January Weather in Hillsboro, United States

Last updated: June 24, 2025

In January, the average temperature in Hillsboro, United States hovers around -7°C (20°F). Be prepared for a range of temperatures, with minimums plunging to -33°C (-27°F) and maximums reaching up to 9°C (48°F). During this period, expect approximately 41 mm (1.6 in) of precipitation spread over 7 days, coupled with an average humidity of 84%—setting the scene for a chilly and damp winter experience!

January Temperature in Hillsboro

In January in Hillsboro, the average temperature is -7°C (20°F). Maximums can reach 9°C (48°F), while minimums can plummet to -33°C (-27°F). It’s advisable to pack warm clothing and plan indoor activities to enjoy your visit comfortably.

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 (20°F), with highs reaching up to 9°C (48°F) and lows dropping to around -33°C (-27°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 41 mm (1.6 in) spread over a duration of 7 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 41 mm (1.6 inches) of precipitation spread over approximately 7 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 84%. With an average temperature of -7°C (20°F), this humidity feels like a damp chill that seeps into your bones, making traveling uncomfortable and requiring extra layers 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 84%, 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 is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Hillsboro, you can visit Hourly UV Index in Hillsboro.

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 2, which falls under the low 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 (20°F)	41 mm (1.6 inches)	84%	low
February Weather	-6°C (21°F)	54 mm (2.1 inches)	85%	moderate
March Weather	1°C (35°F)	59 mm (2.3 inches)	84%	moderate
April Weather	7°C (45°F)	91 mm (3.6 inches)	83%	very high
May Weather	15°C (59°F)	137 mm (5.4 inches)	75%	very high
June Weather	21°C (70°F)	119 mm (4.7 inches)	79%	very high
July Weather	23°C (74°F)	107 mm (4.2 inches)	75%	very high
August Weather	21°C (70°F)	116 mm (4.6 inches)	69%	very high
September Weather	18°C (64°F)	110 mm (4.3 inches)	74%	very high
October Weather	10°C (50°F)	111 mm (4.4 inches)	79%	moderate
November Weather	2°C (35°F)	51 mm (2.0 inches)	88%	moderate
December Weather	-3°C (27°F)	46 mm (1.8 inches)	82%	low