SeasonMapHermanus weather in September
South Africa
September in Hermanus: nice, a little rain, with clean air — a great time to visit.
#8 of 12 months in Hermanus · #746 of 1383 destinations to visit in September · comfort 78/100 (tier B)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on Hermanus in September
Other months in Hermanus
Hermanus's forum is upfront that January is the wrong month for the whale watching the town is famous for — the season runs June through December, peaking in August and September, so January visitors mostly miss out bar the occasional early mother-calf pair. Regulars say it's still worth the stop for the cliff path, galleries and cafes even without the whales.
Add your own note from Hermanus's card on the map.
Hermanus climate normals — September
| Daytime high | 20°C / 69°F | 😎 nice |
|---|---|---|
| Nighttime low | 12°C / 53°F | |
| Feels like (high) | 19°C / 66°F | |
| Sea temperature | 15°C / 59°F | 🥶 cold sea |
| Rainfall | 53 mm / 2.1 in | 🌦 some rain |
| Rainy days | 8 days | |
| Humidity | 77% | 💦 very humid |
| Dew point | 10°C / 50°F | |
| Sunshine | 9.7 h/day | |
| Daylight | 11.9 h | |
| Wind | 17 km/h / 11 mph | |
| Air quality (US AQI) | 37 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Hermanus in September
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
BusyTerm 3–4 (spring) break in South Africa(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Hermanus's weather
Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).
Fair weatherHermanus's weather peaks December–February.
Best weatherFair weatherToughest weather
What's on in Hermanus in September
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Nature
Southern right whales
1 Jun – 30 Nov · usuallyWhale seasonSouthern rights come into Walker Bay to calve and stay close enough to the cliff path to watch without a boat. The town keeps a whale crier who blows a kelp horn when they are in; September and October are the thick of it.
- Festival
Fernkloof flower show
24–27 SepWildflowers & bloomsThe botanical society's fynbos show at Fernkloof over the last weekend of September, running for more than sixty years. The reserve on the slope above the town is in flower at the same time. Source ↗
Nearby, and something's on
Within 300 km of Hermanus — a day trip or a short hop — with something on this month. Never part of the comfort score.
Where is Hermanus?
Hermanus in September — FAQ
- Is September a good time to visit Hermanus?
- September in Hermanus: nice, a little rain, with clean air — a great time to visit. It ranks #8 of 12 months for Hermanus on SeasonMap's comfort score (78/100).
- What is the weather like in Hermanus in September?
- In September, Hermanus averages a daily high of 20.3°C and a low of 11.8°C, with about 53 mm of rain over roughly 7.7 rainy days.
- What is the air quality in Hermanus in September?
- Hermanus has a mean US Air Quality Index of about 37 in September.
Other months in Hermanus
Compare Hermanus in September
Warmer or cooler than Hermanus in September
Similar destinations in Southern Africa — September
Within 300 km: Cape Town's Southern right whales around 1 Jun – 30 Nov.