Weather
Eastern Massachusetts Frost Alert: Boston Nears 34° Oct 27-28
Boston, MA – A sharp change in temperatures is expected to bring patchy frost to the Boston area by early Wednesday, Oct. 28, as a stretch of mild autumn weather gives way to colder nighttime conditio
By Evan Cross · 2026-10-25T08:35:36.905Z
Boston, MA – A sharp change in temperatures is expected to bring patchy frost to the Boston area by early Wednesday, Oct. 28, as a stretch of mild autumn weather gives way to colder nighttime conditions. After afternoon temperatures reach approximately 67 degrees Monday, the National Weather Service expects readings to fall to around 34 degrees Tuesday night, creating a 33 degree difference between Monday's daytime high and the midweek nighttime low. The colder weather could affect sensitive outdoor vegetation, particularly in neighborhoods where temperatures fall closest to freezing.
According to the National Weather Service forecast for Boston, patchy frost is expected to develop after 2 a.m. Wednesday, following a mostly clear Tuesday night with temperatures near 34 degrees. Frost may linger until approximately 9 a.m. Wednesday before sunshine helps temperatures recover into the middle 50s. The forecast identifies a localized frost threat rather than a widespread hard freeze, and the supplied information does not establish an active Frost Advisory for Boston.
Temperatures Drop 33 Degrees Before Wednesday Morning The cooling trend begins after a relatively comfortable start to the week. Monday, Oct. 26, is expected to bring sunny skies and temperatures reaching approximately 67 degrees, with west winds of 5 to 7 mph. Monday night remains mostly clear, with temperatures dropping to around 44 degrees as north winds increase slightly.
Tuesday, Oct. 27, brings a more noticeable change, with afternoon temperatures reaching only 53 degrees despite continued sunshine. North winds of 5 to 8 mph accompany the cooler conditions, keeping the afternoon approximately 14 degrees colder than Monday. By late Tuesday night, temperatures are expected to approach 34 degrees, allowing patchy frost to develop in some locations.
The 33 degree difference between Monday's high and Tuesday night's low occurs over more than a full day. It should not be interpreted as a sudden temperature collapse within a few hours. Nevertheless, the transition represents a meaningful late October cooling period for residents accustomed to the relatively mild afternoons expected earlier in the week.
Frost Could Affect Gardens and Early Morning Activities Patchy frost can develop when surfaces cool sufficiently for moisture to freeze, even when official air temperatures remain slightly above 32 degrees. The National Weather Service forecast specifically identifies frost after 2 a.m. Wednesday and continuing before 9 a.m., making the early morning hours the primary period of concern.
Residents with sensitive flowers, vegetables and container plants should consider protective measures before Tuesday evening. Moving vulnerable plants indoors or covering exposed vegetation may help limit damage. The forecast does not indicate widespread freezing rain, accumulating snow or a significant winter storm associated with the colder temperatures.
For commuters traveling Interstate 93, Interstate 90 and Route 1, the supplied forecast does not indicate widespread hazardous road conditions. However, residents traveling through colder suburban neighborhoods should remain aware that localized temperatures may differ from readings at Boston Logan International Airport. Frost on grass or exposed surfaces does not automatically mean roads will become icy.
Sunshine Returns as Temperatures Rebound Thursday Wednesday, Oct. 28, begins with patchy frost before 9 a.m., followed by sunny skies and an afternoon high near 55 degrees. Light and variable winds should accompany the improving conditions, while Wednesday night becomes mostly clear with temperatures falling to approximately 41 degrees.
Thursday, Oct. 29, brings a substantial improvement, with sunshine and temperatures climbing to around 65 degrees. Southwest winds of 7 to 11 mph could produce gusts as high as 22 mph, making conditions breezier than earlier in the week. Friday continues the warmer pattern with sunshine and a high near 68 degrees.
By Saturday, Oct. 31, temperatures are expected to reach approximately 63 degrees under mostly sunny skies. The forecast suggests relatively favorable daytime conditions for Halloween activities, although a specific Saturday evening low is not provided.
Are you preparing to protect outdoor plants from Wednesday morning's frost, or are you looking forward to Boston's warmer temperatures returning later in the week?
Five Day Weather Outlook Sunday 10/25: Sunny skies are expected across Boston, with an afternoon high near 64 degrees and light, variable winds; clear conditions follow Sunday night, with temperatures falling to approximately 41 degrees and southwest winds around 5 mph.
Monday 10/26: Sunshine continues with temperatures reaching approximately 67 degrees and west winds of 5 to 7 mph; Monday night remains mostly clear, with temperatures falling to around 44 degrees and north winds of 5 to 7 mph.
Tuesday 10/27: Sunny skies accompany a noticeably cooler afternoon high near 53 degrees, with north winds of 5 to 8 mph; Tuesday night turns clear, with temperatures falling to around 34 degrees and patchy frost developing after 2 a.m.
Wednesday 10/28: Patchy frost is expected before 9 a.m., followed by sunny skies and temperatures reaching approximately 55 degrees; Wednesday night becomes mostly clear, with a low around 41 degrees and southwest winds near 5 mph.
Thursday 10/29: Sunshine returns as temperatures climb to approximately 65 degrees, with southwest winds of 7 to 11 mph and gusts potentially reaching 22 mph; Thursday night remains mostly clear, with temperatures falling to around 51 degrees.
Extended Weather Outlook Friday, Oct. 30, is expected to bring sunshine and temperatures reaching approximately 68 degrees, followed by mostly clear skies and a low near 47 degrees.
Saturday, Oct. 31, should remain mostly sunny, with temperatures reaching approximately 63 degrees and light winds becoming easterly at 5 to 7 mph during the morning.
The supplied National Weather Service forecast does not establish reliable temperature or precipitation trends for the full six to 10 day period beyond these dates.