January Weather in Hillsboro, United States

Last updated: June 24, 2025

In January, the average temperature in Hillsboro, United States hovers around 7°C (44°F), with extremes ranging from a chilly -14°C (8°F) to a warm 24°C (76°F). Visitors can expect 114 mm (4.5 in) of precipitation over 9 days, accompanied by a relatively high average humidity of 87%.

January Temperature in Hillsboro

In January in Hillsboro, the average temperature is 7°C (44°F), with maximums reaching up to 24°C (76°F) and minimums dipping as low as -14°C (8°F). Be prepared for a wide range of temperatures during your travels, so pack appropriately!

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

The chart illustrates January 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, January typically has an average temperature of 7°C (44°F), with highs reaching up to 24°C (76°F) and lows dropping to around -14°C (8°F).

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

January Precipitation in Hillsboro

In Hillsboro in January, the precipitation amount is 114 mm (4.5 in) over the course of 9 days.

January Precipitation Trends in Hillsboro

The chart displays monthly precipitation patterns in Hillsboro, with values for each month alongside January’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how January’s conditions compare to those of other months. In Hillsboro, January typically receives around 114 mm (4.5 inches) of precipitation spread over approximately 9 days.

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

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Millimeters (mm) Inches (in)

January Humidity in Hillsboro

In Hillsboro in January, humidity is 87%. With an average temperature of 7°C (44°F), this humidity feels like a damp chill that seeps into your bones, making outdoor activities uncomfortable and requiring travelers to layer up to stay warm and dry.

January Average Humidity in Hillsboro

This chart illustrates the average monthly humidity levels in Hillsboro, with January’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In January, average humidity in Hillsboro is approximately 87%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in Hillsboro

In Hillsboro in January, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Hillsboro for better planning.

Maximum UV Index Levels in Hillsboro for January

The chart shows the monthly maximum UV Index (UVI) for Hillsboro in January, 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 January, the maximum UV index in Hillsboro typically reaches 4, which falls under the moderate exposure category.

Data source: Hillsboro January 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 January 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 January’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 January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	7°C (44°F)	114 mm (4.5 inches)	87%	moderate
February Weather	9°C (49°F)	178 mm (7.0 inches)	87%	high
March Weather	13°C (56°F)	175 mm (6.9 inches)	85%	very high
April Weather	17°C (62°F)	147 mm (5.8 inches)	82%	very high
May Weather	22°C (72°F)	105 mm (4.1 inches)	83%	extreme
June Weather	25°C (78°F)	118 mm (4.7 inches)	82%	extreme
July Weather	27°C (81°F)	99 mm (3.9 inches)	78%	extreme
August Weather	27°C (80°F)	107 mm (4.2 inches)	67%	very high
September Weather	24°C (76°F)	102 mm (4.0 inches)	64%	very high
October Weather	19°C (66°F)	108 mm (4.2 inches)	74%	high
November Weather	11°C (51°F)	71 mm (2.8 inches)	87%	moderate
December Weather	9°C (48°F)	144 mm (5.7 inches)	88%	moderate