May Weather in Joint Base Lewis McChord, United States

Last updated: June 24, 2025

In May, the average temperature in Joint Base Lewis McChord, United States is a comfortable 13°C (55°F), with minimums dipping to 3°C (38°F) and maximums soaring to 28°C (83°F). Expect a total precipitation of 68 mm (2.7 in) spread across 12 days, contributing to an average humidity of 84%. Perfect for those who enjoy a mild, slightly damp climate!

May Temperature in Joint Base Lewis McChord

In May in Joint Base Lewis McChord, the average temperature is 13°C (55°F), with maximums reaching up to 28°C (83°F) and minimums dropping as low as 3°C (38°F). This mild climate makes Joint Base Lewis McChord an ideal destination for travelers looking to enjoy a pleasant outdoor experience during this time of year.

May Weather in Joint Base Lewis McChord: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Joint Base Lewis McChord, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Joint Base Lewis McChord, May typically has an average temperature of 13°C (55°F), with highs reaching up to 28°C (83°F) and lows dropping to around 3°C (38°F).

Data source: Temperature data for Joint Base Lewis McChord generated using information from the Copernicus Climate Change Service.

May Precipitation in Joint Base Lewis McChord

In Joint Base Lewis McChord in May, the precipitation amount is 68 mm (2.7 in) over the course of 12 days.

May Precipitation Trends in Joint Base Lewis McChord

The chart displays monthly precipitation patterns in Joint Base Lewis McChord, 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 Joint Base Lewis McChord, May typically receives around 68 mm (2.7 inches) of precipitation spread over approximately 12 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 Joint Base Lewis McChord

In Joint Base Lewis McChord in May humidity is 84%. With average temperature 13°C (55°F), this humidity feels like a heavy blanket wrapping around you, making every step feel sluggish and draining for traveling.

May Average Humidity in Joint Base Lewis McChord

This chart illustrates the average monthly humidity levels in Joint Base Lewis McChord, 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 Joint Base Lewis McChord 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 Joint Base Lewis McChord

In Joint Base Lewis McChord in May, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Joint Base Lewis McChord.

Maximum UV Index Levels in Joint Base Lewis McChord for May

The chart shows the monthly maximum UV Index (UVI) for Joint Base Lewis McChord 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 Joint Base Lewis McChord typically reaches 8, which falls under the very high exposure category.

Data source: Joint Base Lewis McChord 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 Joint Base Lewis McChord Compares to Other Months

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

This table compares monthly weather conditions in Joint Base Lewis McChord, 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)	183 mm (7.2 inches)	86%	low
February Weather	4°C (40°F)	189 mm (7.4 inches)	84%	moderate
March Weather	7°C (44°F)	136 mm (5.4 inches)	85%	moderate
April Weather	9°C (49°F)	118 mm (4.7 inches)	83%	high
May Weather	13°C (55°F)	68 mm (2.7 inches)	84%	very high
June Weather	16°C (60°F)	58 mm (2.3 inches)	84%	very high
July Weather	18°C (65°F)	11 mm (0.4 inches)	82%	very high
August Weather	18°C (66°F)	13 mm (0.5 inches)	73%	very high
September Weather	16°C (60°F)	90 mm (3.5 inches)	74%	high
October Weather	10°C (51°F)	142 mm (5.6 inches)	83%	moderate
November Weather	7°C (45°F)	180 mm (7.1 inches)	86%	moderate
December Weather	5°C (41°F)	201 mm (7.9 inches)	87%	low