Sebasticook Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Sebasticook Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Sebasticook 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 | 18.7°C | 14.9°C | |
| JUN 24 | 18.7°C | 14.9°C | |
| JUN 25 | 18.8°C | 14.9°C | |
| JUN 26 | 18.8°C | 14.9°C | |
| JUN 27 | 18.6°C | 14.9°C | |
| JUN 28 | 18.7°C | 14.9°C | |
| JUN 29 | 18.7°C | 14.9°C | |
| JUN 30 | 18.8°C | 14.9°C | |
| JUL 1 | 22.5°C | 18.8°C | |
| JUL 2 | 22.5°C | 19.0°C | |
| JUL 3 | 22.5°C | 19.2°C | |
| JUL 4 | 22.5°C | 19.4°C | |
| JUL 5 | 22.5°C | 19.6°C | |
| JUL 6 | 22.5°C | 19.8°C | |
| JUL 7 | 22.5°C | 20.0°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 | 4°C |
| February | 0°C | 2°C | 4°C |
| March | 0°C | 2°C | 4°C |
| April | 0°C | 5°C | 9°C |
| May | 6°C | 10°C | 14°C |
| June | 10°C | 15°C | 19°C |
| July | 19°C | 23°C | 26°C |
| August | 21°C | 23°C | 26°C |
| September | 18°C | 21°C | 23°C |
| October | 12°C | 16°C | 19°C |
| November | 2°C | 8°C | 13°C |
| December | 0°C | 2°C | 5°C |
Sebasticook Lake: Water Temperature by Location
Sebasticook Lake: Weather Forecast
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July 5
Location & Local Information
Sebasticook Lake, a freshwater body in central Maine, experiences marked seasonal changes in water temperature typical of New England inland lakes. In late spring (May–June) surface temperatures often run from about 45–60°F (7–15°C) as the lake stratifies. Peak summer (July–August) brings the warmest water, commonly 65–75°F (18–24°C) in most swimming areas and occasionally reaching around 80°F (27°C) in shallow, sheltered bays on very warm afternoons. Early fall (September–October) sees a steady cooling to roughly 50–65°F (10–18°C) before the lake cools further and freezes; winter surface temperatures approach 32°F (0°C) under ice, making open-water swimming effectively impossible during that season.
Swimming is generally permitted on Sebasticook Lake because it is used for public recreation and has accessible shoreline and boat launch areas, though specific parcels of shoreline may be privately owned or posted. Recreational swimming is most comfortable in midsummer when surface temperatures are warmest; outside that window swimmers face colder water and a heightened risk of hypothermia. There may be no lifeguards at informal entry points, so swimmers should exercise usual precautions—swim with companions, avoid alcohol, and heed any local advisories about water quality or access before entering the water.