Sunny, hot and humid conditions today in southwestern Connecticut have triggered an air-quality alert for the region a second day in a row.

The daytime high temperature is expected to hit about 90 degrees, according to the National Weather Service, and combined with high humidity, that will produce unhealthy ozone levels from 11 a.m. to 11 p.m. today.

Tonight will be partly cloudy and the temperature will dip to the low-70s.

Tomorrow will be mostly sunny and the high temperature will be in the upper-80s. There is a slight chance of showers and thunderstorms after 11 p.m. tomorrow night, with a low temperature in the low-70s.

On Sunday, there is a chance of showers and thunderstorms, mainly after 3 p.m., and the NWS warns that some of the storms could be severe, with heavy rain and strong winds. The daytime high temperature will be in the mid-80s. The threat of storms continues as the low temperature registers in the mid-70s, the NWS says.

Monday also may be stormy, with downpours possible. The skies will be cloudy and the high temperature will be in the mid-80s. Monday night will be partly cloudy with a low temperature in the mid-60s.

The outlook for Tuesday, according to the weather service, is mostly sunny and temperatures in the mid-80s.