With a population of around 51,200, Plainfield sits in New Jersey, United States. The city operates in the Eastern Time Zone.
In 2025, Plainfield recorded an average annual temperature of 54°F — about 2.0°F below the 30-year normal of 56°F. The hottest day reached 102°F in June; the coldest was 3°F in January. Total precipitation was 41 inches (drier than usual). Snowfall totaled 8 inches, below the 32-inch average. The wettest month was May.
View current conditions and forecast for Plainfield · More cities in New Jersey