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September weather forecast in Keflavík

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

	753 mmHg		84%
	10.8 m/s		+11

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

1 September, mon

	752 mmHg		83%
	9.8 m/s		+11

1 September, Monday. day, 11°; night, 9°; rain

2 September, tue

	753 mmHg		81%
	9.8 m/s		+11

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

3 September, wed

	754 mmHg		84%
	9.7 m/s		+11

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

4 September, thu

	754 mmHg		84%
	10 m/s		+11

4 September, Thursday. day, 10°; night, 9°; rain

5 September, fri

	755 mmHg		83%
	9.3 m/s		+11

5 September, Friday. day, 10°; night, 9°; clear

6 September, sat

	755 mmHg		83%
	9.5 m/s		+11

6 September, Saturday. day, 10°; night, 9°; overcast

7 September, sun

	754 mmHg		82%
	10.2 m/s		+11

7 September, Sunday. day, 10°; night, 9°; overcast

8 September, mon

	754 mmHg		81%
	10.2 m/s		+11

8 September, Monday. day, 10°; night, 9°; overcast

9 September, tue

	754 mmHg		81%
	9.89 m/s		+11

9 September, Tuesday. day, 10°; night, 8°; rain

10 September, wed

	753 mmHg		83%
	10.6 m/s		+11

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

11 September, thu

	753 mmHg		81%
	10.1 m/s		+11

11 September, Thursday. day, 9°; night, 8°; rain

12 September, fri

	753 mmHg		80%
	10.8 m/s		+11

12 September, Friday. day, 10°; night, 8°; rain

13 September, sat

	753 mmHg		79%
	10.3 m/s		+11

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

14 September, sun

	755 mmHg		80%
	10.4 m/s		+11

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

15 September, mon

	756 mmHg		80%
	10 m/s		+11

15 September, Monday. day, 9°; night, 8°; rain

16 September, tue

	754 mmHg		81%
	10.8 m/s		+11

16 September, Tuesday. day, 9°; night, 8°; overcast

17 September, wed

	753 mmHg		79%
	9.89 m/s		+10

17 September, Wednesday. day, 9°; night, 8°; overcast

18 September, thu

	754 mmHg		78%
	10.2 m/s		+10

18 September, Thursday. day, 9°; night, 8°; partly cloudy

19 September, fri

	753 mmHg		81%
	10.4 m/s		+10

19 September, Friday. day, 9°; night, 8°; rain

20 September, sat

	752 mmHg		82%
	10.5 m/s		+10

20 September, Saturday. day, 9°; night, 8°; rain

21 September, sun

	752 mmHg		80%
	10.8 m/s		+10

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

22 September, mon

	754 mmHg		80%
	9.89 m/s		+10

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

23 September, tue

	754 mmHg		81%
	8.8 m/s		+10

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

24 September, wed

	753 mmHg		81%
	10.4 m/s		+10

24 September, Wednesday. day, 9°; night, 7°; rain

25 September, thu

	753 mmHg		81%
	10.5 m/s		+10

25 September, Thursday. day, 9°; night, 7°; partly cloudy

26 September, fri

	751 mmHg		82%
	10.3 m/s		+10

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

27 September, sat

	752 mmHg		78%
	9.39 m/s		+10

27 September, Saturday. day, 8°; night, 7°; rain

28 September, sun

	752 mmHg		78%
	9 m/s		+10

28 September, Sunday. day, 8°; night, 7°; partly cloudy

29 September, mon

	750 mmHg		80%
	11.1 m/s		+10

29 September, Monday. day, 8°; night, 6°; rain

30 September, tue

	749 mmHg		78%
	10.4 m/s		+10

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

1 October, wed

	750 mmHg		80%
	11.1 m/s		+10

1 October, Wednesday. day, 8°; night, 6°; rain

2 October, thu

	749 mmHg		81%
	11.4 m/s		+10

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

3 October, fri

	749 mmHg		77%
	10.8 m/s		+9

3 October, Friday. day, 7°; night, 6°; rain

4 October, sat

	751 mmHg		78%
	10.9 m/s		+9

4 October, Saturday. day, 7°; night, 6°; partly cloudy

Average data for 10 years

Keflavík September

2

sunny days

19

days with precipitation

15

cloudy days

2 sunny days; 19 days with precipitation; 15 cloudy days;

81

%

air humidity

7.5

m/s

WindSE

150

mm of precipitation

(11% of annual average)

+11

°C

Water temperature

air humidity 81%; 150 millimeters of precipitation (11% of annual average); Wind south-easterly 7.5 Meters per second; Water temperature +11°

Weather graphs for September

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

S

SE

S

S

S

S

S

S

S

SE

S

S

SE

SE

S

SE

SE

SE

SE

SE

SE

SE

SE

SE

SE

SE

SE

S

SE

SE

1

Average data for 10 years

2

3

4

5

6

7

8

9

10

11

12

13

14

15

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18

19

20

21

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27

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29

30

Daytime temperature

Night-time temperature

Cities near you

Reykyavik
Torshavn
Akureyri
Isafjordur
Jan Mayen
Selfoss
Vestmannaeyjar
Borgarnes
Akranes

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 Keflavík is the rainiest month of the year. In September, the weather in Keflavík is typically cold. Average daily high temperature in September is about 9 degrees above zero. On average, Keflavík has 19 rainy, 5 cloudy, 4 partly cloudy, and 2 sunny 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 Keflavík.

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