10 day forecast Monthly forecast Weather map

City or area

Go to comparison

August weather forecast in Portland

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

	754 mmHg		81%
	4.4 m/s		+19

27 July, Sunday. day, 22°; night, 19°; partly cloudy

28 July, mon

	754 mmHg		83%
	5 m/s		+19

28 July, Monday. day, 22°; night, 19°; clear

29 July, tue

	754 mmHg		81%
	4.8 m/s		+19

29 July, Tuesday. day, 22°; night, 19°; clear

30 July, wed

	755 mmHg		79%
	4.3 m/s		+19

30 July, Wednesday. day, 22°; night, 19°; rain

31 July, thu

	756 mmHg		75%
	4.9 m/s		+19

31 July, Thursday. day, 22°; night, 18°; partly cloudy

1 August, fri

	756 mmHg		81%
	4.5 m/s		+20

1 August, Friday. day, 22°; night, 19°; partly cloudy

2 August, sat

	756 mmHg		87%
	4 m/s		+19

2 August, Saturday. day, 21°; night, 19°; rain

3 August, sun

	755 mmHg		82%
	4.1 m/s		+20

3 August, Sunday. day, 22°; night, 18°; partly cloudy

4 August, mon

	755 mmHg		81%
	5 m/s		+20

4 August, Monday. day, 22°; night, 19°; clear

5 August, tue

	755 mmHg		81%
	4.6 m/s		+20

5 August, Tuesday. day, 22°; night, 19°; clear

6 August, wed

	755 mmHg		75%
	5.5 m/s		+20

6 August, Wednesday. day, 22°; night, 18°; partly cloudy

7 August, thu

	755 mmHg		75%
	5 m/s		+20

7 August, Thursday. day, 21°; night, 18°; partly cloudy

8 August, fri

	755 mmHg		76%
	4.9 m/s		+20

8 August, Friday. day, 21°; night, 17°; rain

9 August, sat

	756 mmHg		79%
	5.4 m/s		+19

9 August, Saturday. day, 21°; night, 18°; rain

10 August, sun

	756 mmHg		81%
	5 m/s		+20

10 August, Sunday. day, 21°; night, 18°; partly cloudy

11 August, mon

	756 mmHg		82%
	5.3 m/s		+20

11 August, Monday. day, 21°; night, 19°; clear

12 August, tue

	756 mmHg		83%
	4.5 m/s		+20

12 August, Tuesday. day, 21°; night, 18°; overcast

13 August, wed

	755 mmHg		81%
	5.4 m/s		+19

13 August, Wednesday. day, 21°; night, 18°; clear

14 August, thu

	756 mmHg		79%
	4.8 m/s		+20

14 August, Thursday. day, 21°; night, 18°; partly cloudy

15 August, fri

	756 mmHg		80%
	5.1 m/s		+20

15 August, Friday. day, 21°; night, 18°; partly cloudy

16 August, sat

	757 mmHg		79%
	4.4 m/s		+20

16 August, Saturday. day, 22°; night, 19°; clear

17 August, sun

	757 mmHg		77%
	3.9 m/s		+20

17 August, Sunday. day, 22°; night, 19°; rain

18 August, mon

	755 mmHg		75%
	5 m/s		+20

18 August, Monday. day, 22°; night, 19°; clear

19 August, tue

	755 mmHg		77%
	4.5 m/s		+21

19 August, Tuesday. day, 23°; night, 19°; rain

20 August, wed

	756 mmHg		75%
	4.5 m/s		+20

20 August, Wednesday. day, 22°; night, 19°; clear

21 August, thu

	757 mmHg		79%
	4.5 m/s		+20

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

22 August, fri

	757 mmHg		80%
	5.8 m/s		+20

22 August, Friday. day, 22°; night, 19°; clear

23 August, sat

	757 mmHg		76%
	5.1 m/s		+19

23 August, Saturday. day, 21°; night, 19°; partly cloudy

24 August, sun

	759 mmHg		75%
	5.1 m/s		+19

24 August, Sunday. day, 21°; night, 18°; clear

25 August, mon

	758 mmHg		81%
	5.3 m/s		+19

25 August, Monday. day, 21°; night, 19°; partly cloudy

26 August, tue

	757 mmHg		79%
	5 m/s		+20

26 August, Tuesday. day, 22°; night, 19°; partly cloudy

27 August, wed

	758 mmHg		73%
	4.6 m/s		+20

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

28 August, thu

	757 mmHg		74%
	5.5 m/s		+19

28 August, Thursday. day, 21°; night, 17°; partly cloudy

29 August, fri

	758 mmHg		75%
	6 m/s		+19

29 August, Friday. day, 20°; night, 18°; clear

30 August, sat

	757 mmHg		73%
	4.5 m/s		+20

30 August, Saturday. day, 21°; night, 17°; clear

31 August, sun

	756 mmHg		72%
	4.5 m/s		+20

31 August, Sunday. day, 22°; night, 18°; rain

1 September, mon

	757 mmHg		74%
	4.8 m/s		+20

1 September, Monday. day, 21°; night, 18°; clear

2 September, tue

	757 mmHg		75%
	4.4 m/s		+19

2 September, Tuesday. day, 21°; night, 18°; clear

3 September, wed

	756 mmHg		80%
	5 m/s		+19

3 September, Wednesday. day, 21°; night, 18°; rain

4 September, thu

	756 mmHg		75%
	5.5 m/s		+19

4 September, Thursday. day, 21°; night, 17°; clear

5 September, fri

	757 mmHg		74%
	6 m/s		+19

5 September, Friday. day, 21°; night, 17°; clear

6 September, sat

	759 mmHg		75%
	6.5 m/s		+18

6 September, Saturday. day, 20°; night, 17°; partly cloudy

Average data for 10 years

Portland August

14

sunny days

6

days with precipitation

11

cloudy days

14 sunny days; 6 days with precipitation; 11 cloudy days;

76

%

air humidity

3

m/s

WindSW

66

mm of precipitation

(7% of annual average)

+20

°C

Water temperature

air humidity 76%; 66 millimeters of precipitation (7% of annual average); Wind south-westerly 3 Meters per second; Water temperature +20°

Weather graphs for August

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

S

SE

S

S

SW

SW

SW

SW

S

S

S

SE

SE

SW

S

SW

SW

SW

SW

W

S

S

N

S

SE

SW

W

SE

NE

W

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

Boston
Montreal
Colchester
Quebec
Anjou
Laval
Nantucket
Bangor
Berlin

Cities with similar weather in August

Lisbon
Vancouver
Porto
Santa Cruz de Tenerife
Seattle
Las Palmas de Gran Canaria
Playa de las Americas
Montreal
Port Louis

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

In August, the weather in Portland is typically warm. Average daily high temperature in August is about 21 degrees above zero. On average, Portland has 13 sunny, 11 partly cloudy, 6 rainy, and 1 cloudy day in August. The rains are usually light. August as well as {{month_nom: February}}, and {{month_nom: February}} is considered the most comfortable time to visit Portland.

Links

Help Terms of use Contact us

For partners

Advertisement Yandex.Weather API

Weather forecasts

Hourly forecast Detailed 10 day forecast Monthly forecast Weather map Magnetic storms

Download app

English

English
Русский

Source data: Yandex.Traffic, Roshydromet FSBI "CAO", NOAA, © OpenStreetMap

© 2017–2025 YANDEX LLC