Weather in Reykjavik in August 2025
- August is usually the hottest month of the year in Reykjavik;
- August is usually the wettest month of the year in Reykjavik;
Average weather
Average temperature in Reykjavik in August
The expected average maximum temperature in August is +15°C with a maximum of +19°C and a minimum of +6°C.
The average maximum temperature goes down 23% by the end of the month, compared with the beginning of the month, from +15°C to +12°C.
Is Reykjavik warm or cold in August?
Reykjavik is typically mild in August.
Maximum temperatures go up compared to the previous month from +14°C to +14°C. The minimum temperature also goes up from +9°C to +9°C.
Pack a light jacket as it will be warm in the day and cool in the evenings.
August is the hottest month in Reykjavik, here is the comparison with other months:
Water temperature in Reykjavik in August
Water in Reykjavik in August is Cold. It varies from +10°C to +13°C, with an average of +11°C. This is almost similar to the air temperature, which averages +14°C.
The water temperature in August is one of the warmest of the entire year:
Can you swim in Reykjavik in August?
Climate in Reykjavik in August
| July | August | September | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +14°C | +14°C | +11°C | ||||
| Min. temperature | ||||||
| +3°C | +2°C | -3°C | ||||
| Max. temperature | ||||||
| +25°C | +24°C | +18°C | ||||
| Rainfall | ||||||
| 70 mm | 87 mm | 98 mm | ||||
| Wind | ||||||
| 3 m/s | 3 m/s | 4 m/s | ||||
| Avg. water temperature | ||||||
| +11°C | +11°C | +10°C | ||||
| Humidity | ||||||
| 78% | 79% | 78% | ||||
| Air pressure | ||||||
| 1008 HPa | 1007 HPa | 1004 HPa | ||||
| Sunny days | ||||||
| 2 | 3 | 3 | ||||
| Cloudy days | ||||||
| 9 | 8 | 7 | ||||
| Rainy days | ||||||
| 20 | 20 | 20 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
August weather is still as ok as in July. The temperature levels stay the same in the area of +14°C for average maximum temperature during the day. Prepare for more rain. Average rainfall goes from 70 mm to 87 mm. Humidity rises from 78% to 79%. The average wind speed doesn’t change much during August, staying around 3 m/s. The good news is there are likely to be more sunny days in August, from 2 to 3.
September brings much the same weather, it remains ok.
Wind
The average wind speed is 3 m/s getting up to 5 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in Reykjavik is gradually increasing during August, going from 2 m/s to 3 m/s over the course of the month.
Rain
How was the weather last August in Reykjavik?
Climate Change over Years
The climate in Reykjavik in August has not changed much over the last 43 years.
The average temperature was the lowest in 1979 (+5°C) and the highest in 2003 (+9°C). The driest year was 2019 with only 289 mm of rainfall, and the wettest year was 2003 with 1379 mm.
FAQ
Is August a good time to visit Reykjavik?
Can you sunbathe in Reykjavik in August?
Can you swim in Reykjavik in August?
Is Reykjavik rainy in August?
Is it sunny in Reykjavik in August?
Monthly weather in Reykjavik
Source of the data
For this page, we’ve looked at the typical weather in Reykjavik, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.