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 18.5°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 65°F (18°C) to 68°F (20°C). This is already quite warm water, which is ideal for most people. Swimming becomes comfortable, and prolonged stays in the water do not cause discomfort. This temperature is perfect for family trips and for those who prefer warmer water. It is also comfortable for water sports such as surfing or swimming. 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 24 | 18.9°C | 19.7°C | |
| AUG 25 | 18.3°C | 19.7°C | |
| AUG 26 | 18.4°C | 19.7°C | |
| AUG 27 | 18.4°C | 19.7°C | |
| AUG 28 | 18.4°C | 19.7°C | |
| AUG 29 | 18.4°C | 19.7°C | |
| AUG 30 | 18.4°C | 19.7°C | |
| AUG 31 | 18.4°C | 19.7°C | |
| SEP 1 | 18.5°C | 18.5°C | |
| SEP 2 | 18.5°C | 18.5°C | |
| SEP 3 | 18.5°C | 18.5°C | |
| SEP 4 | 18.5°C | 18.5°C | |
| SEP 5 | 18.5°C | 18.5°C | |
| SEP 6 | 18.5°C | 18.5°C | |
| SEP 7 | 18.5°C | 18.5°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 | 20°C | 24°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
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September 4
September 5
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.