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May Weather in Richland, United States

Last updated: June 24, 2025

In May, the average temperature in Richland, United States is a comfortable 14°C (57°F). However, temperatures can vary widely, with a minimum of -1°C (30°F) and a maximum reaching up to 30°C (87°F). Expect 134 mm (5.3 in) of precipitation over approximately 15 days, contributing to an average humidity of 82%.

May Temperature in Richland

In May in Richland, the average temperature is 14°C (57°F). Maximum can reach 30°C (87°F) and minimum can be as low as -1°C (30°F). Travelers should be prepared for a wide range of temperatures and pack accordingly.

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

The chart illustrates May temperature patterns in Richland, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Richland, May typically has an average temperature of 14°C (57°F), with highs reaching up to 30°C (87°F) and lows dropping to around -1°C (30°F).
JanFebMarAprMayJunJulAugSepOctNovDec232632445766717063523829
Data source: Temperature data for Richland 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 Richland

In Richland in May, the total precipitation amount is 134 mm (5.3 in) spread over a period of 15 days.

May Precipitation Trends in Richland

The chart displays monthly precipitation patterns in Richland, 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 Richland, May typically receives around 134 mm (5.3 inches) of precipitation spread over approximately 15 days.
JanFebMarAprMayJunJulAugSepOctNovDec11612010614113411218412398190139142
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Richland

In Richland in May, humidity is 82%. With an average temperature of 14°C (57°F), this humidity feels like a thick blanket enveloping you, making outdoor activities uncomfortable and travel more challenging due to the heavy, damp air.

May Average Humidity in Richland

This chart illustrates the average monthly humidity levels in Richland, 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 Richland is approximately 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%90%87%88%82%79%78%76%78%84%89%86%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Richland

In Richland 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 Richland.

Maximum UV Index Levels in Richland for May

The chart shows the monthly maximum UV Index (UVI) for Richland 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 Richland typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3468910997532
Data source: Richland 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 Richland Compares to Other Months

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

This table compares monthly weather conditions in Richland, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-5°C (24°F)116 mm (4.6 inches)90%moderate
February Weather-3°C (26°F)119 mm (4.7 inches)90%moderate
March Weather0°C (33°F)106 mm (4.2 inches)87%high
April Weather7°C (45°F)141 mm (5.6 inches)88%very high
May Weather14°C (57°F)134 mm (5.3 inches)82%very high
June Weather19°C (66°F)112 mm (4.4 inches)79%very high
July Weather22°C (72°F)184 mm (7.2 inches)78%very high
August Weather21°C (70°F)123 mm (4.8 inches)76%very high
September Weather17°C (63°F)98 mm (3.9 inches)78%high
October Weather11°C (53°F)190 mm (7.5 inches)84%moderate
November Weather3°C (38°F)139 mm (5.5 inches)89%moderate
December Weather-1°C (30°F)142 mm (5.6 inches)86%low

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