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May Weather in Rainier, United States

Last updated: June 24, 2025

In Rainier, United States, the average temperature in May is 13°C (56°F), with a minimum of 2°C (36°F) and a maximum reaching 30°C (87°F). Prepare for some occasional rain, as the area receives about 71 mm (2.8 in) over 11 days. With an average humidity of 83%, expect a refreshing yet slightly damp atmosphere throughout the month!

May Temperature in Rainier

In May in Rainier, the average temperature is 13°C (56°F). Maximum temperatures can reach 30°C (87°F), while minimums can dip as low as 2°C (36°F). Be prepared for a range of temperatures, and pack accordingly for your travels!

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

The chart illustrates May temperature patterns in Rainier, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Rainier, May typically has an average temperature of 13°C (56°F), with highs reaching up to 30°C (87°F) and lows dropping to around 2°C (36°F).
JanFebMarAprMayJunJulAugSepOctNovDec414045505661656661514540
Data source: Temperature data for Rainier 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 Rainier

In Rainier in May, the precipitation amount is 71 mm (2.8 in) distributed over 11 days.

May Precipitation Trends in Rainier

The chart displays monthly precipitation patterns in Rainier, 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 Rainier, May typically receives around 71 mm (2.8 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec183166145119716091079117172192
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Rainier

In Rainier in May humidity is 83%. With an average temperature of 13°C (56°F), this humidity feels like a damp blanket wrapping around you, making travel a bit uncomfortable as the air feels heavy and the moisture clings to your skin.

May Average Humidity in Rainier

This chart illustrates the average monthly humidity levels in Rainier, 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 Rainier 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 Rainier

In Rainier 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 Rainier.

Maximum UV Index Levels in Rainier for May

The chart shows the monthly maximum UV Index (UVI) for Rainier 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 Rainier typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec23569101087532
Data source: Rainier 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 Rainier Compares to Other Months

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

This table compares monthly weather conditions in Rainier, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (41°F)183 mm (7.2 inches)85%low
February Weather4°C (40°F)166 mm (6.5 inches)84%moderate
March Weather7°C (45°F)145 mm (5.7 inches)85%moderate
April Weather10°C (50°F)119 mm (4.7 inches)83%high
May Weather13°C (56°F)71 mm (2.8 inches)83%very high
June Weather16°C (61°F)59 mm (2.3 inches)83%very high
July Weather18°C (65°F)9 mm (0.4 inches)82%very high
August Weather19°C (66°F)9 mm (0.4 inches)74%very high
September Weather16°C (62°F)79 mm (3.1 inches)71%high
October Weather11°C (51°F)117 mm (4.6 inches)81%moderate
November Weather7°C (45°F)172 mm (6.8 inches)87%moderate
December Weather5°C (40°F)192 mm (7.6 inches)87%low

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