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May Weather in Tri-City, United States

Last updated: June 24, 2025

In May, the average temperature in Tri-City, United States hovers around 13°C (55°F). Expect a minimum of 1°C (35°F) and a pleasant maximum of 30°C (87°F). This month brings about 61 mm (2.4 in) of precipitation spread over 8 days, contributing to an average humidity of 83%. Get ready for a mix of conditions!

May Temperature in Tri-City

In May in Tri-City, the average temperature is 13°C (55°F). The maximum can reach 30°C (87°F), while the minimum can drop as low as 1°C (35°F). Overall, it's advisable to pack layers for your trip to Tri-City during this time to accommodate the varying temperatures.

May Weather in Tri-City: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Tri-City, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Tri-City, May typically has an average temperature of 13°C (55°F), with highs reaching up to 30°C (87°F) and lows dropping to around 1°C (35°F).
JanFebMarAprMayJunJulAugSepOctNovDec404044495562686862524539
Data source: Temperature data for Tri-City 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 Tri-City

In Tri-City in May, the precipitation amount is 61 mm (2.4 in) distributed over 8 days.

May Precipitation Trends in Tri-City

The chart displays monthly precipitation patterns in Tri-City, 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 Tri-City, May typically receives around 61 mm (2.4 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec1401751241126131286167107140
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Tri-City

In Tri-City in May humidity is 83%. With an average temperature of 13°C (55°F), this humidity feels like a damp embrace, often leaving travelers feeling slightly sticky and in need of frequent breaks in the shade.

May Average Humidity in Tri-City

This chart illustrates the average monthly humidity levels in Tri-City, 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 Tri-City is approximately 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%85%86%83%83%83%78%67%66%77%87%87%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Tri-City

In Tri-City 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 Tri-City.

Maximum UV Index Levels in Tri-City for May

The chart shows the monthly maximum UV Index (UVI) for Tri-City 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 Tri-City typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec346810101098632
Data source: Tri-City 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 Tri-City Compares to Other Months

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

This table compares monthly weather conditions in Tri-City, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (40°F)140 mm (5.5 inches)84%moderate
February Weather4°C (40°F)175 mm (6.9 inches)85%moderate
March Weather7°C (44°F)124 mm (4.9 inches)86%high
April Weather10°C (49°F)112 mm (4.4 inches)83%very high
May Weather13°C (55°F)61 mm (2.4 inches)83%very high
June Weather17°C (62°F)31 mm (1.2 inches)83%very high
July Weather20°C (68°F)2 mm (0.1 inches)78%very high
August Weather20°C (68°F)8 mm (0.3 inches)67%very high
September Weather17°C (62°F)61 mm (2.4 inches)66%very high
October Weather11°C (52°F)67 mm (2.6 inches)77%high
November Weather7°C (45°F)107 mm (4.2 inches)87%moderate
December Weather4°C (39°F)140 mm (5.5 inches)87%low

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