Hønefoss — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Hønefoss, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Hønefoss today is 3.6°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 | 3.2°C | 5.0°C | |
| APR 12 | 3.3°C | 5.0°C | |
| APR 13 | 3.3°C | 5.0°C | |
| APR 14 | 3.3°C | 5.0°C | |
| APR 15 | 3.3°C | 5.0°C | |
| APR 16 | 3.6°C | 5.0°C | |
| APR 17 | 3.6°C | 5.0°C | |
| APR 18 | 3.6°C | 5.0°C | |
| APR 19 | 5.0°C | 3.7°C | |
| APR 20 | 5.0°C | 3.7°C | |
| APR 21 | 5.0°C | 3.8°C | |
| APR 22 | 5.0°C | 3.9°C | |
| APR 23 | 5.0°C | 4.0°C | |
| APR 24 | 5.0°C | 4.0°C | |
| APR 25 | 5.0°C | 4.1°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 | 2°C | 5°C |
| February | 0°C | 2°C | 5°C |
| March | 0°C | 3°C | 6°C |
| April | 1°C | 5°C | 8°C |
| May | 6°C | 11°C | 16°C |
| June | 12°C | 17°C | 22°C |
| July | 13°C | 18°C | 23°C |
| August | 14°C | 19°C | 24°C |
| September | 11°C | 16°C | 21°C |
| October | 5°C | 9°C | 12°C |
| November | 1°C | 5°C | 8°C |
| December | 0°C | 3°C | 6°C |
Hønefoss: Weather Forecast
April 19
April 20
April 21
April 22
Location & Local Information
Hønefoss, located by inland waters such as Tyrifjorden and the Begna and nearby rivers, experiences a clear seasonal pattern in freshwater temperatures. In summer, surface temperatures in lakes typically range from about 15–22 °C (59–72 °F), with occasional warm periods reaching 24–25 °C (75–77 °F). Rivers tend to be cooler, commonly 8–18 °C (46–64 °F) in the warm months, depending on flow and shading. Spring and early summer see a rapid rise from near-freezing conditions in late winter—lakes and slow-moving stretches often 0–4 °C (32–39 °F) under ice or during thaw, spring values around 2–10 °C (36–50 °F), and autumn cooling back toward single digits before freezing again.
Swimming in Hønefoss’s lakes and calmer river sections is generally allowed and popular in summer, with designated bathing sites and informal spots used by residents. Authorities and locals emphasize safety: rivers can have strong currents, colder deep water, and sudden temperature changes that increase risk of cold shock, while water quality can vary (occasional algal blooms or runoff issues may lead to temporary advisories). Winter ice swimming and bathing are practiced by some but require experienced supervision, tested ice, and awareness of hypothermia risks.