Glomma River — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in the Glomma River, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in the Glomma River today is 9.8°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 | 11.3°C | 14.0°C | |
| SEP 14 | 11.1°C | 14.0°C | |
| SEP 15 | 11.0°C | 14.0°C | |
| SEP 16 | 10.8°C | 14.0°C | |
| SEP 17 | 10.7°C | 14.0°C | |
| SEP 18 | 10.4°C | 14.0°C | |
| SEP 19 | 10.4°C | 14.0°C | |
| SEP 20 | 10.1°C | 14.0°C | |
| SEP 21 | 14.0°C | 10.0°C | |
| SEP 22 | 14.0°C | 10.2°C | |
| SEP 23 | 14.0°C | 10.4°C | |
| SEP 24 | 14.0°C | 10.6°C | |
| SEP 25 | 14.0°C | 10.9°C | |
| SEP 26 | 14.0°C | 11.1°C | |
| SEP 27 | 14.0°C | 11.3°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 |
Glomma River: Water Temperature by Location
Glomma River: Weather Forecast
September 21
September 22
September 23
September 24
September 25
September 26
Location & Local Information
Source Aursunden
• location Røros Municipality, Trøndelag, Norway
• coordinates 62°37′06″N 11°48′11″E
• elevation 690 m (2,260 ft)
Mouth Fredrikstad
• location Fredrikstad Municipality, Østfold, Norway
• coordinates 59°13′04″N 10°55′51″E
• elevation 0 m (0 ft)
Length 621 km (386 mi)
Glomma, Norway’s longest river, passes through parts of Trøndelag and exhibits marked seasonal changes in water temperature. In winter the river surface is often close to freezing, typically around 0–4 °C (32–39 °F) where ice or slush may form. Spring melt and runoff raise temperatures but the water generally remains cool, roughly 2–10 °C (36–50 °F). By summer, surface temperatures in sheltered or shallow sections can reach about 10–18 °C (50–64 °F), while deeper, faster stretches stay cooler. During autumn the river usually cools again to roughly 6–12 °C (43–54 °F) as air temperatures fall and flows increase.
Swimming in Glomma is possible in many places but not universally recommended without local knowledge and caution. There are no blanket bans across the whole river, so recreational swimming is allowed where shore access, calmer backwaters or designated spots exist, but strong currents, variable depth, boat traffic and regulated discharges from upstream dams can create hazardous conditions. Water quality is generally good in Trøndelag but can vary with runoff and local sources, and ice makes winter swimming unsafe except for organised cold-water bathing with precautions. Anyone choosing to swim should heed local signs, be aware of cold-water shock and currents, and avoid entering the river alone.