May Weather in Chehalis, United States

Last updated: June 24, 2025

In May, the average temperature in Chehalis, United States is a pleasant 13°C (56°F). Expect a minimum of 2°C (36°F) and a comfortable maximum of 30°C (86°F). This month sees about 71 mm (2.8 in) of precipitation spread over 10 days, while the average humidity hovers around a noteworthy 84%.

May Temperature in Chehalis

In May in Chehalis, the average temperature is 13°C (56°F). The maximum can reach 30°C (86°F) and the minimum can be as low as 2°C (36°F). This variation in temperature makes it essential for travelers to pack layers to accommodate both warm and cooler conditions.

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

The chart illustrates May temperature patterns in Chehalis, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Chehalis, May typically has an average temperature of 13°C (56°F), with highs reaching up to 30°C (86°F) and lows dropping to around 2°C (36°F).

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

May Precipitation in Chehalis

In Chehalis in May, the precipitation amount is 71 mm (2.8 in) over a duration of 10 days.

May Precipitation Trends in Chehalis

The chart displays monthly precipitation patterns in Chehalis, 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 Chehalis, May typically receives around 71 mm (2.8 inches) of precipitation spread over approximately 10 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

May Humidity in Chehalis

In Chehalis in May, humidity is 84%. With an average temperature of 13°C (56°F), this humidity feels like a damp blanket wrapping around you, making it feel cooler and more uncomfortable for traveling, as the air clings to your skin and weighs you down with a sense of heaviness.

May Average Humidity in Chehalis

This chart illustrates the average monthly humidity levels in Chehalis, 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 Chehalis is approximately 84%, 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 Chehalis

In Chehalis 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 Chehalis.

Maximum UV Index Levels in Chehalis for May

The chart shows the monthly maximum UV Index (UVI) for Chehalis 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 Chehalis typically reaches 9, which falls under the very high exposure category.

Data source: Chehalis 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 Chehalis Compares to Other Months

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

This table compares monthly weather conditions in Chehalis, 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 (41°F)	186 mm (7.3 inches)	86%	low
February Weather	4°C (40°F)	169 mm (6.7 inches)	84%	moderate
March Weather	7°C (45°F)	137 mm (5.4 inches)	85%	moderate
April Weather	10°C (49°F)	119 mm (4.7 inches)	83%	high
May Weather	13°C (56°F)	71 mm (2.8 inches)	84%	very high
June Weather	16°C (60°F)	54 mm (2.1 inches)	84%	very high
July Weather	18°C (65°F)	12 mm (0.5 inches)	82%	very high
August Weather	19°C (66°F)	15 mm (0.6 inches)	73%	very high
September Weather	16°C (61°F)	88 mm (3.5 inches)	74%	high
October Weather	10°C (51°F)	132 mm (5.2 inches)	83%	moderate
November Weather	7°C (45°F)	181 mm (7.1 inches)	86%	moderate
December Weather	5°C (40°F)	198 mm (7.8 inches)	87%	low