Weather Update: SATURDAY JULY 18, 2026
WDEF-TV News 12 Tennessee River Valley weather forecast Overnight: Early showers / thunderstorms. Mostly clear / hazy, humid. Lows: low 70's. Winds: near calm. Saturday: Mostly sunny, hot, humid. Scattered showers & thunderstorms. Highs: low 90's. Heat index: low 100's.…