Bollnäs — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Bollnäs, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Bollnäs today is 18.7°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 65°F (18°C) to 68°F (20°C). This is already quite warm water, which is ideal for most people. Swimming becomes comfortable, and prolonged stays in the water do not cause discomfort. This temperature is perfect for family trips and for those who prefer warmer water. It is also comfortable for water sports such as surfing or swimming. 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 23 | 16.2°C | 15.0°C | |
| JUN 24 | 16.2°C | 15.0°C | |
| JUN 25 | 16.2°C | 15.0°C | |
| JUN 26 | 17.1°C | 15.0°C | |
| JUN 27 | 17.1°C | 15.0°C | |
| JUN 28 | 17.1°C | 15.0°C | |
| JUN 29 | 17.9°C | 15.0°C | |
| JUN 30 | 18.7°C | 15.0°C | |
| JUL 1 | 19.0°C | 18.7°C | |
| JUL 2 | 19.0°C | 18.7°C | |
| JUL 3 | 19.0°C | 18.7°C | |
| JUL 4 | 19.0°C | 18.8°C | |
| JUL 5 | 19.0°C | 18.8°C | |
| JUL 6 | 19.0°C | 18.8°C | |
| JUL 7 | 19.0°C | 18.8°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 | 3°C | 6°C |
| February | 0°C | 2°C | 5°C |
| March | 0°C | 2°C | 5°C |
| April | 0°C | 4°C | 8°C |
| May | 5°C | 10°C | 15°C |
| June | 10°C | 15°C | 20°C |
| July | 14°C | 19°C | 24°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 |
Bollnäs: Weather Forecast
July 1
July 2
July 3
July 4
Location & Local Information
Bollnäs, situated inland in Gävleborg County, is surrounded by small lakes and the Voxnan river system, where water temperatures show clear seasonal variation. In spring (April–May) meltwater and cool air keep temperatures low, typically around 0–10 °C (32–50 °F). By early summer (June) surface temperatures commonly rise into the mid-teens, and in the warmest months (July–August) many lakes reach roughly 18–24 °C (64–75 °F), with sheltered shallow bays warming most quickly. Into September and October temperatures usually fall back to about 8–15 °C (46–59 °F). In winter the open water is generally at or close to freezing, about 0–2 °C (32–36 °F), and lakes and slower river stretches commonly ice over.
Swimming in Bollnäs’ lakes and rivers is a common summer leisure activity and is generally allowed where there are informal or municipal bathing spots, but local conditions determine safety. Authorities and landowners may post restrictions if water quality, algae blooms, strong currents—particularly in river channels—or other hazards are present. Ice and near-freezing water in winter make unprotected swimming dangerous; however, supervised winter bathing with ice holes and safety measures is practiced by some. As with any inland waters, swimmers should consider temperature-related risks, currents, and posted guidance before entering.