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September Weather in Olney, United States

Last updated: June 24, 2025

In September, the average temperature in Olney, United States is a warm 26°C (79°F), but be prepared for an impressive range! Temperatures can dip to a brisk 8°C (47°F) and soar up to a sizzling 40°C (103°F). Expect precipitation of around 94 mm (3.7 in) over 6 days, accompanied by an average humidity of 64%.

September Temperature in Olney

In September in Olney, the average temperature is a warm 26°C (79°F). Maximum temperatures can reach a scorching 40°C (103°F), while minimums can drop to a cool 8°C (47°F). Be prepared for a mix of warm days and cooler nights when traveling to Olney during this month.

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 26°C (79°F), with highs reaching up to 40°C (103°F) and lows dropping to around 8°C (47°F).
JanFebMarAprMayJunJulAugSepOctNovDec454759657583878679665550
Data source: Temperature data for Olney generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Olney

In Olney in September, the precipitation amount is 94 mm (3.7 in) 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 94 mm (3.7 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec374471639957234894783341
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Olney

In Olney in September, humidity is 64%. With an average temperature of 26°C (79°F), this humidity feels like a warm embrace, making travel slightly uncomfortable as the air clings to your skin and the heat amplifies.

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 64%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec77%76%74%75%80%80%75%67%64%70%82%85%
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 reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more 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 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec468101111111110864
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.
 TemperaturePrecipitationHumidityUV
January Weather7°C (45°F)37 mm (1.5 inches)77%moderate
February Weather8°C (47°F)44 mm (1.7 inches)76%high
March Weather15°C (59°F)71 mm (2.8 inches)74%very high
April Weather18°C (65°F)63 mm (2.5 inches)75%very high
May Weather24°C (75°F)99 mm (3.9 inches)80%extreme
June Weather28°C (83°F)57 mm (2.2 inches)80%extreme
July Weather30°C (87°F)23 mm (0.9 inches)75%extreme
August Weather30°C (86°F)48 mm (1.9 inches)67%extreme
September Weather26°C (79°F)94 mm (3.7 inches)64%very high
October Weather19°C (67°F)78 mm (3.1 inches)70%very high
November Weather13°C (55°F)33 mm (1.3 inches)82%high
December Weather10°C (50°F)41 mm (1.6 inches)85%moderate

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