January Weather in Portage, United States

Last updated: August 27, 2025

In Portage, United States, the average temperature in January hovers around -6°C (21°F). However, temperatures can plunge to a chilling -33°C (-26°F) or peak at a mild 10°C (49°F). Expect about 46 mm (1.8 in) of precipitation spread over 8 days, with an average humidity level of 85%.

January Temperature in Portage

In January in Portage, the average temperature is -6°C (21°F). Maximums can reach 10°C (49°F) while minimums can drop to -33°C (-26°F). Travelers should be prepared for extreme temperature fluctuations and pack accordingly for their visit.

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

The chart illustrates January temperature patterns in Portage, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Portage, January typically has an average temperature of -6°C (21°F), with highs reaching up to 10°C (49°F) and lows dropping to around -33°C (-26°F).

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

January Precipitation in Portage

In Portage in January, the precipitation amount is 46 mm (1.8 in) over the course of 8 days.

January Precipitation Trends in Portage

The chart displays monthly precipitation patterns in Portage, 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 Portage, January typically receives around 46 mm (1.8 inches) of precipitation spread over approximately 8 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 Portage

In Portage in January, humidity is 85%. With an average temperature of -6°C (21°F), this humidity feels like a damp chill that seeps into your bones, making travel uncomfortable and forcing you to bundle up even more than usual as you navigate through frosty air.

January Average Humidity in Portage

This chart illustrates the average monthly humidity levels in Portage, 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 Portage 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 Portage

In Portage 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 Portage, you can visit Hourly UV Index in Portage.

Maximum UV Index Levels in Portage for January

The chart shows the monthly maximum UV Index (UVI) for Portage 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 Portage typically reaches 2, which falls under the low exposure category.

Data source: Portage 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 Portage Compares to Other Months

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

This table compares monthly weather conditions in Portage, 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 (21°F)	46 mm (1.8 inches)	85%	low
February Weather	-6°C (21°F)	53 mm (2.1 inches)	85%	moderate
March Weather	2°C (35°F)	58 mm (2.3 inches)	85%	moderate
April Weather	7°C (45°F)	95 mm (3.8 inches)	85%	very high
May Weather	15°C (59°F)	127 mm (5.0 inches)	78%	very high
June Weather	21°C (70°F)	113 mm (4.4 inches)	80%	very high
July Weather	23°C (74°F)	95 mm (3.7 inches)	78%	very high
August Weather	21°C (71°F)	105 mm (4.1 inches)	76%	very high
September Weather	18°C (65°F)	101 mm (4.0 inches)	79%	high
October Weather	10°C (51°F)	111 mm (4.4 inches)	83%	moderate
November Weather	2°C (36°F)	44 mm (1.7 inches)	88%	moderate
December Weather	-2°C (28°F)	45 mm (1.8 inches)	81%	low