Grímsey Temperature by Month
The average annual maximum temperature in Grímsey, North Iceland, Iceland is 6°C (43°F), with daytime highs ranging from 3°C (37°F) in March to 11°C (52°F) in August. This page covers monthly averages, day-night differences, and how Grímsey compares to cities worldwide.
Grímsey Monthly Temperatures
The moderate changes in the climate in Grímsey ensure gradual weather shifts through each season. At night, temperatures drop to between 8°C (46°F) and -1°C (30°F) depending on the time of year.
The chart below illustrates the average maximum day and minimum night temperatures in Grímsey by month:
Low temperatures are most often recorded between 4 AM and 6 AM, while highs typically occur around 3 PM.
The chart below shows the average temperature throughout the year:
Temperature: Grímsey vs Iceland
The map below shows the annual temperature across Iceland. You can also select individual months if you want to compare a specific time of year.
very warm
warm
pleasant
moderate
cold
very cold
Grímsey vs World: Temperature Compared
Grímsey's average annual maximum temperature is 6°C (43°F). To put that in context, here's how it compares to a few well-known destinations:
Rome, Italy averages 20°C (68°F) annually, with reliably warm summers and comfortable winters.
Queenstown, New Zealand averages 10°C (50°F) annually — remember seasons are flipped, so its coldest months fall in June and July.
Chicago, USA averages 15°C (59°F) annually — known for extreme seasonal swings, from bitterly cold winters to warm summers.
Tokyo, Japan averages 21°C (70°F) a year, with hot summers, cool winters, and a well-defined cherry blossom spring.
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.
For cities and regions with significant elevation, altitude is one of the biggest factors shaping local temperatures. As a rule of thumb, temperatures fall by around 6°C for every 1,000 metres gained — so a city at 2,000 metres will typically be around 12°C cooler than a city at sea level in the same region. Higher ground also tends to see more dramatic day-to-night temperature swings, since thinner air loses heat faster after sunset.
For more on Grímsey's weather — including monthly rainfall, sunshine hours, and humidity — visit our Grímsey climate page.
