With a population of around 10,000, Plymouth sits in Indiana, United States. The city operates in the America/Indiana/Indianapolis time zone.
In 2025, Plymouth recorded an average annual temperature of 51°F — about 1.3°F above the 30-year normal of 49°F. The hottest day reached 93°F in June; the coldest was -5°F in January. Total precipitation was 34 inches (drier than usual). Snowfall totaled 13 inches, below the 65-inch average. The wettest month was April.
View current conditions and forecast for Plymouth · More cities in Indiana