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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 22°C (72°F), creating a pleasant climate for outdoor activities. However, temperatures can vary significantly, with a minimum of 6°C (43°F) and a maximum of 34°C (93°F). Be prepared for some moisture, as precipitation averages 105 mm (4.1 in) over 11 days, and expect a high humidity level of 83%.

May Temperature in Hillsboro

In May in Hillsboro, the average temperature is 22°C (72°F). Maximum temperatures can reach 34°C (93°F), while minimum temperatures can drop to as low as 6°C (43°F). This variety makes Hillsboro an ideal destination for travelers seeking both warm days and cooler evenings.

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 22°C (72°F), with highs reaching up to 34°C (93°F) and lows dropping to around 6°C (43°F).
JanFebMarAprMayJunJulAugSepOctNovDec444956627278818076665148
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 105 mm (4.1 in) over the course 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 105 mm (4.1 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec1141781751471051189910710210871144
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 83%. With average temperature 22°C (72°F), this humidity feels like a heavy blanket wrapping around you, making outdoor activities challenging and prompting travelers to seek shade or frequent stops for hydration.

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 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%87%85%82%83%82%78%67%64%75%87%89%
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.
JanFebMarAprMayJunJulAugSepOctNovDec46810111111109754
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 Weather7°C (44°F)114 mm (4.5 inches)87%moderate
February Weather9°C (49°F)178 mm (7.0 inches)87%high
March Weather13°C (56°F)175 mm (6.9 inches)85%very high
April Weather17°C (62°F)147 mm (5.8 inches)82%very high
May Weather22°C (72°F)105 mm (4.1 inches)83%extreme
June Weather25°C (78°F)118 mm (4.7 inches)82%extreme
July Weather27°C (81°F)99 mm (3.9 inches)78%extreme
August Weather27°C (80°F)107 mm (4.2 inches)67%very high
September Weather24°C (76°F)102 mm (4.0 inches)64%very high
October Weather19°C (66°F)108 mm (4.2 inches)74%high
November Weather11°C (51°F)71 mm (2.8 inches)87%moderate
December Weather9°C (48°F)144 mm (5.7 inches)88%moderate

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