Chilly Skies and Biting Breezes: A Cold Mid-Week Forecast for Boston

Winter’s Grip Lingers Over the Hub

Bostonians waking up this Wednesday, March 18, 2026, will find that spring still feels a world away. While the calendar may be inching toward the equinox, today’s weather is firmly rooted in the final gasps of winter. A combination of sub-freezing morning temperatures and persistent westerly winds will make for a brisk commute and a day that struggles to reach the mid-30s.

Morning: A Frosty and Bright Start

The early morning hours began with clear skies and biting cold. Temperatures at dawn hovered around 25°F, though a steady breeze from the west-southwest at 10 to 15 mph made the outdoors feel significantly colder. Wind chill values were reported as low as 17°F in the city center and likely lower in the more exposed coastal areas. Commuters should prepare for icy patches on secondary roads, especially following the recent wind events of earlier this week. Despite the chill, the morning offers the best chance of sunshine before cloud cover begins to thicken toward midday.

Afternoon: Clouds Move In

As we transition into the afternoon, expect the bright morning sun to give way to a mostly cloudy sky. The mercury is forecast to peak at approximately 36°F. While this marks the high for the day, the persistent 12 mph winds from the west will maintain a persistent nip in the air. There is a slight 10% chance of a stray snow flurry as a weak system passes to the north, but no accumulation is expected. Humidity levels will remain low, around 31%, contributing to a very dry, crisp atmosphere across the Greater Boston area.

Evening and Night: Clearing and Cooling

As evening falls, the cloud deck is expected to break, leading to a mostly clear night. This clearing will allow temperatures to drop rapidly once the sun sets. Overnight lows are predicted to bottom out at 21°F, making it another night for heavy coats and heating systems to work overtime. Winds are expected to settle slightly after midnight, though a light breeze will remain.

Wind and Safety Notices

While the High Wind Warnings from earlier in the week have expired, residents should still be mindful of occasional gusts. Early morning observations at Logan International Airport recorded gusts reaching up to 35 mph. While these will taper off throughout the afternoon, unsecured outdoor items should still be checked. No major rain or snow alerts are in effect for today, but the primary hazard remains the unseasonably cold temperatures and the potential for slippery surfaces during the early morning hours.