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 (18 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.
- PILARCITOS C BL STONE DAM NR HILLSBOROUGH CAUSGS gauge · California · 2 ft³/s60°F18 mi19 hrs ago
- SAN MATEO C BL LO CRYSTAL SP RES NR SAN MATEO CAUSGS gauge · California · 3 ft³/s63°F18 mi18 hrs ago
- 72°F23 mi19 hrs ago
- 72°F23 mi19 hrs ago
- SALT POND A4 NR ALVISO CAUSGS gauge · California74°F25 mi18 hrs ago
- COYOTE C AB HWY 237 A MILPITAS CAUSGS gauge · California · 8 ft³/s69°F29 mi19 hrs ago
- ALAMEDA C NR NILES CAUSGS gauge · California · 12 ft³/s70°F33 mi19 hrs ago
- ALAMEDA C BL WELCH C NR SUNOL CAUSGS gauge · California · 7 ft³/s63°F36 mi19 hrs ago
Nearest swimmable spots
Rated, photographed water destinations within 25 miles — pair one with the nearest sensor reading above before you go.
Pescadero State Beach
This mile-long stretch of isolated beach along a road features fishing, picnicking & tide pools.
0.6 mi from your location
4.7(1,338)Pomponio State Beach
Oceanside scenic sandy beaches with a small lagoon, plus picnic tables & barbecues.
2.1 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.
3.7 mi from your location
4.7(1,151)Poplar Beach
Sunbathing, fishing & picnicking are popular pastimes at this scenic beach with a campground nearby.
13 mi from your location
4.7(855)Mavericks Beach
Legendary beach known as a destination for serious big-wave surfers & an invite-only contest.
16 mi from your location
4.5(861)Bedwell Bayfront Park
Large bayside park with expansive open spaces for flying kites & several hiking trails.
20 mi from your location
4.7(1,756)Shark Fin Cove
Tiny, much-photographed beach known for a rock jutting out of the water & a sea cave that frames it.
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.

