Weather in Reykjavík

Rain is rain in every month and about 1638 mm across the year. The wettest month is September at 181 mm; the driest is June at 83 mm.

Reykjavík is in Iceland at 64.1°N. The 2001–2020 NASA POWER daily record describes a mild oceanic climate. July is the warmest month (average 11.0°C, high 13.4°C) and January is the coolest (average 0.0°C, low -1.7°C). On this site the months that score closest to a 22°C day, lighter rain, and moderate humidity are June, July, and August.

Rain through the year

Rain does not take a season off. Reykjavík receives about 1638 mm a year, and even June still sees 83 mm. September is the peak at 181 mm and 22 days with at least 1 mm.

Humidity peaks near 92%. That usually lines up with the wetter months rather than the hottest ones.

How warm Reykjavík gets

The heat peaks in July, when the typical afternoon is 13.4°C. The opposite pole is January, when mornings average -1.7°C.

Across the year the mean afternoon high is 6.5°C. If you want the smallest day–night shock, look at months where the high and low sit close together; July nights still hold 8.6°C.

Distinctive months in Reykjavík

The year bottoms out in January. Plan for -1.7°C at night and 1.7°C in the afternoon. June is the driest month, averaging only 83 mm across 16 rainy days. Highs sit near 11.7°C. Peak heat arrives in July: 13.4°C by day, 8.6°C at night, and 83% humidity.

September is the wettest month — 181 mm and 22 rainy days, with 88% humidity. October: 5.9°C high, 2.5°C low, 147 mm rain, 91% humidity.

When the score favours a visit

The three months with the highest comfort score are June, July, and August: June (9.2°C average, 83 mm, 83% humidity); July (11.0°C average, 99 mm, 83% humidity); August (10.5°C average, 121 mm, 85% humidity). They fall in calendar order. The score rewards averages near 22°C, lower rainfall, and humidity near 60%. It is a climate score, not a festival or price calendar.

If you prefer the hottest stretch, that is July. The coolest stretch is January.

Reykjavík and other cities in Iceland

Reykjavík is the only Iceland city in this dataset, so the figures on this page are the national sample we publish. They still come from the same NASA POWER daily series (2001–2020) used everywhere else on the site.