Early spring · Weather & things to do
Knysna & Plettenberg Bay in September
Knysna & Plettenberg Bay edges warmer than August, with highs of 71°F (22°C), lows of 54°F (12°C) and about 1.7 in (42 mm) of rain.
At 93/100 for comfort (4th of 12), it's one of the best months to visit.
- Avg high
- 71°F (22°C)
- Avg low
- 54°F (12°C)
- Rain
- 1.7 in (42 mm)
- Humidity
- 71%
- Cloud cover
- 51%
- Daylight
- ~11 h 48 min
- Comfort score
- 93/100 · Great
What September feels like
Highs settle around 71°F (22°C), warm enough for short sleeves most of the day.
Lows average 54°F (12°C).
About 1.7 in (42 mm) of rain falls in a typical year's September.
Plan around September
September is one of Knysna & Plettenberg Bay's best months on the climate data.
- First warm month: highs reach 71°F, up from 68°F in August.
- Inside the wettest three-month stretch, August – October.
- Last of the best-scoring months: by October, the score drops to 90/100.
- Comfort holds steady from August (92 → 93/100).
- Our Cape Town, Winelands & Garden Route recommends Oct – Apr, so September falls outside its suggested window.
What to pack for September
- Light, breathable clothes71°F afternoons
- Comfortable walking shoesmost places below are best reached on foot or with short walks
What to do in Knysna & Plettenberg Bay in September
September is good outdoor weather here, so these picks lean toward the open air.
Brenton-on-Sea
Long, wild beach west of the Knysna Heads, good for walks below vegetated dunes.
Why now September scores 93/100 for comfort, good conditions for being outside.
Featherbed Nature Reserve
Ferry across the lagoon to the western head, then a guided walk down through the private reserve.
Why now Highs near 71°F and 1.7 in of monthly rain make this an easy outdoor pick.
Knysna Heads
Twin sandstone cliffs at the narrow mouth of the Knysna Lagoon, with lookouts on the eastern head.
Why now One to do outside while the weather is on your side.
Thesen Islands
Former timber-mill island turned marina village with shops, galleries and cafes on the lagoon.
Robberg Nature Reserve
Rocky peninsula in Plettenberg Bay with hiking loops, seal colonies and whale views in season.
Nearby in September
- Stellenbosch & Franschhoek in September~240 mi · highs 64°F, 2.4 in rain · 4°C (6°F) cooler by day, wetter
- Cape Town in September~265 mi · highs 62°F, 1.6 in rain · 5°C (9°F) cooler by day, about as wet
NASA POWER 2001–2025 monthly averages on a ~50 km grid, temperatures adjusted from the grid cell's ~349 m to Knysna & Plettenberg Bay's ~11 m elevation (standard lapse rate). Comfort scores weigh temperature, rain, humidity and cloud: see how we score each month. Check a forecast before you go.
Knysna & Plettenberg Bay in September: quick answers
Is September a good time to visit Knysna & Plettenberg Bay?
Yes. On the climate data it's one of the best months, scoring 93/100. Expect highs of 71°F (22°C) and 1.7 in (42 mm) of rain. Our Cape Town, Winelands & Garden Route recommends Oct – Apr, so September is outside its suggested window.
How hot is Knysna & Plettenberg Bay in September?
Average highs are 71°F (22°C) and average lows 54°F (12°C), making it the 4th-coldest month by daytime highs.
Does it rain a lot in Knysna & Plettenberg Bay in September?
Not much: about 1.7 in (42 mm) of rain falls across September on average, the 6th-wettest month of the year. The annual total is about 20.8 in (529 mm).
What should I pack for Knysna & Plettenberg Bay in September?
Bring light, breathable clothes (71°F afternoons) and comfortable walking shoes (most places below are best reached on foot or with short walks).
More on Knysna & Plettenberg Bay
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