Isefjord Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Isefjord Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Isefjord Lake today is 19.7°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 |
|---|---|---|---|
| JUN 23 | 17.9°C | 20.0°C | |
| JUN 24 | 17.9°C | 20.0°C | |
| JUN 25 | 17.9°C | 20.0°C | |
| JUN 26 | 18.6°C | 20.0°C | |
| JUN 27 | 18.6°C | 20.0°C | |
| JUN 28 | 19.2°C | 20.0°C | |
| JUN 29 | 19.2°C | 20.0°C | |
| JUN 30 | 19.7°C | 20.0°C | |
| JUL 1 | 20.0°C | 19.7°C | |
| JUL 2 | 20.0°C | 19.7°C | |
| JUL 3 | 20.0°C | 19.7°C | |
| JUL 4 | 20.0°C | 19.8°C | |
| JUL 5 | 20.0°C | 19.8°C | |
| JUL 6 | 20.0°C | 19.8°C | |
| JUL 7 | 20.0°C | 19.8°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 | 0°C | 4°C | 7°C |
| February | 0°C | 3°C | 6°C |
| March | 2°C | 6°C | 9°C |
| April | 5°C | 9°C | 12°C |
| May | 9°C | 14°C | 20°C |
| June | 14°C | 20°C | 25°C |
| July | 14°C | 20°C | 25°C |
| August | 14°C | 20°C | 25°C |
| September | 11°C | 17°C | 22°C |
| October | 7°C | 11°C | 14°C |
| November | 5°C | 9°C | 12°C |
| December | 1°C | 5°C | 8°C |
Isefjord Lake: Water Temperature by Location
Isefjord Lake: Weather Forecast
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July 5
Location & Local Information
Isefjorden, a shallow, sheltered fjord on the island of Zealand in Denmark, shows clear seasonal variation in surface water temperature. In spring (March–May) temperatures typically rise from about 4–12 °C (39–54 °F) as the fjord responds to milder air. Summer (June–August) is the warmest period, with surface waters commonly between 15–20 °C (59–68 °F) and occasional localized peaks near 22 °C (72 °F) on warm, calm days. Autumn (September–November) brings cooling to roughly 8–14 °C (46–57 °F) while winter (December–February) often sees temperatures around 0–4 °C (32–39 °F), with colder spells that can produce near-freezing conditions in sheltered bays.
Swimming in Isefjorden is generally allowed and popular at designated beaches and piers; Danish coastal waters are public and many municipalities maintain bathing sites with water-quality monitoring. Authorities issue advisories if harmful algae blooms, pollution incidents, or unsafe conditions occur, so swimmers are encouraged to heed local signs. Practical considerations include variable currents, boat traffic near marinas, and the relatively cool shoulder-season temperatures that make wetsuits advisable outside high summer. Lifeguards are not always present, so basic safety precautions apply when entering the water.