Björnö Beach — Sea temperature now
Scandinavian summer swimming beach near Ingarö.
Fresh water with a light chop and a light breeze — fresh conditions — a wetsuit is recommended.
Location
Björnö 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 Björnö Beach
The sea in Björnö 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 6°C, so a 3/2mm shorty or full wetsuit makes long swims much more comfortable.
The coldest month is typically February at around 2°C, when cold-water swimmers dominate the coast.
Björnö Beach sea temperature history
Long-term climatology for Björnö Beach shows an annual mean sea temperature of 9°C, ranging from 2°C in winter to 18°C at the summer peak.
The seasonal swing is roughly 16°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 Björnö 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.
Björnö Beach sea temperature: frequently asked questions
What is the warmest month to swim in Björnö Beach?
August is the warmest month in Björnö Beach, when the sea averages about 18°C. Late-season warmth often persists a few weeks after peak.
When is the sea coldest in Björnö Beach?
The coldest month in Björnö Beach is typically February, when the water averages around 2°C. Cold-water swimmers and surfers dominate this period.
When can you swim in Björnö Beach without a wetsuit?
The sea in Björnö 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 Björnö Beach?
Outside peak summer the water in Björnö 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 Björnö Beach?
The long-term annual mean sea temperature in Björnö Beach is about 9°C, based on multi-decadal climatology of the surrounding waters.
How do I check the current sea temperature in Björnö Beach?
The live reading at the top of this page shows the current sea temperature in Björnö 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 | 3°C | Cold |
| Feb | 2°C | Cold |
| Mar | 2°C | Cold |
| Apr | 4°C | Cold |
| May | 8°C | Cold |
| Jun | 13°C | Cold |
| Jul | 17°C | Bracing |
| Aug ⭐ | 18°C | Pleasant |
| Sep | 15°C | Bracing |
| Oct | 11°C | Cold |
| Nov | 7°C | Cold |
| Dec | 5°C | Cold |