Grindavík Temperature by Month

Grindavík in Reykjanes, Iceland sees moderate seasonal temperature shifts, with daytime highs between 5°C (41°F) in February and 14°C (57°F) in July, averaging 9°C (48°F) annually. Explore the full monthly breakdown below.

The climate in Grindavík experiences moderate temperature changes, with mild shifts between seasons. At night, temperatures range from 10°C (50°F) in July to 0°C (32°F) in February.

The chart below illustrates the average maximum day and minimum night temperatures in Grindavík by month:

Daily lows are most common between 4 AM and 6 AM. By 3 PM temperatures reach their daily high, driven by peak solar heating. July, the warmest month of the year, receives 168 hours of sunshine.

The chart below shows the average temperature throughout the year:

Grindavík's average annual maximum temperature is 9°C (48°F). To put that in context, here's how it compares to a few well-known destinations:

Lisbon, Portugal averages 21°C (70°F) annually, warm summers, mild winters, and rain mainly in the cooler months.

Interlaken, Switzerland averages 8°C (46°F) a year, with cold winters and cool summers thanks to its Alpine setting.

Buenos Aires, Argentina averages 23°C (73°F) a year, with hot summers and mild winters, and seasons reversed compared to Europe.

Perth, Australia averages 25°C (77°F) annually, with a classic Mediterranean climate, hot dry summers and mild wet winters.

Temperature alone doesn't tell the whole story, humidity plays a big role in how warm or cold it actually feels. High humidity in summer makes the heat feel more intense, particularly once temperatures climb above 25°C. In winter, the same humidity can make cold air feel sharper than the thermometer suggests.

In the cooler months, when temperatures drop below 10°C, high humidity makes the cold feel more cutting than it would in dry conditions.

In Grindavík, February is the coolest month, with average highs of 5°C (41°F) and humidity around 79%, considered high. For a full picture, see our humidity page.

Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.

The readings come from a range of sources, land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.

Seasonal temperature shifts influence more than just how warm it feels, they also drive changes in rainfall, cloud cover, and wind patterns throughout the year.

Warmer air holds more moisture, which tends to mean heavier or more frequent rain during the warmer months. When temperatures drop in winter, any precipitation that does fall is more likely to come as snow or sleet, though in Grindavík this rarely lasts long on the ground.

For more on Grindavík's weather, including monthly rainfall, sunshine hours, and humidity, visit our Grindavík climate page.