Live · updated daily from USGS
Swimmable water near you
2,136 USGS sensors are reporting a live water temperature right now, the newest reading from August 22, 2026 (7 hrs ago).
- Cold · below 60°F · 384
- Cool · 60–69°F · 607
- Comfortable · 70–86°F · 930
- 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.
- SALT POND A4 NR ALVISO CAUSGS gauge · California74°F28 mi1 day ago
- PILARCITOS C BL STONE DAM NR HILLSBOROUGH CAUSGS gauge · California · 2 ft³/s60°F28 mi1 day ago
- SAN MATEO C BL LO CRYSTAL SP RES NR SAN MATEO CAUSGS gauge · California · 3 ft³/s63°F28 mi1 day ago
- 72°F29 mi1 day ago
- COYOTE C AB HWY 237 A MILPITAS CAUSGS gauge · California · 8 ft³/s69°F30 mi1 day ago
- 72°F32 mi1 day ago
- COYOTE C NR MADRONE CAUSGS gauge · California · 11 ft³/s70°F38 mi1 day ago
- ALAMEDA C NR NILES CAUSGS gauge · California · 12 ft³/s70°F38 mi1 day ago
Nearest swimmable spots
Rated, photographed water destinations within 25 miles — pair one with the nearest sensor reading above before you go.
4.8(326)Pescadero State Beach
This mile-long stretch of isolated beach along a road features fishing, picnicking & tide pools.
11 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.
11 mi from your location
4.7(1,338)Pomponio State Beach
Oceanside scenic sandy beaches with a small lagoon, plus picnic tables & barbecues.
13 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.
15 mi from your location
4.6(214)Four Mile Beach
A mile-long stretch of white sand in Wilder Ranch State Park, a popular destination for surfers.
16 mi from your location
4.7(2,124)Natural Bridges State Beach
Compact sandy patch with rock bridges & tidepools, popular for spotting seabirds, whales & seals.
19 mi from your location
4.7(3,860)Lighthouse Field State Beach
Iconic spot with a lighthouse offers a variety of vistas & pathways for dog walking & strolling.
20 mi from your location
4.6(1,950)Seabright Beach
Sandy beach offering swimming, surfing & views of the Walton Lighthouse, plus seasonal lifeguards.
21 mi from your location
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.
21 mi from your location
4.6(927)Twin Lakes State Beach
Wide, dog-friendly beach with cafes, sunset views & birdwatching trails around the adjacent lagoon.
21 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.