Water temperature check — USA

Field notes

Readings are assembled from physical monitoring stations rather than estimated from weather data. The page identifies the source network and measurement age for each location, with USGS reporting described as occurring every 15–60 minutes and NOAA buoys typically reporting hourly. Individual entries can add air temperature, recent highs, river flow, and seven-day trends. The homepage also points to a free app covering 12,000+ stations across 80 countries.