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

The tables below list the normal May 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 May temperatures
High °F Low °F Place High °C Low °C
51 38 Akureyri 10 3
44 36 Dalatangi 7 2
45 31 Grimsstadir 7 0
49 39 Keflavik 10 4
52 36 Reykholt 11 2
50 39 Reykjavik 10 4
49 40 Reynisfjara Beach 10 4
45 37 Saudanesviti 7 3
48 38 Stykkisholmur 9 3

Precipitation

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

Average total rainfall plus snowfall in May
Days Place Inches Milli­metres
6 Akureyri 0.9 24
11 Dalatangi 4.1 105
7 Grimsstadir 1.0 26
12 Keflavik 2.7 67
12 Reykholt 3.2 83
11 Reykjavik 2.1 53
13 Reynisfjara Beach 4.0 102
10 Saudanesviti 2.2 55
9 Stykkisholmur 1.6 40

Sunshine and Fog

Average hours of sun and number of days with fog in May
Hours Sun PlaceDays Fog
171 Akureyri 1
Dalatangi 6
Grimsstadir 3
Keflavik 3
Reykholt 1
209 Reykjavik 1
Reynisfjara Beach 2
Saudanesviti 3
Stykkisholmur 1

Humidity

May's average relative humidity (%)
Place Humidity
Akureyri 77
Dalatangi 83
Kirkjubaejar­klaustur 76
Raufarhöfn 84
Reykjavík 76
Stykkishólmur 78
Vestmannaeyjar 82
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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