Waltham Weather Outlook: April 25 – May 2, 2026

A cool, gray stretch kicks off the period as onshore flow and a nearby coastal low bring clouds and occasional showers, especially Sunday into early Monday. There is still some uncertainty on how impactful that system becomes, but expect at least a chilly, damp feel at times. Conditions improve early to midweek with drier weather and a gradual warming trend. By late week, the pattern turns a bit more unsettled again with increasing chances for showers toward Thursday and Friday.