Annabessacook Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Annabessacook Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Annabessacook 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 3 | 11.9°C | 16.0°C | |
| JUN 4 | 12.3°C | 16.0°C | |
| JUN 5 | 12.5°C | 16.0°C | |
| JUN 6 | 13.5°C | 16.0°C | |
| JUN 7 | 18.0°C | 16.0°C | |
| JUN 8 | 18.1°C | 16.0°C | |
| JUN 10 | 18.6°C | 16.0°C | |
| JUN 11 | 16.0°C | 18.5°C | |
| JUN 12 | 16.0°C | 18.3°C | |
| JUN 13 | 16.0°C | 18.2°C | |
| JUN 14 | 16.0°C | 18.1°C | |
| JUN 15 | 16.0°C | 18.0°C | |
| JUN 16 | 16.0°C | 17.8°C | |
| JUN 17 | 16.0°C | 17.7°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 | 1°C | 4°C |
| February | 0°C | 1°C | 3°C |
| March | 0°C | 1°C | 3°C |
| April | 0°C | 4°C | 8°C |
| May | 6°C | 11°C | 15°C |
| June | 11°C | 16°C | 20°C |
| July | 20°C | 24°C | 27°C |
| August | 22°C | 26°C | 29°C |
| September | 20°C | 23°C | 25°C |
| October | 13°C | 17°C | 21°C |
| November | 0°C | 7°C | 14°C |
| December | 0°C | 1°C | 4°C |
Annabessacook Lake: Water Temperature by Location
Annabessacook Lake: Weather Forecast
June 9
June 10
June 11
June 12
June 13
Location & Local Information
Annabessacook Lake in Maine experiences a wide annual range of water temperatures. In winter the surface is typically at or just above freezing, around 32°F (0°C) under ice, while deeper water remains near 39–40°F (4–5°C). During spring the lake warms into the 40s and lower 50s°F (4–12°C) as ice-out progresses. In summer the warm surface layer commonly reaches roughly 65–80°F (18–27°C) on typical warm days, with the warmest late‑July and August afternoons occasionally pushing toward the upper end of that range; by fall temperatures decline back into the 40s–50s°F (7–15°C) as cooling and turnover occur.
Swimming is generally a permitted and popular recreational activity where public access points or beaches exist, because the lake is used for boating and shore recreation. However, local rules, private shoreline ownership, and occasional water‑quality advisories can restrict or recommend avoiding swimming; for example, cyanobacterial (blue‑green algae) blooms or bacterial contamination can lead to temporary advisories. Even when open for swimming, users should be mindful of seasonal conditions: cold spring and fall water temperatures increase risk of cold shock, and deeper, unstratified water remains much colder than the warm surface layer.