Lilla Holmen Beach Sea Temperature & Swim Forecast
Family beach in central Mariehamn.
Cool water with a light chop and a light breeze — fresh conditions — a wetsuit is recommended.
Location
Lilla Holmen 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 15.6°C you need a 4/3mm fullsuit, and many surfers add neoprene boots.
- + Optional 3mm boots
Recommendation tuned for Lilla Holmen Beach's current water temperature. Individual tolerance, wind chill, and session length all matter — when in doubt, size up.
Can I swim at Lilla Holmen Beach today?
The sea is currently 15.6°C — fair swimming conditions. Acclimatised swimmers will be most comfortable.
- • Located in Aland Islands, Finland (Baltic 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 Lilla Holmen Beach
The sea in Lilla Holmen Beach peaks in August, when the water averages around 17°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 6°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.
Lilla Holmen Beach sea temperature history
Long-term climatology for Lilla Holmen Beach shows an annual mean sea temperature of 9°C, ranging from 3°C in winter to 17°C at the summer peak.
The seasonal swing is roughly 14°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 Lilla Holmen 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.
Lilla Holmen Beach sea temperature: frequently asked questions
What is the warmest month to swim in Lilla Holmen Beach?
August is the warmest month in Lilla Holmen Beach, when the sea averages about 17°C. Late-season warmth often persists a few weeks after peak.
When is the sea coldest in Lilla Holmen Beach?
The coldest month in Lilla Holmen Beach is typically February, when the water averages around 3°C. Cold-water swimmers and surfers dominate this period.
When can you swim in Lilla Holmen Beach without a wetsuit?
The sea in Lilla Holmen 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 Lilla Holmen Beach?
Outside peak summer the water in Lilla Holmen Beach drops toward 6°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 Lilla Holmen Beach?
The long-term annual mean sea temperature in Lilla Holmen Beach is about 9°C, based on multi-decadal climatology of the surrounding waters.
How do I check the current sea temperature in Lilla Holmen Beach?
The live reading at the top of this page shows the current sea temperature in Lilla Holmen 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 | 16°C | Bracing |
| Aug ⭐ | 17°C | Bracing |
| Sep | 15°C | Bracing |
| Oct | 11°C | Cold |
| Nov | 7°C | Cold |
| Dec | 5°C | Cold |
Nearby beaches
The closest coastline, with live water temperatures.