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 6.5°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
❌ As of today, the minimum water temperature ranges from 41°F (5°C) to 47°F (8°C). This water temperature is still quite low, and swimming in such conditions may only be comfortable for hardened individuals. It is recommended to limit the time spent in the water to avoid hypothermia. For those not accustomed to cold water, it is better to refrain from swimming. However, if you decide to enter the water, it is advisable to wear a warm wetsuit for protection against the cold. 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 |
|---|---|---|---|
| JUN 3 | 5.3°C | 4.0°C | |
| JUN 4 | 5.3°C | 4.0°C | |
| JUN 5 | 5.7°C | 4.0°C | |
| JUN 6 | 5.8°C | 4.0°C | |
| JUN 7 | 7.1°C | 4.0°C | |
| JUN 8 | 7.1°C | 4.0°C | |
| JUN 10 | 6.5°C | 4.0°C | |
| JUN 11 | 4.0°C | 6.4°C | |
| JUN 12 | 4.0°C | 6.3°C | |
| JUN 13 | 4.0°C | 6.1°C | |
| JUN 14 | 4.0°C | 6.0°C | |
| JUN 15 | 4.0°C | 5.9°C | |
| JUN 16 | 4.0°C | 5.8°C | |
| JUN 17 | 4.0°C | 5.6°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 | 4°C | 9°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
June 9
June 10
June 11
June 12
June 13
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.