De Haan Water Temperature & Swim Forecast
Belle-époque seaside village beach.
Cold water with a light chop and a light breeze — tough conditions for unprotected swimming.
Model estimate · modelled, not a buoy measurement. How accurate is this?
Location
De Haan on the map, with nearby beaches and live sea temperatures.
7-day forecast
Water, air, waves, wind and UV outlook for the week ahead.
5/4mm fullsuit + boots & gloves
At 10.9°C you need a 5/4mm fullsuit with boots, gloves and ideally a hood.
- + 5mm boots
- + 3mm gloves
- + Hood for extended sessions
Recommendation tuned for De Haan's current water temperature. Individual tolerance, wind chill, and session length all matter — when in doubt, size up.
De Haan swimming conditions summary
- Water temperature
- 10.9°C
- Water feels
- Bracing
- Swimmable today
- Only with thermal protection
- Swim conditions score
- 42/100 · Poor
- Wetsuit needed
- 5/4mm fullsuit + boots & gloves
- Air temperature
- —
- Waves
- —
- Wind
- —
- UV index
- —
- Average sea temperature (November)
- 11.0 °C
- Warmest months to swim
- July, August, September
At 10.9°C you need a 5/4mm fullsuit with boots, gloves and ideally a hood. 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 De Haan right now?
The sea at De Haan is currently 10.9°C — very 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 De Haan next week?
Based on long-term November averages and the latest marine model, expect the sea around De Haan to sit close to 11.0°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 De Haan?
July – August – September are typically the warmest months to swim at De Haan, with sea temperatures at their seasonal peak.
Do I need a wetsuit at De Haan?
With water currently at 10.9°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 De Haan today?
The sea is currently 10.9°C — poor swimming conditions. Acclimatised swimmers will be most comfortable.
- • Located in Flemish Coast, Belgium (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 De Haan
The sea in De Haan peaks in August, when the water averages around 19°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 9°C, so a 3/2mm shorty or full wetsuit makes long swims much more comfortable.
The coldest month is typically February at around 7°C, when cold-water swimmers dominate the coast.
De Haan sea temperature history
Long-term climatology for De Haan shows an annual mean sea temperature of 13°C, ranging from 7°C in winter to 19°C at the summer peak.
The seasonal swing is roughly 12°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 De Haan, 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.
De Haan sea temperature: frequently asked questions
What is the warmest month to swim in De Haan?
August is the warmest month in De Haan, when the sea averages about 19°C. Late-season warmth often persists a few weeks after peak.
When is the sea coldest in De Haan?
The coldest month in De Haan is typically February, when the water averages around 7°C. Cold-water swimmers and surfers dominate this period.
When can you swim in De Haan without a wetsuit?
The sea in De Haan 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 De Haan?
Outside peak summer the water in De Haan drops toward 9°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 De Haan?
The long-term annual mean sea temperature in De Haan is about 13°C, based on multi-decadal climatology of the surrounding waters.
How do I check the current sea temperature in De Haan?
The live reading at the top of this page shows the current sea temperature in De Haan, 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 | 8°C | Cold |
| Feb | 7°C | Cold |
| Mar | 8°C | Cold |
| Apr | 10°C | Cold |
| May | 13°C | Cold |
| Jun | 16°C | Bracing |
| Jul | 18°C | Pleasant |
| Aug ⭐ | 19°C | Pleasant |
| Sep | 17°C | Bracing |
| Oct | 14°C | Bracing |
| Nov | 11°C | Cold |
| Dec | 9°C | Cold |
Nearby beaches
The closest coastline, with live water temperatures.