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May Weather in Grand Ronde, United States

Last updated: June 24, 2025

In May, the average temperature in Grand Ronde, United States is a pleasant 13°C (55°F), making it ideal for outdoor activities. Expect a range between a chilly 1°C (35°F) and a warm 31°C (87°F). However, be prepared for some rain, as the region typically sees around 63 mm (2.5 in) of precipitation over 9 days. With an average humidity of 83%, the atmosphere is comfortably refreshing!

May Temperature in Grand Ronde

In May in Grand Ronde, the average temperature is 13°C (55°F). Maximums can reach 31°C (87°F), while minimums can drop to as low as 1°C (35°F). This dynamic weather makes Grand Ronde an exciting destination for travelers prepared for both warm and chilly conditions.

May Weather in Grand Ronde: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Grand Ronde, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Grand Ronde, May typically has an average temperature of 13°C (55°F), with highs reaching up to 31°C (87°F) and lows dropping to around 1°C (35°F).
JanFebMarAprMayJunJulAugSepOctNovDec414044495560656661524541
Data source: Temperature data for Grand Ronde 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 Grand Ronde

In Grand Ronde in May, the total precipitation amount is 63 mm (2.5 in) spread over a duration of 9 days.

May Precipitation Trends in Grand Ronde

The chart displays monthly precipitation patterns in Grand Ronde, 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 Grand Ronde, May typically receives around 63 mm (2.5 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec19418015012663495668105178210
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Grand Ronde

In Grand Ronde in May humidity is 83%. With an average temperature of 13°C (55°F), this humidity feels like a damp embrace, often leaving travelers feeling slightly sticky and in need of frequent breaks in the shade.

May Average Humidity in Grand Ronde

This chart illustrates the average monthly humidity levels in Grand Ronde, 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 Grand Ronde is approximately 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%84%85%83%83%84%82%74%71%81%87%87%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Grand Ronde

In Grand Ronde 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 Grand Ronde.

Maximum UV Index Levels in Grand Ronde for May

The chart shows the monthly maximum UV Index (UVI) for Grand Ronde 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 Grand Ronde typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec23579101097532
Data source: Grand Ronde 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 Grand Ronde Compares to Other Months

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

This table compares monthly weather conditions in Grand Ronde, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (41°F)194 mm (7.6 inches)85%low
February Weather5°C (41°F)180 mm (7.1 inches)84%moderate
March Weather7°C (45°F)150 mm (5.9 inches)85%moderate
April Weather9°C (49°F)126 mm (4.9 inches)83%high
May Weather13°C (55°F)63 mm (2.5 inches)83%very high
June Weather16°C (61°F)49 mm (1.9 inches)83%very high
July Weather18°C (65°F)5 mm (0.2 inches)82%very high
August Weather19°C (66°F)6 mm (0.2 inches)74%very high
September Weather16°C (61°F)68 mm (2.7 inches)71%high
October Weather11°C (52°F)105 mm (4.1 inches)81%moderate
November Weather7°C (46°F)178 mm (7.0 inches)87%moderate
December Weather5°C (41°F)210 mm (8.3 inches)87%low

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