SeasonMapKnysna weather in September
South Africa
September in Knysna: nice, a little rain, with clean air — a great time to visit.
#9 of 12 months in Knysna · #719 of 1383 destinations to visit in September · comfort 79/100 (tier B)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on Knysna in September
Other months in Knysna
Knysna's forum calls January part of the warm, busy summer season, though a few visitors have found it wetter than the brochures suggest, with scattered rain days breaking up the sunshine rather than a fully dry stretch. Regulars still rate it a good month overall — just pack for the odd shower alongside the swimwear.
Add your own note from Knysna's card on the map.
Knysna climate normals — September
| Daytime high | 19°C / 67°F | 😎 nice |
|---|---|---|
| Nighttime low | 13°C / 55°F | |
| Feels like (high) | 18°C / 64°F | |
| Sea temperature | 17°C / 62°F | 🧊 bracing |
| Rainfall | 61 mm / 2.4 in | 🌦 some rain |
| Rainy days | 8 days | |
| Humidity | 75% | 💦 very humid |
| Dew point | 11°C / 52°F | |
| Sunshine | 10 h/day | |
| Daylight | 11.9 h | |
| Wind | 22 km/h / 14 mph | |
| Air quality (US AQI) | 31 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Knysna 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.
Peak crowdsPink Loerie Mardi Gras, Term 3–4 (spring) break in South Africa(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Knysna'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 weatherKnysna's weather doesn't swing hard through the year — comfort stays fairly steady in every month.
What's on in Knysna in September
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Hazard
Berg wind fire risk
1 May – 30 Nov · usuallySmoke seasonClosuresHot, dry berg winds off the interior are what turn a plantation fire into the kind that burned through the town in June 2017. The danger travels with the wind rather than the season, and the worst days come in winter and spring. Source ↗
- Nature
Southern right whales
15 Jun – 15 Nov · usuallyWhale seasonSouthern rights work the coast between the Heads and Buffalo Bay through winter and spring. The viewpoints on the eastern Head are the free way to watch them, and no boat gets closer.
- Festival
Pink Loerie Mardi Gras
24–27 SepPrideCrowdedKnysna's pride and arts festival, moved off its old Easter slot to the Heritage Day weekend. The main street closes for the parade and the town's beds go early. Source ↗
Nearby, and something's on
Within 300 km of Knysna — a day trip or a short hop — with something on this month. Never part of the comfort score.
Where is Knysna?
Knysna in September — FAQ
- Is September a good time to visit Knysna?
- September in Knysna: nice, a little rain, with clean air — a great time to visit. It ranks #9 of 12 months for Knysna on SeasonMap's comfort score (79/100).
- What is the weather like in Knysna in September?
- In September, Knysna averages a daily high of 19.3°C and a low of 12.5°C, with about 60.9 mm of rain over roughly 8.3 rainy days.
- What is the air quality in Knysna in September?
- Knysna has a mean US Air Quality Index of about 31 in September.
Other months in Knysna
Compare Knysna in September
Warmer or cooler than Knysna in September
Similar destinations in Southern Africa — September
Within 300 km: Port Elizabeth's Whales in Algoa Bay around 1 Jun – 30 Nov.