Waltham Weather Outlook: May 9 – May 16, 2026

An unsettled and cooler stretch of weather is expected for much of the upcoming week across Waltham. A widespread rainfall event arrives Saturday, followed by a milder but somewhat more humid Mother’s Day with at least a slight shower risk. Another round of unsettled weather likely develops Sunday night into Monday before cooler-than-normal temperatures settle back into the region through midweek. Conditions trend somewhat drier and more seasonable later in the week.