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September weather forecast in Harstad

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

	754 mmHg		82%
	6.5 m/s		+11

31 August, Sunday. day, 11°; night, 9°; rain

1 September, mon

	755 mmHg		80%
	6 m/s		+11

1 September, Monday. day, 11°; night, 9°; partly cloudy

2 September, tue

	753 mmHg		80%
	6.3 m/s		+11

2 September, Tuesday. day, 12°; night, 10°; partly cloudy

3 September, wed

	753 mmHg		81%
	7.2 m/s		+11

3 September, Wednesday. day, 12°; night, 9°; rain

4 September, thu

	753 mmHg		82%
	6.9 m/s		+11

4 September, Thursday. day, 11°; night, 9°; rain

5 September, fri

	753 mmHg		83%
	6.7 m/s		+11

5 September, Friday. day, 11°; night, 9°; rain

6 September, sat

	752 mmHg		82%
	6.7 m/s		+11

6 September, Saturday. day, 11°; night, 9°; rain

7 September, sun

	752 mmHg		81%
	5.4 m/s		+11

7 September, Sunday. day, 11°; night, 9°; overcast

8 September, mon

	752 mmHg		81%
	6.4 m/s		+11

8 September, Monday. day, 11°; night, 9°; partly cloudy

9 September, tue

	752 mmHg		82%
	6.8 m/s		+11

9 September, Tuesday. day, 11°; night, 9°; rain

10 September, wed

	752 mmHg		83%
	6.7 m/s		+11

10 September, Wednesday. day, 11°; night, 9°; rain

11 September, thu

	751 mmHg		82%
	6.3 m/s		+11

11 September, Thursday. day, 11°; night, 9°; rain

12 September, fri

	750 mmHg		82%
	6.1 m/s		+11

12 September, Friday. day, 11°; night, 9°; partly cloudy

13 September, sat

	751 mmHg		81%
	6.6 m/s		+11

13 September, Saturday. day, 10°; night, 8°; overcast

14 September, sun

	751 mmHg		79%
	6.6 m/s		+11

14 September, Sunday. day, 10°; night, 8°; partly cloudy

15 September, mon

	750 mmHg		80%
	6.3 m/s		+11

15 September, Monday. day, 10°; night, 8°; partly cloudy

16 September, tue

	751 mmHg		80%
	6.5 m/s		+11

16 September, Tuesday. day, 10°; night, 8°; clear

17 September, wed

	752 mmHg		81%
	7.1 m/s		+11

17 September, Wednesday. day, 10°; night, 8°; rain

18 September, thu

	752 mmHg		81%
	6.9 m/s		+11

18 September, Thursday. day, 10°; night, 8°; rain

19 September, fri

	753 mmHg		81%
	6.6 m/s		+10

19 September, Friday. day, 9°; night, 7°; rain

20 September, sat

	752 mmHg		80%
	7.3 m/s		+11

20 September, Saturday. day, 9°; night, 7°; rain

21 September, sun

	751 mmHg		80%
	7.1 m/s		+10

21 September, Sunday. day, 9°; night, 7°; rain

22 September, mon

	751 mmHg		80%
	7 m/s		+10

22 September, Monday. day, 9°; night, 7°; rain

23 September, tue

	749 mmHg		80%
	7.6 m/s		+10

23 September, Tuesday. day, 9°; night, 7°; rain

24 September, wed

	751 mmHg		79%
	7.4 m/s		+10

24 September, Wednesday. day, 8°; night, 6°; rain

25 September, thu

	751 mmHg		80%
	7.3 m/s		+10

25 September, Thursday. day, 8°; night, 6°; rain

26 September, fri

	751 mmHg		79%
	7.5 m/s		+10

26 September, Friday. day, 8°; night, 7°; rain

27 September, sat

	751 mmHg		81%
	6.9 m/s		+10

27 September, Saturday. day, 8°; night, 6°; rain

28 September, sun

	751 mmHg		81%
	6.5 m/s		+10

28 September, Sunday. day, 8°; night, 6°; clear

29 September, mon

	750 mmHg		81%
	6.8 m/s		+10

29 September, Monday. day, 8°; night, 6°; partly cloudy

30 September, tue

	751 mmHg		79%
	6.3 m/s		+10

30 September, Tuesday. day, 8°; night, 6°; clear

1 October, wed

	750 mmHg		80%
	6.3 m/s		+10

1 October, Wednesday. day, 8°; night, 6°; partly cloudy

2 October, thu

	750 mmHg		80%
	6.3 m/s		+10

2 October, Thursday. day, 8°; night, 6°; clear

3 October, fri

	750 mmHg		77%
	6.7 m/s		+10

3 October, Friday. day, 8°; night, 6°; partly cloudy

4 October, sat

	749 mmHg		77%
	6.6 m/s		+10

4 October, Saturday. day, 8°; night, 6°; clear

Average data for 10 years

Harstad September

3

sunny days

18

days with precipitation

14

cloudy days

3 sunny days; 18 days with precipitation; 14 cloudy days;

81

%

air humidity

4.9

m/s

WindS

141

mm of precipitation

(11% of annual average)

+11

°C

Water temperature

air humidity 81%; 141 millimeters of precipitation (11% of annual average); Wind southerly 4.9 Meters per second; Water temperature +11°

Weather graphs for September

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

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SE

S

S

S

S

S

S

S

S

S

S

S

S

S

S

S

S

S

S

S

S

S

S

S

S

S

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

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23

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27

28

29

30

Daytime temperature

Night-time temperature

Cities near you

Tromsø
Bodø
Östersund
Andenes
Narvik
Svolver
Kiruna
Stokmarknes
Lycksele

Cities with similar weather in September

Helsinki
Riga
Tallinn
Stockholm
Cholpon-Ata
Oslo
Yurmala
Palanga
Dublin

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

September in Harstad is the rainiest month of the year. In September, the weather in Harstad is typically warm. Average daily high temperature in September is about 10 degrees above zero. On average, Harstad has 18 rainy, 7 partly cloudy, 3 sunny, and 2 cloudy days in September. The rains are usually heavy. September as well as April, May, June, and July is considered the most uncomfortable time to visit Harstad.

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