Last updated: June 24, 2025
In Chester, United States, the average temperature in September hovers around 17°C (62°F). Expect a range that can dip to a chilly -1°C (31°F) and soar to a warm 31°C (89°F). With 79 mm (3.1 in) of precipitation spread over 9 days, the weather can be quite variable. On top of that, the average humidity sits at a comfortable 72%, making it a month of diverse weather experiences!
In September in Chester, the average temperature is 17°C (62°F) with maximums that can reach 31°C (89°F) and minimums that can dip as low as -1°C (31°F). This wide range of temperatures suggests that travelers should pack accordingly to enjoy their visit to Chester.
In Chester in September, the precipitation amount is 79 mm (3.1 in) spread over 9 days.
In Chester in September humidity is 72%. With an average temperature of 17°C (62°F), this humidity feels like a warm embrace, making it perfect for leisurely strolls but potentially heavy on the skin, prompting travelers to seek shade during midday excursions.
In Chester in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Chester.
UV Risk Categories
Weather in Chester varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Chester, focusing on differences in temperature, rainfall, humidity, and UV levels.
Temperature | Precipitation | Humidity | UV | |
---|---|---|---|---|
January Weather | -5°C (23°F) | 72 mm (2.9 inches) | 89% | moderate |
February Weather | -4°C (26°F) | 85 mm (3.3 inches) | 88% | moderate |
March Weather | 0°C (32°F) | 73 mm (2.9 inches) | 86% | high |
April Weather | 7°C (44°F) | 122 mm (4.8 inches) | 84% | very high |
May Weather | 13°C (56°F) | 85 mm (3.3 inches) | 76% | very high |
June Weather | 19°C (66°F) | 90 mm (3.5 inches) | 72% | very high |
July Weather | 22°C (71°F) | 126 mm (5.0 inches) | 66% | very high |
August Weather | 20°C (69°F) | 92 mm (3.6 inches) | 64% | very high |
September Weather | 17°C (62°F) | 79 mm (3.1 inches) | 72% | high |
October Weather | 10°C (51°F) | 142 mm (5.6 inches) | 81% | high |
November Weather | 2°C (36°F) | 101 mm (4.0 inches) | 87% | moderate |
December Weather | -3°C (27°F) | 104 mm (4.1 inches) | 84% | low |