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 (10 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.
- 65°F0.8 mi11 hrs ago
- 66°F1.3 mi11 hrs ago
- 68°F8.9 mi11 hrs ago
- 72°F18 mi11 hrs ago
- SAN MATEO C BL LO CRYSTAL SP RES NR SAN MATEO CAUSGS gauge · California · 3 ft³/s63°F20 mi10 hrs ago
- PILARCITOS C BL STONE DAM NR HILLSBOROUGH CAUSGS gauge · California · 2 ft³/s60°F20 mi11 hrs ago
- 68°F20 mi11 hrs ago
- SUISUN BAY A BENICIA BRIDGE NR BENICIA CAUSGS gauge · California68°F22 mi11 hrs ago
Nearest swimmable spots
Rated, photographed water destinations within 25 miles — pair one with the nearest sensor reading above before you go.
4.6(131,806)PIER 39
Bustling bayside pier featuring scenic views, sea lion sightings, eateries, shops & entertainment.
0.1 mi from your location
4.5(136)South Beach Park
Quaint waterfront park offering grassy areas & benches along with a playground & climbing structure.
2.4 mi from your location
4.8(375)Mile Rock Beach
Remote cove known for the stacked rocks left by visitors & a stone labyrinth above the shore.
5.5 mi from your location
4.7(1,826)Ocean Beach
Serene stretch of coast known for its rough surf, natural beauty & views of the Golden Gate Bridge.
6.5 mi from your location
4.5(1,889)McLaughlin Eastshore State Park State Seashore
Shoreline refuge features tidal marshes, beaches & trails that provide panoramic views of the Bay.
6.8 mi from your location
4.5(4,543)Robert W. Crown Memorial State Beach
This scenic park features a biking trail, plus areas for picnicking, swimming & water sports.
8.1 mi from your location
4.7(741)Thornton State Beach
Established in 1955, this rugged, 58-acre oceanside park features hiking & scenic views.
9.0 mi from your location
4.6(1,883)Alameda Beach
Long, sandy strip with volleyball courts, ending in a bird sanctuary & backed by fast-food places.
9.5 mi from your location
4.7(1,459)Muir Beach
Cove & beach offering hiking trails & an overlook with a picnic area & scenic coastal views.
9.6 mi from your location
4.8(3,447)Muir Beach Overlook
An iconic staircase leads down to this windy point with sweeping views of the ocean & Pacific coast.
10 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.