Live · updated daily from USGS
Swimmable water near you
2,137 USGS sensors are reporting a live water temperature right now, the newest reading from August 21, 2026 (8 hrs ago).
- Cold · below 60°F · 375
- Cool · 60–69°F · 595
- Comfortable · 70–86°F · 938
- Warm · above 86°F · 229
- 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.
- ISINGLASS R AT ROCHESTER NECK RD, NR DOVER, NHUSGS gauge · New Hampshire · 4 ft³/s64°F26 mi9 hrs ago
- SACO RIVER AT RIVER STREET, AT BARTLETT, NHUSGS gauge · New Hampshire · 61 ft³/s60°F36 mi9 hrs ago
- LAMPREY RIVER AT LANGFORD ROAD, AT RAYMOND, NHUSGS gauge · New Hampshire · 7 ft³/s71°F37 mi9 hrs ago
- SOUTH BRANCH PISCATAQUOG RIVER NEAR GOFFSTOWN, NHUSGS gauge · New Hampshire · 15 ft³/s68°F46 mi9 hrs ago
- 63°F55 mi9 hrs ago
- Wild River at Gilead, MaineUSGS gauge · Maine · 26 ft³/s65°F57 mi9 hrs ago
- SOUHEGAN RIVER (SITE WLR-1) NEAR MILFORD, NHUSGS gauge · New Hampshire · 33 ft³/s69°F58 mi9 hrs ago
- ASHUELOT RIVER NEAR GILSUM, NHUSGS gauge · New Hampshire · 12 ft³/s66°F68 mi9 hrs ago
Nearest swimmable spots
Rated, photographed water destinations within 25 miles — pair one with the nearest sensor reading above before you go.
4.6(38)Lake Wentworth
Lake with numerous small islands, bordered by a state park offering swimming, boating & fishing.
1.2 mi from your location
4.8(51)Merrymeeting Lake
Lush hills & vacation homes surround this water body offering fishing, boating, swimming & more.
6.9 mi from your location
4.9(11)Mirror Lake
This picturesque 333-acre lake features swimming, boating, fishing & other outdoor recreation.
6.9 mi from your location
4.8(33)Great East Lake
This lake bordering Maine & New Hampshire offers activities such as boating, fishing & water skiing.
7.7 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.