The calendar shows that Monday is the last day of spring. But the thermometer is going to look like it’s the dog days of summer.
Skies will start off mostly sunny but will become increasingly cloudy throughout the day with a high near 95, according to the National Weather Service. The heat index could reach 103.
Skies will be mostly cloudy with a 20 percent chance of thunderstorms. The low will be 72. There is a possibility storms could become severe with damaging winds and hail. The most likely time for storms is after 10 p.m.
The temperature will be cooler Tuesday. But the chance of rain will go up. The high will be 87, which is about the normal temperature for this time of year in the St. Louis metropolitan area. The chance of rain is 40 percent.
A 40 percent chance of storms remains in the forecast for Tuesday night when the low will be 72.
The break from the heat won’t last with a high of 96 expected Wednesday.
There is a 30 percent chance of rain with the best chance of showers and thunderstorms coming before 1 p.m.
Wednesday night, it will be partly cloudy with a low of 76.