Boston Weather In October
Boston October Weather sees a average drop of approximately 10°F in temperature from the start of the month to the end, with average daily highs below 70 in the beginning of September and below 60 at the end of the month. Bring at least a light jacket with you if you are visiting Boston in October.
If you want to swim you should book a hotel with an indoor swimming pool. Other outdoor fun is still possible, and can be quite pleasant at times. Rain is always possible, with longer, less violent rainstorms replacing thunderstorms as the norm.