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August weather forecast in Ontario

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

	695 mmHg		51%
	3.1 m/s

27 July, Sunday. day, 31°; night, 18°; clear

28 July, mon

	695 mmHg		50%
	3 m/s

28 July, Monday. day, 30°; night, 18°; clear

29 July, tue

	695 mmHg		50%
	3 m/s

29 July, Tuesday. day, 31°; night, 18°; clear

30 July, wed

	695 mmHg		51%
	3 m/s

30 July, Wednesday. day, 30°; night, 18°; rain

31 July, thu

	695 mmHg		52%
	3.1 m/s

31 July, Thursday. day, 30°; night, 18°; partly cloudy

1 August, fri

	696 mmHg		51%
	3 m/s

1 August, Friday. day, 30°; night, 18°; partly cloudy

2 August, sat

	696 mmHg		49%
	3 m/s

2 August, Saturday. day, 31°; night, 18°; clear

3 August, sun

	695 mmHg		49%
	3 m/s

3 August, Sunday. day, 30°; night, 18°; clear

4 August, mon

	695 mmHg		49%
	3 m/s

4 August, Monday. day, 30°; night, 18°; clear

5 August, tue

	695 mmHg		47%
	3.1 m/s

5 August, Tuesday. day, 30°; night, 18°; clear

6 August, wed

	695 mmHg		47%
	3.1 m/s

6 August, Wednesday. day, 30°; night, 17°; clear

7 August, thu

	695 mmHg		48%
	3.1 m/s

7 August, Thursday. day, 30°; night, 17°; clear

8 August, fri

	695 mmHg		47%
	3 m/s

8 August, Friday. day, 30°; night, 17°; clear

9 August, sat

	695 mmHg		46%
	3 m/s

9 August, Saturday. day, 30°; night, 17°; clear

10 August, sun

	695 mmHg		48%
	3 m/s

10 August, Sunday. day, 30°; night, 18°; clear

11 August, mon

	695 mmHg		48%
	3 m/s

11 August, Monday. day, 30°; night, 18°; clear

12 August, tue

	695 mmHg		47%
	3 m/s

12 August, Tuesday. day, 31°; night, 18°; clear

13 August, wed

	695 mmHg		45%
	3 m/s

13 August, Wednesday. day, 31°; night, 18°; clear

14 August, thu

	695 mmHg		45%
	3.1 m/s

14 August, Thursday. day, 31°; night, 18°; clear

15 August, fri

	695 mmHg		46%
	3 m/s

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

16 August, sat

	695 mmHg		47%
	3 m/s

16 August, Saturday. day, 31°; night, 18°; clear

17 August, sun

	695 mmHg		47%
	3 m/s

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

18 August, mon

	695 mmHg		48%
	3.2 m/s

18 August, Monday. day, 30°; night, 18°; clear

19 August, tue

	694 mmHg		49%
	3.1 m/s

19 August, Tuesday. day, 30°; night, 17°; clear

20 August, wed

	694 mmHg		50%
	3.1 m/s

20 August, Wednesday. day, 29°; night, 17°; clear

21 August, thu

	695 mmHg		51%
	3.1 m/s

21 August, Thursday. day, 29°; night, 17°; rain

22 August, fri

	695 mmHg		49%
	3 m/s

22 August, Friday. day, 30°; night, 17°; clear

23 August, sat

	695 mmHg		49%
	3.1 m/s

23 August, Saturday. day, 30°; night, 17°; clear

24 August, sun

	694 mmHg		47%
	3.1 m/s

24 August, Sunday. day, 30°; night, 18°; clear

25 August, mon

	695 mmHg		47%
	3.2 m/s

25 August, Monday. day, 30°; night, 18°; clear

26 August, tue

	695 mmHg		46%
	3.1 m/s

26 August, Tuesday. day, 31°; night, 18°; clear

27 August, wed

	694 mmHg		45%
	3 m/s

27 August, Wednesday. day, 31°; night, 18°; rain

28 August, thu

	694 mmHg		44%
	2.9 m/s

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

29 August, fri

	694 mmHg		43%
	3 m/s

29 August, Friday. day, 31°; night, 19°; clear

30 August, sat

	694 mmHg		45%
	3 m/s

30 August, Saturday. day, 31°; night, 19°; clear

31 August, sun

	694 mmHg		46%
	3.1 m/s

31 August, Sunday. day, 30°; night, 18°; clear

1 September, mon

	694 mmHg		46%
	3 m/s

1 September, Monday. day, 30°; night, 18°; clear

2 September, tue

	694 mmHg		49%
	3 m/s

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

3 September, wed

	694 mmHg		51%
	3 m/s

3 September, Wednesday. day, 30°; night, 18°; rain

4 September, thu

	694 mmHg		49%
	3 m/s

4 September, Thursday. day, 30°; night, 18°; clear

5 September, fri

	694 mmHg		48%
	2.9 m/s

5 September, Friday. day, 30°; night, 18°; clear

6 September, sat

	695 mmHg		47%
	2.9 m/s

6 September, Saturday. day, 30°; night, 18°; clear

Average data for 10 years

Ontario August

28

sunny days

2

days with precipitation

1

cloudy day

28 sunny days; 2 days with precipitation; 1 cloudy day;

47

%

air humidity

1.4

m/s

WindSW

11

mm of precipitation

(3% of annual average)

air humidity 47%; 11 millimeters of precipitation (3% of annual average); Wind south-westerly 1.4 Meters per second

Weather graphs for August

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

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

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

31

Daytime temperature

Night-time temperature

Cities near you

Los Angeles
Las Vegas
San Diego
Yuma
Santa Monica
Beverly Hills
Mexicali
Santa Barbara
Glendale

Cities with similar weather in August

Goa
Alexandria
Galle
Bari
Ischia
Honolulu
Zakynthos
Hikkaduwa
Nusa-Dua

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

August in Ontario is the sunniest and the hottest month of the year. In August, the weather in Ontario is typically hot. Average daily high temperature in August is about 30 degrees above zero. On average, Ontario has 28 sunny, 2 rainy, and 1 partly cloudy day in August. The rains are usually light.

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