September Weather in Oelwein, United States

Last updated: June 24, 2025

In September, the average temperature in Oelwein, United States hovers around 18°C (66°F), with minimums dipping to 2°C (36°F) and maximums reaching a warm 33°C (91°F). Expect about 129 mm (5.1 in) of precipitation spread over 11 days, contributing to an average humidity level of 74%. Enjoy the blend of warmth and refreshing rain!

September Temperature in Oelwein

In September in Oelwein, the average temperature is 18°C (66°F). Maximums can reach 33°C (91°F), and minimums can drop as low as 2°C (36°F). This makes it a great time for travelers to experience a diverse range of weather, from warm days to cooler nights.

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

The chart illustrates September temperature patterns in Oelwein, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Oelwein, September typically has an average temperature of 18°C (66°F), with highs reaching up to 33°C (91°F) and lows dropping to around 2°C (36°F).

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

September Precipitation in Oelwein

In Oelwein in September, the precipitation amount is 129 mm (5.1 in) spread over 11 days, indicating a wet period for the area.

September Precipitation Trends in Oelwein

The chart displays monthly precipitation patterns in Oelwein, 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 Oelwein, September typically receives around 129 mm (5.1 inches) of precipitation spread over approximately 11 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 Oelwein

In Oelwein in September humidity is 74%. With an average temperature of 18°C (66°F), this humidity feels like a warm, enveloping blanket, making travel slightly uncomfortable as you navigate through the muggy air, often leaving you yearning for a refreshing breeze.

September Average Humidity in Oelwein

This chart illustrates the average monthly humidity levels in Oelwein, 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 Oelwein is approximately 74%, 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 Oelwein

In Oelwein in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Oelwein.

Maximum UV Index Levels in Oelwein for September

The chart shows the monthly maximum UV Index (UVI) for Oelwein 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 Oelwein typically reaches 8, which falls under the very high exposure category.

Data source: Oelwein 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 Oelwein Compares to Other Months

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

This table compares monthly weather conditions in Oelwein, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-7°C (20°F)	40 mm (1.6 inches)	84%	moderate
February Weather	-6°C (21°F)	52 mm (2.0 inches)	85%	moderate
March Weather	2°C (36°F)	68 mm (2.7 inches)	84%	moderate
April Weather	8°C (46°F)	75 mm (3.0 inches)	83%	very high
May Weather	16°C (60°F)	176 mm (6.9 inches)	75%	very high
June Weather	22°C (72°F)	138 mm (5.4 inches)	79%	extreme
July Weather	23°C (75°F)	106 mm (4.2 inches)	75%	very high
August Weather	21°C (71°F)	102 mm (4.0 inches)	69%	very high
September Weather	18°C (66°F)	129 mm (5.1 inches)	74%	very high
October Weather	10°C (51°F)	137 mm (5.4 inches)	79%	moderate
November Weather	2°C (36°F)	49 mm (1.9 inches)	88%	moderate
December Weather	-2°C (29°F)	36 mm (1.4 inches)	82%	moderate