January Weather in Hillsboro, United States

Last updated: June 24, 2025

In January, the average temperature in Hillsboro, United States hovers around 9°C (49°F). Expect a wide range in temperatures, with lows dipping to -10°C (14°F) and highs reaching 27°C (81°F). Rain is likely, with an average precipitation of 59 mm (2.3 in) spread over 6 days, all while maintaining an average humidity of 79%.

January Temperature in Hillsboro

In January in Hillsboro, the average temperature is 9°C (49°F). Maximums can reach 27°C (81°F), while minimums can drop as low as -10°C (14°F). It's advisable to pack layers to accommodate the wide temperature range during your travels.

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 9°C (49°F), with highs reaching up to 27°C (81°F) and lows dropping to around -10°C (14°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 59 mm (2.3 in) over the course of 6 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 59 mm (2.3 inches) of precipitation spread over approximately 6 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 79%. With an average temperature of 9°C (49°F), this humidity feels like a damp chill that seeps into your bones, making it essential to dress in layers and carrying a light raincoat for a comfortable travel experience.

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 79%, 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	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