Grenen Beach Water Temperature & Swim Forecast
North Jutland family beach.
Cool water with a light chop and a light breeze — fresh conditions — a wetsuit is recommended.
Model estimate · modelled, not a buoy measurement. How accurate is this?
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.
4/3mm fullsuit
At 15.3°C you need a 4/3mm fullsuit, and many surfers add neoprene boots.
- + Optional 3mm boots
Recommendation tuned for Grenen Beach's current water temperature. Individual tolerance, wind chill, and session length all matter — when in doubt, size up.
Grenen Beach swimming conditions summary
- Water temperature
- 15.3°C
- Water feels
- Refreshing
- Swimmable today
- Only with thermal protection
- Swim conditions score
- 55/100 · Fair
- Wetsuit needed
- 4/3mm fullsuit
- Air temperature
- —
- Waves
- —
- Wind
- —
- UV index
- —
- Average sea temperature (September)
- 16.0 °C
- Warmest months to swim
- July, August, September
At 15.3°C you need a 4/3mm fullsuit, and many surfers add neoprene boots. Model estimate. Water, wave, wind and UV values are Open-Meteo marine/weather model estimates, refreshed hourly — not buoy measurements.
Frequently asked questions
Can I swim at Grenen Beach right now?
The sea at Grenen Beach is currently 15.3°C — cold swimming conditions. Most swimmers will find the water comfortable when it's above 22°C; below 18°C feels fresh and a wetsuit is recommended.
What will the sea temperature be at Grenen Beach next week?
Based on long-term September averages and the latest marine model, expect the sea around Grenen Beach to sit close to 13.1°C over the next 7 days. Check the live 7-day chart above for the exact daily outlook.
When is the best month to swim at Grenen Beach?
July – August – September are typically the warmest months to swim at Grenen Beach, with sea temperatures at their seasonal peak.
Do I need a wetsuit at Grenen Beach?
With water currently at 15.3°C: above 22°C no wetsuit needed; 18–22°C a shorty is comfortable for long swims; 14–18°C a 3/2mm full suit; below 14°C a 4/3mm or thicker.
Can I swim at Grenen Beach today?
The sea is currently 15.3°C — fair swimming conditions. Acclimatised swimmers will be most comfortable.
- • Located in North Jutland, Denmark (North Sea).
- • Family friendly with calm, accessible water.
- • Live data refreshed hourly from Open-Meteo Marine.
Monthly sea temperature averages
Tap any month to see what to expect — 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 |
Nearby beaches
The closest coastline, with live water temperatures.