Waltham Weather Outlook: June 26 – July 4, 2026

A transition to a more typical summer pattern will take place across southern New England over the next week. The period begins with scattered showers and thunderstorms Friday as a cold front crosses the region, with a few storms capable of producing damaging wind gusts. While not everyone will see severe weather, any storm that develops during the afternoon and evening will need to be monitored. A weak disturbance may bring a few showers on Saturday before high pressure builds in, leading to several days of warm, dry weather. Temperatures will steadily climb through early next week, with highs reaching the upper 80s to lower 90s Tuesday and Wednesday. While humidity will increase, the hottest conditions currently appear likely to remain just southwest of the region. Toward the Independence Day holiday, confidence decreases somewhat, but the overall pattern favors continued warm summer weather with only isolated opportunities for afternoon showers or thunderstorms.