High pressure has slowly progressed to the east of Missouri, but it's still dominating the weather over the Midwest/Great Lakes region, keeping us cool and dry Thursday.
An upper level wave will pass to our south Thursday night and Friday, bringing rain to far southern Missouri. It's unlikely that any of Mid-Missouri will get rain from that system.
Overnight lows will remain in the upper 50s and lower 60s Thursday night, but temperatures will be on the increase by Saturday as southerly winds build in, and warm, moist air takes hold later in the weekend.
Humidity returns early next week, with the dew points creeping up as well as the temperatures as an upper level ridge builds over the Plains. That will allow our temperatures to climb into the 90s with the heat index in the upper 90s. Spotty rain chances return to the forecast for Monday night into mid-next week.