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May Weather in Oregon, United States

Last updated: June 24, 2025

In May, the average temperature in Oregon, United States hovers around 15°C (60°F), with a minimum dipping to -1°C (30°F) and reaching a maximum of 34°C (94°F). Expect about 133 mm (5.2 in) of precipitation spread across 14 days, resulting in an average humidity level of 78%. Stay prepared for a mix of weather during your visit!

May Temperature in Oregon

In May in Oregon, the average temperature is 15°C (60°F). Maximum temperatures can reach 34°C (94°F), while minimums can drop as low as -1°C (30°F). Be prepared for a wide range of temperatures when planning your trip!

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

The chart illustrates May temperature patterns in Oregon, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Oregon, May typically has an average temperature of 15°C (60°F), with highs reaching up to 34°C (94°F) and lows dropping to around -1°C (30°F).
JanFebMarAprMayJunJulAugSepOctNovDec212336465971757165513629
Data source: Temperature data for Oregon 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 Oregon

In Oregon in May, the precipitation amount is 133 mm (5.2 in) occurring over the course of 14 days.

May Precipitation Trends in Oregon

The chart displays monthly precipitation patterns in Oregon, 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 Oregon, May typically receives around 133 mm (5.2 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec52555895133121841111201174346
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Oregon

In Oregon in May, humidity is 78%. With an average temperature of 15°C (60°F), this humidity feels like a warm, damp embrace that can make outdoor activities a bit uncomfortable, highlighting the importance of staying hydrated and taking breaks in the shade while exploring.

May Average Humidity in Oregon

This chart illustrates the average monthly humidity levels in Oregon, 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 Oregon is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%85%85%85%78%80%78%76%79%83%88%82%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Oregon

In Oregon in May, 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 Oregon.

Maximum UV Index Levels in Oregon for May

The chart shows the monthly maximum UV Index (UVI) for Oregon 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 Oregon typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34589101098532
Data source: Oregon 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 Oregon Compares to Other Months

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

This table compares monthly weather conditions in Oregon, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (21°F)52 mm (2.1 inches)85%moderate
February Weather-5°C (23°F)54 mm (2.1 inches)85%moderate
March Weather2°C (36°F)58 mm (2.3 inches)85%moderate
April Weather8°C (46°F)95 mm (3.7 inches)85%very high
May Weather15°C (60°F)133 mm (5.2 inches)78%very high
June Weather21°C (71°F)121 mm (4.8 inches)80%very high
July Weather24°C (75°F)84 mm (3.3 inches)78%very high
August Weather22°C (71°F)111 mm (4.4 inches)76%very high
September Weather18°C (65°F)120 mm (4.7 inches)79%very high
October Weather11°C (51°F)117 mm (4.6 inches)83%moderate
November Weather2°C (37°F)43 mm (1.7 inches)88%moderate
December Weather-2°C (29°F)46 mm (1.8 inches)81%low

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