September Weather in Erin, United States

Last updated: June 24, 2025

In Erin, United States during September, the average temperature is a warm 23°C (74°F), with daily highs reaching up to 36°C (98°F) and occasional lows of 10°C (51°F). Expect a precipitation total of 112 mm (4.4 in) spread over 8 days, contributing to an average humidity of 75%, making it a pleasantly warm and sometimes humid month.

September Temperature in Erin

In September in Erin, the average temperature is 23°C (74°F), with maximums reaching 36°C (98°F) and minimums dropping as low as 10°C (51°F). This diverse climate makes it an ideal time for travelers to enjoy both warm days and cooler evenings.

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

The chart illustrates September temperature patterns in Erin, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Erin, September typically has an average temperature of 23°C (74°F), with highs reaching up to 36°C (98°F) and lows dropping to around 10°C (51°F).

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

September Precipitation in Erin

In Erin in September, the total precipitation amount is 112 mm (4.4 in) spread over 8 days.

September Precipitation Trends in Erin

The chart displays monthly precipitation patterns in Erin, 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 Erin, September typically receives around 112 mm (4.4 inches) of precipitation spread over approximately 8 days.

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

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Millimeters (mm) Inches (in)

September Humidity in Erin

In Erin in September, humidity is 75%. With an average temperature of 23°C (74°F), this humidity feels like a warm, heavy blanket wrapping around you, making it feel more sweltering than it actually is, which can be quite uncomfortable for traveling.

September Average Humidity in Erin

This chart illustrates the average monthly humidity levels in Erin, 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 Erin is approximately 75%, 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 Erin

In Erin 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 Erin.

Maximum UV Index Levels in Erin for September

The chart shows the monthly maximum UV Index (UVI) for Erin 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 Erin typically reaches 9, which falls under the very high exposure category.

Data source: Erin 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 Erin Compares to Other Months

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

This table compares monthly weather conditions in Erin, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	4°C (40°F)	104 mm (4.1 inches)	86%	moderate
February Weather	7°C (44°F)	175 mm (6.9 inches)	84%	high
March Weather	11°C (53°F)	160 mm (6.3 inches)	84%	high
April Weather	15°C (59°F)	162 mm (6.4 inches)	80%	very high
May Weather	21°C (70°F)	128 mm (5.1 inches)	82%	very high
June Weather	25°C (77°F)	109 mm (4.3 inches)	83%	extreme
July Weather	27°C (81°F)	115 mm (4.5 inches)	79%	extreme
August Weather	26°C (78°F)	117 mm (4.6 inches)	76%	very high
September Weather	23°C (74°F)	112 mm (4.4 inches)	75%	very high
October Weather	17°C (63°F)	128 mm (5.0 inches)	74%	high
November Weather	9°C (49°F)	92 mm (3.6 inches)	85%	moderate
December Weather	7°C (46°F)	132 mm (5.2 inches)	88%	moderate