The best chance of showers & thunderstorms today is along and over the Central & Northern Mountains. They could drift out over the valleys as well, but there's just a slight chance of that along the Wasatch Front.
Late day storms are possible over the next several days. It'll dry out in the south by mid-week, so storms will decline there while they'll become more likely across the north.
SALT LAKE CITY
Monday: Partly cloudy with a 20% chance of showers and thunderstorms in the afternoon. Highs: Mid 80s.
Monday Night: Partly cloudy. Lows: Near 60.
ST. GEORGE
Monday: Becoming partly cloudy. Highs: Upper 90s.
Monday Night: Mostly cloudy. Lows: Upper 60s.