DAYS 1-5 (MAY 11-15)

A cold front moving offshore holds a blanket of clouds over much of our region to start today out, including a ribbon of rainfall over Cape Cod, Martha’s Vineyard, and Nantucket, which will move out by about mid morning. A clearing trend will ensue and this afternoon will turn out pretty decent overall. High pressure builds in for tonight and Tuesday, but an upper level trough provides cold air aloft which will trigger diurnal cloud development to some extent this afternoon and more so on Tuesday, limiting the sun. Surface high pressure slides off the Mid Atlantic Coast by midweek as another upper low arrives from the west. The surface low associated with this system initially moves into the Great Lakes and will send its warm front in our direction Wednesday, which will feature a lot of cloud cover and the chance of some rainfall, though this may struggle to produce much with dry air in place initially. The upper level system will help redevelop low pressure to the south producing wetter weather on Thursday, as it stands now. This system will move far enough east on Friday that we break out of the heavy overcast but keep a lot of clouds and the chance of a shower around. Temperatures run near to below normal through this period.

TODAY: Cloudy start with rain ending Cape Cod / Islands. Clearing trend follows with increasing sunshine. Highs 59-66. Wind N to NW 5-15 MPH.

TONIGHT: Mostly clear. Lows 40-47. Wind NW 5-15 MPH.

TUESDAY: Sunny start, then a sun / cloud mix. Highs 58-65. Wind NW to W 5-15 MPH.

TUESDAY NIGHT: Partly to mostly cloudy. Lows 43-50. Wind variable up to 10 MPH.

WEDNESDAY: Mostly cloudy. Chance of rain. Highs 55-62 occurring by midday then may turn cooler especially coastal areas. Wind variable to E up to 10 MPH shifting to SE 5-15 MPH.

WEDNESDAY NIGHT / THURSDAY: Mostly cloudy. Showers likely. Lows 48-55. Highs 55-62. Wind SE to S 5-15 MPH, higher gusts.

THURSDAY NIGHT: Mostly cloudy. Lingering showers. Patchy fog. Lows 46-53. Wind variable to N up to 10 MPH.

FRIDAY: Variably cloudy. Chance of showers. Highs 58-65. Wind N to NW 5-15 MPH.

DAYS 6-10 (MAY 16-20)

May 16-17 weekend features dry weather and a warming trend as upper level low pressure departs to the east and high pressure builds in – cloud/sun mix and coolest Saturday, more sunshine and warmest Sunday. Milder pattern at least the early part of next week (May 18-20) but watching for a cold front and a shower / t-storm chance by the end of the period after fair weather to start. Too far in future for details.

DAYS 11-15 (MAY 21-25)

Pattern looks less blocked and more progressive with some up and down temps but overall milder to warmer with limited wet weather chances.