Waltham Weather Outlook: April 18 – April 25, 2026

A sharp cooldown arrives this weekend and especially early next week as a strong cold front sweeps through on Sunday. Sunday looks wet at times with widespread showers, followed by a much colder stretch Monday and Tuesday that may feature frost during the mornings. Temperatures gradually rebound later in the week with more seasonable spring weather returning by Thursday and Friday. Overall, outside of Sunday and perhaps a few brief showers around Wednesday, much of the period is dry.