An area of high pressure to the south will help send a south/southwest flow, drawing warmer temperatures for Wednesday and Thursday but first there is a chance of some rain showers tonight. Some locations to the North could see some freezing drizzle as lows will be in the 30s.
Wednesday will be warmer with highs in the 40s north, 40s and 50s south. Temperatures on Thursday will be in the 50s. Some locations could see low 60s southwest. The area of high pressure will slip south and east of the region, blocking an area of low pressure over coastal southeast USA. Eventually this high pressure will shift east and allow the precipitation from this low to be drawn up the coast interacting with an area of low pressure that will track over the western great lakes allowing for periods of rain for Friday and Saturday. More seasonal temperatures arrive Sunday into next week.
Merrimack valley weather 