Live · updated daily from USGS
Swimmable water near you
2,138 USGS sensors are reporting a live water temperature right now, the newest reading from August 21, 2026 (7 hrs ago).
- Cold · below 60°F · 376
- Cool · 60–69°F · 595
- Comfortable · 70–86°F · 938
- Warm · above 86°F · 229
A map of the United States with one coloured dot per USGS sensor reporting a live water temperature. The readings are listed below.
Warmest readings right now
The 10 warmest sensor readings in today’s snapshot — each links to its state’s full live table.
- #1 · FloridaGULF OF AMERICA NEAR CRYSTAL RIVER FLas of 8 hrs ago96°F
- #2 · CaliforniaHOT C A FLUME NR MAMMOTH LAKES CAas of 8 hrs ago94°F
- #3 · FloridaBLACKWATER RIVER NEAR GOODLAND, FLas of 8 hrs ago93°F
- #4 · South CarolinaWANDO RIVER AT CAINHOY BELOW WANDO, SCas of 8 hrs ago92°F
- #5 · FloridaEAST SIDE CREEK NEAR LAKE INGRAHAM, FLas of 8 hrs ago92°F
- #6 · TexasTrinity Rv at Liberty, TXas of 8 hrs ago92°F
- #7 · FloridaFAKA-UNION RIVER NEAR THE MOUTHas of 9 hrs ago92°F
- #8 · ArkansasRed River at Index, ARas of 8 hrs ago92°F
- #9 · FloridaSHAKETT CREEK AT CR 762 NR NOKOMIS, FLas of 8 hrs ago92°F
- #10 · South CarolinaSTONO RIVER AT MAIN RD BELOW RANTOWLES, SCas of 8 hrs ago92°F
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.