September Weather in Erie, United States

Last updated: June 24, 2025

In Erie, United States, the average temperature in September hovers around 23°C (74°F), with extremes ranging from a chilly 7°C (45°F) to a warm 34°C (94°F). Expect about 82 mm (3.2 in) of precipitation spread across 7 days, and a comfortable average humidity level of 67%. Enjoy the pleasant weather as you explore this beautiful destination!

September Temperature in Erie

In September, in Erie, the average temperature is 23°C (74°F). The maximum can reach 34°C (94°F), and the minimum can be as low as 7°C (45°F). This makes Erie an ideal destination for travelers seeking a mix of warm days and cooler nights.

September Weather in Erie: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Erie, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Erie, September typically has an average temperature of 23°C (74°F), with highs reaching up to 34°C (94°F) and lows dropping to around 7°C (45°F).

Data source: Temperature data for Erie generated using information from the Copernicus Climate Change Service.

September Precipitation in Erie

In Erie in September, the precipitation amount is 82 mm (3.2 in) over the course of 7 days.

September Precipitation Trends in Erie

The chart displays monthly precipitation patterns in Erie, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Erie, September typically receives around 82 mm (3.2 inches) of precipitation spread over approximately 7 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in Erie

In Erie in September humidity is 67%. With an average temperature of 23°C (74°F), this humidity feels like a warm embrace, making outdoor exploration pleasant yet slightly sticky, perfect for leisurely strolls but requiring occasional breaks for hydration.

September Average Humidity in Erie

This chart illustrates the average monthly humidity levels in Erie, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Erie is approximately 67%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Erie

In Erie in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Erie.

Maximum UV Index Levels in Erie for September

The chart shows the monthly maximum UV Index (UVI) for Erie in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Erie typically reaches 9, which falls under the very high exposure category.

Data source: Erie September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How September Weather in Erie Compares to Other Months

Weather in Erie varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Erie, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Erie, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	2°C (36°F)	62 mm (2.4 inches)	77%	moderate
February Weather	3°C (37°F)	58 mm (2.3 inches)	76%	moderate
March Weather	10°C (50°F)	113 mm (4.4 inches)	71%	high
April Weather	14°C (57°F)	114 mm (4.5 inches)	73%	very high
May Weather	20°C (68°F)	230 mm (9.1 inches)	83%	very high
June Weather	26°C (78°F)	108 mm (4.2 inches)	83%	extreme
July Weather	27°C (81°F)	104 mm (4.1 inches)	81%	extreme
August Weather	26°C (79°F)	126 mm (5.0 inches)	73%	very high
September Weather	23°C (74°F)	82 mm (3.2 inches)	67%	very high
October Weather	15°C (60°F)	133 mm (5.2 inches)	72%	high
November Weather	8°C (47°F)	43 mm (1.7 inches)	82%	moderate
December Weather	5°C (42°F)	35 mm (1.4 inches)	85%	moderate