Grenen Beach — Sea temperature now
North Jutland family beach.
Fresh water with a light chop and a light breeze — fresh conditions — a wetsuit is recommended.
Location
Grenen Beach on the map, with nearby beaches and live sea temperatures.
7-day forecast
Water, air, waves, wind and UV outlook for the week ahead.
Monthly sea temperature averages
Typical year-round water temperature, based on regional climatology.
Best time to swim in Grenen Beach
The sea in Grenen Beach peaks in August, when the water averages around 18°C.
On average, 0 months a year sit above 20°C — the threshold most swimmers describe as pleasant without a wetsuit.
Outside peak season the water drops toward 7°C, so a 3/2mm shorty or full wetsuit makes long swims much more comfortable.
The coldest month is typically February at around 3°C, when cold-water swimmers dominate the coast.
Grenen Beach sea temperature history
Long-term climatology for Grenen Beach shows an annual mean sea temperature of 10°C, ranging from 3°C in winter to 18°C at the summer peak.
The seasonal swing is roughly 15°C between the coldest and warmest month — a useful yardstick when comparing years or checking whether the current sea is running above or below average.
Recent decades have trended slightly warmer at Grenen Beach, in line with regional sea-surface temperature records for the wider basin.
Monthly averages below are drawn from multi-decadal climatology and are updated as new observations arrive.
Grenen Beach sea temperature: frequently asked questions
What is the warmest month to swim in Grenen Beach?
August is the warmest month in Grenen Beach, when the sea averages about 18°C. Late-season warmth often persists a few weeks after peak.
When is the sea coldest in Grenen Beach?
The coldest month in Grenen Beach is typically February, when the water averages around 3°C. Cold-water swimmers and surfers dominate this period.
When can you swim in Grenen Beach without a wetsuit?
The sea in Grenen Beach rarely climbs above 20°C, so a wetsuit is recommended year-round for anything longer than a quick dip.
Do I need a wetsuit in Grenen Beach?
Outside peak summer the water in Grenen Beach drops toward 7°C, so a 3/2mm shorty or full wetsuit makes long swims much more comfortable. In peak months most swimmers go without.
What is the average sea temperature in Grenen Beach?
The long-term annual mean sea temperature in Grenen Beach is about 10°C, based on multi-decadal climatology of the surrounding waters.
How do I check the current sea temperature in Grenen Beach?
The live reading at the top of this page shows the current sea temperature in Grenen Beach, updated hourly from marine buoy and satellite data. The 7-day forecast covers water, air, waves, wind and UV for the week ahead.
Year-round sea temperature
| Month | Sea | Comfort |
|---|---|---|
| Jan | 4°C | Cold |
| Feb | 3°C | Cold |
| Mar | 3°C | Cold |
| Apr | 5°C | Cold |
| May | 9°C | Cold |
| Jun | 13°C | Cold |
| Jul | 17°C | Bracing |
| Aug ⭐ | 18°C | Pleasant |
| Sep | 16°C | Bracing |
| Oct | 12°C | Cold |
| Nov | 8°C | Cold |
| Dec | 6°C | Cold |