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 25.5°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature ranges from 75°F (23°C) to 79°F (26°C). This is a very comfortable temperature for swimming, and many people can enjoy prolonged stays in the water without feeling cold. The water is pleasantly warm, making it ideal for relaxation and water sports. This temperature range is particularly popular among tourists, as it combines comfort and safety for health. 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 4 | 25.0°C | 20.6°C | |
| AUG 5 | 25.0°C | 20.6°C | |
| AUG 6 | 25.2°C | 20.6°C | |
| AUG 7 | 25.1°C | 20.6°C | |
| AUG 8 | 25.1°C | 20.6°C | |
| AUG 9 | 25.5°C | 20.6°C | |
| AUG 10 | 25.5°C | 20.6°C | |
| AUG 11 | 25.5°C | 20.6°C | |
| AUG 12 | 20.6°C | 25.3°C | |
| AUG 13 | 20.6°C | 25.0°C | |
| AUG 14 | 20.6°C | 24.8°C | |
| AUG 15 | 20.6°C | 24.5°C | |
| AUG 16 | 20.6°C | 24.3°C | |
| AUG 17 | 20.6°C | 24.0°C | |
| AUG 18 | 20.6°C | 23.8°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 | 1°C | 4°C | 6°C |
| February | 2°C | 4°C | 7°C |
| March | 1°C | 4°C | 7°C |
| April | 1°C | 4°C | 8°C |
| May | 5°C | 10°C | 16°C |
| June | 10°C | 15°C | 20°C |
| July | 13°C | 19°C | 25°C |
| August | 16°C | 21°C | 26°C |
| September | 15°C | 19°C | 22°C |
| October | 10°C | 15°C | 19°C |
| November | 5°C | 10°C | 14°C |
| December | 1°C | 4°C | 8°C |
Long Lake: Water Temperature by Location
Long Lake: Weather Forecast
August 12
August 13
August 14
August 15
August 16
Location & Local Information
Long Lake in Maine experiences a wide range of water temperatures through the year because of its northern climate and seasonal stratification. In late spring (May–June) surface temperatures typically rise from about 45–60°F (7–16°C) as ice-out gives way to warming; in midsummer (July–August) the surface commonly reaches roughly 68–75°F (20–24°C) at the warmest and can be slightly warmer in shallow bays and nearshore shallows. By early fall (September–October) surface temperatures usually cool back into the 60s°F (about 16–20°C). During winter, when the lake is ice-covered, the water just beneath the ice will be near freezing up to around 34–39°F (0–4°C) while deeper layers remain a few degrees warmer.
Swimming in Long Lake is permitted and commonly practiced in summer at public beaches and accessible shorelines because surface temperatures during July and August are comfortable for most swimmers. Conditions vary by location on the lake, wind, and recent weather, so swimmers should prefer designated swimming areas, heed any local advisories about water quality or algal blooms, and be mindful of cold-water risks outside peak summer months. Cold, deep water and boat traffic also make cautious practices—such as not swimming alone and wearing a life jacket when boating—important year-round.