Katwijk aan Zee — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Katwijk aan Zee, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Katwijk aan Zee today is 21.7°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature ranges from 68°F (20°C) to 74°F (23°C). The water is warm and pleasant for swimming, and in this range, one can stay in the water for extended periods without the risk of hypothermia. This is the ideal temperature for relaxation, swimming, and water sports. Families with children, as well as outdoor enthusiasts, will enjoy swimming and time spent in the water. For most people, this is the optimal temperature for a comfortable beach experience. 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.
Water Temperature Chart Over the Last 30 Days
Table of Daily Sea Temperature Data
| Date | Current | Average | Forecast |
|---|---|---|---|
| AUG 4 | 21.8°C | 19.1°C | |
| AUG 5 | 21.8°C | 19.1°C | |
| AUG 6 | 21.7°C | 19.1°C | |
| AUG 7 | 21.7°C | 19.1°C | |
| AUG 8 | 21.7°C | 19.1°C | |
| AUG 9 | 21.7°C | 19.1°C | |
| AUG 10 | 21.7°C | 19.1°C | |
| AUG 11 | 21.7°C | 19.1°C | |
| AUG 12 | 19.1°C | 21.6°C | |
| AUG 13 | 19.1°C | 21.4°C | |
| AUG 14 | 19.1°C | 21.3°C | |
| AUG 15 | 19.1°C | 21.2°C | |
| AUG 16 | 19.1°C | 21.1°C | |
| AUG 17 | 19.1°C | 20.9°C | |
| AUG 18 | 19.1°C | 20.8°C |
* Current - Actual water temperature value
** Average - Average water temperature on this day in recent years
*** Forecast - Our water temperature forecast
Actual nearshore water temperatures may fluctuate by several degrees from the reported values, especially following heavy rainfall or extended periods of strong winds. Certain wind patterns can cause colder, deeper waters to rise and replace the sun-warmed surface water, leading to noticeable variations.
Our forecast is based on a proprietary mathematical model that considers real-time water temperature changes, historical trends, key weather patterns, wind strength and direction, and air temperature specific to each region. Additionally, we incorporate data from other resorts to enhance accuracy.
Monthly Water Temperature Range (Min, Max & Average)
| Month | Min | Avg | Max |
|---|---|---|---|
| January | 3°C | 5°C | 7°C |
| February | 3°C | 4°C | 6°C |
| March | 3°C | 7°C | 10°C |
| April | 7°C | 10°C | 13°C |
| May | 12°C | 15°C | 18°C |
| June | 14°C | 17°C | 21°C |
| July | 17°C | 20°C | 25°C |
| August | 16°C | 19°C | 23°C |
| September | 14°C | 19°C | 23°C |
| October | 11°C | 14°C | 17°C |
| November | 6°C | 9°C | 12°C |
| December | 3°C | 5°C | 7°C |
Katwijk aan Zee: Weather Forecast
August 12
August 13
August 14
August 15
Location & Local Information
Katwijk aan Zee is a coastal town in the Netherlands, located on the Oude Rijn River, which flows into the North Sea. The Oude Rijn is primarily a tidal river, and its water temperature varies depending on the season and the influence of the North Sea. During the summer months, the river's temperature can reach around 18°C to 20°C (64°F to 68°F), which is generally suitable for swimming, though it may feel a bit chilly for some. In the winter, the water temperature drops significantly, often to around 4°C to 6°C (39°F to 43°F), making swimming very uncomfortable and potentially dangerous.
While Katwijk aan Zee is better known for its beautiful beaches along the North Sea, the Oude Rijn itself also offers areas where people may swim, especially in the warmer months. However, the river can be busy with boat traffic, and its waters can be affected by tides, so caution is needed. It’s important to check local safety regulations and ensure the water quality is safe for swimming before entering the river.