The National Weather Service (NWS) forecasts suggest that Boston will be colder and more unsettled this week, with temperatures expected to drop into the low 50s and potentially fall into the 40s on Tuesday. The return of clouds and cool temperatures is expected to continue throughout the week, followed by a return of light rain or drizzle, which could occur as early as Tuesday evening. However, the weather is predicted to remain cool heading into the weekend, with high temperatures predicted to be in the low to mid 50s.