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September weather forecast in Hermanus

30 days Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

30 days Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Sun

Sunday

Mon

Monday

Tue

Tuesday

Wed

Wednesday

Thu

Thursday

Fri

Friday

Sat

Saturday

31 August, sun

	745 mmHg		78%
	6.9 m/s		+15

31 August, Sunday. day, 15°; night, 10°; rain

1 September, mon

	746 mmHg		77%
	6.6 m/s		+15

1 September, Monday. day, 15°; night, 11°; partly cloudy

2 September, tue

	745 mmHg		78%
	6.5 m/s		+16

2 September, Tuesday. day, 16°; night, 10°; rain

3 September, wed

	746 mmHg		78%
	6.2 m/s		+16

3 September, Wednesday. day, 15°; night, 11°; rain

4 September, thu

	745 mmHg		76%
	6.2 m/s		+16

4 September, Thursday. day, 16°; night, 10°; partly cloudy

5 September, fri

	747 mmHg		79%
	6.3 m/s		+16

5 September, Friday. day, 15°; night, 10°; rain

6 September, sat

	747 mmHg		76%
	5.3 m/s		+16

6 September, Saturday. day, 16°; night, 10°; partly cloudy

7 September, sun

	745 mmHg		78%
	5.3 m/s		+16

7 September, Sunday. day, 16°; night, 10°; partly cloudy

8 September, mon

	745 mmHg		80%
	5.9 m/s		+15

8 September, Monday. day, 16°; night, 11°; clear

9 September, tue

	745 mmHg		79%
	6.1 m/s		+15

9 September, Tuesday. day, 15°; night, 11°; partly cloudy

10 September, wed

	747 mmHg		77%
	6.2 m/s		+16

10 September, Wednesday. day, 15°; night, 10°; clear

11 September, thu

	746 mmHg		77%
	5.5 m/s		+16

11 September, Thursday. day, 16°; night, 10°; partly cloudy

12 September, fri

	746 mmHg		77%
	5.4 m/s		+17

12 September, Friday. day, 16°; night, 11°; clear

13 September, sat

	746 mmHg		76%
	6 m/s		+17

13 September, Saturday. day, 17°; night, 11°; clear

14 September, sun

	745 mmHg		78%
	5.9 m/s		+15

14 September, Sunday. day, 17°; night, 11°; clear

15 September, mon

	745 mmHg		79%
	6.1 m/s		+15

15 September, Monday. day, 16°; night, 11°; rain

16 September, tue

	745 mmHg		79%
	6.1 m/s		+15

16 September, Tuesday. day, 16°; night, 11°; overcast

17 September, wed

	746 mmHg		78%
	5.6 m/s		+16

17 September, Wednesday. day, 15°; night, 11°; rain

18 September, thu

	746 mmHg		78%
	6.4 m/s		+16

18 September, Thursday. day, 16°; night, 11°; rain

19 September, fri

	747 mmHg		76%
	5.5 m/s		+16

19 September, Friday. day, 16°; night, 11°; clear

20 September, sat

	746 mmHg		76%
	5.6 m/s		+16

20 September, Saturday. day, 16°; night, 11°; clear

21 September, sun

	746 mmHg		77%
	5.5 m/s		+16

21 September, Sunday. day, 17°; night, 11°; partly cloudy

22 September, mon

	745 mmHg		77%
	5.6 m/s		+16

22 September, Monday. day, 17°; night, 11°; clear

23 September, tue

	745 mmHg		78%
	5.9 m/s		+16

23 September, Tuesday. day, 16°; night, 11°; partly cloudy

24 September, wed

	744 mmHg		79%
	6.3 m/s		+16

24 September, Wednesday. day, 16°; night, 11°; rain

25 September, thu

	744 mmHg		78%
	6.5 m/s		+15

25 September, Thursday. day, 16°; night, 11°; rain

26 September, fri

	745 mmHg		77%
	6.2 m/s		+16

26 September, Friday. day, 16°; night, 11°; rain

27 September, sat

	746 mmHg		76%
	5.8 m/s		+16

27 September, Saturday. day, 16°; night, 11°; rain

28 September, sun

	746 mmHg		75%
	5.6 m/s		+16

28 September, Sunday. day, 17°; night, 11°; clear

29 September, mon

	746 mmHg		76%
	5.7 m/s		+16

29 September, Monday. day, 17°; night, 11°; clear

30 September, tue

	745 mmHg		78%
	6.3 m/s		+16

30 September, Tuesday. day, 17°; night, 11°; partly cloudy

1 October, wed

	746 mmHg		77%
	6.1 m/s		+16

1 October, Wednesday. day, 17°; night, 12°; overcast

2 October, thu

	745 mmHg		78%
	5.7 m/s		+17

2 October, Thursday. day, 17°; night, 12°; rain

3 October, fri

	745 mmHg		77%
	5.7 m/s		+17

3 October, Friday. day, 17°; night, 12°; rain

4 October, sat

	745 mmHg		75%
	5.3 m/s		+17

4 October, Saturday. day, 17°; night, 12°; partly cloudy

Average data for 10 years

Hermanus September

10

sunny days

10

days with precipitation

4

cloudy days

10 sunny days; 10 days with precipitation; 4 cloudy days;

78

%

air humidity

4.19

m/s

WindSW

62

mm of precipitation

(9% of annual average)

+16

°C

Water temperature

air humidity 78%; 62 millimeters of precipitation (9% of annual average); Wind south-westerly 4.19 Meters per second; Water temperature +16°

Weather graphs for September

TemperatureWater temperaturePrecipitation chance, %Humidity, %Wind, m/sPressure, mmHg

SW

SW

SW

SW

SW

S

S

SW

SW

S

S

S

S

S

SW

SW

S

SW

S

S

S

S

SW

SW

SW

SW

SW

S

S

S

1

Average data for 10 years

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

Daytime temperature

Night-time temperature

Cities near you

Capetown
Port Elizabeth
Addo
Tulbagh
Upington
Stellenbosch
Mossel Bay
Plettenberg Bay
Franschhoek

Cities with similar weather in September

Helsinki
Riga
Tallinn
Stockholm
Oslo
Yurmala
Palanga
Dublin
Buenos Aires

The weather forecast for September 2025 is based on historical data from the past 10 years.

September in Hermanus is the cloudiest month of the year. In September, the weather in Hermanus is typically warm. Average daily high temperature in September is about 16 degrees above zero. On average, Hermanus has 10 rainy, 10 sunny, 9 partly cloudy, and 1 cloudy day in September. The rains are usually moderate. September as well as June, July, and August is considered the most uncomfortable time to visit Hermanus.

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