Climate of Iceland - Wikipedia
July 12.8 (55) 10.7 (51.3)
Weather in Iceland for Hikers | Adventures.com
The climate of Iceland is a mixture of tundra and subarctic conditions. The island is situated just south of the Arctic Circle, however, its climate is much milder than could be expected for its latitude and location. In fact, these mild temperatures are thanks to the Irminger Current, which is a branch of the North Atlantic Current, a warm current of water that travels north-west from the Caribbean to Iceland. In general, the weather in Iceland stays relatively constant all year round. There are cool summers and cool winters, but extreme temperatures are quite rare. The biggest variation in temperature is between the coastal areas and the highlands of Iceland. In the winter the average temperature is around 0 °C (32 °F) at the coast and −10 °C (14 °F) in the highlands. In the summer, both the coast and highlands experience average temperatures of around 10–13 °C (50–55 °F).
July is the warmest month in Iceland with an average temperature of 8°C to 14°C (46.4°F to 57.2°F). Some years the temperature can climb up to 18 to 20°C (64.4°F to 68°F). It’s also the second driest month, experiencing 10 days of precipitation, as well as the least windy month in Iceland.
July is also the first month when the days begin to get shorter at a rate of around 3 to 6 minutes a day. With an average of 19 hours and 47 minutes of daylight, it’s still the second brightest month of the year.