Megunticook Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Megunticook Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Megunticook Lake today is 18.6°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 | 17.9°C | 15.6°C | |
| JUN 24 | 18.2°C | 15.6°C | |
| JUN 25 | 18.2°C | 15.6°C | |
| JUN 26 | 18.2°C | 15.6°C | |
| JUN 27 | 18.3°C | 15.6°C | |
| JUN 28 | 18.5°C | 15.6°C | |
| JUN 29 | 18.5°C | 15.6°C | |
| JUN 30 | 18.5°C | 15.6°C | |
| JUL 1 | 24.5°C | 18.9°C | |
| JUL 2 | 24.5°C | 19.2°C | |
| JUL 3 | 24.5°C | 19.5°C | |
| JUL 4 | 24.5°C | 19.8°C | |
| JUL 5 | 24.5°C | 20.1°C | |
| JUL 6 | 24.5°C | 20.4°C | |
| JUL 7 | 24.5°C | 20.7°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 | 0°C | 3°C | 5°C |
| March | 1°C | 3°C | 6°C |
| April | 1°C | 4°C | 8°C |
| May | 7°C | 11°C | 15°C |
| June | 12°C | 16°C | 19°C |
| July | 19°C | 25°C | 30°C |
| August | 22°C | 25°C | 28°C |
| September | 19°C | 22°C | 25°C |
| October | 13°C | 16°C | 19°C |
| November | 4°C | 9°C | 14°C |
| December | 2°C | 5°C | 7°C |
Megunticook Lake: Water Temperature by Location
Megunticook Lake: Weather Forecast
July 1
July 2
July 3
July 4
July 5
July 6
Location & Local Information
Megunticook Lake in mid-coast Maine experiences marked seasonal shifts in water temperature. In spring (April–June) surface readings commonly climb from about 40–55°F (4–13°C) as snowmelt and cool air still influence the lake. Peak summer temperatures (July–August) typically reach the warmest values, often ranging from roughly 65–75°F (18–24°C) in open water and occasionally into the upper 70s°F (≈25°C) in shallow, sheltered coves on hot afternoons. By early fall (September–October) the surface cools again to about 50–65°F (10–18°C) as air temperatures drop. In winter the lake approaches freezing, with surface values near 32–39°F (0–4°C) and often develops ice cover that persists until thaw.
Swimming is commonly practiced in the warmer months when surface temperatures are comfortably in the mid-60s to mid-70s°F (around 18–24°C), and public access points or private shorelines permit it. However, swimming is not advisable year-round: cold spring or fall water poses risks of cold-water shock and hypothermia, and winter ice makes open-water swimming unsafe. As with any natural body of water, local rules, beach signage, and water-quality advisories should be checked before entering, and swimmers should exercise caution regarding depth, drop-offs, and the absence of lifeguards.