Rostojávri — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Rostojávri, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Rostojávri today is 10.9°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
❌ As of today, the minimum water temperature ranges from 50°F (10°C) to 54°F (12°C). The water is slightly warmer, but still cool for most people. Swimming in such conditions is possible, but for most people, the time spent in the water should be limited to avoid hypothermia. Even experienced swimmers may feel discomfort if they stay in the water for too long. To improve comfort and safety, a wetsuit 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 |
|---|---|---|---|
| AUG 3 | 11.9°C | 12.0°C | |
| AUG 4 | 11.7°C | 12.0°C | |
| AUG 5 | 11.7°C | 12.0°C | |
| AUG 6 | 11.3°C | 12.0°C | |
| AUG 7 | 11.3°C | 12.0°C | |
| AUG 8 | 11.2°C | 12.0°C | |
| AUG 9 | 10.9°C | 12.0°C | |
| AUG 10 | 10.9°C | 12.0°C | |
| AUG 11 | 12.0°C | 11.0°C | |
| AUG 12 | 12.0°C | 11.0°C | |
| AUG 13 | 12.0°C | 11.1°C | |
| AUG 14 | 12.0°C | 11.1°C | |
| AUG 15 | 12.0°C | 11.2°C | |
| AUG 16 | 12.0°C | 11.2°C | |
| AUG 17 | 12.0°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 | 2°C | 0°C |
| February | 0°C | 2°C | 0°C |
| March | 0°C | 2°C | 0°C |
| April | 0°C | 2°C | 2°C |
| May | 0°C | 2°C | 5°C |
| June | 0°C | 5°C | 10°C |
| July | 4°C | 9°C | 14°C |
| August | 7°C | 12°C | 18°C |
| September | 4°C | 9°C | 14°C |
| October | 0°C | 4°C | 7°C |
| November | 0°C | 2°C | 2°C |
| December | 0°C | 2°C | 0°C |
Rostojávri: Water Temperature by Location
Rostojávri: Weather Forecast
August 11
August 12
August 13
August 14
Location & Local Information
Rostojávri in Troms County is a northern Norwegian lake with typically cold water temperatures that reflect its high latitude and seasonal ice cover. In spring and early summer surface temperatures are often low, roughly 1–8 °C (34–46 °F), as snowmelt and cold inflows keep the water chilly. Peak summer warmth is modest compared with more southerly lakes, commonly ranging from about 8–15 °C (46–59 °F) on warm days, while autumn sees a decline toward roughly 4–10 °C (39–50 °F). During winter the lake usually freezes or is close to freezing, with water temperatures at or just above 0 °C (32 °F) beneath any ice, so open-water conditions are rare until thaw.
Swimming in Rostojávri is generally possible in summer when the water reaches its warmest, but it remains cold by many swimmers’ standards and carries risks. Norway’s public access traditions mean recreational swimming is not prohibited in most places, yet ice cover in winter makes the lake inaccessible and dangerous then. Cold-shock response and rapid hypothermia are the main hazards, so cautious swimmers use wetsuits or drysuits, short stays in the water, and a companion on shore. Local conditions—wind, currents, and remoteness—should be assessed before entering, and those unfamiliar with cold-water swimming should avoid solo attempts.