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September weather forecast in Rio Grande

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		75%
	6.9 m/s		+19

31 August, Sunday. day, 18°; night, 15°; clear

1 September, mon

	765 mmHg		79%
	6.5 m/s		+19

1 September, Monday. day, 18°; night, 16°; partly cloudy

2 September, tue

	764 mmHg		76%
	8.3 m/s		+20

2 September, Tuesday. day, 19°; night, 16°; partly cloudy

3 September, wed

	765 mmHg		75%
	8.8 m/s		+17

3 September, Wednesday. day, 17°; night, 14°; rain

4 September, thu

	767 mmHg		75%
	9.1 m/s		+17

4 September, Thursday. day, 16°; night, 14°; overcast

5 September, fri

	766 mmHg		75%
	6.1 m/s		+18

5 September, Friday. day, 17°; night, 15°; rain

6 September, sat

	763 mmHg		76%
	7.4 m/s		+19

6 September, Saturday. day, 18°; night, 16°; partly cloudy

7 September, sun

	762 mmHg		75%
	8.6 m/s		+20

7 September, Sunday. day, 18°; night, 16°; partly cloudy

8 September, mon

	764 mmHg		75%
	7.5 m/s		+21

8 September, Monday. day, 19°; night, 16°; partly cloudy

9 September, tue

	764 mmHg		75%
	8.6 m/s		+20

9 September, Tuesday. day, 19°; night, 16°; rain

10 September, wed

	765 mmHg		68%
	7.8 m/s		+20

10 September, Wednesday. day, 19°; night, 15°; partly cloudy

11 September, thu

	765 mmHg		70%
	6.9 m/s		+19

11 September, Thursday. day, 18°; night, 17°; rain

12 September, fri

	763 mmHg		76%
	7.3 m/s		+19

12 September, Friday. day, 18°; night, 15°; clear

13 September, sat

	763 mmHg		74%
	8.3 m/s		+19

13 September, Saturday. day, 18°; night, 15°; partly cloudy

14 September, sun

	763 mmHg		75%
	9.3 m/s		+18

14 September, Sunday. day, 18°; night, 16°; partly cloudy

15 September, mon

	764 mmHg		81%
	7 m/s		+18

15 September, Monday. day, 17°; night, 15°; overcast

16 September, tue

	765 mmHg		76%
	7.8 m/s		+18

16 September, Tuesday. day, 17°; night, 15°; overcast

17 September, wed

	764 mmHg		77%
	7.6 m/s		+19

17 September, Wednesday. day, 18°; night, 15°; partly cloudy

18 September, thu

	765 mmHg		76%
	7.3 m/s		+19

18 September, Thursday. day, 17°; night, 15°; clear

19 September, fri

	762 mmHg		76%
	9.3 m/s		+19

19 September, Friday. day, 18°; night, 15°; partly cloudy

20 September, sat

	762 mmHg		73%
	7.1 m/s		+20

20 September, Saturday. day, 18°; night, 16°; clear

21 September, sun

	763 mmHg		75%
	7.5 m/s		+19

21 September, Sunday. day, 18°; night, 15°; rain

22 September, mon

	764 mmHg		79%
	8.3 m/s		+19

22 September, Monday. day, 18°; night, 15°; clear

23 September, tue

	766 mmHg		73%
	7 m/s		+18

23 September, Tuesday. day, 16°; night, 14°; partly cloudy

24 September, wed

	766 mmHg		73%
	8.5 m/s		+20

24 September, Wednesday. day, 18°; night, 15°; rain

25 September, thu

	765 mmHg		75%
	7 m/s		+20

25 September, Thursday. day, 18°; night, 15°; clear

26 September, fri

	765 mmHg		79%
	8.3 m/s		+18

26 September, Friday. day, 17°; night, 14°; clear

27 September, sat

	765 mmHg		74%
	9.1 m/s		+19

27 September, Saturday. day, 18°; night, 15°; clear

28 September, sun

	764 mmHg		74%
	8 m/s		+21

28 September, Sunday. day, 20°; night, 16°; rain

29 September, mon

	764 mmHg		75%
	7 m/s		+18

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

30 September, tue

	763 mmHg		74%
	7.1 m/s		+20

30 September, Tuesday. day, 18°; night, 15°; rain

1 October, wed

	762 mmHg		76%
	8.1 m/s		+20

1 October, Wednesday. day, 19°; night, 16°; partly cloudy

2 October, thu

	765 mmHg		70%
	7.8 m/s		+19

2 October, Thursday. day, 17°; night, 15°; partly cloudy

3 October, fri

	765 mmHg		73%
	7.5 m/s		+20

3 October, Friday. day, 19°; night, 17°; partly cloudy

4 October, sat

	763 mmHg		75%
	8.5 m/s		+20

4 October, Saturday. day, 19°; night, 17°; overcast

Average data for 10 years

Rio Grande September

8

sunny days

8

days with precipitation

14

cloudy days

8 sunny days; 8 days with precipitation; 14 cloudy days;

75

%

air humidity

6

m/s

WindE

135

mm of precipitation

(13% of annual average)

+19

°C

Water temperature

air humidity 75%; 135 millimeters of precipitation (13% of annual average); Wind easterly 6 Meters per second; Water temperature +19°

Weather graphs for September

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

E

E

SE

SE

E

NE

W

NE

E

S

E

SE

W

NW

E

SE

E

E

W

SW

S

SE

SE

E

SE

SE

E

NE

E

E

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

Chuy
Porto Alegre
Rocha
Tacuarembo
Santana do Livramento

Cities with similar weather in September

Sydney
Palanga
Buenos Aires
Copenhagen
Capetown
Gdansk
Looe
Klaipeda
Bruges

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

September in Rio Grande is the cloudiest month of the year. In September, the weather in Rio Grande is typically warm. Average daily high temperature in September is about 18 degrees above zero. On average, Rio Grande has 11 partly cloudy, 8 rainy, 8 sunny, and 3 cloudy days in September. The rains are usually heavy. September as well as February and August is considered the most uncomfortable time to visit Rio Grande.

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