Long Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Long Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Long Lake today is 18.5°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 3 | 18.4°C | 19.5°C | |
| JUN 4 | 18.2°C | 19.5°C | |
| JUN 5 | 18.1°C | 19.5°C | |
| JUN 6 | 18.1°C | 19.5°C | |
| JUN 7 | 17.8°C | 19.5°C | |
| JUN 8 | 17.9°C | 19.5°C | |
| JUN 11 | 19.5°C | 18.6°C | |
| JUN 12 | 19.5°C | 18.6°C | |
| JUN 13 | 19.5°C | 18.7°C | |
| JUN 14 | 19.5°C | 18.7°C | |
| JUN 15 | 19.5°C | 18.8°C | |
| JUN 16 | 19.5°C | 18.8°C | |
| JUN 17 | 19.5°C | 18.9°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 | 5°C |
| February | 1°C | 3°C | 6°C |
| March | 1°C | 4°C | 7°C |
| April | 2°C | 8°C | 14°C |
| May | 11°C | 16°C | 21°C |
| June | 15°C | 20°C | 24°C |
| July | 14°C | 19°C | 24°C |
| August | 21°C | 24°C | 26°C |
| September | 15°C | 20°C | 24°C |
| October | 10°C | 15°C | 19°C |
| November | 5°C | 9°C | 12°C |
| December | 1°C | 4°C | 7°C |
Long Lake: Water Temperature by Location
Long Lake: Weather Forecast
June 9
June 10
June 11
June 12
Location & Local Information
Long Lake in Washington typically follows the patterns of small inland lakes in the region, with water temperatures that change noticeably by season. In summer the surface often warms to roughly 60–75°F (15–24°C) on average, with the warmest, shallow areas reaching into the mid- to upper 70s°F (around 24°C) in unusually hot spells. Spring and fall produce cooler conditions, commonly in the 40–60°F range (4–15°C), while winter temperatures hover near freezing to the low 40s°F (0–5°C) where ice or very cold water can occur. Deeper sections remain colder year-round, and temperature stratification can create large differences between surface and deeper water.
Swimming at Long Lake is generally allowed because it is a recreational freshwater lake with public access points and beaches in many areas, but local rules and conditions determine specific access and safety. Visitors should observe posted advisories for water quality (such as algae or bacterial blooms), obey any seasonal closures, and be mindful of hazards like cold-water shock, boat traffic, and sudden drop-offs. For safe swimming, check current local notices and use life jackets for weaker swimmers, since water temperature and on-the-water activity can change quickly.