May Weather in Hillsboro, United States

Last updated: June 24, 2025

In Hillsboro, United States, the average temperature in May is a pleasant 24°C (75°F), making it an inviting time to visit. However, temperatures can vary significantly, with a minimum of 8°C (47°F) and soaring up to a sizzling 36°C (97°F). Be prepared for wet days, as precipitation averages 176 mm (6.9 in) over 13 days in the month. With an average humidity of 81%, you might find the air a bit muggy, so dress accordingly!

May Temperature in Hillsboro

In May in Hillsboro, the average temperature is 24°C (75°F). Maximum temperatures can reach 36°C (97°F), while minimums can dip as low as 8°C (47°F). This varied climate makes Hillsboro an ideal destination for travelers seeking a mix of warm and cool experiences.

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 24°C (75°F), with highs reaching up to 36°C (97°F) and lows dropping to around 8°C (47°F).

Data source: Temperature data for Hillsboro generated using information from the Copernicus Climate Change Service.

May Precipitation in Hillsboro

In Hillsboro in May, the precipitation amount is 176 mm (6.9 in) spread over 13 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 176 mm (6.9 inches) of precipitation spread over approximately 13 days.

Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

May Humidity in Hillsboro

In Hillsboro in May humidity is 81%. With an average temperature of 24°C (75°F), this humidity feels like a warm, thick blanket enveloping you, making traveling a bit sticky and sweaty, yet still inviting for those who enjoy the rich, tropical atmosphere.

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 81%, offering insight into how humid the weather typically is during this month.

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.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	9°C (49°F)	59 mm (2.3 inches)	79%	moderate
February Weather	10°C (51°F)	86 mm (3.4 inches)	80%	high
March Weather	16°C (62°F)	85 mm (3.3 inches)	78%	very high
April Weather	19°C (67°F)	102 mm (4.0 inches)	79%	very high
May Weather	24°C (75°F)	176 mm (6.9 inches)	81%	extreme
June Weather	28°C (82°F)	70 mm (2.8 inches)	77%	extreme
July Weather	30°C (86°F)	55 mm (2.2 inches)	71%	extreme
August Weather	30°C (86°F)	91 mm (3.6 inches)	67%	extreme
September Weather	27°C (80°F)	77 mm (3.1 inches)	69%	very high
October Weather	21°C (69°F)	131 mm (5.2 inches)	73%	very high
November Weather	14°C (58°F)	44 mm (1.7 inches)	82%	high
December Weather	12°C (53°F)	56 mm (2.2 inches)	87%	moderate