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May Weather in Olean, United States

Last updated: June 24, 2025

In May, the average temperature in Olean, United States hovers around 14°C (57°F), making it a mild destination. However, be prepared for a temperature range that can swing from a chilly -4°C (25°F) to a warm 30°C (86°F). During this month, 130 mm (5.1 in) of precipitation is expected over the course of 15 days, contributing to an average humidity of 80%. Be sure to pack accordingly for changing conditions!

May Temperature in Olean

In May in Olean, the average temperature is 14°C (57°F), with maximums that can reach 30°C (86°F) and minimums that can drop as low as -4°C (25°F). This varied climate makes it essential for travelers to pack both light and warm clothing to ensure comfort during their stay.

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

The chart illustrates May 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, May typically has an average temperature of 14°C (57°F), with highs reaching up to 30°C (86°F) and lows dropping to around -4°C (25°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.

May Precipitation in Olean

In Olean in May, the total precipitation amount is 130 mm (5.1 in) over the course of 15 days.

May Precipitation Trends in Olean

The chart displays monthly precipitation patterns in Olean, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In Olean, May typically receives around 130 mm (5.1 inches) of precipitation spread over approximately 15 days.
JanFebMarAprMayJunJulAugSepOctNovDec861019111713011711790931239492
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Olean

In Olean in May, humidity is 80%. With an average temperature of 14°C (57°F), this humidity feels like a warm, damp blanket wrapping around you, making travel uncomfortable and sticky, as sweat clings to your skin and the air feels heavy with moisture.

May Average Humidity in Olean

This chart illustrates the average monthly humidity levels in Olean, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, average humidity in Olean is approximately 80%, 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 May generated using information from the Copernicus Climate Change Service.

May UV Index in Olean

In Olean in May, 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 Olean.

Maximum UV Index Levels in Olean for May

The chart shows the monthly maximum UV Index (UVI) for Olean in May, 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 May, the maximum UV index in Olean typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098642
Data source: Olean May 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 May 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 May’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 May’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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