After several warm and sunny days in the aftermath Tropic Storm Irene, the Labor Day weekend in southwestern Connecticut threatens to bring the summer season to a rainy end.

Skies this morning will be partly sunny, but the National Weather Service says there is a slight chance of showers and thunderstorms after 3 p.m. The daytime high temperature will be about 80 degrees and west winds will be between 6 and 10 mph.

There remains a slight chance of showers and thunderstorms overnight, with patchy fog moving in. The temperature will dip to a low of around 68 degrees.

Tomorrow brings a chance of showers and thunderstorms after 3 p.m. Otherwise, skies will be partly sunny, with a high near 82, the NWS says. There will be a south wind between 7 and 13 mph. Rain remains a slight possibility tomorrow night, with a low around 69 degrees.

Precipitation is an increasingly strong element in the forecast for Monday, Labor Day -- in fact, the NWS has issued a "hazardous weather" warning for Monday night and early Tuesday because of the possibility of heavy rain.

The holiday's daytime high temperature is likely to rise to about 80 degrees under mostly cloudy skies. There will be a south wind of up to 15 mph.

The likelihood of heavy rain, according to the weather service, arrives Monday night and continues early Tuesday as a slow-moving cold front with tropical moisture moves into the area. There could be some flooding of streets and streams, the NWS warns.

Rain is likely for much of Tuesday under cloudy skies, according to the NWS.