather in September
September in Hermanus is typically mild, with average daytime highs around 18°C (65°F) and night-time lows near 11°C (52°F). The month usually brings about 42 mm of rain (fairly dry) and is a mix of sun and cloud. Daytime highs are 2°C warmer than August and 2°C cooler than October.
What stands out in September
- It's one of the greyest months, with cloud cover near 42%.
- Seasonally, September counts as early spring in Hermanus — the seasons are reversed south of the equator.
- Hermanus is usually about 2°C warmer than Cape Town, 90 km away, in September.
Avg high
18°C
65°F
Avg low
11°C
52°F
Rainfall
42 mm
fairly dry
Humidity
77%
relative
Sky
42%
cloud · a mix of sun and cloud
Hermanus weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 26°C / 78°F | 18°C / 64°F | 32 mm | 71% | 34% |
| February | 26°C / 78°F | 17°C / 63°F | 23 mm | 72% | 31% |
| March | 24°C / 75°F | 16°C / 61°F | 40 mm | 75% | 37% |
| April | 22°C / 72°F | 14°C / 57°F | 32 mm | 75% | 35% |
| May | 20°C / 67°F | 13°C / 55°F | 35 mm | 78% | 41% |
| June | 17°C / 63°F | 11°C / 51°F | 81 mm | 78% | 42% |
| July | 17°C / 62°F | 10°C / 50°F | 66 mm | 80% | 38% |
| August | 17°C / 62°F | 10°C / 50°F | 66 mm | 80% | 40% |
| September | 18°C / 65°F | 11°C / 52°F | 42 mm | 77% | 42% |
| October | 21°C / 69°F | 13°C / 55°F | 43 mm | 75% | 41% |
| November | 22°C / 72°F | 14°C / 57°F | 36 mm | 72% | 41% |
| December | 24°C / 76°F | 16°C / 61°F | 16 mm | 71% | 36% |
What to pack for September
- A warm sweater or fleece for layering
- A mid-weight jacket
- A small travel umbrella, just in case
Is September a good time to visit Hermanus?
Compare the months in the chart above to find your ideal window.
Best time to visit Hermanus →Other South Africa cities in September
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Hermanus weather in September. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/south-africa/hermanus/september
<a href="https://weathercompare.eu/weather/south-africa/hermanus/september">Hermanus weather in September</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/south-africa/hermanus" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="Hermanus weather in September"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/south-africa/hermanus/september">Hermanus weather in September</a> – WeatherCompare</p>
Hermanus in September: quick answers
Is September a good time to visit Hermanus?
September is a reasonable time for Hermanus: highs around 18°C and about 42 mm of rain, though not one of the three best months.
How warm is Hermanus in September?
Average highs are about 18°C (65°F) and average lows about 11°C (52°F), based on 10 years of daily data.
Does it rain a lot in Hermanus in September?
Hermanus typically gets around 42 mm of rain in September — fairly dry.
Figures are long-term averages for the area around Hermanus (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.