DAYS 1-5 (MARCH 16-20)
A chilly and dry start to the week courtesy Canadian high pressure. St. Patrick’s Day will feature weather you would often see in Ireland, chilly and damp with some light rain, which may start as snow for portions of northern MA and southern NH but with no accumulation. Another Canadian high brings fair and seasonably chilly weather back for Wednesday. Cancel the quick warm-up for Thursday as we stay on the colder side of the boundary as another wave of low pressure moves west to east across the region, and this one may start as snow for more of the region, with even some accumulation possible especially north and west of Boston, but eventually will end up as a rain event before ending and moving away. We will welcome the official start of spring that night, and the first full day of spring on Friday will be significantly warmer, but will feature a rain shower chance as low pressure heads through the Great Lakes and down the St. Lawrence Valley.
TODAY: Sunshine followed by increasing high clouds. Highs 35-42. Wind N up to 10 MPH.
TONIGHT: Clouds thicken and lower. Lows 27-34. Wind E under 10 MPH.
TUESDAY: Cloudy. Periods of light rain, but may start as snow and/or mix anywhere north of I-90 and especially southern NH. No accumulation of snow expected. Highs 42-49. Wind SE 5-15 MPH.
TUESDAY NIGHT: Clearing. Lows 28-35. Wind variable becoming NW 5-15 MPH.
WEDNESDAY: Sun and passing clouds. Highs 38-45. Wind NW 10-20 MPH.
WEDNESDAY NIGHT: Clouding over. Lows 25-32. Wind N up to 10 MPH.
THURSDAY: Cloudy. Snow arriving except rain/mix South Coast, with minor accumulation possible, then changing to rain in all locations. Highs 43-50. Wind NE 5-15 MPH shifting to SE.
THURSDAY NIGHT: Mostly cloudy. Temperatures steady 43-50 evening, rising into the 50s overnight. Wind SE up to 10 MPH evening, SW 10-20 MPH overnight.
FRIDAY: Mostly cloudy. Chance of rain showers. Highs 63-70. Wind SW 15-25 MPH.
DAYS 6-10 (MARCH 21-25)
Low pressure departs, high pressure moves in, bringing drier but colder weather for the first full weekend of spring March 21-22. Probably windy March 21 with passing fair weather clouds, and less windy March 22 but an increasing in high and mid level clouds may occur then. Unsettled weather potential March 23-24 with fair weather returning at the end of the period, based on projecting timing of systems. Continued fairly low confidence so this outlook will likely be tweaked significantly if needed.
DAYS 11-15 (MARCH 26-30)
Look for drier weather much of this period, temperatures trending to above normal, but still a low confidence forecast at this point.