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September weather forecast in San Juan

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

	761 mmHg		81%
	5.4 m/s		+29

31 August, Sunday. day, 30°; night, 26°; rain

1 September, mon

	761 mmHg		82%
	4.8 m/s		+29

1 September, Monday. day, 30°; night, 26°; rain

2 September, tue

	760 mmHg		82%
	4.6 m/s		+29

2 September, Tuesday. day, 30°; night, 26°; rain

3 September, wed

	760 mmHg		82%
	4.9 m/s		+29

3 September, Wednesday. day, 30°; night, 26°; rain

4 September, thu

	760 mmHg		82%
	4.69 m/s		+29

4 September, Thursday. day, 30°; night, 26°; clear

5 September, fri

	761 mmHg		82%
	4.69 m/s		+29

5 September, Friday. day, 30°; night, 26°; rain

6 September, sat

	760 mmHg		82%
	5.2 m/s		+29

6 September, Saturday. day, 30°; night, 26°; rain

7 September, sun

	760 mmHg		82%
	5.3 m/s		+29

7 September, Sunday. day, 30°; night, 26°; rain

8 September, mon

	760 mmHg		82%
	4.9 m/s		+29

8 September, Monday. day, 30°; night, 26°; rain

9 September, tue

	760 mmHg		81%
	4.8 m/s		+29

9 September, Tuesday. day, 30°; night, 26°; clear

10 September, wed

	760 mmHg		81%
	4.9 m/s		+29

10 September, Wednesday. day, 30°; night, 26°; clear

11 September, thu

	760 mmHg		82%
	4.8 m/s		+29

11 September, Thursday. day, 30°; night, 26°; rain

12 September, fri

	760 mmHg		81%
	4.69 m/s		+29

12 September, Friday. day, 30°; night, 26°; rain

13 September, sat

	760 mmHg		81%
	4.69 m/s		+29

13 September, Saturday. day, 30°; night, 26°; partly cloudy

14 September, sun

	760 mmHg		82%
	4.8 m/s		+29

14 September, Sunday. day, 30°; night, 26°; rain

15 September, mon

	760 mmHg		82%
	5.1 m/s		+29

15 September, Monday. day, 30°; night, 26°; rain

16 September, tue

	760 mmHg		82%
	5.1 m/s		+29

16 September, Tuesday. day, 30°; night, 26°; partly cloudy

17 September, wed

	760 mmHg		82%
	4.8 m/s		+29

17 September, Wednesday. day, 30°; night, 26°; rain

18 September, thu

	760 mmHg		82%
	4.69 m/s		+29

18 September, Thursday. day, 30°; night, 26°; rain

19 September, fri

	760 mmHg		83%
	4.6 m/s		+29

19 September, Friday. day, 30°; night, 25°; rain

20 September, sat

	759 mmHg		83%
	4.9 m/s		+29

20 September, Saturday. day, 29°; night, 25°; rain

21 September, sun

	760 mmHg		83%
	4.8 m/s		+29

21 September, Sunday. day, 29°; night, 25°; rain

22 September, mon

	760 mmHg		82%
	4.9 m/s		+29

22 September, Monday. day, 30°; night, 25°; rain

23 September, tue

	760 mmHg		82%
	4.6 m/s		+29

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

24 September, wed

	760 mmHg		82%
	4.5 m/s		+29

24 September, Wednesday. day, 30°; night, 26°; rain

25 September, thu

	760 mmHg		82%
	4.5 m/s		+29

25 September, Thursday. day, 30°; night, 26°; rain

26 September, fri

	760 mmHg		82%
	4.4 m/s		+29

26 September, Friday. day, 30°; night, 26°; partly cloudy

27 September, sat

	760 mmHg		83%
	4.3 m/s		+29

27 September, Saturday. day, 29°; night, 25°; rain

28 September, sun

	760 mmHg		82%
	4.4 m/s		+29

28 September, Sunday. day, 30°; night, 25°; rain

29 September, mon

	760 mmHg		82%
	4.5 m/s		+29

29 September, Monday. day, 30°; night, 25°; rain

30 September, tue

	760 mmHg		82%
	4.4 m/s		+29

30 September, Tuesday. day, 30°; night, 25°; rain

1 October, wed

	760 mmHg		82%
	4.6 m/s		+29

1 October, Wednesday. day, 30°; night, 25°; rain

2 October, thu

	760 mmHg		82%
	4.69 m/s		+29

2 October, Thursday. day, 30°; night, 25°; rain

3 October, fri

	760 mmHg		82%
	4.6 m/s		+29

3 October, Friday. day, 30°; night, 25°; rain

4 October, sat

	760 mmHg		82%
	4.69 m/s		+29

4 October, Saturday. day, 29°; night, 26°; rain

Average data for 10 years

San Juan September

3

sunny days

23

days with precipitation

8

cloudy days

3 sunny days; 23 days with precipitation; 8 cloudy days;

82

%

air humidity

3.3

m/s

WindE

142

mm of precipitation

(14% of annual average)

+29

°C

Water temperature

air humidity 82%; 142 millimeters of precipitation (14% of annual average); Wind easterly 3.3 Meters per second; Water temperature +29°

Weather graphs for September

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

E

E

E

SE

SE

SE

SE

SE

E

SE

E

SE

E

E

E

E

E

E

SE

SE

SE

SE

SE

E

E

E

E

E

E

SE

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

Punta Cana
Santo Domingo
Boca Chica
Charlotte Amalie
The Valley
Samana
La Romana
Rio Grande
Road Town

Cities with similar weather in September

Pattaya
Nha Trang
Bangkok
Santo Domingo
Varadero
Havana
Ko Chang
Mumbai
Kinshasa

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

September in San Juan is the rainiest and the cloudiest month of the year. In September, the weather in San Juan is typically hot. Average daily high temperature in September is about 30 degrees above zero. On average, San Juan has 23 rainy, 4 partly cloudy, and 3 sunny days in September. The rains are usually heavy. September as well as May, June, July, and August is considered the most uncomfortable time to visit San Juan.

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