Two coastal lows bring will rain today and Sunday. Saturday ends up being a nice day in between with some high pressure building briefly. The second coastal storm coming on Sunday drags into Monday bringing rain and cool temperatures. Throughout this period, temperatures will range at least 5ºF below normal. This below normal temperature trend, largely a continuation of this week, looks set to continue well into next week.
Rest of today – high temperatures in the low-50s with cloudy conditions and periods of steady rain off and on for much of the day. Overnight lows in the low-40s with rain winding down and clouds clearing.
Saturday – sunny skies and high pressure should allow temperatures to climb to about 60ºF. Overnight lows in the mid-40s.
Sunday – unfortunately, the dry weather doesn’t last as a second storm moves in for Sunday, bringing yet more rain and cool, cloudy weather. High temperatures topping out only in the low-50s. Overnight lows in the low-40s.
Monday – high temperatures still suppressed in the low-50s as this second storm lifts to the east. Overnight lows in the low-40s. Going into next week, temperature will stay below normal, anywhere between 5-10ºF. Later in the week, it appears a potent, closed 500 mb low will be the culprit for keeping temperatures down (and bringing yet more rain to us)
Climate Prediction Center temperature outlook for Apr 29-May 3, showing below average temperatures continuing to affect much of the northeastern quadrant of the US 
GFS 500 mb temperature, height and winds for 2AM Thursday, Apr 30. A closed 500 mb low is forecast to move over the Great Lakes and southern Ontario – this will be partly responsible for cooler than normal temperatures.