Waltham Weather Outlook: May 2 – May 9, 2026

A classic spring transition week is ahead for Waltham, featuring a cool and somewhat unsettled weekend, a sharp warmup into near-summer levels by early next week, then a turn back toward more active and occasionally wet weather late week into next weekend. The biggest headline remains the dramatic temperature swing from the low 60s this weekend to the upper 70s by Tuesday and Wednesday.