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May Weather in Heppner, United States

Last updated: June 24, 2025

In Heppner, United States, the average temperature in May hovers around 12°C (55°F), with fluctuations that can dip as low as -2°C (28°F) or soar to a high of 30°C (87°F). Expect about 47 mm (1.8 in) of precipitation spread over 10 days, contributing to a relatively high average humidity of 77%.

May Temperature in Heppner

In May in Heppner, the average temperature is 12°C (55°F). The maximum can reach 30°C (87°F), while the minimum can dip to as low as -2°C (28°F). It's a diverse climate, so be sure to pack for both warm days and chilly nights while exploring.

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

The chart illustrates May temperature patterns in Heppner, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Heppner, May typically has an average temperature of 12°C (55°F), with highs reaching up to 30°C (87°F) and lows dropping to around -2°C (28°F).
JanFebMarAprMayJunJulAugSepOctNovDec333339465463717161483933
Data source: Temperature data for Heppner 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 Heppner

In Heppner in May, the total precipitation amount is 47 mm (1.8 in) spread over a period of 10 days.

May Precipitation Trends in Heppner

The chart displays monthly precipitation patterns in Heppner, 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 Heppner, May typically receives around 47 mm (1.8 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec60856969472721027466561
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Heppner

In Heppner in May humidity is 77%. With an average temperature of 12°C (55°F), this humidity feels like an enveloping dampness that can make outdoor activities a bit uncomfortable, causing travelers to feel slightly sticky and less energized.

May Average Humidity in Heppner

This chart illustrates the average monthly humidity levels in Heppner, 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 Heppner is approximately 77%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%86%85%83%77%81%77%60%58%75%85%87%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Heppner

In Heppner 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 Heppner.

Maximum UV Index Levels in Heppner for May

The chart shows the monthly maximum UV Index (UVI) for Heppner 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 Heppner typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34689101098532
Data source: Heppner 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 Heppner Compares to Other Months

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

This table compares monthly weather conditions in Heppner, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (33°F)60 mm (2.3 inches)86%moderate
February Weather0°C (33°F)85 mm (3.3 inches)86%moderate
March Weather4°C (39°F)69 mm (2.7 inches)85%high
April Weather8°C (46°F)69 mm (2.7 inches)83%very high
May Weather12°C (55°F)47 mm (1.8 inches)77%very high
June Weather17°C (63°F)27 mm (1.1 inches)81%very high
July Weather22°C (72°F)2 mm (0.1 inches)76%very high
August Weather22°C (71°F)10 mm (0.4 inches)60%very high
September Weather16°C (61°F)27 mm (1.1 inches)58%very high
October Weather9°C (48°F)46 mm (1.8 inches)75%moderate
November Weather4°C (39°F)65 mm (2.5 inches)85%moderate
December Weather0°C (33°F)61 mm (2.4 inches)87%low

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