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May Weather in Hillsboro, United States

Last updated: June 24, 2025

In May, the average temperature in Hillsboro, United States hovers around 18°C (65°F). However, temperatures can swing from a chilly 0°C (31°F) to a warm 34°C (94°F). Expect 14 rainy days contributing to a precipitation total of 149 mm (5.8 in), amidst an average humidity of 79%. Enjoy the variety this month brings!

May Temperature in Hillsboro

In May in Hillsboro, the average temperature is 18°C (65°F). Maximums can reach 34°C (94°F), and minimums can be as low as 0°C (31°F). This variation makes it essential for travelers to pack accordingly, preparing for both warm days and chilly nights.

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

The chart illustrates May temperature patterns in Hillsboro, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Hillsboro, May typically has an average temperature of 18°C (65°F), with highs reaching up to 34°C (94°F) and lows dropping to around 0°C (31°F).
JanFebMarAprMayJunJulAugSepOctNovDec293243526474777470584136
Data source: Temperature data for Hillsboro 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 Hillsboro

In Hillsboro in May, the precipitation amount is 149 mm (5.8 in) over a period of 14 days.

May Precipitation Trends in Hillsboro

The chart displays monthly precipitation patterns in Hillsboro, 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 Hillsboro, May typically receives around 149 mm (5.8 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec8081114104149103101108661198167
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Hillsboro

In Hillsboro in May, humidity is 79%. With an average temperature of 18°C (65°F), this humidity feels like walking through a warm mist, making traveling slightly uncomfortable and sticky, but offering a refreshing escape when you find moments of shade or a breeze.

May Average Humidity in Hillsboro

This chart illustrates the average monthly humidity levels in Hillsboro, 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 Hillsboro is approximately 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%85%86%84%79%82%79%70%69%76%88%87%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Hillsboro

In Hillsboro 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 Hillsboro.

Maximum UV Index Levels in Hillsboro for May

The chart shows the monthly maximum UV Index (UVI) for Hillsboro 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 Hillsboro typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910111098643
Data source: Hillsboro 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 Hillsboro Compares to Other Months

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

This table compares monthly weather conditions in Hillsboro, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (30°F)80 mm (3.2 inches)87%moderate
February Weather0°C (33°F)81 mm (3.2 inches)85%moderate
March Weather6°C (43°F)114 mm (4.5 inches)86%high
April Weather11°C (52°F)104 mm (4.1 inches)84%very high
May Weather18°C (65°F)149 mm (5.8 inches)79%very high
June Weather23°C (75°F)103 mm (4.1 inches)82%extreme
July Weather25°C (77°F)101 mm (4.0 inches)79%very high
August Weather24°C (75°F)108 mm (4.2 inches)70%very high
September Weather21°C (70°F)66 mm (2.6 inches)69%very high
October Weather14°C (58°F)119 mm (4.7 inches)76%high
November Weather5°C (42°F)81 mm (3.2 inches)88%moderate
December Weather2°C (36°F)67 mm (2.7 inches)87%moderate

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