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September weather forecast in San Jose

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

	751 mmHg		81%
	6.1 m/s		+30

31 August, Sunday. day, 28°; night, 26°; rain

1 September, mon

	751 mmHg		81%
	6.5 m/s		+30

1 September, Monday. day, 28°; night, 26°; rain

2 September, tue

	751 mmHg		81%
	6.1 m/s		+30

2 September, Tuesday. day, 28°; night, 27°; rain

3 September, wed

	751 mmHg		80%
	5.8 m/s		+30

3 September, Wednesday. day, 28°; night, 27°; partly cloudy

4 September, thu

	751 mmHg		81%
	5.8 m/s		+30

4 September, Thursday. day, 28°; night, 26°; partly cloudy

5 September, fri

	751 mmHg		81%
	5.8 m/s		+30

5 September, Friday. day, 28°; night, 27°; overcast

6 September, sat

	751 mmHg		81%
	5.8 m/s		+30

6 September, Saturday. day, 28°; night, 26°; rain

7 September, sun

	751 mmHg		82%
	5.6 m/s		+30

7 September, Sunday. day, 28°; night, 26°; rain

8 September, mon

	751 mmHg		81%
	5.6 m/s		+30

8 September, Monday. day, 28°; night, 26°; rain

9 September, tue

	751 mmHg		81%
	5.8 m/s		+30

9 September, Tuesday. day, 28°; night, 26°; rain

10 September, wed

	751 mmHg		81%
	6.4 m/s		+30

10 September, Wednesday. day, 28°; night, 26°; rain

11 September, thu

	751 mmHg		81%
	6.6 m/s		+30

11 September, Thursday. day, 28°; night, 26°; rain

12 September, fri

	751 mmHg		81%
	6.9 m/s		+30

12 September, Friday. day, 28°; night, 26°; rain

13 September, sat

	751 mmHg		81%
	7.2 m/s		+30

13 September, Saturday. day, 28°; night, 26°; overcast

14 September, sun

	751 mmHg		81%
	7.2 m/s		+30

14 September, Sunday. day, 28°; night, 26°; rain

15 September, mon

	751 mmHg		81%
	6.5 m/s		+30

15 September, Monday. day, 28°; night, 26°; overcast

16 September, tue

	751 mmHg		80%
	6.2 m/s		+30

16 September, Tuesday. day, 28°; night, 27°; overcast

17 September, wed

	751 mmHg		81%
	6.3 m/s		+30

17 September, Wednesday. day, 28°; night, 27°; partly cloudy

18 September, thu

	751 mmHg		81%
	6.3 m/s		+30

18 September, Thursday. day, 28°; night, 26°; rain

19 September, fri

	751 mmHg		81%
	6.2 m/s		+30

19 September, Friday. day, 28°; night, 26°; rain

20 September, sat

	751 mmHg		81%
	6.2 m/s		+30

20 September, Saturday. day, 28°; night, 26°; rain

21 September, sun

	751 mmHg		82%
	6.2 m/s		+30

21 September, Sunday. day, 28°; night, 26°; rain

22 September, mon

	751 mmHg		82%
	6.5 m/s		+30

22 September, Monday. day, 28°; night, 26°; rain

23 September, tue

	751 mmHg		81%
	5.9 m/s		+30

23 September, Tuesday. day, 28°; night, 26°; rain

24 September, wed

	751 mmHg		82%
	6.1 m/s		+30

24 September, Wednesday. day, 28°; night, 26°; rain

25 September, thu

	751 mmHg		82%
	6.4 m/s		+30

25 September, Thursday. day, 28°; night, 26°; rain

26 September, fri

	751 mmHg		82%
	6.6 m/s		+30

26 September, Friday. day, 28°; night, 26°; rain

27 September, sat

	751 mmHg		82%
	6.2 m/s		+30

27 September, Saturday. day, 28°; night, 26°; rain

28 September, sun

	751 mmHg		81%
	5.6 m/s		+30

28 September, Sunday. day, 28°; night, 26°; overcast

29 September, mon

	751 mmHg		82%
	5.7 m/s		+30

29 September, Monday. day, 28°; night, 26°; rain

30 September, tue

	751 mmHg		82%
	5.8 m/s		+30

30 September, Tuesday. day, 28°; night, 26°; rain

1 October, wed

	751 mmHg		82%
	6.3 m/s		+30

1 October, Wednesday. day, 28°; night, 26°; rain

2 October, thu

	751 mmHg		82%
	6.2 m/s		+30

2 October, Thursday. day, 28°; night, 26°; overcast

3 October, fri

	751 mmHg		83%
	6.2 m/s		+30

3 October, Friday. day, 28°; night, 26°; rain

4 October, sat

	751 mmHg		83%
	6.1 m/s		+30

4 October, Saturday. day, 28°; night, 26°; rain

Average data for 10 years

San Jose September

0

sunny days

22

days with precipitation

20

cloudy days

0 sunny days; 22 days with precipitation; 20 cloudy days;

81

%

air humidity

4.6

m/s

WindS

147

mm of precipitation

(6% of annual average)

+30

°C

Water temperature

air humidity 81%; 147 millimeters of precipitation (6% of annual average); Wind southerly 4.6 Meters per second; Water temperature +30°

Weather graphs for September

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

SW

S

S

S

SW

S

S

S

SW

SW

SW

SW

SW

SW

SW

S

S

S

S

S

SW

S

S

S

SW

S

S

S

SW

SW

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

Cebu
Panglao
Davao
Alabel
Virac
Surigao
Dauin
Dumaguete
General Santos

Cities with similar weather in September

Phuket
Ayia Napa
Santo Domingo
Protaras
Varadero
Male
Phan Thiet
Samui
Krabi

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

In September, the weather in San Jose is typically hot. Average daily high temperature in September is about 28 degrees above zero. On average, San Jose has 22 rainy, 5 cloudy, and 3 partly cloudy days in September. The rains are usually heavy. September as well as January, February, March, and April is considered the most uncomfortable time to visit San Jose.

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