A surface high pressure system over the Canadian Maritime which has been dominating our weather with fair skies and seasonable temperatures for the past few days will continue to drift slowly eastward. We will remain under its influence for an additional few days, with dry and tranquil early September weather. A series of weak surface low pressure systems along a stalled frontal boundary, will move by to our south, off the Mid-Atlantic coast over the next few days. The northern edge of their cloud shield will waver back and forth, close to Berkshire County. As a result, cloudiness will be variable and difficult to forecast over the county. However, their precipitation shield will remain well to our south so we will remain dry.

As mentioned last week, a deep trough in the jet stream wave pattern over central and western Canada will propagate south and eastward over the northern tier of the U.S. over the next several days. A strong cold front at the leading edge of the trough should finally reach Berkshire County late Thursday afternoon or Thursday night. A round of showers and/or thunderstorms is likely with the frontal passage and then temperatures will drop below average from Friday, through next weekend and into the following week as the unseasonably cold air within the core of the trough (the origin of this air mass is northern Canada, where cold air is starting to amass) nudges eastward. The coldest of the air will stay to our north and west. However, daytime temperatures should still struggle to get past the low to mid 60s for several days. It is likely to be dry for most of this period (Friday into early the following week) as surface high pressure builds in slowly behind the front.

Monday Night

Mostly clear and cool.

Low temperatures in the mid to upper 40s.

Light east-southeasterly winds this evening, becoming calm after midnight.

Tuesday

Partly cloudy with seasonable temperatures.

High temperatures near 70 in Adams, North Adams, Williamstown, Pittsfield, Lee and Stockbridge; low 70s in Great Barrington and Sheffield; and mid to upper 60s over the elevated terrain.

East-southeasterly winds at 5-10 mph.

Tuesday Night

Partly cloudy and not quite as cool.

Low temperatures in the low 50s.

Light east-southeasterly winds.

Wednesday

Partly cloudy and slightly milder.

High temperatures in the low 70s in Pittsfield, Adams, North Adams, Williamstown, Lee and Stockbridge; low to mid 70s in Great Barrington and Sheffield and; upper 60s to near 70 over the elevated terrain.

East-southeasterly winds at 5-10 mph.