Waltham Weather Outlook: Oct. 16–22

Friday brings a high chance of rain midday and overnight to start the weekend. A cold front follows the rain and brings below freezing lows overnight on Saturday and potential for a frosty Sunday morning. The remainder of the week appears dry and seasonable, with highs in the 50s and 60s. There is high confidence in the week’s forecast, though experts are watching coastal weather closely as these systems may change suddenly and bring in a potential for midweek rain.