Boston woke up Saturday, May 16, 2026, to cool, mostly clear skies and pockets of patchy fog in the usual low-lying spots. Morning temperatures sat in the upper 40s to low 50s but will climb quickly as sunshine takes over, with afternoon highs expected to reach the low 70s across the city. A brisk southwest wind this afternoon could take a bit of the edge off the warmth near the waterfront.
Afternoon Sunshine and Gusty Southwest Winds
Forecasters expect sunshine to hold through the afternoon with a high near 71°F and southwest winds around 8 to 14 mph, with gusts possibly pushing into the 20s. That steady southwest flow will favor warmer conditions in inland neighborhoods compared with the immediate coast. Mariners should note that Small Craft Advisories remain in effect on many local waters because of 4 to 7 ft seas and elevated winds; plan accordingly, according to the National Weather Service.
Tonight Into Sunday
Tonight looks partly cloudy with a low near 58°F and a slight chance, around 20 percent, of a brief rain shower before dawn. Sunday trends sunnier and warmer, with the high near 76°F and west winds keeping interior spots the mildest while the Cape and Islands run cooler. If you are heading to a coastal event, especially early in the day, keep in mind that ocean influence can hold temperatures down right along the shore.
Midweek Heat and a Storm Watch
Early next week is set for a sharp warm up, with highs climbing into the 80s Monday and Tuesday and some inland locations possibly flirting with 90°F on Tuesday or Wednesday. That unusually warm stretch raises the odds for stronger thunderstorms by Tuesday and a potentially greater severe weather threat on Wednesday. The timing of an approaching cold front will determine where any storms fire up, according to the NWS forecast discussion. If you have midweek outdoor plans, it is worth keeping an eye on updated forecasts and having a backup plan for both heat and storms.
Plan Ahead
For now, the weekend looks broadly pleasant. Layers for the cool morning and a windbreaker for the gusty afternoon should cover most situations. Boaters and waterfront visitors should respect posted Small Craft Advisories and the elevated seas. If your plans stretch into Tuesday or Wednesday, check in with local updates, since conditions could change quickly as heat and storms move into the picture.
