In summer, the average temperature ranges from 9–18 degrees Celsius (48–64 degrees Fahrenheit). While summer in most parts of the world means hot and dry, the U.K. experiences quite a temperate season with temperatures rarely exceeding 80 degrees F. Rain is still a possibility though, so you'll want to be prepared. Showing: All Year Climate & Weather Averages in Carlisle. Based on weather reports collected during 1985–2015. Summer 2018 in the UK was the equal-second warmest since 1910. Although UK weather is unpredictable, it is rarely extreme. (Weather station: Carlisle, United Kingdom). Summer in the United Kingdom . The tables give the maximum and minimum yearly temperatures based on weather data collected from 1981 to 2010. On occasion, it can reach around 30 degrees Celsius (86 degrees Fahrenheit) in a heatwave. See more current weather × Annual Weather Averages Near Cornwall. Note Winter Average Winters Temps for 1955 don't include Dec 1954 Jan The temperature of the sea in Wales remains very cool, if not cold, even in summer: in August, the temperature of the Atlantic Ocean reaches 16 °C (61 °F). You can jump to a separate table for: Southern England, Northern England, Wales, Scotland and Northern Ireland. Average annual temperatures for cities and towns across the United Kingdom are listed below in degrees Celsius and Fahrenheit. Summer temperature averages range from a high of 81.1 degrees Fahrenheit (27.3 degrees Celsius) in Louisiana and Texas to a low of 52.3 °F (11.3 °C) in Alaska. See more current weather × Annual Weather Averages in Kirkwall (Orkney Islands) Based on weather reports collected during 1985–2015. At the peak of summer, London experiences nearly 17 hours of daylight. The temperatures are state-wide averages calculated from temperatures recorded during the months of June, July and August. (Weather station: Cardinham, United Kingdom). Based on weather reports collected during 2005–2015. (Weather station: Kirkwall Airport, United Kingdom). Annual Weather Averages in London. Averages are for Cardinham, which is 7 miles from Cornwall. Based on weather reports collected during 2005–2015. High Temp: 66 °F. See more current weather × Annual Weather Averages in Carlisle. Seasons: Winter from Dec-Feb, Spring from Mar-May, Summer from June-Aug, Autumn from Sept-Nov. Climate data and weather averages in London. Here are the average water temperatures at Swansea (located on the coast, west of Cardiff). Average daily temperatures in the United Kingdom (UK) 2001-2019 Deviation of mean annual temperature in the United Kingdom (UK) 2001-2019 Monthly mean temperature in UK … Averages Near Cornwall Kingdom ) and Northern Ireland during 1985–2015, Wales, Scotland and Northern Ireland occasion it! During the months of June, July and August Weather reports collected during 1985–2015 below degrees! 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