Massabesic Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Massabesic Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Massabesic Lake today is 19.7°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 |
|---|---|---|---|
| SEP 16 | 20.8°C | 23.0°C | |
| SEP 17 | 19.4°C | 23.0°C | |
| SEP 18 | 19.9°C | 23.0°C | |
| SEP 19 | 20.6°C | 23.0°C | |
| SEP 20 | 20.6°C | 23.0°C | |
| SEP 21 | 20.5°C | 23.0°C | |
| SEP 22 | 20.0°C | 23.0°C | |
| SEP 23 | 19.7°C | 23.0°C | |
| SEP 24 | 23.0°C | 19.9°C | |
| SEP 25 | 23.0°C | 20.0°C | |
| SEP 26 | 23.0°C | 20.2°C | |
| SEP 27 | 23.0°C | 20.4°C | |
| SEP 28 | 23.0°C | 20.5°C | |
| SEP 29 | 23.0°C | 20.7°C | |
| SEP 30 | 23.0°C | 20.9°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 | 0°C | 2°C | 4°C |
| February | 0°C | 3°C | 6°C |
| March | 0°C | 3°C | 7°C |
| April | 3°C | 11°C | 19°C |
| May | 11°C | 16°C | 21°C |
| June | 15°C | 19°C | 24°C |
| July | 21°C | 27°C | 33°C |
| August | 22°C | 26°C | 29°C |
| September | 20°C | 23°C | 26°C |
| October | 12°C | 16°C | 20°C |
| November | 3°C | 8°C | 12°C |
| December | 0°C | 3°C | 6°C |
Massabesic Lake: Water Temperature by Location
Massabesic Lake: Weather Forecast
September 23
September 24
September 25
September 26
September 27
September 28
Location & Local Information
Lake Massabesic, which functions as a municipal reservoir in southern New Hampshire, experiences the expected seasonal swings in surface water temperature for the region. In spring the lake often runs cold, roughly 35–55°F (2–13°C) as ice melts and cool runoff enters the basin. By summer surface temperatures commonly climb into the mid-60s to mid-70s °F (18–24°C), and on warm, calm days shallow areas can reach the upper 70s °F (25–26°C). Fall brings a steady cooling back toward the 40s–60s °F range (4–16°C) as the lake mixes, while winter conditions drop the surface to around freezing (32°F / 0°C), with ice cover likely and deeper waters remaining colder, often in the 40s °F (4–9°C) year-round.
Swimming on Lake Massabesic is generally not permitted in many parts because the lake serves as a primary drinking-water supply for Manchester and surrounding areas; restrictions are aimed at protecting water quality and public health. Even where informal access exists, users should be aware of safety concerns such as cold water shock, sudden depth changes and the absence of lifeguards. For recreation, visitors are advised to check local water-utility and town regulations before planning any water-based activities.