North Sea Water Temperature Today & Regional Overview
We find every place where you can swim and show you the water temperature there today and throughout the year.
Current Water Temperature
The water temperature in the North Sea today ranges from 3.8°C (Simrishamn, Sweden) to 11.3°C (Willemstad, Netherlands).
As of today, the minimum water temperature in the North Sea ranges less than 41°F (5°C). Such water is extremely cold and not recommended for swimming without proper preparation. In these conditions, the risk of hypothermia is very high, and prolonged exposure to the water can be hazardous to your health. If you decide to swim, it is important to have the appropriate gear, such as a wetsuit. Typically, only experienced swimmers or those who practice winter swimming venture into such waters.
It is important to note that these swimming tips and recommendations apply only in good weather. When the air temperature is below 68°F (20°C), and sometimes even below 77°F (25°C), swimming can be unpleasant even with relatively high water temperatures.
Sea Temperature Trends
Over the past month, the water temperature in the North Sea has remained almost unchanged. In general, the sea water temperature remains within the statistical range for this time of year.
Water Temperature and Swimming Conditions Throughout the Year
| Month | Min | Max |
|---|---|---|
| January | -1°C | 11°C |
| February | -1°C | 11°C |
| March | -1°C | 10°C |
| April | 2°C | 12°C |
| May | 5°C | 17°C |
| June | 6°C | 21°C |
| July | 9°C | 23°C |
| August | 10°C | 22°C |
| September | 9°C | 22°C |
| October | 6°C | 19°C |
| November | 4°C | 17°C |
| December | 0°C | 14°C |
The North Sea’s water temperature varies substantially with season and location. In winter surface temperatures typically range from about 1°C in the northern reaches and near coasts of Norway and northern Scotland up to around 6–7°C in the southern North Sea and near continental coasts. Spring sees a warming trend with values roughly between 6°C and 12°C as sunlight increases and shallow coastal waters heat faster. Summer brings the warmest conditions, with broad sea-surface temperatures commonly between 12°C and 20°C: central and southern parts of the basin often reach the upper part of that range, while the far north and deeper areas remain cooler. During autumn temperatures fall again to roughly 8°C–14°C as the sea releases stored heat to the cooling atmosphere. Local factors such as depth, tidal mixing, and freshwater inflow produce important variations, so conditions at a particular beach can differ from the open-sea averages.
Swimming Conditions
Swimming in the North Sea is widely practiced and generally allowed at designated beaches and bathing spots, but not everywhere; harbours, shipping lanes and industrial zones are typically off-limits for safety reasons. The water is relatively cold compared with many tourist seas, so swimmers commonly use wetsuits outside the warmest weeks, and beach operators may post flags or close bathing areas when currents, waves, water quality or jellyfish present hazards. Lifeguarded beaches and official bathing sites are the safest options because they monitor conditions and provide emergency response. Anyone planning to swim should check local advisories, be aware of tides and currents, and respect posted restrictions and safety guidance.