With another day of high temperatures and humidity, an air-quality alert has been issued today for southwestern Connecticut.

Skies will be partly sunny as the temperature rises to the upper-80s, according to the National Weather Service, with a south wind 5 to 7 mph.

The air-quality alert is in effect from 11 a.m. to 11 p.m. when state officials warn that the combined effect from the high heat and humidity will likely produce high ground-level ozone readings.

Tonight, there is a slight chance of showers as skies turn mostly cloudy and the temperature dips to the upper-60s.

Tomorrow will be cloudy with a slight showers early, with a chance of thunderstorms as well after 2 p.m. The temperature will rise to the upper-80s. There remains a chance of showers and thunderstorms tomorrow night, and patchy fog will settle in parts of the region after 2 a.m.

Sunday morning will still be foggy in some areas, while a chance of showers and thunderstorms continues throughout the day. The high temperature will be in the mid-80s under mostly cloudy skies. Sunday night will be mostly cloudy, with precipitation still possible. The low overnight temperature will be in the low-70s.

The outlook for Monday, the weather service says, is partly sunny and temperatures in the low-90s.