Vallentunasjön — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Vallentunasjön, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Vallentunasjön today is 18.9°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 |
|---|---|---|---|
| AUG 24 | 18.0°C | 22.0°C | |
| AUG 25 | 18.0°C | 22.0°C | |
| AUG 26 | 18.0°C | 22.0°C | |
| AUG 27 | 18.0°C | 22.0°C | |
| AUG 28 | 18.2°C | 22.0°C | |
| AUG 29 | 18.1°C | 22.0°C | |
| AUG 30 | 18.1°C | 22.0°C | |
| AUG 31 | 18.1°C | 22.0°C | |
| SEP 1 | 18.0°C | 18.9°C | |
| SEP 2 | 18.0°C | 18.8°C | |
| SEP 3 | 18.0°C | 18.8°C | |
| SEP 4 | 18.0°C | 18.7°C | |
| SEP 5 | 18.0°C | 18.7°C | |
| SEP 6 | 18.0°C | 18.6°C | |
| SEP 7 | 18.0°C | 18.6°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 | 3°C | 6°C |
| February | 0°C | 3°C | 6°C |
| March | 0°C | 4°C | 7°C |
| April | 4°C | 8°C | 11°C |
| May | 7°C | 12°C | 18°C |
| June | 12°C | 18°C | 24°C |
| July | 15°C | 21°C | 27°C |
| August | 17°C | 22°C | 27°C |
| September | 12°C | 18°C | 23°C |
| October | 7°C | 11°C | 14°C |
| November | 3°C | 7°C | 10°C |
| December | 0°C | 4°C | 7°C |
Vallentunasjön: Water Temperature by Location
Vallentunasjön: Weather Forecast
September 1
September 2
September 3
September 4
Location & Local Information
Vallentunasjön, a modest lake in Stockholm County near the town of Vallentuna, experiences marked seasonal variation in water temperature typical for the region. During winter the surface often drops to around 0–4 °C (32–39 °F), and some winters the lake freezes over. In spring temperatures commonly rise through roughly 4–12 °C (39–54 °F) as ice melts and the water warms. Summer brings the warmest conditions, with typical surface temperatures of about 15–22 °C (59–72 °F) and occasional heat spells pushing parts of the lake toward 24–25 °C (75–77 °F). In autumn the water cools again to roughly 5–15 °C (41–59 °F) as the season progresses.
Swimming in Vallentunasjön is generally allowed and is practiced at public access points and informal bathing spots around the shoreline, since the lake is part of the local outdoor environment and not subject to a blanket ban. Local authorities or municipal services often monitor water quality and post advisories if issues such as cyanobacterial blooms or pollution occur, so swimmers should heed signs and guidance. Ice swimming is done by some residents in winter but requires careful safety measures and is not recommended without proper equipment or supervision. Standard precautions apply: check water quality updates, watch for boat traffic, and be aware of variable depths and bottom conditions.