January Weather in Portal, United States

Last updated: June 24, 2025

In Portal, United States, the average temperature in January hovers around 11°C (51°F), with a notable range that can dip as low as -7°C (20°F) and peak at a warm 28°C (83°F). During this time, expect about 81 mm (3.2 in) of precipitation across 8 days, contributing to an average humidity of 86%. Be prepared for a mix of chilly and warm days while navigating the occasional rain!

January Temperature in Portal

In January in Portal, the average temperature is 11°C (51°F). Maximums can reach 28°C (83°F), while minimums can drop as low as -7°C (20°F). Travelers should be prepared for a wide range of temperatures when planning their visit.

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

The chart illustrates January temperature patterns in Portal, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Portal, January typically has an average temperature of 11°C (51°F), with highs reaching up to 28°C (83°F) and lows dropping to around -7°C (20°F).

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

January Precipitation in Portal

In Portal in January, the precipitation amount is 81 mm (3.2 in) over the course of 8 days.

January Precipitation Trends in Portal

The chart displays monthly precipitation patterns in Portal, 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 Portal, January typically receives around 81 mm (3.2 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 Portal

In Portal in January humidity is 86%. With an average temperature of 11°C (51°F), this humidity feels like a damp blanket wrapping around you, making outdoor activities less enjoyable and travel a bit more strenuous as the air feels heavy and clammy.

January Average Humidity in Portal

This chart illustrates the average monthly humidity levels in Portal, 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 Portal is approximately 86%, 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 Portal

In Portal 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 Portal for better planning.

Maximum UV Index Levels in Portal for January

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

Data source: Portal 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 Portal Compares to Other Months

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

This table compares monthly weather conditions in Portal, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	11°C (51°F)	81 mm (3.2 inches)	86%	moderate
February Weather	14°C (57°F)	97 mm (3.8 inches)	81%	high
March Weather	16°C (61°F)	68 mm (2.7 inches)	81%	very high
April Weather	19°C (67°F)	92 mm (3.6 inches)	79%	very high
May Weather	24°C (76°F)	78 mm (3.1 inches)	75%	extreme
June Weather	27°C (80°F)	112 mm (4.4 inches)	75%	extreme
July Weather	28°C (83°F)	127 mm (5.0 inches)	80%	extreme
August Weather	28°C (82°F)	119 mm (4.7 inches)	81%	extreme
September Weather	26°C (79°F)	87 mm (3.4 inches)	83%	very high
October Weather	22°C (72°F)	76 mm (3.0 inches)	78%	very high
November Weather	14°C (58°F)	61 mm (2.4 inches)	85%	high
December Weather	12°C (54°F)	121 mm (4.8 inches)	87%	moderate