The warmest water temperature in Loch Ness in August is 18°C/64.4°F, and the coldest water temperature in August is 13°C/55.4°F. As you are low in the water, it can be difficult for other water users to spot you. Refer to our detailed weather forecasts for this information. The measurements for the water temperature in Garelochhead, Scotland are provided by the daily satellite readings provided by the NOAA. Always be guided by local advice. Travel guide and advices. ... Company registration: 238 258 (Scotland) Vat No. The temperatures given are the sea surface temperature (SST) which is most relevant to recreational users. Loch Morar is the deepest loch – at 310m; Loch Ness is the largest loch by volume – it contains more water (7,452 million cubic metres) than all English and Welsh lakes together; Scotland’s many small lochs and lochans are found: mainly in the western and northern Highlands; in corries and in moraines – e.g. The water temperature in Loch Long is extremely cold. Weather phenomena recorded in previous years in Loch Ness ☃ Water Temperature in localities in Loch Ness ☀ Weather forecast for Loch Ness in July ☔. Milarrochy Bay on East Loch Lomond is a popular site. Average water temperature in Loch Ness in August is 15.7°C/60.3°F and therefore is not suitable for comfortable swimming. Read an overview of the climate. Air temperature, wind-chill and sunshine should also be considered before deciding on the kind of wetsuit needed to stay warm when surfing at Loch Ness (Noordhoek). Weather in Loch Ness in July 2020. Temperature of water and air, precipitation, amount of days with rain and advice on the best time to visit Loch Ness. The average water temperature for Loch Ness in August is 13.5c ( 56.f ), though as others have said, there are other hazards to consider before attempting a swim in it. Weather report for the Swimming Lake Loch Lomond: Get info on current weather and sun hours as well as water temperature and 5 day forecast! Know the sea water temperature in Loch Nedd and the hourly evolution for the next few days Tides4fishing cookies are used to personalise content and ads, save your recent fishing sites and remember your display settings. We recommend wearing a 5/4 mm to 5/4/3 mm full sealed and taped suit with boots, gloves and a hood particularly if you plan to be in the sea for extended periods of time. Please note: These are general guidelines based on today's average water temperature of 11°C in Loch Long. SWIMMING AND WATER TEMPERATURE. Luss Pier: G83 8NZ Loch Lomond Leisure at Luss Pier Luss Beach: G83 8PA Loch Lomond Leisure at Luss Beach Rowardennan: G63 0AR Loch Lomond Leisure at Rowardennan So always wear a brightly coloured swim cap and, if possible, use a swim safety device – these are brightly coloured inflatable bags which you can tow behind you whilst swimming. Offshore winds cause colder deep water to replace surface water that has been warmed by the sun. 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