Hallingdalselva River — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in the Hallingdalselva River, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in the Hallingdalselva River today is 10°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
❌ As of today, the minimum water temperature ranges from 47°F (8°C) to 50°F (10°C). This is still cool water, suitable only for experienced swimmers or those accustomed to cold water. Swimming in such conditions is possible, but not recommended for prolonged periods. Extra caution should be taken during extended exposure, as the cold water can cause heat loss and lead to hypothermia. For added comfort, special clothing can be used. 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 |
|---|---|---|---|
| SEP 13 | 10.8°C | 14.0°C | |
| SEP 14 | 11.2°C | 14.0°C | |
| SEP 15 | 11.1°C | 14.0°C | |
| SEP 16 | 11.0°C | 14.0°C | |
| SEP 17 | 10.9°C | 14.0°C | |
| SEP 18 | 11.0°C | 14.0°C | |
| SEP 19 | 10.4°C | 14.0°C | |
| SEP 20 | 9.8°C | 14.0°C | |
| SEP 21 | 14.0°C | 10.2°C | |
| SEP 22 | 14.0°C | 10.4°C | |
| SEP 23 | 14.0°C | 10.6°C | |
| SEP 24 | 14.0°C | 10.8°C | |
| SEP 25 | 14.0°C | 11.0°C | |
| SEP 26 | 14.0°C | 11.2°C | |
| SEP 27 | 14.0°C | 11.4°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 | 1°C | 4°C |
| February | 0°C | 1°C | 4°C |
| March | 0°C | 2°C | 5°C |
| April | 0°C | 4°C | 7°C |
| May | 5°C | 9°C | 14°C |
| June | 9°C | 14°C | 19°C |
| July | 11°C | 16°C | 20°C |
| August | 12°C | 17°C | 21°C |
| September | 9°C | 14°C | 18°C |
| October | 4°C | 8°C | 10°C |
| November | 0°C | 4°C | 7°C |
| December | 0°C | 2°C | 5°C |
Hallingdalselva River: Water Temperature by Location
Hallingdalselva River: Weather Forecast
September 21
September 22
September 23
September 24
September 25
September 26
Location & Local Information
Hallingdalselva in Buskerud (Hallingdal) shows pronounced seasonal variation in water temperature because it is fed by mountain runoff and regulated stretches. During spring snowmelt (roughly March–May) temperatures are low, commonly around 0–8 °C (32–46 °F). Early summer (June) typically warms to about 8–15 °C (46–59 °F), while the warmest months, July–August, can see sheltered, slow-moving areas reach roughly 12–20 °C (54–68 °F) on sunny years. By autumn temperatures fall back toward 6–12 °C (43–54 °F), and in winter many stretches approach freezing, about 0–4 °C (32–39 °F), with ice forming in calmer sections.
Swimming in Hallingdalselva is generally possible and commonly practised in calmer, accessible reaches during the warmest weeks, because Norwegian outdoor access traditions and public sites make river bathing feasible. However, not all parts are suitable or safe: strong currents, cold shock from meltwater, sudden flow changes from hydropower releases, and rapid deepening at some banks mean swimmers must choose spots carefully. Some areas near dams, intakes or private installations can be restricted. Water quality is often good in rural Hallingdal, but local conditions should be checked and standard precautions taken — enter slowly, avoid solitary swims in fast-flowing stretches, and heed local signage.