May Weather in Richland, United States

Last updated: June 24, 2025

In Richland, United States, the average temperature in May is a mild 17°C (63°F). However, temperatures can vary widely, ranging from a chilly 1°C (34°F) to a scorching 36°C (97°F). Be prepared for 151 mm (5.9 in) of precipitation spread over 15 days, and expect a comfortable average humidity level of 78%.

May Temperature in Richland

In May in Richland, the average temperature is 17°C (63°F), with maximums reaching 36°C (97°F) and minimums dropping as low as 1°C (34°F). This variability in temperature makes it essential to pack accordingly for a comfortable travel experience.

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 17°C (63°F), with highs reaching up to 36°C (97°F) and lows dropping to around 1°C (34°F).

Data source: Temperature data for Richland generated using information from the Copernicus Climate Change Service.

May Precipitation in Richland

In Richland in May, the precipitation amount is 151 mm (5.9 in) 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 151 mm (5.9 inches) of precipitation spread over approximately 15 days.

Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

May Humidity in Richland

In Richland in May, humidity is 78%. With an average temperature of 17°C (63°F), this humidity feels like a warm, enveloping blanket, making traveling slightly uncomfortable as you navigate the sticky air, prompting the need for frequent breaks in cooler, shaded areas.

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 78%, offering insight into how humid the weather typically is during this month.

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.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	-5°C (24°F)	50 mm (2.0 inches)	81%	moderate
February Weather	-4°C (26°F)	56 mm (2.2 inches)	81%	moderate
March Weather	5°C (41°F)	87 mm (3.4 inches)	81%	high
April Weather	10°C (50°F)	81 mm (3.2 inches)	82%	very high
May Weather	17°C (63°F)	151 mm (5.9 inches)	78%	very high
June Weather	24°C (75°F)	137 mm (5.4 inches)	81%	extreme
July Weather	25°C (77°F)	70 mm (2.8 inches)	79%	very high
August Weather	23°C (74°F)	70 mm (2.8 inches)	77%	very high
September Weather	20°C (69°F)	121 mm (4.8 inches)	78%	very high
October Weather	12°C (54°F)	126 mm (5.0 inches)	78%	high
November Weather	4°C (39°F)	52 mm (2.1 inches)	87%	moderate
December Weather	0°C (32°F)	45 mm (1.8 inches)	84%	moderate