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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 23°C (74°F). Visitors should be prepared for a minimum temperature of 8°C (46°F) and a possible maximum of 35°C (95°F). With an average humidity of 82%, the atmosphere can feel quite sticky. Additionally, expect about 132 mm (5.2 in) of precipitation over approximately 11 days, so don’t forget your umbrella!

May Temperature in Hillsboro

In May in Hillsboro, the average temperature is 23°C (74°F). Maximums can reach 35°C (95°F), while minimums can drop as low as 8°C (46°F). This makes Hillsboro an ideal destination for travelers seeking a pleasant and varied climate.

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 23°C (74°F), with highs reaching up to 35°C (95°F) and lows dropping to around 8°C (46°F).
JanFebMarAprMayJunJulAugSepOctNovDec485360647379818178685551
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 132 mm (5.2 in), which occurs over a span of 11 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 132 mm (5.2 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec1091591261631321551091381009671121
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 82%. With an average temperature of 23°C (74°F), this humidity feels like you are walking through a warm, damp blanket, making travel a bit uncomfortable and sticky as you navigate the air thick with moisture.

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 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%84%82%82%82%79%82%77%74%73%85%88%
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 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 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 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec478111112111110864
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 Weather9°C (48°F)109 mm (4.3 inches)85%moderate
February Weather12°C (53°F)159 mm (6.3 inches)84%high
March Weather16°C (60°F)126 mm (5.0 inches)82%very high
April Weather18°C (64°F)163 mm (6.4 inches)82%extreme
May Weather23°C (74°F)132 mm (5.2 inches)82%extreme
June Weather26°C (79°F)155 mm (6.1 inches)79%extreme
July Weather27°C (81°F)109 mm (4.3 inches)82%extreme
August Weather27°C (81°F)138 mm (5.4 inches)77%extreme
September Weather25°C (78°F)100 mm (3.9 inches)74%very high
October Weather20°C (69°F)96 mm (3.8 inches)73%very high
November Weather13°C (55°F)70 mm (2.8 inches)85%high
December Weather11°C (52°F)121 mm (4.8 inches)88%moderate

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