Climate averages 1991–2020
Reykjavík weather
in August.
A cool, wet month: the 2nd warmest and the 5th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a cool month in Reykjavík: daytime highs average 13.5°C and nights cool to about 8.2°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 93 mm of rain on roughly 15 days, which makes August a wet month (the 5th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 16 h 26 min on an average August day.
The nearest other city in this atlas is Tórshavn (795 km away). In August its highs average 12.4°C, 1.0°C cooler than Reykjavík, with 68 mm of rain.
From August to September, average highs fall by 3.1°C to 10.3°C, and monthly rainfall rises from 93 mm to 126 mm.
The annual picture
August in context
Monthly precipitation
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Reykjavík climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 1.0°C-3.7°C | -3.7°C | 124 | 17.9 | 5.55 h |
| February | 1.2°C-3.6°C | -3.6°C | 123 | 16.8 | 8.58 h |
| March | 2.4°C-2.7°C | -2.7°C | 114 | 16.9 | 11.712 h |
| April | 5.7°C0.0°C | 0.0°C | 90 | 15.3 | 15.015 h |
| May | 9.4°C3.3°C | 3.3°C | 83 | 14.8 | 18.418 h |
| June | 12.7°C6.8°C | 6.8°C | 69 | 12.8 | 20.821 h |
| July | 14.4°C8.7°C | 8.7°C | 76 | 13.3 | 19.720 h |
| August, selected | 13.5°C8.2°C | 8.2°C | 93 | 14.9 | 16.416 h |
| September | 10.3°C5.8°C | 5.8°C | 126 | 16.8 | 13.113 h |
| October | 6.0°C1.9°C | 1.9°C | 111 | 14.8 | 9.810 h |
| November | 2.7°C-1.1°C | -1.1°C | 113 | 15.5 | 6.67 h |
| December | 1.2°C-3.4°C | -3.4°C | 124 | 16.5 | 4.44 h |
Precipitation (rain or snow, as water) is the average of the 30 separate monthly totals. A wet day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
August in nearby cities
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Reykjavík) is explained once on the Reykjavík year overview and on the Sources, method and limits page.