Coastal Massachusetts Sees Dramatic Temperature Divide

Inland areas reach 80s and 90s while the coast stays in the 50s due to marine air mass

Apr. 16, 2026 at 7:53pm

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A vast, atmospheric landscape painting depicting the Massachusetts coastline shrouded in thick, moody fog, conveying the overwhelming scale and power of the natural world.The chilly Atlantic Ocean's influence on New England's weather patterns creates dramatic temperature divides across the region.Boston Today

Southern New England is experiencing a significant temperature difference between coastal and inland areas, with the coastline seeing temperatures in the 50s while inland regions reach the 80s and even 90s. This is due to the presence of two distinct air masses - a marine air mass at the coastline and a warmer maritime tropical air mass to the west. As the cooler marine air moves inland, it causes a dramatic temperature drop just a few miles from the ocean.

Why it matters

These 'backdoor cold fronts' are a common weather phenomenon in New England, but the contrast is especially stark in April when the Atlantic is still chilly from winter while inland areas are heating up. This can have major impacts on local weather, agriculture, and energy usage as residents experience vastly different conditions just a short distance apart.

The details

On Thursday, temperatures across the Connecticut River Valley and Western Massachusetts reached the 80s and even 90s, while areas around Boston and Cape Cod only saw highs in the 50s. This is due to the marine air mass moving in from the Atlantic, which carries cooler temperatures and higher humidity. As this air travels inland, it warms up from the land and sun, leading to the dramatic temperature difference.

  • On Thursday afternoon, temperatures ranged from the 40s along the coast to the 80s and 90s inland.
  • This weather pattern is expected to continue into Friday, although the inland temperatures will not be as warm.

The players

NOAA

The National Oceanic and Atmospheric Administration, the scientific agency that monitors weather and climate.

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What’s next

As the frontal system moves offshore, the temperature pattern is expected to return to a more typical mid-April range next week.

The takeaway

The dramatic temperature divide between coastal and inland areas in Southern New England highlights the complex weather patterns that can develop, especially during the transitional spring season. Understanding these regional differences is crucial for residents, businesses, and officials to prepare for and adapt to the variable conditions.