Aside from the depths of winter, the climate is relatively mild throughout the year in Middletown, Rhode Island. Average temperatures in the winter range in the upper 20s to low 30s. Average temperatures in the summer range in mid 60s to low 70s. Specifically, average highs during the winter are in the upper 30s to low 40s, with average daily lows in the upper teens to low 20s. During the summer, average highs are in the mid 70s to low 80s; summertime lows average in the upper 50s to low 60s. Precipitation occurs relatively evenly across the year, with rain averaging about 3 to 4 inches a month. Snowfall occurs during the wintertime.

The best time to visit Middletown is during the summer. Temperatures are warm, making it ideal for a trip to the beach. Though you will most likely be among the crowds, if you're looking for prime tanning time, summer at the beach can't be beat. Another excellent time to visit the area is during the autumn when the fall foliage is at its peak. Like many areas among the East Coast, seeing the brilliant colors of autumn leaves is an event that is not to be missed.