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August weather forecast in Sarnia

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

27 July, sun

	744 mmHg		74%
	4.69 m/s		+21

27 July, Sunday. day, 26°; night, 19°; rain

28 July, mon

	744 mmHg		74%
	5.2 m/s		+21

28 July, Monday. day, 26°; night, 19°; rain

29 July, tue

	744 mmHg		73%
	4.8 m/s		+21

29 July, Tuesday. day, 26°; night, 19°; rain

30 July, wed

	745 mmHg		74%
	4.1 m/s		+22

30 July, Wednesday. day, 25°; night, 19°; clear

31 July, thu

	745 mmHg		73%
	4.1 m/s		+22

31 July, Thursday. day, 27°; night, 19°; clear

1 August, fri

	745 mmHg		74%
	4.1 m/s		+22

1 August, Friday. day, 27°; night, 19°; clear

2 August, sat

	745 mmHg		73%
	4.5 m/s		+22

2 August, Saturday. day, 27°; night, 20°; clear

3 August, sun

	745 mmHg		75%
	4.3 m/s		+22

3 August, Sunday. day, 27°; night, 19°; rain

4 August, mon

	745 mmHg		76%
	4.5 m/s		+22

4 August, Monday. day, 26°; night, 19°; rain

5 August, tue

	745 mmHg		74%
	4.6 m/s		+22

5 August, Tuesday. day, 25°; night, 19°; rain

6 August, wed

	745 mmHg		74%
	4.6 m/s		+22

6 August, Wednesday. day, 25°; night, 18°; partly cloudy

7 August, thu

	745 mmHg		76%
	4.4 m/s		+22

7 August, Thursday. day, 26°; night, 18°; rain

8 August, fri

	745 mmHg		76%
	4.9 m/s		+22

8 August, Friday. day, 26°; night, 19°; rain

9 August, sat

	745 mmHg		74%
	4.8 m/s		+22

9 August, Saturday. day, 26°; night, 19°; clear

10 August, sun

	744 mmHg		75%
	4.6 m/s		+21

10 August, Sunday. day, 25°; night, 19°; rain

11 August, mon

	744 mmHg		76%
	4.8 m/s		+21

11 August, Monday. day, 25°; night, 18°; rain

12 August, tue

	745 mmHg		76%
	4.4 m/s		+21

12 August, Tuesday. day, 25°; night, 18°; rain

13 August, wed

	745 mmHg		75%
	4.3 m/s		+21

13 August, Wednesday. day, 25°; night, 18°; partly cloudy

14 August, thu

	745 mmHg		75%
	4.6 m/s		+22

14 August, Thursday. day, 25°; night, 18°; overcast

15 August, fri

	745 mmHg		74%
	4.4 m/s		+22

15 August, Friday. day, 25°; night, 18°; clear

16 August, sat

	746 mmHg		74%
	4.9 m/s		+22

16 August, Saturday. day, 26°; night, 18°; clear

17 August, sun

	745 mmHg		76%
	4.8 m/s		+22

17 August, Sunday. day, 25°; night, 18°; partly cloudy

18 August, mon

	745 mmHg		74%
	4.69 m/s		+22

18 August, Monday. day, 25°; night, 18°; rain

19 August, tue

	745 mmHg		74%
	4.5 m/s		+22

19 August, Tuesday. day, 24°; night, 17°; clear

20 August, wed

	745 mmHg		76%
	4.9 m/s		+22

20 August, Wednesday. day, 24°; night, 17°; rain

21 August, thu

	745 mmHg		76%
	4.9 m/s		+21

21 August, Thursday. day, 25°; night, 17°; clear

22 August, fri

	746 mmHg		76%
	4.8 m/s		+21

22 August, Friday. day, 24°; night, 17°; clear

23 August, sat

	746 mmHg		77%
	4.6 m/s		+21

23 August, Saturday. day, 24°; night, 17°; partly cloudy

24 August, sun

	746 mmHg		76%
	4.6 m/s		+21

24 August, Sunday. day, 25°; night, 17°; clear

25 August, mon

	746 mmHg		77%
	4.69 m/s		+21

25 August, Monday. day, 25°; night, 18°; overcast

26 August, tue

	746 mmHg		77%
	4.4 m/s		+21

26 August, Tuesday. day, 25°; night, 18°; overcast

27 August, wed

	745 mmHg		79%
	4.6 m/s		+21

27 August, Wednesday. day, 25°; night, 18°; rain

28 August, thu

	745 mmHg		78%
	4.9 m/s		+21

28 August, Thursday. day, 24°; night, 18°; partly cloudy

29 August, fri

	745 mmHg		78%
	4.9 m/s		+21

29 August, Friday. day, 25°; night, 18°; overcast

30 August, sat

	746 mmHg		76%
	5.1 m/s		+21

30 August, Saturday. day, 24°; night, 17°; overcast

31 August, sun

	746 mmHg		75%
	4.69 m/s		+22

31 August, Sunday. day, 25°; night, 17°; clear

1 September, mon

	747 mmHg		75%
	4.4 m/s		+21

1 September, Monday. day, 24°; night, 17°; clear

2 September, tue

	746 mmHg		75%
	4.5 m/s		+22

2 September, Tuesday. day, 24°; night, 17°; clear

3 September, wed

	746 mmHg		74%
	4.6 m/s		+22

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

4 September, thu

	746 mmHg		75%
	4.8 m/s		+21

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

5 September, fri

	747 mmHg		75%
	5 m/s		+21

5 September, Friday. day, 24°; night, 16°; clear

6 September, sat

	747 mmHg		76%
	4.69 m/s		+21

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

Average data for 10 years

Sarnia August

10

sunny days

11

days with precipitation

5

cloudy days

10 sunny days; 11 days with precipitation; 5 cloudy days;

76

%

air humidity

3.1

m/s

WindS

76

mm of precipitation

(9% of annual average)

+22

°C

Water temperature

air humidity 76%; 76 millimeters of precipitation (9% of annual average); Wind southerly 3.1 Meters per second; Water temperature +22°

Weather graphs for August

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

S

S

S

S

S

S

S

S

S

SW

S

S

S

SE

S

S

S

S

S

S

S

SW

S

S

S

S

SE

SE

S

S

S

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

31

Daytime temperature

Night-time temperature

Cities near you

Toronto
Detroit
Pittsburgh
Cleveland
Macedonia
Burlington
Buffalo
Milan
London

Cities with similar weather in August

Lisbon
Rio de Janeiro
Porto
Genoa
Santa Cruz de Tenerife
Funchal
Boston
San Diego
Playa de las Americas

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

In August, the weather in Sarnia is typically warm. Average daily high temperature in August is about 25 degrees above zero. On average, Sarnia has 11 rainy, 10 sunny, 5 cloudy, and 5 partly cloudy days in August. The rains are usually moderate.

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