Scorching temperatures are in store for southwestern Connecticut today, with temperatures soaring into the upper-90s -- and a "heat index" that makes it feel as though it's over 100 degrees.

The National Weather Service has issued a "heat advisory" for the region from noon to 6 p.m. because of the extremely hot temperatures, and the state has issued an "air quality alert" because the combined high heat and humidity could contribute to unhealthy levels of ozone.

Skies will be sunny most of the day, the NWS adds, with a light west wind about 6 to 11 mph.

Tonight, there is a chance of showers and thunderstorms, mainly after 9 p.m. Some of the storms could produce downpours and gusty winds, the NWS warns. The temperature will dip to a low about 70 degrees.

On Sunday, there is a slight chance of showers and thunderstorms before 1 p.m. Skies will be partly sunny with a high temperature in the upper-80s. Nighttime will be partly cloudy and a low temperature in the low-60s.

Monday will be mostly sunny with temperatures in the low-80s. Night skies will be partly cloudy and low temperatures in the mid-60s.

The outlook for Tuesday, the weather service says, is mostly sunny and temperatures about 80 degrees.