Portsmouth, in Saint John Parish, DM, is home to roughly 3,600 people in the America/Dominica time zone at 15.6°N latitude.
Recent weather here gives a sense of typical conditions: in 2025, Portsmouth recorded a mean annual temperature of 79°F, ranging from 69°F lows in April to 90°F highs in October, with about 54 inches of precipitation across the year.
View historical weather for Portsmouth · More cities in Saint John Parish