Mild temperatures will start off the week, with rain and a few chilly nights by the middle of it, according to the National Weather Service.
Sunday will be dry, with a mix of clouds and sun, said Joey Picca, meteorologist with the service's Upton bureau. Highs will be in the low to mid 60s, with a strengthening southern wind bringing slightly cooler air to the South Shore, Picca said.
Temperatures will cool to the mid 50s overnight, with areas of fog that will increase through daybreak on Monday, possibly affecting the morning commute, he said.
Highs on Monday will be in the mid 60s, with dry conditions and continued fog that will intensify in the overnight hours.
Lows on Monday will be in the upper 40s.
A high chance of rain will occur Tuesday, with precipitation that could be heavy at times, Picca said. Highs will be in the mid 50s.
The rain will slowly decrease Tuesday night, with lows dropping into the low to mid 30s, thanks to a cold front, he said.
Wednesday will continue to be chilly, with highs only in the mid to upper 40s -- about 10 degrees below normal for this time of year.
"It's a reminder that we're not fully into the warmer season just yet," Picca said.
Wednesday will be dry, with mostly clear to partly cloudy skies.
Wednesday night's lows will again be in the mid 30s.
Thursday will warm up, with highs in the low 50s, while lows on Thursday will be cool again, in the mid to upper 30s.
Friday will see highs in the mid 50s.