Boston is trading in its gray, drizzly morning for a far rowdier afternoon on Thursday, June 18. Light rain around Logan and temperatures in the mid-60s are expected to ramp up into a gusty, unsettled stretch, with showers filling in and thunderstorms becoming more likely later in the day. The high should land near 77°F, and the strongest storms could pack damaging wind gusts and brief, heavy downpours from mid-afternoon into the early evening commute.
Afternoon Gusts And Storm Timing
Southerly winds are set to crank up into the afternoon, with sustained speeds generally in the teens and gusts that could hit about 39 mph over land, even stronger over more exposed shoreline spots. The National Weather Service has tagged the region with a modest severe risk (level 2 of 5), with the focus west of I-95, although a stronger storm could pop up just about anywhere from roughly noon through about 9 p.m.
Out on the water, coastal zones are under Gale Warnings and several nearshore areas carry Small Craft Advisories. Mariners and harbor users should expect rough seas and frequent strong gusts, and anything light or unsecured along the waterfront should be tied down before the worst of the weather rolls in.
How This Affects Plans
If you are eyeing Juneteenth events for Friday, the weather is planning to cooperate. Friday, June 19 should be mostly sunny with a high near 80 and gusty west winds, and Saturday also looks sunny and dry. Tonight’s low will settle in the low 60s, with any lingering showers tapering off by early evening.
For outdoor plans this afternoon, it is worth having a quick indoor backup ready to go. Secure canopies, tents, and any loose gear before the stronger southerly wind gusts arrive so you are not chasing them down the block.
Stay Prepared
Keep phones charged in case storms knock things around, build in extra travel time if you are on the road during heavier downpours, and skip standing under weak or dead tree limbs when a gusty cell moves through. Coastal residents and boaters should check local harbor advisories and this earlier look at the week’s swings from heat to showers for recent context on how the pattern has been behaving. If conditions go downhill quickly, follow local emergency and transit alerts before heading out.
