A flood advisory is now in effect for Fairfield and the rest of southwestern Connecticut at midday as a sustained downpour buffets the region.

The National Weather Service says that between 1 and 2 inches of rain has drenched the area so far today, and at least another inch is in the immediate offing.

Runoff from the rain, which began falling early this morning, is expected to trigger flooding on streets, low-lying areas and underpasses, the NWS warns.

The flood advisory is in addition to a "hazardous weather outlook" issued earlier by the weather service, which warns of periodic downpours -- as well as possible thunderstorms -- and gusty winds throughout the day.

Today's daytime high temperature is expected to rise to about 70 degrees, with a southeast wind 8 to 16 mph.

Rain, and possible thunderstorms, are also possible tonight as temperatures dip to the mid-50s with a north wind around 6 mph.

Tomorrow, there is a chance of showers, mainly before noon. Skies will be mostly cloudy, with a high temperature in the upper-60s. Chance of precipitation is rated at 30 percent by the NWS. There is a slight chance of showers tomorrow night, as the temperature registers a low in the low-50s. The chance of precipitation is 20 percent.

On Sunday, precipitation is again possible under cloudy skies as the temperature rises to a daytime high of about 70 degrees. Chance of precipitation is 40 percent. There remains a chance of showers Sunday night with a low temperature in the upper-50s. Chance of precipitation is 40 percent.

The outlook for Monday, according to the weather service, is partly sunny skies and temperatures about 70 degrees.