New Hampshire — Water Temperature Today and Throughout the Year
Discover water temperatures in New Hampshire (United States), with real-time data and annual trends. Find all locations in the region and check the water temperature in them. We find every place where you can swim and show you the water temperature there today and throughout the year.
Sea Water Temperature Along the Coast
Chart of Average Temperature Changes Over the Last 60 Days
Places with the Warmest Sea Water Today
The Most Popular Seaside Places
Coastal Seas and Oceans
Water Temperature in Lakes and Rivers
Popular Lakes
Popular Rivers
Popular Places
Water Temperature and Swimming Overview
Regions and Map
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Water Temperature Trends
New Hampshire, with its small but scenic stretch of coastline along the Atlantic Ocean, experiences relatively cool water temperatures compared to other regions. In the summer months, the ocean water along the coast typically reaches around 60°F to 70°F (16°C to 21°C), which is refreshing but not particularly warm for swimming. Due to the state's northern location and the influence of the colder currents in the North Atlantic, water temperatures remain cooler throughout the year, with winter temperatures often dropping to around 32°F (0°C), making the coast too cold for swimming.
In contrast to the coastal waters, New Hampshire's inland lakes and rivers can be more suitable for water activities. The state's lakes, such as Lake Winnipesaukee, have more variable temperatures depending on the time of year. During the summer, the surface temperatures of these lakes can rise to about 70°F to 75°F (21°C to 24°C), making them more inviting for swimming and boating. Smaller lakes at higher elevations or in the northern parts of the state may have slightly cooler waters, with temperatures hovering around 60°F (15°C) in the summer months.
As the weather cools in the fall and winter, water temperatures in both lakes and rivers drop significantly. By October, the temperatures in lakes can fall to 50°F to 60°F (10°C to 15°C), making outdoor water activities less common. Rivers, especially in the higher elevations, can also cool down rapidly, with some areas experiencing water temperatures below 40°F (4°C) during the coldest months. These colder temperatures create a less favorable environment for recreational swimming and other water-based activities, though the state's rivers remain popular for cold-water fishing year-round.