Keflavík in september: average Weather, Temperature and Climate
Weather in Keflavík in september 2025
The weather in Keflavík in the month of september comes from statistical datas on the past years. You can view the weather statistics for the whole month, but also by clicking on the tabs for the beginning, the middle and the end of the month.
Average weather throughout september
bad weather 11.1cm
Weather at 6am
50°F
Moderate rain at times
34% of time
24%
17%
16%
Weather at 12pm
50°F
Moderate rain at times
34% of time
20%
19%
15%
Weather at 6pm
50°F
Moderate rain at times
32% of time
23%
19%
18%
Weather at 3am
50°F
34%
19%
19%
17%
Evolution of daily average temperature and precipitation in Keflavík in september
These charts show the evolution of average minimum/maximum temperatures as well as average daily precipitation volume in Keflavík in september.
The climate of Keflavík in september is bad
In september in Keflavík, the climate is wet (with 8in of precipitation over 13 days). It should be noted a worsening from the previous month since in august there is an average of 4.9in of precipitation over 7 days.
The climate is fairly fresh in this location september, but it is liveable by dressing warm. Temperatures are up to 52°F. In the morning the temperature drops to 49°F. Thus, the mean temperature average in september in Keflavík is 50°F. Note that seasonal normals are in contrast with those observed in Keflavík in the month of september with a maximum record of 59°F in 2010 and a minimum record of 36°F in 2020.
On average, in Keflavík, the days of september last 13:01. The sun rises at 06:54 and sunset is at 19:55.
With a bad weather, september is not recommended to go in that area in Iceland.
Seasonal average climate and temperature of Keflavík in september
Check below seasonal norms These statistics are generated from the weather statements of the last years of september.
| September | |||||
| Outside temperature | |||||
| Average temperature | 50°F | ||||
| Highest temperature | 52°F | ||||
| Lowest temperature | 49°F | ||||
| Highest record temperature | 59°F (2010) | ||||
| Lowest record temperature | 36°F (2020) | ||||
| Sea temperature | |||||
| Average sea temperature | 50°F | ||||
| Lowest sea temperature | 47°F | ||||
| Highest sea temperature | 53°F | ||||
| Wind | |||||
| Wind speed | 35km/h | ||||
| Wind temperature | 43°F | ||||
| Precipitation (rainfall) | |||||
| Rainfall | 8in | ||||
| Number of days with rainfall | 13 day(s) (42%) | ||||
| Record daily rainfall | 2.8in (2019) | ||||
| Snowfall | 11.1cm | ||||
| Other climate data | |||||
| Humidity | 83% | ||||
| Visibility | 8.85km | ||||
| Cloud cover | 64% | ||||
| UV index | 3 | ||||
| Daily sunshine hours | 9 | ||||
| Sunrise and sunset | |||||
| Time of sunrise | 06:54 | ||||
| Time of sunset | 19:55 | ||||
| Length of day | 13:01 | ||||
| Our opinion about the weather in september | |||||
| Our opinion at whereandwhen.net | bad | ||||
How was the weather last september?
Here is the day by day recorded weather in Keflavík in september 2024:
50°F to 52°F
50°F to 52°F
45°F to 50°F
45°F to 49°F
50°F to 52°F
49°F to 50°F
49°F to 50°F
45°F to 47°F
36°F to 43°F
40°F to 43°F
36°F to 47°F
38°F to 50°F
40°F to 49°F
41°F to 49°F
41°F to 47°F
41°F to 50°F
49°F to 50°F
45°F to 50°F
40°F to 47°F
40°F to 49°F
47°F to 49°F
47°F to 50°F
45°F to 47°F
41°F to 47°F
38°F to 47°F
36°F to 45°F
38°F to 43°F
38°F to 45°F
41°F to 45°F
36°F to 43°F
Map: other cities in Iceland in september
Cities near Keflavík:
| Vogar in september | bad weather |
| Suðurnesjabær in september | bad weather |
| Grindavík in september | bad weather |
| Seltjarnarnes in september | bad weather |
| Kopavogur in september | bad weather |
| Reykjavík in september | bad weather |
| Akranes in september | bad weather |
| Mosfellsbaer in september | bad weather |
| Hveragerdi in september | bad weather |
| Borgarnes in september | bad weather |
| Thingvellir in september | bad weather |
| Selfoss in september | bad weather |
Click over cities on the map for information about the weather in september.
Keflavík
perfect weather
good
tolerable
bad
very bad
Weather data for Keflavík in september:
Weather data for Keflavík for september are derived from an average of the weather forecast since 2009 in Keflavík. There is a margin of error and these forecasts are to be considered as general information only. The weather in Keflavík can vary slightly from year to year, but this data should limit surprises. So you can pack your bags or check for the best time in year to go to Keflavík.