Hietanen Sea Water Temperature
A cool beach on the Archipelago Sea, warmest around August at about 17.7°C. Today's reading, 7-day forecast, and monthly averages below.
Hietanen water temperature
Wetsuit strongly recommended. Sudden entry may cause cold shock. Suitable only for brief, brisk plunges.
7-Day Water Temperature Forecast
Hietanen Monthly Water Temperature Averages
Historical monthly climatology. The warmest water in Hietanen occurs inJune, July, August, September — peaking at17.7°C (63.9°F) in August.
Year-Round Water Temperature Curve (°C / °F)
Hover a bar for detailsFull 12-month data table — min / avg / max & swimming comfort
| Month | Min Water Temp | Average Water Temp | Max Water Temp | Swimming Comfort |
|---|---|---|---|---|
| January | 0.1°C | 2.1°C | 5°C | Very Cold (< 16°C) |
| February | -0.6°C | 0.7°C | 3°C | Very Cold (< 16°C) |
| March | -1.3°C | 0.7°C | 2.8°C | Very Cold (< 16°C) |
| April | 0.3°C | 2.3°C | 3.9°C | Very Cold (< 16°C) |
| May | 2.7°C | 6.5°C | 14.5°C | Very Cold (< 16°C) |
| June | 7.4°C | 12.1°C | 16.9°C | Very Cold (< 16°C) |
| July | 13.5°C | 17.2°C | 23.3°C | Cool / Refreshing (16°C – 20°C) |
| August | 15.6°C | 17.7°C | 20.5°C | Cool / Refreshing (16°C – 20°C) |
| SeptemberCurrent | 11.5°C | 14.9°C | 18.6°C | Very Cold (< 16°C) |
| October | 8.7°C | 11.1°C | 15.4°C | Very Cold (< 16°C) |
| November | 3.7°C | 7.3°C | 9.7°C | Very Cold (< 16°C) |
| December | 0.2°C | 4.6°C | 6.9°C | Very Cold (< 16°C) |
Swimming FAQs for Hietanen
Is the sea warm enough to swim in Hietanen today?
Typical sea surface temperature in Hietanen this time of year is 14.9°C (58.8°F) — classified as Very Cold (< 16°C). Wetsuit strongly recommended. Sudden entry may cause cold shock. Suitable only for brief, brisk plunges. Live readings load automatically.
What are the warmest months for swimming in Hietanen?
The highest water temperatures in Hietanen typically occur duringJune, July, August, September, when monthly averages reach peak seasonal levels.
What is the typical water temperature in Hietanen in September?
Historically in September, water temperatures in Hietanen average around14.9°C (58.8°F), fluctuating between a recorded minimum of 11.5°C and a maximum of 18.6°C.