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 (16 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.
- COYOTE C NR MADRONE CAUSGS gauge · California · 11 ft³/s70°F8.1 mi16 hrs ago
- ARROYO HONDO NR SAN JOSE CAUSGS gauge · California · 1 ft³/s65°F29 mi17 hrs ago
- ALAMEDA C AB DIV DAM NR SUNOL CAUSGS gauge · California · 0 ft³/s64°F31 mi16 hrs ago
- ALAMEDA C BL DIV DAM NR SUNOL CAUSGS gauge · California · 0 ft³/s67°F31 mi16 hrs ago
- COYOTE C AB HWY 237 A MILPITAS CAUSGS gauge · California · 8 ft³/s69°F31 mi17 hrs ago
- CALAVERAS C NR SUNOL CAUSGS gauge · California · 7 ft³/s56°F32 mi16 hrs ago
- ALAMEDA C BL CALAVERAS C NR SUNOL CAUSGS gauge · California · 8 ft³/s57°F33 mi17 hrs ago
- SALT POND A4 NR ALVISO CAUSGS gauge · California74°F34 mi16 hrs ago
Nearest swimmable spots
Rated, photographed water destinations within 25 miles — pair one with the nearest sensor reading above before you go.
4.5(388)Manresa Uplands State Beach & Campground
Seasonal walk-in tent sites with nearby beach access, flush toilets & coin-operated showers.
21 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.
21 mi from your location
4.2(174)Sunset State Beach Campground
Tranquil beach campground providing tent & RV sites, picnic spots & ocean fishing with a permit.
21 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
4.7(2,850)Sunset State Beach
Beach surrounded by steep sand dunes offering picnic areas & campsites, plus bay & mountain views.
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.