Boston woke up to sunshine and genuinely decent air this morning, but the break is brief. Temperatures climb into the upper 80s this afternoon, then jump into the mid to upper 90s on Tuesday and Wednesday. Overnight will not offer much relief either, with some spots holding near 80°F Tuesday night, a tough setup for anyone without air conditioning. The worst of it arrives Tuesday, when heat index values are expected to crack 100°F across much of the city.
Today: Sunny, Breezy, Warm
Today stays mostly sunny and warm, with a high near 89°F and a southwest breeze around 6 to 15 mph, with a few gusts into the mid teens in more exposed areas. Any showers that do pop up should be brief and light, and new rainfall totals are projected to stay under a tenth of an inch. Forecast details and the point-and-click outlook are available from the National Weather Service.
Midweek Heat Advisory
A Heat Advisory is posted from 11 a.m. Tuesday, July 14, 2026, through 8 p.m. Wednesday, July 15, 2026, covering much of southern New England. Forecasters expect heat index values to peak around 100 to 103°F during the advisory period, and Tuesday night temperatures are likely to linger near 80°F in many neighborhoods. That combination raises the risk of heat illness for outdoor workers and vulnerable residents. Timing, coverage, and official wording are available in the advisory from the National Weather Service.
Cooling Options And Safety
If you do not have reliable air conditioning, this is the time to make a plan, not to wing it. The City of Boston maintains a map and list of cooling centers, public pools, libraries, and other places to cool down on hot days. Health officials recommend drinking plenty of water, avoiding strenuous outdoor activity during the afternoon peak, and checking on older neighbors and anyone with existing health issues. Full guidance and cooling-center locations can be found at Boston.gov.
Planning And Impacts
Boaters and small-craft operators should keep an eye on the evolving forecast, as southwest winds strengthen Tuesday and seas turn choppy along the southern ocean waters, with advisory-level gusts possible. For outdoor plans of any kind, it is wise to move heavy activity to early morning or evening, keep water handy, and identify an air-conditioned backup spot for the hottest hours. Before heading out, check in with the latest updates and any changes to advisories from the National Weather Service and city resources.
