Norristown, in Pennsylvania, United States, is home to roughly 34,400 people in the Eastern Time Zone at 40.1°N latitude.
In 2025, Norristown recorded an average annual temperature of 54°F — about 2.1°F below the 30-year normal of 56°F. The hottest day reached 101°F in June; the coldest was 1°F in January. Total precipitation was 38 inches (drier than usual). The wettest month was May.
View current conditions and forecast for Norristown · More cities in Pennsylvania