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September weather forecast in Reykyavik

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		84%
	6.4 m/s		+11

31 August, Sunday. day, 12°; night, 8°; rain

1 September, mon

	753 mmHg		83%
	5.9 m/s		+11

1 September, Monday. day, 12°; night, 8°; rain

2 September, tue

	754 mmHg		81%
	5.7 m/s		+11

2 September, Tuesday. day, 12°; night, 8°; partly cloudy

3 September, wed

	754 mmHg		83%
	5.6 m/s		+11

3 September, Wednesday. day, 12°; night, 8°; partly cloudy

4 September, thu

	755 mmHg		83%
	6.1 m/s		+11

4 September, Thursday. day, 11°; night, 8°; rain

5 September, fri

	755 mmHg		83%
	5.4 m/s		+11

5 September, Friday. day, 12°; night, 7°; partly cloudy

6 September, sat

	756 mmHg		83%
	5.5 m/s		+11

6 September, Saturday. day, 11°; night, 8°; overcast

7 September, sun

	755 mmHg		82%
	6.2 m/s		+11

7 September, Sunday. day, 11°; night, 7°; rain

8 September, mon

	754 mmHg		80%
	6.1 m/s		+11

8 September, Monday. day, 11°; night, 7°; rain

9 September, tue

	755 mmHg		82%
	5.9 m/s		+11

9 September, Tuesday. day, 11°; night, 7°; rain

10 September, wed

	753 mmHg		83%
	6.4 m/s		+11

10 September, Wednesday. day, 11°; night, 7°; rain

11 September, thu

	753 mmHg		81%
	5.9 m/s		+11

11 September, Thursday. day, 10°; night, 7°; rain

12 September, fri

	754 mmHg		81%
	6.6 m/s		+10

12 September, Friday. day, 10°; night, 6°; rain

13 September, sat

	754 mmHg		78%
	5.9 m/s		+10

13 September, Saturday. day, 11°; night, 6°; clear

14 September, sun

	755 mmHg		79%
	6.1 m/s		+10

14 September, Sunday. day, 10°; night, 6°; clear

15 September, mon

	756 mmHg		80%
	6.1 m/s		+10

15 September, Monday. day, 10°; night, 6°; rain

16 September, tue

	755 mmHg		82%
	6.5 m/s		+10

16 September, Tuesday. day, 10°; night, 6°; rain

17 September, wed

	754 mmHg		80%
	5.9 m/s		+10

17 September, Wednesday. day, 10°; night, 6°; overcast

18 September, thu

	755 mmHg		79%
	5.8 m/s		+10

18 September, Thursday. day, 10°; night, 6°; clear

19 September, fri

	754 mmHg		83%
	6 m/s		+9

19 September, Friday. day, 10°; night, 6°; rain

20 September, sat

	752 mmHg		83%
	6.2 m/s		+9

20 September, Saturday. day, 10°; night, 6°; rain

21 September, sun

	753 mmHg		81%
	6.2 m/s		+9

21 September, Sunday. day, 9°; night, 6°; rain

22 September, mon

	754 mmHg		82%
	5.4 m/s		+9

22 September, Monday. day, 9°; night, 5°; partly cloudy

23 September, tue

	755 mmHg		82%
	5 m/s		+9

23 September, Tuesday. day, 9°; night, 5°; overcast

24 September, wed

	754 mmHg		83%
	5.9 m/s		+9

24 September, Wednesday. day, 10°; night, 5°; rain

25 September, thu

	753 mmHg		82%
	6.2 m/s		+9

25 September, Thursday. day, 9°; night, 5°; overcast

26 September, fri

	752 mmHg		83%
	6 m/s		+9

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

27 September, sat

	753 mmHg		81%
	5.4 m/s		+9

27 September, Saturday. day, 9°; night, 5°; rain

28 September, sun

	753 mmHg		80%
	5 m/s		+9

28 September, Sunday. day, 9°; night, 5°; clear

29 September, mon

	751 mmHg		82%
	6.6 m/s		+9

29 September, Monday. day, 8°; night, 4°; rain

30 September, tue

	750 mmHg		80%
	5.7 m/s		+8

30 September, Tuesday. day, 8°; night, 4°; rain

1 October, wed

	750 mmHg		82%
	6.3 m/s		+9

1 October, Wednesday. day, 8°; night, 4°; rain

2 October, thu

	749 mmHg		83%
	6.6 m/s		+8

2 October, Thursday. day, 8°; night, 5°; rain

3 October, fri

	750 mmHg		80%
	5.9 m/s		+8

3 October, Friday. day, 7°; night, 4°; rain

4 October, sat

	751 mmHg		80%
	6.1 m/s		+8

4 October, Saturday. day, 7°; night, 3°; rain

Average data for 10 years

Reykyavik September

4

sunny days

18

days with precipitation

17

cloudy days

4 sunny days; 18 days with precipitation; 17 cloudy days;

82

%

air humidity

4.19

m/s

WindSE

136

mm of precipitation

(11% of annual average)

+10

°C

Water temperature

air humidity 82%; 136 millimeters of precipitation (11% of annual average); Wind south-easterly 4.19 Meters per second; Water temperature +10°

Weather graphs for September

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

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SE

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SE

SE

SE

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SE

SE

SE

SE

SE

SE

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SE

SE

1

Average data for 10 years

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30

Daytime temperature

Night-time temperature

Cities near you

Torshavn
Akureyri
Isafjordur
Jan Mayen
Selfoss
Vestmannaeyjar
Borgarnes
Akranes
Sejdisfjordur

Cities with similar weather in September

Cholpon-Ata
Wellington
Nuuk
Ushuaia
Christchurch
Hobart
Punta-Arenas
San-Carlos-de-Bariloche
Puerto Mont

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

September in Reykyavik is the rainiest month of the year. In September, the weather in Reykyavik is typically warm. Average daily high temperature in September is about 10 degrees above zero. On average, Reykyavik has 18 rainy, 4 sunny, 4 cloudy, and 4 partly cloudy days in September. The rains are usually heavy. September as well as January, February, March, and April is considered the most uncomfortable time to visit Reykyavik.

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