An area of high pressure east of New England will provide fair weather and seasonable temperatures across the region Wednesday.
High-altitude clouds will skew sunny skies as the day progresses in response to an increasing southerly return flow of warmer and more humid air.
Highs top off in the mid to upper 70s Wednesday with Boston-Metro and Merrimack Valley locales touching 80 degrees.
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Clouds continue to build and lower into the overnight as higher dew points filter into New England. Showers increase ahead of an approaching area of low pressure moving in from the Great Lakes, reaching western areas between 8 or 9 p.m. and the coast around or after midnight. Low temperatures will hover right around the low to mid 60s.
Thursday features tropical rains and scattered thunderstorms as a bulk of warm and humid air mass moves across the region.
Any showers could contain downpours that result in urban and poor drainage flooding. There is also the risk of some damaging winds in stronger thunderstorms. A cold front treks across New England Thursday night, with not much in the way of relief.
Highs reach into the mid-to-upper 70s.
Friday begins a stretch of very warm temperatures, resulting in the summer’s first heat wave into next week. Expect drier and less humid air behind the cold frontal passage.
An atmospheric disturbance may bring some clouds and scattered showers to the North Country. Building high pressure, west winds and a near-July sun angle will result in high temperatures cresting into the mid to upper 80s with a few valley and metro locations reaching 90 degrees.
Looking ahead to the weekend, summer solstice heat settles in across New England. Dominating high pressure coupled with warm air mass and west flow will result in the likely first day of the heat wave, with highs reaching into the low 90s inland, 80s at the coast where sea breezes develop. Abundant sunshine develops by Sunday with widespread 90-degree temperatures and summer-time sea breezes.
We're expecting highs to be 2 to 3 degrees warmer than Saturday – Day 2 of heat wave. Monday will feature the continued warm stretch with another day of highs in the 90s inland, 70s and 80s at the coast - Day 3 of heat wave.
We will have to closely watch an approaching cold front for a chance of showers and thunderstorms across western and central areas. Cooler temperatures move in by the middle of week on the exclusive Early Warning Weather 10-Day Forecast on NBC10 Boston and necn.