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.
âs climate is mild, temperate and warm, consisting of sunny spring and summer months in which temperatures frequently reach over 30Â°C. Winters on the other hand are wet and windy with average temperatures of around 10ÂºC; the winter season is shorter than the summer season.Lisbon City skyline, Portugal.inters can often be so severe that the barometer dips to low of -15ÂºC. Total annual rainfall in the area averages 743 mm, and the area sees, on average of 123 rainy days per year and 20 days of snow. Although normally the area is relatively wet, the year of 2005 did see.