Hallevannet — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Hallevannet, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Hallevannet today is 3.9°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
❌ As of today, the minimum water temperature 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.
Water Temperature Chart Over the Last 30 Days
Table of Daily Sea Temperature Data
| Date | Current | Average | Forecast |
|---|---|---|---|
| APR 11 | 3.4°C | 7.0°C | |
| APR 12 | 3.7°C | 7.0°C | |
| APR 13 | 3.7°C | 7.0°C | |
| APR 14 | 3.7°C | 7.0°C | |
| APR 15 | 3.7°C | 7.0°C | |
| APR 16 | 3.9°C | 7.0°C | |
| APR 17 | 3.9°C | 7.0°C | |
| APR 18 | 3.9°C | 7.0°C | |
| APR 19 | 7.0°C | 4.1°C | |
| APR 20 | 7.0°C | 4.2°C | |
| APR 21 | 7.0°C | 4.4°C | |
| APR 22 | 7.0°C | 4.5°C | |
| APR 23 | 7.0°C | 4.7°C | |
| APR 24 | 7.0°C | 4.8°C | |
| APR 25 | 7.0°C | 5.0°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 | 3°C | 6°C |
| February | 0°C | 3°C | 6°C |
| March | 0°C | 4°C | 7°C |
| April | 3°C | 7°C | 11°C |
| May | 7°C | 12°C | 18°C |
| June | 13°C | 19°C | 24°C |
| July | 17°C | 22°C | 27°C |
| August | 17°C | 22°C | 27°C |
| September | 12°C | 18°C | 23°C |
| October | 7°C | 11°C | 14°C |
| November | 3°C | 7°C | 10°C |
| December | 0°C | 4°C | 7°C |
Hallevannet: Water Temperature by Location
Hallevannet: Weather Forecast
April 19
April 20
April 21
April 22
Location & Local Information
Hallevannet, a lake in Vestfold County, Norway, typically follows the temperature patterns of small southern Norwegian lakes. In winter the surface normally cools to around 0–4 °C (32–39 °F) and can freeze over some years. During spring temperatures rise from roughly 3–12 °C (37–54 °F) as the ice melts and the water stratifies. Summer water temperatures commonly range from about 12–22 °C (54–72 °F), with shallow bays occasionally reaching 23–25 °C (73–77 °F) in unusually warm spells. In autumn the lake cools again to roughly 6–14 °C (43–57 °F) as air temperatures fall and mixing increases.
Swimming in Hallevannet is generally allowed because Norway’s public right of access (allemannsretten) permits bathing in most natural waters, and local residents often use lakes for recreational swimming in summer. Whether it is suitable at any given time depends on water quality, weather and safety conditions; there are typically no lifeguards, and some shorelines may be steep or rocky. Early- and late-season swims carry a risk of cold shock when temperatures are low, so caution is advised. Visitors should observe local signage, avoid private property where restricted, and consider checking local water quality reports before swimming.