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.
- RUSSIAN R A HACIENDA BRIDGE NR GUERNEVILLE CAUSGS gauge · California · 101 ft³/s71°F26 mi9 hrs ago
- SONOMA CREEK A KENWOOD CAUSGS gauge · California · 0 ft³/s61°F27 mi9 hrs ago
- 68°F28 mi9 hrs ago
- 66°F34 mi9 hrs ago
- RUSSIAN R A DIGGER BEND NR HEALDSBURG CAUSGS gauge · California · 100 ft³/s71°F34 mi9 hrs ago
- DRY C BLW LAMBERT BR NR GEYSERVILLE CAUSGS gauge · California · 92 ft³/s57°F35 mi9 hrs ago
- 65°F36 mi9 hrs ago
- RUSSIAN R A JIMTOWN CAUSGS gauge · California · 104 ft³/s69°F36 mi9 hrs ago
Nearest swimmable spots
Rated, photographed water destinations within 25 miles — pair one with the nearest sensor reading above before you go.
4.7(347)Tomales Bay State Park
Park featuring swimming beaches, hiking trails, forests, marshes, picnic areas & wildlife.
1.2 mi from your location
4.8(104)McClures Beach
Secluded public beach with a wide expanse of sand, rocky cliffs, tidal pools & scenic views.
4.8 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.

