Saturday Night: Low 72. Scattered showers and thunderstorms possible through about midnight. Winds South 5-7 mph.
Sunday: High 89. Morning patchy fog then mostly sunny with only a 20% chance of a stray shower or storm, mainly south and east of the STL metro area.
Monday (Labor Day): Low 74/High 89. Partly sunny with a 60% chance for scattered heavy storms, particularly from late afternoon through the evening hours. Some of these storms could become severe.