Umbagog Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Umbagog Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Umbagog Lake today is 21.9°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 |
|---|---|---|---|
| AUG 4 | 22.8°C | 21.1°C | |
| AUG 5 | 22.8°C | 21.1°C | |
| AUG 6 | 23.0°C | 21.1°C | |
| AUG 7 | 20.8°C | 21.1°C | |
| AUG 8 | 20.9°C | 21.1°C | |
| AUG 9 | 20.9°C | 21.1°C | |
| AUG 10 | 21.0°C | 21.1°C | |
| AUG 11 | 21.9°C | 21.1°C | |
| AUG 12 | 21.1°C | 21.9°C | |
| AUG 13 | 21.1°C | 21.8°C | |
| AUG 14 | 21.1°C | 21.8°C | |
| AUG 15 | 21.1°C | 21.7°C | |
| AUG 16 | 21.1°C | 21.7°C | |
| AUG 17 | 21.1°C | 21.7°C | |
| AUG 18 | 21.1°C | 21.6°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 | 2°C | 4°C |
| March | 0°C | 3°C | 5°C |
| April | 1°C | 4°C | 7°C |
| May | 4°C | 8°C | 12°C |
| June | 9°C | 13°C | 17°C |
| July | 16°C | 21°C | 26°C |
| August | 19°C | 21°C | 24°C |
| September | 16°C | 20°C | 24°C |
| October | 8°C | 12°C | 16°C |
| November | 4°C | 7°C | 9°C |
| December | 0°C | 3°C | 5°C |
Umbagog Lake: Water Temperature by Location
Umbagog Lake: Weather Forecast
August 12
August 13
August 14
August 15
Location & Local Information
Umbagog Lake, straddling the Maine–New Hampshire border, is a northern New England water body that stays relatively cool through much of the year. Typical surface temperatures in spring range from roughly 40–55°F (4–13°C) as the lake finishes thawing and stratification begins. In summer, sheltered bays and shallow areas can warm to about 60–75°F (15–24°C) on sunny days, while open-water surface averages more commonly sit in the low to mid 60s°F (≈17–19°C). By fall the surface cools back into the 45–60°F range (7–16°C) as air temperatures drop. Deeper water remains markedly colder throughout the year, and in winter the lake can ice over and is not suitable for open-water swimming.
Swimming is allowed and commonly practiced by visitors, particularly in summer when surface temperatures are most comfortable. The area includes public access points and the nearby state park provides places to launch boats and reach the shoreline, but there are generally no staffed beaches or lifeguards. Because the lake is large, variable in depth, and retains cold water at depth, swimmers should exercise caution about hypothermia, sudden temperature changes, boat traffic and underwater hazards. Overall, recreational swimming is possible in warm months but requires normal wilderness-safety precautions.