September Weather in Olney, United States

Last updated: June 24, 2025

In September, the average temperature in Olney, United States is a pleasant 23°C (73°F). Temperatures can vary widely, with minimums plunging to 8°C (47°F) and soaring to a maximum of 34°C (94°F). Visitors should expect 68 mm (2.7 in) of precipitation spread over approximately 6 days, alongside an average humidity level of 79%.

September Temperature in Olney

In September in Olney, the average temperature is 23°C (73°F), with maximums reaching 34°C (94°F) and minimums dropping to as low as 8°C (47°F). This pleasant climate makes it an ideal time for travelers to explore and enjoy outdoor activities.

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

The chart illustrates September temperature patterns in Olney, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Olney, September typically has an average temperature of 23°C (73°F), with highs reaching up to 34°C (94°F) and lows dropping to around 8°C (47°F).

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

September Precipitation in Olney

In Olney in September, the precipitation amount is 68 mm (2.7 in) spread over the course of 6 days.

September Precipitation Trends in Olney

The chart displays monthly precipitation patterns in Olney, 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 Olney, September typically receives around 68 mm (2.7 inches) of precipitation spread over approximately 6 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 Olney

In Olney in September humidity is 79%. With an average temperature of 23°C (73°F), this humidity feels like a warm embrace that clings to the skin, making travel feel both invigorating and slightly exhausting as the air wraps around you like a damp blanket.

September Average Humidity in Olney

This chart illustrates the average monthly humidity levels in Olney, 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 Olney is approximately 79%, 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 Olney

In Olney 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 Olney.

Maximum UV Index Levels in Olney for September

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

Data source: Olney 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 Olney Compares to Other Months

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

This table compares monthly weather conditions in Olney, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	1°C (33°F)	91 mm (3.6 inches)	84%	moderate
February Weather	2°C (37°F)	105 mm (4.1 inches)	82%	moderate
March Weather	8°C (47°F)	131 mm (5.2 inches)	84%	high
April Weather	13°C (56°F)	119 mm (4.7 inches)	83%	very high
May Weather	20°C (68°F)	137 mm (5.4 inches)	80%	very high
June Weather	25°C (77°F)	114 mm (4.5 inches)	83%	extreme
July Weather	26°C (80°F)	101 mm (4.0 inches)	82%	very high
August Weather	25°C (77°F)	93 mm (3.7 inches)	82%	very high
September Weather	23°C (73°F)	68 mm (2.7 inches)	79%	very high
October Weather	16°C (60°F)	103 mm (4.1 inches)	79%	high
November Weather	7°C (44°F)	102 mm (4.0 inches)	88%	moderate
December Weather	4°C (39°F)	92 mm (3.6 inches)	87%	moderate