Lake
Hemmoor, Heidestrandbad
Water temperature at Hemmoor, Heidestrandbad is approximately 13.4C. Source: Open-Meteo 2m air temperature (92-day history + 7-day forecast), updated daily. Model accuracy: +/-2C.
Last updated:
Right Now
13.4°C
Data Source
Lake Thermal (France-calibrated)
Lake surface temperature estimated using the Prats & Danis (2019) exponential smoothing model. Captures thermal inertia — lakes respond slowly to air temperature changes. Parameters computed from published equations using actual latitude and altitude (Copernicus DEM), with default assumptions for depth and size.
View research paper7-Day Trend
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Report temperatureFrequently asked questions
What temperature is safe for wild swimming?
Most swimmers find 15°C+ comfortable. Below 10°C requires careful acclimatisation and you should limit your time in the water. Cold water shock can occur at any temperature below around 15°C, so always enter slowly.
How accurate is the temperature data?
It depends on the water body type. For ocean spots we use satellite sea surface temperature. For rivers and lakes, temperature is estimated from air temperature using published regression models. Accuracy varies by model (typically ±2-3°C). Community reports from swimmers who have been in the water recently are the most accurate local source.
Why does the temperature vary between models?
River and lake models use different equations calibrated on different datasets and regions. The Linear model is simpler and reliable in mid-range conditions. The Logistic model handles temperature extremes better. The Thermal model for lakes accounts for how lakes hold heat over time. Choose the one that best matches your location, or compare both.