![]() Hot and cold water are relative, however, even in the summer, prolonged immersion in water temperatures below 70° Fahrenheit can produce hypothermia. This can be caused by a persistent offshore wind blowing the warmer surface waters away from the shore. It could be due to a phenomenon known as upwelling, which occurs when displaced surface waters are replaced (upwelled) by colder, deeper waters. Why is the water at the beach sometimes cold on warm summer days? Yes, nearshore water temperatures are more susceptible to the influence of river runoff, higher cooling and heating rates, continental air masses, near-shore ocean currents, and upwelling effects. Can water temperatures differ between nearshore and offshore sites at the same latitude? There's no real optimal temperature, but many people feel “comfortable” swimming in water that is 70° to 78° Fahrenheit. Please note that some stations have been operating for decades, while others are newer.įrequently Asked Questions What is the best water temperature for swimming in the ocean? Because observations may vary with the station's status, a weighted-average method was used, based on the number of temperature observations available in a given month. * All of the historical data available for each station was used to calculate the water temperature averages listed in the "Table of Monthly Averages". * When viewing the OISST layer, note that this is a daily average sea surface temperature and not real-time water temperature. * Use the near real-time water temperature data with discretion ~ may contain errors. It is a blended SST file of buoy, ship, Argo, and satellite observations. Daily Averaged Sea Surface Temperature (SST) is from NOAA NCEI’s 1/4° Daily Optimum Interpolation Sea Surface Temperature (OISST) data set. ![]() Recent and near real-time water temperatures are also from NOAA's National Data Buoy Center ( NDBC) moored buoys.Near real-time temperatures are from NOAA's National Ocean Service (NOS) tidal stations and Physical Oceanographic Real-Time System (PORTS®).
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