May Weather in Bellevue, United States

Last updated: June 24, 2025

In Bellevue, United States, the average temperature in May hovers around 8°C (47°F). Temperatures can vary significantly, with a minimum of -7°C (19°F) and reaching a maximum of 28°C (83°F). Expect about 52 mm (2.0 in) of precipitation spread over 10 days, and enjoy an average humidity of 66% as you experience the unique climate of this region.

May Temperature in Bellevue

In May in Bellevue, the average temperature is 8°C (47°F). Maximums can reach 28°C (83°F), and minimums can drop as low as -7°C (19°F). This wide range of temperatures means you should pack for both warm and cold weather during your travels.

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

The chart illustrates May temperature patterns in Bellevue, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Bellevue, May typically has an average temperature of 8°C (47°F), with highs reaching up to 28°C (83°F) and lows dropping to around -7°C (19°F).

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

May Precipitation in Bellevue

In Bellevue in May, the precipitation amount is 52 mm (2.0 in) over the course of 10 days.

May Precipitation Trends in Bellevue

The chart displays monthly precipitation patterns in Bellevue, 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 Bellevue, May typically receives around 52 mm (2.0 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 Bellevue

In Bellevue in May, humidity is 66%. With an average temperature of 8°C (47°F), this humidity feels like a crisp chill that clings to your skin, making outdoor activities invigorating but requiring an extra layer to stay comfortable while exploring the sights.

May Average Humidity in Bellevue

This chart illustrates the average monthly humidity levels in Bellevue, 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 Bellevue is approximately 66%, 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 Bellevue

In Bellevue in May, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Bellevue.

Maximum UV Index Levels in Bellevue for May

The chart shows the monthly maximum UV Index (UVI) for Bellevue 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 Bellevue typically reaches 11, which falls under the extreme exposure category.

Data source: Bellevue 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 Bellevue Compares to Other Months

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

This table compares monthly weather conditions in Bellevue, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-7°C (20°F)	58 mm (2.3 inches)	91%	moderate
February Weather	-6°C (22°F)	80 mm (3.1 inches)	92%	moderate
March Weather	-1°C (30°F)	49 mm (1.9 inches)	85%	very high
April Weather	3°C (38°F)	43 mm (1.7 inches)	76%	very high
May Weather	8°C (47°F)	52 mm (2.0 inches)	66%	extreme
June Weather	15°C (58°F)	25 mm (1.0 inches)	62%	extreme
July Weather	20°C (68°F)	5 mm (0.2 inches)	53%	extreme
August Weather	19°C (66°F)	17 mm (0.7 inches)	42%	very high
September Weather	13°C (56°F)	21 mm (0.8 inches)	46%	very high
October Weather	5°C (41°F)	34 mm (1.3 inches)	64%	high
November Weather	-1°C (30°F)	43 mm (1.7 inches)	83%	moderate
December Weather	-7°C (20°F)	45 mm (1.8 inches)	87%	moderate