A significant heat wave is expected this week, with temperatures in the Boston area projected to reach triple digits by the end of the week. A heat wave warning has been issued for most of Massachusetts, with the potential for record-breaking highs, possibly exceeding the 102 degrees recorded on June 24, 2025. This heat wave is caused by a “heat dome” effect, where high pressure holds stagnant, leading to gradually rising temperatures.
The humidity will increase throughout the week, raising the heat index to hazardous levels, especially by Thursday. For outdoor activities, early mornings are recommended to avoid the intense heat later in the day, as temperatures can jump significantly. Morning lows will remain in the 60s and 70s, with daytime highs varying across regions. Overall, the weather forecast indicates mostly sunny conditions with varying temperatures in the 70s to 80s leading up to the extreme heat later in the week.
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