Lake Arresø — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Lake Arresø, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Lake Arresø today is 19.3°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 | 17.7°C | 20.0°C | |
| JUN 24 | 17.7°C | 20.0°C | |
| JUN 25 | 17.8°C | 20.0°C | |
| JUN 26 | 18.3°C | 20.0°C | |
| JUN 27 | 18.3°C | 20.0°C | |
| JUN 28 | 18.9°C | 20.0°C | |
| JUN 29 | 18.9°C | 20.0°C | |
| JUN 30 | 19.3°C | 20.0°C | |
| JUL 1 | 20.0°C | 19.3°C | |
| JUL 2 | 20.0°C | 19.4°C | |
| JUL 3 | 20.0°C | 19.4°C | |
| JUL 4 | 20.0°C | 19.4°C | |
| JUL 5 | 20.0°C | 19.5°C | |
| JUL 6 | 20.0°C | 19.5°C | |
| JUL 7 | 20.0°C | 19.5°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 | 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 |
Lake Arresø: Water Temperature by Location
Lake Arresø: Weather Forecast
July 1
July 2
July 3
July 4
July 5
Location & Local Information
Arresø (Danish: Arresø) is the largest lake in Region Zealand and its water temperature follows the temperate Danish climate. In spring the surface typically warms from about 4–12 °C (39–54 °F) as air temperatures rise and ice, if present, melts. Summer is the warmest period, with common surface temperatures of 17–24 °C (63–75 °F) and occasional short-lived peaks approaching the mid-20s °C (mid-70s °F) during heatwaves. In autumn the lake cools again to roughly 8–15 °C (46–59 °F) and in winter surface temperatures are often close to freezing, around 0–4 °C (32–39 °F), with parts of the lake sometimes ice-covered in cold spells.
Swimming in Arresø is generally possible and practiced, particularly at designated bathing spots and accessible shores during the warmer months when temperatures are comfortable. Local authorities monitor bathing water quality and will advise against swimming if cyanobacterial blooms, pollution or heavy runoff have degraded conditions, so checking signage or municipal updates is recommended before entering the water. Be mindful that colder shoulder seasons carry risks of cold-water shock and reduced buoyancy; using appropriate clothing, supervising children and avoiding solitary swims improve safety.