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Heat Dome Returns to Boston Area, Bringing a Midweek Spike in Heat and Humidity

A building upper‑level ridge will push temperatures and dew points higher, producing strong heat‑index values with an elevated chance of storms.

Overview

  • Comfortable, relatively dry sea‑breeze conditions are in place today with highs in the upper 70s to low 80s and dew points in the 50s.
  • Forecast models show a steady warming trend early next week as a heat dome builds and daytime highs climb into the low‑to‑mid 90s at the peak.
  • Humidity will increase during the peak period with dew points near 70 degrees, making temperatures feel several degrees hotter and boosting heat‑index readings into the mid‑to‑upper 90s.
  • The hottest, most humid stretch also carries the main risk of scattered thunderstorms as the unstable air interacts with the heat, so residents should monitor local radar and forecast updates for potential watches or warnings.
  • Temperatures are expected to moderate later in the week back into the 80s, offering relief after this brief but significant heat episode.