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May Weather in Richland, United States

Last updated: June 24, 2025

In Richland, United States, the average temperature in May hovers around 19°C (66°F), with a minimum of 3°C (38°F) and a maximum of 34°C (93°F). Expect approximately 165 mm (6.5 in) of precipitation over about 14 days, coupled with an average humidity of 83%. This blend of warmth and moisture creates a unique climate that is both vibrant and lush.

May Temperature in Richland

In May in Richland, the average temperature is 19°C (66°F). Maximums can reach 34°C (93°F), while minimums can dip to as low as 3°C (38°F). This variability makes Richland a great destination for travelers who enjoy diverse weather experiences.

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 19°C (66°F), with highs reaching up to 34°C (93°F) and lows dropping to around 3°C (38°F).
JanFebMarAprMayJunJulAugSepOctNovDec343748556675797672594641
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 precipitation amount is 165 mm (6.5 in) spread over 14 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 165 mm (6.5 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec7981130148165959891511346452
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 83%. With an average temperature of 19°C (66°F), this humidity feels like a heavy blanket wrapping around you, making travel feel more sluggish and muggy, yet there's a refreshing coolness in the air that invites you to explore.

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 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec81%78%76%78%83%83%78%68%64%70%83%87%
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 reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more 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 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec36710101111109753
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 Weather1°C (34°F)79 mm (3.1 inches)81%moderate
February Weather3°C (37°F)80 mm (3.2 inches)78%high
March Weather9°C (49°F)130 mm (5.1 inches)76%high
April Weather13°C (55°F)148 mm (5.8 inches)78%very high
May Weather19°C (66°F)165 mm (6.5 inches)83%very high
June Weather24°C (76°F)95 mm (3.7 inches)83%extreme
July Weather26°C (79°F)98 mm (3.9 inches)78%extreme
August Weather25°C (76°F)91 mm (3.6 inches)68%very high
September Weather22°C (73°F)51 mm (2.0 inches)64%very high
October Weather15°C (59°F)134 mm (5.3 inches)70%high
November Weather8°C (46°F)64 mm (2.5 inches)83%moderate
December Weather5°C (41°F)52 mm (2.1 inches)87%moderate

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