September Weather in Iceland:
Average Temperature, Rainfall, Sunshine and Humidity

The tables below list the normal September temperatures and precipitation for places in Iceland. There's also information on this month's averages for sun, fog and humidity.

All the climate measures are averages of data collected at weather stations from 1991 to 2020, except for humidity which covers 1961 to 1990.

The weather information takes in all the coasts of Iceland and a few places in between. Capital city Reykjavík is in southwest Iceland. Also on the west coast, Stykkisholmur lies north of Reykjavík, while Keflavik is to the west.

Along Iceland's north coast is the town of Akureyri and farther north the Saudanesviti lighthouse. Dalatangi sits on the outer edge of Iceland's east coast. In the highlands between those two places is Grimsstadir.

Southern Iceland is where you'll find Reynisfjara Beach as well as Reykholt, an inland farming area near Thingvellir National Park.

Temperature

Average September temperatures
High °F Low °F Place High °C Low °C
53 42 Akureyri 12 5
51 43 Dalatangi 10 6
49 36 Grimsstadir 9 2
52 44 Keflavik 11 7
53 40 Reykholt 12 5
53 43 Reykjavik 11 6
53 44 Reynisfjara Beach 11 7
51 42 Saudanesviti 10 6
51 43 Stykkisholmur 11 6

Rainfall

The number of days only includes the days when precipitation totalled at least one millimetre (0.04 inches).

Average total precipitation in September
Days Place Inches Milli­metres
9 Akureyri 2.1 53
14 Dalatangi 6.6 168
10 Grimsstadir 1.8 47
16 Keflavik 4.8 121
16 Reykholt 5.8 147
15 Reykjavik 3.4 87
18 Reynisfjara Beach 7.4 188
15 Saudanesviti 4.5 113
13 Stykkisholmur 3.1 78

Sunshine and Fog

Average hours of sun and number of days with fog in September
Hours Sun PlaceDays Fog
90 Akureyri 1
Dalatangi 4
Grimsstadir 5
Keflavik 3
Reykholt 1
118 Reykjavik 1
Reynisfjara Beach 2
Saudanesviti 2
Stykkisholmur 0

Humidity

September's average relative humidity (%)
Place Humidity
Akureyri 80
Dalatangi 81
Kirkjubaejar­klaustur 79
Raufarhöfn 87
Reykjavík 79
Stykkishólmur 79
Vestmannaeyjar 84
References

NOAA National Centers for Environmental Information. WMO Climate Normals. Station Data Files. Index of /archive/arc0216/0253808/1.1/data/0-data/Region-6-WMO-Normals-9120/Iceland/CSV.

World Data Center for Meteorology. Climate of the World.

Iceland
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