Live · updated daily from USGS
Swimmable water near you
2,135 USGS sensors are reporting a live water temperature right now, the newest reading from August 21, 2026 (23 hrs ago).
- Cold · below 60°F · 375
- Cool · 60–69°F · 594
- Comfortable · 70–86°F · 938
- Warm · above 86°F · 228
- You
A map of the United States with one coloured dot per USGS sensor reporting a live water temperature. The readings are listed below.
Nearest live readings
The closest USGS sensors currently reporting a water temperature, nearest first.
- SOUTH BRANCH PISCATAQUOG RIVER NEAR GOFFSTOWN, NHUSGS gauge · New Hampshire · 15 ft³/s68°F25 mi23 hrs ago
- COLD RIVER AT HIGH STREET, AT ALSTEAD, NHUSGS gauge · New Hampshire · 8 ft³/s66°F27 mi23 hrs ago
- ASHUELOT RIVER NEAR GILSUM, NHUSGS gauge · New Hampshire · 12 ft³/s66°F28 mi1 day ago
- SOUHEGAN RIVER (SITE WLR-1) NEAR MILFORD, NHUSGS gauge · New Hampshire · 33 ft³/s69°F35 mi23 hrs ago
- LAMPREY RIVER AT LANGFORD ROAD, AT RAYMOND, NHUSGS gauge · New Hampshire · 7 ft³/s71°F40 mi23 hrs ago
- ISINGLASS R AT ROCHESTER NECK RD, NR DOVER, NHUSGS gauge · New Hampshire · 4 ft³/s64°F47 mi1 day ago
- CONNECTICUT RIVER NEAR NORTHFIELD, MAUSGS gauge · Massachusetts · 5,880 ft³/s78°F53 mi1 day ago
- SACO RIVER AT RIVER STREET, AT BARTLETT, NHUSGS gauge · New Hampshire · 61 ft³/s60°F60 mi23 hrs ago
Nearest swimmable spots
Rated, photographed water destinations within 25 miles — pair one with the nearest sensor reading above before you go.
4.8(12)Pleasant Lake
Small, quiet lake with fishing, swimming beaches & an upscale waterfront inn with a restaurant.
7.5 mi from your location
4.8(82)Lake Sunapee
Sizable natural lake for fishing & boating, with multiple sandy beaches, parks & lighthouses.
8.9 mi from your location
4.7(29)Weare Reservoir
Reservoir on the Piscataquog River with fishing & a public park with a beach & a boat ramp.
17 mi from your location
Newfound Lake
Home to many fish species, this lake in Wellington State Park offers a boat launch & swimming beach.
24 mi from your location
About this map
Every pin is a live reading from a USGS real-time monitoring station, captured in a daily snapshot. Colours follow the site’s cold-water-safety thresholds and describe the water at that one sensor — usually a river or stream gauge, not a swim beach — so treat them as a guide to what the water is doing nearby, not a verdict on a specific spot. Readings are provisional and can be revised by the USGS. Your location only sorts this page: the coordinates appear in the address bar (rounded to about a mile) and are not saved to an account or our database.
Conditions are for general information only and can change quickly. Always judge the water in person and follow posted advisories and local guidance before swimming or paddling.

