Live · updated daily from USGS
Swimmable water near you
2,137 USGS sensors are reporting a live water temperature right now, the newest reading from August 21, 2026 (8 hrs ago).
- Cold · below 60°F · 375
- Cool · 60–69°F · 595
- Comfortable · 70–86°F · 938
- Warm · above 86°F · 229
- 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.
- COYOTE C NR MADRONE CAUSGS gauge · California · 11 ft³/s70°F15 mi9 hrs ago
- ARROYO HONDO NR SAN JOSE CAUSGS gauge · California · 1 ft³/s65°F36 mi9 hrs ago
- COYOTE C AB HWY 237 A MILPITAS CAUSGS gauge · California · 8 ft³/s69°F38 mi9 hrs ago
- ALAMEDA C AB DIV DAM NR SUNOL CAUSGS gauge · California · 0 ft³/s64°F38 mi9 hrs ago
- ALAMEDA C BL DIV DAM NR SUNOL CAUSGS gauge · California · 0 ft³/s67°F38 mi9 hrs ago
- MUD SLOUGH NR GUSTINE CAUSGS gauge · California · 7 ft³/s77°F38 mi9 hrs ago
- SAN JOAQUIN R AB MERCED R NR NEWMAN CAUSGS gauge · California · 110 ft³/s75°F38 mi9 hrs ago
- SAN JOAQUIN R A FREMONT FORD BRIDGE CAUSGS gauge · California · 64 ft³/s76°F39 mi9 hrs ago
Nearest swimmable spots
Rated, photographed water destinations within 25 miles — pair one with the nearest sensor reading above before you go.
4.2(174)Sunset State Beach Campground
Tranquil beach campground providing tent & RV sites, picnic spots & ocean fishing with a permit.
19 mi from your location
4.7(2,850)Sunset State Beach
Beach surrounded by steep sand dunes offering picnic areas & campsites, plus bay & mountain views.
19 mi from your location
4.5(388)Manresa Uplands State Beach & Campground
Seasonal walk-in tent sites with nearby beach access, flush toilets & coin-operated showers.
19 mi from your location
4.7(1,475)Manresa Main State Beach
Sandy stretch with unpredictable weather that's popular for surf fishing, surfing & sunsets.
20 mi from your location
4.8(27)Hidden Beach
Pacific front sandy beach in a sheltered cove with a neighborhood park, benches & playground.
21 mi from your location
4.5(887)Salinas River State Beach
Popular destination for bird-watching, fishing & horseback riding, with a dune trail & picnic area.
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.