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 22, 2026 (9 hrs ago).
- Cold · below 60°F · 384
- Cool · 60–69°F · 607
- Comfortable · 70–86°F · 929
- Warm · above 86°F · 215
- 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.
- ARROYO HONDO NR SAN JOSE CAUSGS gauge · California · 1 ft³/s65°F10 mi1 day ago
- COYOTE C AB HWY 237 A MILPITAS CAUSGS gauge · California · 8 ft³/s69°F11 mi1 day ago
- COYOTE C NR MADRONE CAUSGS gauge · California · 11 ft³/s70°F12 mi1 day ago
- ALAMEDA C AB DIV DAM NR SUNOL CAUSGS gauge · California · 0 ft³/s64°F13 mi1 day ago
- ALAMEDA C BL DIV DAM NR SUNOL CAUSGS gauge · California · 0 ft³/s67°F13 mi1 day ago
- CALAVERAS C NR SUNOL CAUSGS gauge · California · 7 ft³/s56°F13 mi1 day ago
- ALAMEDA C BL CALAVERAS C NR SUNOL CAUSGS gauge · California · 8 ft³/s57°F14 mi1 day ago
- SALT POND A4 NR ALVISO CAUSGS gauge · California74°F14 mi1 day ago
Nearest swimmable spots
Rated, photographed water destinations within 25 miles — pair one with the nearest sensor reading above before you go.
4.7(5,945)Vasona Lake County Park
Public green space with 45 acres of lawn, a multi-use trail & picnic areas plus a lake with fishing.
12 mi from your location
4.5(4,004)Alviso Marina County Park
Hiking, biking & bird-watching are popular activities at this bayside park with paths & boardwalks.
14 mi from your location
4.7(475)Lake Elizabeth
Recreation area with a bird-filled island, plus a dog park, playgrounds, sports fields & boat ramp.
19 mi from your location
4.6(1,992)Quarry Lakes Regional Recreation Area
Lakefront park offers 471 acres of space for picnicking, swimming, fishing & non-motorized boating.
22 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.