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September weather forecast in St.Lucia

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

	756 mmHg		67%
	7.3 m/s		+23

31 August, Sunday. day, 25°; night, 17°; partly cloudy

1 September, mon

	757 mmHg		66%
	6.8 m/s		+23

1 September, Monday. day, 25°; night, 16°; clear

2 September, tue

	757 mmHg		69%
	6.6 m/s		+23

2 September, Tuesday. day, 25°; night, 16°; clear

3 September, wed

	756 mmHg		68%
	7.3 m/s		+23

3 September, Wednesday. day, 25°; night, 17°; clear

4 September, thu

	757 mmHg		71%
	6.6 m/s		+23

4 September, Thursday. day, 25°; night, 17°; clear

5 September, fri

	756 mmHg		71%
	6.9 m/s		+23

5 September, Friday. day, 25°; night, 17°; clear

6 September, sat

	758 mmHg		73%
	6.6 m/s		+23

6 September, Saturday. day, 24°; night, 16°; rain

7 September, sun

	757 mmHg		73%
	6.3 m/s		+23

7 September, Sunday. day, 24°; night, 16°; clear

8 September, mon

	756 mmHg		73%
	6.8 m/s		+23

8 September, Monday. day, 26°; night, 17°; clear

9 September, tue

	755 mmHg		72%
	6.7 m/s		+23

9 September, Tuesday. day, 25°; night, 17°; clear

10 September, wed

	756 mmHg		72%
	6.8 m/s		+23

10 September, Wednesday. day, 25°; night, 17°; clear

11 September, thu

	757 mmHg		73%
	6.6 m/s		+23

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

12 September, fri

	757 mmHg		70%
	7 m/s		+23

12 September, Friday. day, 25°; night, 17°; clear

13 September, sat

	757 mmHg		71%
	7 m/s		+23

13 September, Saturday. day, 25°; night, 17°; partly cloudy

14 September, sun

	758 mmHg		71%
	6.5 m/s		+23

14 September, Sunday. day, 24°; night, 17°; rain

15 September, mon

	756 mmHg		68%
	6.6 m/s		+23

15 September, Monday. day, 26°; night, 17°; clear

16 September, tue

	756 mmHg		73%
	7.1 m/s		+23

16 September, Tuesday. day, 25°; night, 18°; partly cloudy

17 September, wed

	756 mmHg		74%
	6.9 m/s		+23

17 September, Wednesday. day, 24°; night, 17°; rain

18 September, thu

	756 mmHg		72%
	7.1 m/s		+23

18 September, Thursday. day, 24°; night, 17°; clear

19 September, fri

	757 mmHg		71%
	7 m/s		+23

19 September, Friday. day, 24°; night, 16°; partly cloudy

20 September, sat

	757 mmHg		73%
	7.1 m/s		+23

20 September, Saturday. day, 24°; night, 17°; rain

21 September, sun

	757 mmHg		72%
	6.9 m/s		+23

21 September, Sunday. day, 24°; night, 17°; rain

22 September, mon

	757 mmHg		72%
	5.9 m/s		+23

22 September, Monday. day, 24°; night, 17°; partly cloudy

23 September, tue

	756 mmHg		72%
	6.9 m/s		+23

23 September, Tuesday. day, 25°; night, 17°; clear

24 September, wed

	755 mmHg		72%
	7.1 m/s		+23

24 September, Wednesday. day, 26°; night, 18°; clear

25 September, thu

	755 mmHg		72%
	7 m/s		+23

25 September, Thursday. day, 26°; night, 18°; overcast

26 September, fri

	754 mmHg		71%
	7.2 m/s		+23

26 September, Friday. day, 26°; night, 18°; clear

27 September, sat

	755 mmHg		71%
	7.3 m/s		+23

27 September, Saturday. day, 26°; night, 18°; overcast

28 September, sun

	757 mmHg		73%
	7 m/s		+23

28 September, Sunday. day, 24°; night, 17°; rain

29 September, mon

	757 mmHg		73%
	6.7 m/s		+23

29 September, Monday. day, 24°; night, 17°; rain

30 September, tue

	756 mmHg		72%
	6.6 m/s		+23

30 September, Tuesday. day, 25°; night, 17°; partly cloudy

1 October, wed

	755 mmHg		73%
	7.2 m/s		+23

1 October, Wednesday. day, 25°; night, 17°; clear

2 October, thu

	756 mmHg		73%
	6.6 m/s		+23

2 October, Thursday. day, 24°; night, 17°; partly cloudy

3 October, fri

	756 mmHg		74%
	6.8 m/s		+23

3 October, Friday. day, 25°; night, 17°; clear

4 October, sat

	756 mmHg		73%
	6.4 m/s		+23

4 October, Saturday. day, 25°; night, 18°; clear

Average data for 10 years

St.Lucia September

15

sunny days

8

days with precipitation

4

cloudy days

15 sunny days; 8 days with precipitation; 4 cloudy days;

72

%

air humidity

4.8

m/s

WindSE

49

mm of precipitation

(6% of annual average)

+23

°C

Water temperature

air humidity 72%; 49 millimeters of precipitation (6% of annual average); Wind south-easterly 4.8 Meters per second; Water temperature +23°

Weather graphs for September

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

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SE

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1

Average data for 10 years

2

3

4

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11

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16

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20

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30

Daytime temperature

Night-time temperature

Cities near you

Johannesburg
Pretoria
Durban
Inhambane
Mbabane
Maputo
Nigel
Ladysmith
Mbombela

Cities with similar weather in September

San Francisco
The Golden Sands
Genoa
Seattle
Lima
Brisbane
San Remo
San Sebastian
San Jose

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

September in St.Lucia is the windiest month of the year. In September, the weather in St.Lucia is typically warm. Average daily high temperature in September is about 25 degrees above zero. On average, St.Lucia has 15 sunny, 8 rainy, 5 partly cloudy, and 2 cloudy days in September. The rains are usually moderate.

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