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September weather forecast in San Antonio

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

	764 mmHg		85%
	7.1 m/s		+13

31 August, Sunday. day, 12°; night, 10°; partly cloudy

1 September, mon

	764 mmHg		85%
	7.8 m/s		+13

1 September, Monday. day, 12°; night, 10°; clear

2 September, tue

	764 mmHg		85%
	7 m/s		+13

2 September, Tuesday. day, 12°; night, 10°; overcast

3 September, wed

	764 mmHg		86%
	6.7 m/s		+13

3 September, Wednesday. day, 12°; night, 10°; partly cloudy

4 September, thu

	764 mmHg		87%
	7.1 m/s		+13

4 September, Thursday. day, 12°; night, 10°; partly cloudy

5 September, fri

	764 mmHg		87%
	7 m/s		+13

5 September, Friday. day, 12°; night, 10°; rain

6 September, sat

	764 mmHg		87%
	6.9 m/s		+13

6 September, Saturday. day, 12°; night, 11°; rain

7 September, sun

	764 mmHg		85%
	7.7 m/s		+13

7 September, Sunday. day, 12°; night, 10°; rain

8 September, mon

	765 mmHg		82%
	7.7 m/s		+13

8 September, Monday. day, 12°; night, 10°; partly cloudy

9 September, tue

	764 mmHg		83%
	7.7 m/s		+13

9 September, Tuesday. day, 12°; night, 10°; partly cloudy

10 September, wed

	764 mmHg		85%
	7.6 m/s		+13

10 September, Wednesday. day, 12°; night, 10°; clear

11 September, thu

	765 mmHg		86%
	7.7 m/s		+13

11 September, Thursday. day, 12°; night, 10°; clear

12 September, fri

	764 mmHg		85%
	8.1 m/s		+13

12 September, Friday. day, 12°; night, 10°; clear

13 September, sat

	764 mmHg		84%
	7.4 m/s		+13

13 September, Saturday. day, 12°; night, 10°; clear

14 September, sun

	765 mmHg		85%
	7.1 m/s		+13

14 September, Sunday. day, 13°; night, 10°; clear

15 September, mon

	764 mmHg		85%
	7.1 m/s		+13

15 September, Monday. day, 13°; night, 10°; clear

16 September, tue

	763 mmHg		87%
	6.9 m/s		+13

16 September, Tuesday. day, 13°; night, 11°; clear

17 September, wed

	764 mmHg		86%
	7 m/s		+13

17 September, Wednesday. day, 12°; night, 10°; overcast

18 September, thu

	764 mmHg		86%
	7.8 m/s		+13

18 September, Thursday. day, 12°; night, 11°; partly cloudy

19 September, fri

	764 mmHg		85%
	8.5 m/s		+13

19 September, Friday. day, 13°; night, 10°; clear

20 September, sat

	764 mmHg		86%
	7.8 m/s		+13

20 September, Saturday. day, 12°; night, 11°; clear

21 September, sun

	764 mmHg		87%
	7.5 m/s		+13

21 September, Sunday. day, 12°; night, 11°; clear

22 September, mon

	764 mmHg		86%
	7.6 m/s		+13

22 September, Monday. day, 13°; night, 11°; partly cloudy

23 September, tue

	764 mmHg		86%
	7.6 m/s		+13

23 September, Tuesday. day, 13°; night, 11°; clear

24 September, wed

	763 mmHg		86%
	7.5 m/s		+13

24 September, Wednesday. day, 13°; night, 11°; clear

25 September, thu

	764 mmHg		87%
	6.9 m/s		+13

25 September, Thursday. day, 12°; night, 11°; partly cloudy

26 September, fri

	764 mmHg		86%
	7.2 m/s		+13

26 September, Friday. day, 12°; night, 10°; partly cloudy

27 September, sat

	764 mmHg		85%
	7.3 m/s		+13

27 September, Saturday. day, 12°; night, 11°; partly cloudy

28 September, sun

	764 mmHg		87%
	6.9 m/s		+13

28 September, Sunday. day, 12°; night, 11°; clear

29 September, mon

	763 mmHg		88%
	7 m/s		+13

29 September, Monday. day, 12°; night, 11°; partly cloudy

30 September, tue

	763 mmHg		87%
	6.9 m/s		+13

30 September, Tuesday. day, 12°; night, 11°; overcast

1 October, wed

	764 mmHg		85%
	7.8 m/s		+13

1 October, Wednesday. day, 12°; night, 11°; overcast

2 October, thu

	763 mmHg		85%
	7.7 m/s		+13

2 October, Thursday. day, 12°; night, 11°; overcast

3 October, fri

	763 mmHg		86%
	7.2 m/s		+13

3 October, Friday. day, 12°; night, 11°; overcast

4 October, sat

	764 mmHg		84%
	7.5 m/s		+13

4 October, Saturday. day, 13°; night, 11°; rain

Average data for 10 years

San Antonio September

14

sunny days

3

days with precipitation

5

cloudy days

14 sunny days; 3 days with precipitation; 5 cloudy days;

86

%

air humidity

5

m/s

WindSW

31

mm of precipitation

(8% of annual average)

+13

°C

Water temperature

air humidity 86%; 31 millimeters of precipitation (8% of annual average); Wind south-westerly 5 Meters per second; Water temperature +13°

Weather graphs for September

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

SW

S

SW

S

SW

SW

SW

S

S

SW

S

SW

SW

SW

SW

SW

SW

SW

S

SW

SW

SW

SW

SW

SW

SW

SW

SW

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

Santiago
Mendoza
Valparaiso
Vina del Mar
Rancagua
Concepcion
La Serena
Concon
San Rafael

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.

In September, the weather in San Antonio is typically warm. Average daily high temperature in September is about 12 degrees above zero. On average, San Antonio has 14 sunny, 10 partly cloudy, 3 rainy, and 3 cloudy days in September. The rains are usually moderate.

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