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August weather forecast in Ottawa

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		75%
	4.9 m/s

27 July, Sunday. day, 28°; night, 19°; rain

28 July, mon

	744 mmHg		74%
	4.4 m/s

28 July, Monday. day, 28°; night, 20°; rain

29 July, tue

	744 mmHg		73%
	4.3 m/s

29 July, Tuesday. day, 28°; night, 19°; clear

30 July, wed

	745 mmHg		73%
	3.9 m/s

30 July, Wednesday. day, 28°; night, 19°; clear

31 July, thu

	745 mmHg		73%
	4 m/s

31 July, Thursday. day, 28°; night, 19°; clear

1 August, fri

	745 mmHg		73%
	3.9 m/s

1 August, Friday. day, 28°; night, 19°; clear

2 August, sat

	744 mmHg		72%
	4 m/s

2 August, Saturday. day, 28°; night, 19°; clear

3 August, sun

	744 mmHg		74%
	4 m/s

3 August, Sunday. day, 29°; night, 19°; clear

4 August, mon

	744 mmHg		74%
	4.1 m/s

4 August, Monday. day, 28°; night, 19°; partly cloudy

5 August, tue

	745 mmHg		74%
	4.5 m/s

5 August, Tuesday. day, 27°; night, 19°; overcast

6 August, wed

	744 mmHg		73%
	3.9 m/s

6 August, Wednesday. day, 28°; night, 19°; overcast

7 August, thu

	744 mmHg		74%
	4.1 m/s

7 August, Thursday. day, 28°; night, 19°; rain

8 August, fri

	744 mmHg		74%
	4.5 m/s

8 August, Friday. day, 28°; night, 19°; partly cloudy

9 August, sat

	744 mmHg		74%
	4.5 m/s

9 August, Saturday. day, 27°; night, 19°; partly cloudy

10 August, sun

	744 mmHg		74%
	4.3 m/s

10 August, Sunday. day, 28°; night, 19°; rain

11 August, mon

	744 mmHg		74%
	4.4 m/s

11 August, Monday. day, 27°; night, 18°; clear

12 August, tue

	745 mmHg		74%
	4.1 m/s

12 August, Tuesday. day, 27°; night, 18°; partly cloudy

13 August, wed

	744 mmHg		74%
	4.1 m/s

13 August, Wednesday. day, 27°; night, 18°; clear

14 August, thu

	745 mmHg		74%
	4.19 m/s

14 August, Thursday. day, 27°; night, 18°; clear

15 August, fri

	745 mmHg		74%
	4.3 m/s

15 August, Friday. day, 27°; night, 18°; clear

16 August, sat

	745 mmHg		73%
	4.3 m/s

16 August, Saturday. day, 27°; night, 18°; rain

17 August, sun

	744 mmHg		75%
	4.3 m/s

17 August, Sunday. day, 27°; night, 18°; rain

18 August, mon

	744 mmHg		76%
	4.19 m/s

18 August, Monday. day, 26°; night, 18°; rain

19 August, tue

	744 mmHg		75%
	4.3 m/s

19 August, Tuesday. day, 27°; night, 18°; rain

20 August, wed

	744 mmHg		76%
	4.6 m/s

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

21 August, thu

	745 mmHg		75%
	4.4 m/s

21 August, Thursday. day, 27°; night, 18°; clear

22 August, fri

	745 mmHg		73%
	4.3 m/s

22 August, Friday. day, 27°; night, 18°; clear

23 August, sat

	745 mmHg		74%
	4.5 m/s

23 August, Saturday. day, 27°; night, 18°; clear

24 August, sun

	744 mmHg		74%
	4.6 m/s

24 August, Sunday. day, 28°; night, 18°; rain

25 August, mon

	745 mmHg		73%
	4.8 m/s

25 August, Monday. day, 27°; night, 19°; partly cloudy

26 August, tue

	745 mmHg		75%
	3.9 m/s

26 August, Tuesday. day, 28°; night, 19°; overcast

27 August, wed

	744 mmHg		75%
	4.5 m/s

27 August, Wednesday. day, 28°; night, 19°; partly cloudy

28 August, thu

	744 mmHg		75%
	4.5 m/s

28 August, Thursday. day, 27°; night, 19°; rain

29 August, fri

	744 mmHg		76%
	4.5 m/s

29 August, Friday. day, 27°; night, 18°; rain

30 August, sat

	745 mmHg		73%
	4.3 m/s

30 August, Saturday. day, 27°; night, 17°; partly cloudy

31 August, sun

	745 mmHg		72%
	4.19 m/s

31 August, Sunday. day, 27°; night, 17°; clear

1 September, mon

	745 mmHg		73%
	4.3 m/s

1 September, Monday. day, 27°; night, 17°; clear

2 September, tue

	745 mmHg		71%
	4.3 m/s

2 September, Tuesday. day, 27°; night, 17°; clear

3 September, wed

	745 mmHg		70%
	4.6 m/s

3 September, Wednesday. day, 28°; night, 17°; clear

4 September, thu

	745 mmHg		70%
	4.6 m/s

4 September, Thursday. day, 27°; night, 17°; rain

5 September, fri

	746 mmHg		70%
	5 m/s

5 September, Friday. day, 27°; night, 16°; clear

6 September, sat

	745 mmHg		70%
	5.1 m/s

6 September, Saturday. day, 27°; night, 17°; partly cloudy

Average data for 10 years

Ottawa August

11

sunny days

10

days with precipitation

4

cloudy days

11 sunny days; 10 days with precipitation; 4 cloudy days;

74

%

air humidity

2.8

m/s

WindS

85

mm of precipitation

(9% of annual average)

air humidity 74%; 85 millimeters of precipitation (9% of annual average); Wind southerly 2.8 Meters per second

Weather graphs for August

TemperaturePrecipitation chance, %Humidity, %Wind, m/sPressure, mmHg

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S

S

S

S

S

S

S

S

SW

S

S

S

S

S

S

S

S

S

S

S

S

S

S

S

S

S

S

S

SE

SE

1

Average data for 10 years

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

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18

19

20

21

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28

29

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31

Daytime temperature

Night-time temperature

Cities near you

Chicago
St. Louis
Indianapolis
Michigan City
Wisconsin Dells
Appleton
Dixon
Iowa City
Washington

Cities with similar weather in August

Suhum
Batumi
Heraklion
Florence
Kemer
Podgorica
Verona
Hersonisos
Kobuleti

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

In August, the weather in Ottawa is typically warm. Average daily high temperature in August is about 27 degrees above zero. On average, Ottawa has 11 sunny, 10 rainy, 7 partly cloudy, and 3 cloudy days in August. The rains are usually heavy.

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