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May Weather in Bellevue, United States

Last updated: June 24, 2025

The average temperature in Bellevue, United States during May hovers around 17°C (63°F), offering a mild climate. Temperatures can dip as low as 2°C (36°F) and soar up to 37°C (98°F), showcasing significant variability. Additionally, expect about 152 mm (6.0 in) of precipitation over 16 days, accompanied by an average humidity of 78%, creating a uniquely refreshing atmosphere.

May Temperature in Bellevue

In May in Bellevue, the average temperature is 17°C (63°F). The maximum can reach 37°C (98°F), while the minimum can drop to as low as 2°C (36°F). Be sure to pack accordingly to enjoy both warm days and chilly nights 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 17°C (63°F), with highs reaching up to 37°C (98°F) and lows dropping to around 2°C (36°F).
JanFebMarAprMayJunJulAugSepOctNovDec252541506376787569534031
Data source: Temperature data for Bellevue 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 Bellevue

In Bellevue in May, the precipitation amount is 152 mm (6.0 in) distributed over 16 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 152 mm (6.0 inches) of precipitation spread over approximately 16 days.
JanFebMarAprMayJunJulAugSepOctNovDec3332975715213375103841263138
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Bellevue

In Bellevue 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 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 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%80%73%75%78%82%83%81%75%75%82%83%
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 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 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 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356810101098642
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.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (25°F)33 mm (1.3 inches)76%moderate
February Weather-4°C (26°F)32 mm (1.3 inches)80%moderate
March Weather5°C (41°F)97 mm (3.8 inches)73%high
April Weather10°C (50°F)57 mm (2.2 inches)74%very high
May Weather17°C (63°F)152 mm (6.0 inches)78%very high
June Weather24°C (76°F)133 mm (5.2 inches)82%very high
July Weather25°C (78°F)75 mm (2.9 inches)83%very high
August Weather24°C (75°F)103 mm (4.1 inches)80%very high
September Weather21°C (70°F)84 mm (3.3 inches)75%very high
October Weather11°C (53°F)126 mm (4.9 inches)75%high
November Weather4°C (40°F)31 mm (1.2 inches)82%moderate
December Weather0°C (31°F)38 mm (1.5 inches)83%low

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