Average data for 10 years
1 September
Sunday
+11°
+10°
2 September
Monday
+11°
+10°
3 September
Tuesday
+12°
+10°
4 September
Wednesday
+11°
+10°
5 September
Thursday
+11°
+10°
6 September
Friday
+11°
+9°
7 September
Saturday
+10°
+9°
8 September
Sunday
+10°
+9°
9 September
Monday
+11°
+9°
10 September
Tuesday
+10°
+9°
11 September
Wednesday
+10°
+9°
12 September
Thursday
+10°
+9°
13 September
Friday
+11°
+9°
14 September
Saturday
+10°
+9°
15 September
Sunday
+10°
+9°
16 September
Monday
+10°
+9°
17 September
Tuesday
+9°
+8°
18 September
Wednesday
+9°
+8°
19 September
Thursday
+9°
+8°
20 September
Friday
+9°
+7°
21 September
Saturday
+9°
+8°
22 September
Sunday
+9°
+8°
23 September
Monday
+10°
+9°
24 September
Tuesday
+10°
+9°
25 September
Wednesday
+10°
+8°
26 September
Thursday
+8°
+7°
27 September
Friday
+8°
+7°
28 September
Saturday
+9°
+8°
29 September
Sunday
+8°
+7°
30 September
Monday
+8°
+7°
Cities with similar weather in September
Kyrgyzstan
Cholpon-Ata
New Zealand
Wellington
Greenland
Nuuk
Argentina
Ushuaia
New Zealand
Christchurch
In September, the weather in Keflavík is typically warm. Average daily high temperature in September is about 10 degrees above zero. On average, Keflavík has 25 rainy, 4 sunny, and 1 partly cloudy day 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.