Saturday is the official start of summer. That day, at 6:51 a.m, the summer solstice occurs in the Northern Hemisphere.
It is the longest day of the year. The timing of the solstice depends on when the sun reaches its farthest point north of the equator, according to www.almanac.com.
After Saturday, days will get shorter as the sun gets progressively lower in the sky until mid December.
As far as the forecast for the first day of summer goes, Weather.com is predicting morning clouds on Saturday, followed by some sunshine and temperatures in the upper 70s.