How hot is the sun? June 30, 2011 by Pamela Landy · Filed Under: Science At its surface, the sun is about 7,640 degrees Fahrenheit. In other words, very hot. In the sun’s interior, temperatures can range above 18 million degrees Fahrenheit. Related PostsIf the moon passes between the earth and the sun every month, why doesn’t it eclipse the sun?Who starred in the 1939 movie Some Like It Hot?When was the hot dog introduced to the U.S.?When was the “hot line” first set up between the chief executives of the U.S. and the U.S.S.R.?How fast does the earth travel around the sun?