January Weather in Hillsborough, United States

Last updated: June 24, 2025

In January, the average temperature in Hillsborough, United States hovers around 6°C (43°F). Temperatures can swing dramatically, with a minimum dips to -15°C (6°F) and a maximum reaching 25°C (77°F). Expect about 89 mm (3.5 in) of precipitation over 9 days, all while managing a fairly high average humidity of 85%.

January Temperature in Hillsborough

In January in Hillsborough, the average temperature is 6°C (43°F). Maximums can reach 25°C (77°F), while minimums can drop as low as -15°C (6°F). Be sure to pack layers to accommodate the wide range of temperatures!

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

The chart illustrates January temperature patterns in Hillsborough, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Hillsborough, January typically has an average temperature of 6°C (43°F), with highs reaching up to 25°C (77°F) and lows dropping to around -15°C (6°F).

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

January Precipitation in Hillsborough

In Hillsborough in January, the precipitation amount is 89 mm (3.5 in) during a span of 9 days.

January Precipitation Trends in Hillsborough

The chart displays monthly precipitation patterns in Hillsborough, 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 Hillsborough, January typically receives around 89 mm (3.5 inches) of precipitation spread over approximately 9 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

January Humidity in Hillsborough

In Hillsborough in January, humidity is 85%. With an average temperature of 6°C (43°F), this humidity feels like a damp chill that seeps into your bones, making travel feel more uncomfortable and limiting your enjoyment of the sights as you navigate the wet, brisk air.

January Average Humidity in Hillsborough

This chart illustrates the average monthly humidity levels in Hillsborough, 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 Hillsborough is approximately 85%, 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 Hillsborough

In Hillsborough 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 Hillsborough for better planning.

Maximum UV Index Levels in Hillsborough for January

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

Data source: Hillsborough 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 Hillsborough Compares to Other Months

Weather in Hillsborough varies notably across the year, with each month offering distinct climate conditions. This page compares January’s weather to other months in Hillsborough, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Hillsborough, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	6°C (43°F)	89 mm (3.5 inches)	85%	moderate
February Weather	9°C (48°F)	117 mm (4.6 inches)	82%	high
March Weather	11°C (53°F)	84 mm (3.3 inches)	81%	very high
April Weather	16°C (62°F)	116 mm (4.6 inches)	80%	very high
May Weather	21°C (70°F)	118 mm (4.6 inches)	81%	extreme
June Weather	24°C (76°F)	121 mm (4.8 inches)	81%	extreme
July Weather	27°C (80°F)	114 mm (4.5 inches)	81%	extreme
August Weather	26°C (78°F)	128 mm (5.1 inches)	80%	very high
September Weather	23°C (74°F)	128 mm (5.1 inches)	79%	very high
October Weather	18°C (65°F)	97 mm (3.8 inches)	80%	very high
November Weather	10°C (51°F)	81 mm (3.2 inches)	85%	moderate
December Weather	8°C (46°F)	107 mm (4.2 inches)	86%	moderate