Hotter still is the core. In the sun this is thought to be 10 - 20 million degrees. These temperatures are due to the pressure caused by gravity trying to compress the star. It has to be this temperature for fusion of hydrogen to take place. Once fusion starts in a young star this adds to the temperature to ensure that fusion continues.
Weather in Lisbon in September. The average maximum daytime temperature in Lisbon in September is a warm 27Â°C (81Â°F) with low heat & humidity. There are usually 9 hours of bright sunshine each day, which represents 68% of the 12 hours of daylight. The average sea temperature in and around Lisbon in September is 19Â°C (66Â°F). Expect 26mm (1.0 inches) of rainfall across the whole of September with 6 days with some rain falling. Maximum UV levels will be high (6 UV index) at midday when the skies are clear.
This report describes the typical weather at the Portela Airport (Lisbon Airport) (Lisbon, Portugal) weather station over the course of an average year. It is based on the historical records from 1974 to 2012.Earlier records are either unavailable or unreliable.he warm season lasts from June 19 to September 22 with an average daily high temperature above 79AÂ°79Ã¢. F the hottest day of the year Is august, 4 with an average high OFÂ°84a 84Ã¢ f and LOWÂ°Of. 65a 65Ã¢ f the cold Season lasts from November 18 to march 7 with an average daily HIGHÂ°Temperature. below 63a 63Ã¢ f