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

The tables below list the normal August 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 August temperatures
High °F Low °F Place High °C Low °C
59 46 Akureyri 15 8
53 46 Dalatangi 11 8
56 41 Grimsstadir 13 5
56 48 Keflavik 14 9
60 45 Reykholt 15 7
57 47 Reykjavik 14 9
56 48 Reynisfjara Beach 14 9
53 46 Saudanesviti 12 8
56 47 Stykkisholmur 13 8

Rainfall

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

Average total precipitation in August
Days Place Inches Milli­metres
8 Akureyri 1.6 41
11 Dalatangi 5.2 131
10 Grimsstadir 1.8 45
13 Keflavik 3.5 88
14 Reykholt 4.1 104
12 Reykjavik 2.5 65
14 Reynisfjara Beach 5.5 140
12 Saudanesviti 3.4 85
10 Stykkisholmur 2.0 51

Sunshine and Fog

Average hours of sun and number of days with fog in August
Hours Sun PlaceDays Fog
138 Akureyri 1
Dalatangi 9
Grimsstadir 5
Keflavik 4
Reykholt 1
165 Reykjavik 1
Reynisfjara Beach 2
Saudanesviti 5
Stykkisholmur 1

Humidity

August's average relative humidity (%)
Place Humidity
Akureyri 79
Dalatangi 85
Kirkjubaejar­klaustur 81
Raufarhöfn 88
Reykjavík 81
Stykkishólmur 81
Vestmannaeyjar 87
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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