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September Weather in Olean, United States

Last updated: June 24, 2025

In Olean, United States, the average temperature in September hovers around 17°C (62°F), providing a pleasant climate. Expect minimums dropping to 0°C (33°F) and highs reaching up to 31°C (88°F). With an average humidity of 67%, the air can feel quite comfortable. Be prepared for some rain, as 93 mm (3.7 in) of precipitation typically falls over 10 days this month.

September Temperature in Olean

In September in Olean, the average temperature is 17°C (62°F). Maximums can reach 31°C (88°F) and minimums can be as low as 0°C (33°F). It's a great time to explore Olean, so be prepared for both warm days and cooler evenings!

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

The chart illustrates September temperature patterns in Olean, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Olean, September typically has an average temperature of 17°C (62°F), with highs reaching up to 31°C (88°F) and lows dropping to around 0°C (33°F).
JanFebMarAprMayJunJulAugSepOctNovDec252734455765706862523730
Data source: Temperature data for Olean 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 Olean

In Olean in September, the precipitation amount is 93 mm (3.7 in) over the course of 10 days.

September Precipitation Trends in Olean

The chart displays monthly precipitation patterns in Olean, 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 Olean, September typically receives around 93 mm (3.7 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec861019111713011711790931239492
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Olean

In Olean in September, humidity is 67%. With an average temperature of 17°C (62°F), this humidity feels like a warm embrace, making travel enjoyable as long as you stay hydrated and take breaks in shaded areas.

September Average Humidity in Olean

This chart illustrates the average monthly humidity levels in Olean, 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 Olean is approximately 67%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%90%89%88%80%79%74%64%67%81%89%88%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Olean

In Olean 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 Olean.

Maximum UV Index Levels in Olean for September

The chart shows the monthly maximum UV Index (UVI) for Olean 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 Olean typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098642
Data source: Olean 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 Olean Compares to Other Months

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

This table compares monthly weather conditions in Olean, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (25°F)86 mm (3.4 inches)89%moderate
February Weather-3°C (28°F)101 mm (4.0 inches)90%moderate
March Weather1°C (34°F)91 mm (3.6 inches)89%high
April Weather7°C (45°F)117 mm (4.6 inches)88%very high
May Weather14°C (57°F)130 mm (5.1 inches)80%very high
June Weather18°C (65°F)117 mm (4.6 inches)79%very high
July Weather21°C (70°F)116 mm (4.6 inches)74%very high
August Weather20°C (68°F)90 mm (3.6 inches)64%very high
September Weather17°C (62°F)93 mm (3.7 inches)67%very high
October Weather11°C (52°F)123 mm (4.8 inches)81%high
November Weather3°C (37°F)94 mm (3.7 inches)89%moderate
December Weather-1°C (31°F)92 mm (3.6 inches)88%low

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