Monmouth, in Maine, United States, is home to roughly 3,900 people in the Eastern Time Zone at 44.2°N latitude.
In 2025, Monmouth recorded an average annual temperature of 46°F. The hottest temperatures reached 96°F in June; the coolest were -10°F in January. Total precipitation for the year was 38 inches, with the wettest month being May. Snowfall for the year totaled approximately 21 inches.
View current conditions and forecast for Monmouth · More cities in Maine