Steady rain overnight and early this morning across southwestern Connecticut threatens coastal flooding later today, the National Weather Service warns.

In a Coastal Flood Advisory issued from 11 a.m. to 2 p.m., the weather service says the threat is greatest during the high-tide period -- noontime today.

Otherwise, periodic rain is expected throughout the day, as the temperature rises to a high in the mid-40s. It will be breezy, with an east wind 15 to 20 mph, then becoming southeast 9 to 14 mph in the afternoon. Chance of daytime precipitation is 90 percent, the NWS says.

Showers also are likely tonight, mainly before 7 p.m. The temperature will dip to a low in the mid-30s, with a west wind 3 to 8 mph. Chance of precipitation is 60 percent.

Tomorrow, there is a chance 50 percent chance of showers, with cloudy skies and a high temperature in the upper-40s. By nighttime, there is a lesser chance of showers -- about 30 percent -- as the temperature registers a low in the low-30s.

On Friday, skies will be mostly cloudy, with a high temperature near 45. Nighttime will be partly cloudy, with a low temperature about 30 degrees.

Saturday is expected to be mostly sunny, with a high temperature in the low-40s. Skies will turn mostly cloudy at night, with a low temperature in the mid-20s.

The outlook for Sunday, the weather service says, is partly sunny and temperatures in the 30s.