Hietaniemi Water Temperature & Swim Forecast
Helsinki's main summer city beach.
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Location
Hietaniemi on the map, with nearby beaches and live sea temperatures.
7-day forecast
Water, air, waves, wind and UV outlook for the week ahead.
Check live temperature
Live water temperature is loading — refresh in a moment for a precise recommendation.
Recommendation tuned for Hietaniemi's current water temperature. Individual tolerance, wind chill, and session length all matter — when in doubt, size up.
Hietaniemi swimming conditions summary
- Water temperature
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- Water feels
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- Swimmable today
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- Swim conditions score
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- Wetsuit needed
- Check live temperature
- Air temperature
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- Waves
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- Wind
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- UV index
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- Warmest months to swim
- July, August, September
Live water temperature is loading — refresh in a moment for a precise recommendation. Live marine data updated hourly from Open-Meteo Marine.
Frequently asked questions
Can I swim at Hietaniemi right now?
Live data is loading. Use the 7-day forecast above to plan your swim — conditions above 22°C are comfortable for most swimmers.
What will the sea temperature be at Hietaniemi next week?
Based on long-term August averages and the latest marine model, expect the sea around Hietaniemi to sit close to 17.0°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 Hietaniemi?
July – August – September are typically the warmest months to swim at Hietaniemi, with sea temperatures at their seasonal peak.
Can I swim at Hietaniemi today?
Live data is loading. In summer, this beach typically offers comfortable swimming conditions.
- • Located in Finnish Coast, 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 Hietaniemi
The sea in Hietaniemi 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.
Hietaniemi sea temperature history
Long-term climatology for Hietaniemi 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 Hietaniemi, 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.
Hietaniemi sea temperature: frequently asked questions
What is the warmest month to swim in Hietaniemi?
August is the warmest month in Hietaniemi, when the sea averages about 17°C. Late-season warmth often persists a few weeks after peak.
When is the sea coldest in Hietaniemi?
The coldest month in Hietaniemi is typically February, when the water averages around 3°C. Cold-water swimmers and surfers dominate this period.
When can you swim in Hietaniemi without a wetsuit?
The sea in Hietaniemi 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 Hietaniemi?
Outside peak summer the water in Hietaniemi 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 Hietaniemi?
The long-term annual mean sea temperature in Hietaniemi is about 9°C, based on multi-decadal climatology of the surrounding waters.
How do I check the current sea temperature in Hietaniemi?
The live reading at the top of this page shows the current sea temperature in Hietaniemi, 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.