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.
- 72°F4.5 mi1 day ago
- SAN MATEO C BL LO CRYSTAL SP RES NR SAN MATEO CAUSGS gauge · California · 3 ft³/s63°F5.4 mi1 day ago
- PILARCITOS C BL STONE DAM NR HILLSBOROUGH CAUSGS gauge · California · 2 ft³/s60°F7.6 mi1 day ago
- 72°F7.7 mi1 day ago
- SALT POND A4 NR ALVISO CAUSGS gauge · California74°F16 mi1 day ago
- ALAMEDA C NR NILES CAUSGS gauge · California · 12 ft³/s70°F17 mi1 day ago
- COYOTE C AB HWY 237 A MILPITAS CAUSGS gauge · California · 8 ft³/s69°F19 mi1 day ago
- 65°F21 mi1 day ago
Nearest swimmable spots
Rated, photographed water destinations within 25 miles — pair one with the nearest sensor reading above before you go.
4.5(861)Bedwell Bayfront Park
Large bayside park with expansive open spaces for flying kites & several hiking trails.
5.2 mi from your location
4.7(1,151)Poplar Beach
Sunbathing, fishing & picnicking are popular pastimes at this scenic beach with a campground nearby.
11 mi from your location
4.7(855)Mavericks Beach
Legendary beach known as a destination for serious big-wave surfers & an invite-only contest.
13 mi from your location
4.7(4,820)Pacifica State Beach
Known for being a popular surfing locale, this crescent-shaped beach also offers trails & restrooms.
14 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.
14 mi from your location
4.8(74)Sharp Park Beach
Beyond its nature trails & coastal views, this scenic beach features a popular fishing pier.
15 mi from your location
4.6(2,129)San Gregorio State Beach
Sheltered by soaring cliffs, this coastal park has a wide sandy beach & a driftwood-strewn estuary.
16 mi from your location
4.6(1,883)Alameda Beach
Long, sandy strip with volleyball courts, ending in a bird sanctuary & backed by fast-food places.
16 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.
16 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.
17 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.