May Weather in Hillsboro, United States

Last updated: June 24, 2025

In Hillsboro, United States, the average temperature in May hovers around 13°C (57°F). Be prepared for a range of temperatures, as lows can dip to -4°C (25°F) while highs may reach up to 34°C (94°F). With an average precipitation of 54 mm (2.1 in) spread over 9 days, expect some wet weather, complemented by an average humidity of 75%.

May Temperature in Hillsboro

In May in Hillsboro, the average temperature is 13°C (57°F). Maximum temperatures can reach 34°C (94°F), while minimums can drop as low as -4°C (25°F). Travelers should be prepared for a wide range of temperatures in this region during the month.

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 13°C (57°F), with highs reaching up to 34°C (94°F) and lows dropping to around -4°C (25°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 54 mm (2.1 in) over a span of 9 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 54 mm (2.1 inches) of precipitation spread over approximately 9 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

May Humidity in Hillsboro

In Hillsboro in May humidity is 75%. With average temperature 13°C (57°F), this humidity feels like a damp chill, making it essential for travelers to dress in layers and be prepared for a slightly uncomfortable experience while exploring the area.

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 75%, 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 is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to 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 8, which falls under the very high 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	-12°C (10°F)	18 mm (0.7 inches)	90%	low
February Weather	-13°C (9°F)	20 mm (0.8 inches)	92%	moderate
March Weather	-3°C (27°F)	26 mm (1.0 inches)	85%	moderate
April Weather	4°C (40°F)	43 mm (1.7 inches)	81%	high
May Weather	13°C (57°F)	54 mm (2.1 inches)	75%	very high
June Weather	21°C (69°F)	90 mm (3.5 inches)	79%	very high
July Weather	22°C (73°F)	60 mm (2.4 inches)	76%	very high
August Weather	20°C (69°F)	85 mm (3.4 inches)	78%	very high
September Weather	16°C (60°F)	72 mm (2.8 inches)	77%	high
October Weather	7°C (44°F)	80 mm (3.2 inches)	79%	moderate
November Weather	-2°C (28°F)	23 mm (0.9 inches)	86%	moderate
December Weather	-8°C (18°F)	39 mm (1.6 inches)	86%	low