St. Louis Metro Weather Forecast from News 11 Chief Meteorologist, John Fuller – Tonight: Mostly cloudy, rain developing and becoming widespread after 10pm, breezy Wind S 15-25, Low 55. Friday: Periods of rain, colder, Wind NNW 10-20, High 55 early, Low 36. Saturday: Periods of showers, cold, High 43, Low 35. Storm total rainfall 1″ to 3″. Sunday: Mostly cloudy, intermittent lt. rain or drizzle, High 48, Low 38.