Merrymeeting Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Merrymeeting Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Merrymeeting Lake today is 21.7°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature ranges from 68°F (20°C) to 74°F (23°C). The water is warm and pleasant for swimming, and in this range, one can stay in the water for extended periods without the risk of hypothermia. This is the ideal temperature for relaxation, swimming, and water sports. Families with children, as well as outdoor enthusiasts, will enjoy swimming and time spent in the water. For most people, this is the optimal temperature for a comfortable beach experience. 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 25 | 20.2°C | 16.6°C | |
| JUN 26 | 20.2°C | 16.6°C | |
| JUN 27 | 20.3°C | 16.6°C | |
| JUN 28 | 20.4°C | 16.6°C | |
| JUN 29 | 20.3°C | 16.6°C | |
| JUN 30 | 20.3°C | 16.6°C | |
| JUL 1 | 20.7°C | 25.0°C | |
| JUL 2 | 21.3°C | 25.0°C | |
| JUL 3 | 25.0°C | 21.9°C | |
| JUL 4 | 25.0°C | 22.0°C | |
| JUL 5 | 25.0°C | 22.2°C | |
| JUL 6 | 25.0°C | 22.4°C | |
| JUL 7 | 25.0°C | 22.5°C | |
| JUL 8 | 25.0°C | 22.7°C | |
| JUL 9 | 25.0°C | 22.9°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 | 1°C | 8°C | 15°C |
| February | 1°C | 7°C | 13°C |
| March | 2°C | 8°C | 13°C |
| April | 2°C | 9°C | 16°C |
| May | 8°C | 14°C | 19°C |
| June | 13°C | 17°C | 21°C |
| July | 19°C | 25°C | 31°C |
| August | 21°C | 23°C | 26°C |
| September | 19°C | 22°C | 24°C |
| October | 12°C | 16°C | 19°C |
| November | 4°C | 8°C | 12°C |
| December | 1°C | 4°C | 7°C |
Merrymeeting Lake: Water Temperature by Location
Merrymeeting Lake: Weather Forecast
July 3
July 4
July 5
July 6
July 7
July 8
Location & Local Information
Merrymeeting Lake in New Hampshire experiences typical New England seasonal swings in water temperature. In spring the surface usually warms from roughly 40–60°F (4–16°C) as ice melts and the sun strengthens, while summer brings the warmest conditions with surface readings most commonly in the 65–75°F (18–24°C) range and occasionally reaching the upper 70s°F (25–26°C) in shallow, sheltered areas on hot afternoons. By early fall temperatures decline back toward 50–60°F (10–16°C) as cooling and turnover occur. In winter the lake often develops ice and surface temperatures are near freezing, about 32°F (0°C), with subsurface water remaining only a few degrees above freezing beneath the ice.
Swimming in Merrymeeting Lake is generally possible where public access or private shoreline permission exists, and many people swim during the warmer months when surface temperatures are most comfortable. Local rules, water-quality advisories, and safety conditions such as depth changes, aquatic vegetation, boat traffic, and weather should be checked before entering the water. Winter swimming is uncommon and hazardous because of ice and near‑freezing water, so it is not recommended except in supervised, controlled situations with appropriate precautions.