January Weather in Rio, United States

Last updated: August 27, 2025

In January, the average temperature in Rio, United States hovers around -6°C (21°F). While the mercury can plunge to a chilling -33°C (-27°F), it may occasionally reach a balmy 10°C (50°F). During this time, expect about 47 mm (1.9 in) of precipitation over 7 days, coupled with an average humidity of a brisk 85%. Stay warm and prepared for a wintery experience!

January Temperature in Rio

In January, in Rio, the average temperature is -6°C (21°F). The maximum can reach 10°C (50°F) and the minimum can be as low as -33°C (-27°F). Travelers should prepare for cold weather conditions and pack accordingly for their visit.

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

The chart illustrates January temperature patterns in Rio, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Rio, January typically has an average temperature of -6°C (21°F), with highs reaching up to 10°C (50°F) and lows dropping to around -33°C (-27°F).

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

January Precipitation in Rio

In Rio in January, the total precipitation amount is 47 mm (1.9 in) recorded over a span of 7 days.

January Precipitation Trends in Rio

The chart displays monthly precipitation patterns in Rio, 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 Rio, January typically receives around 47 mm (1.9 inches) of precipitation spread over approximately 7 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 Rio

In Rio 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 Rio

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

In Rio in January, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Rio, you can check the information here.

Maximum UV Index Levels in Rio for January

The chart shows the monthly maximum UV Index (UVI) for Rio 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 Rio typically reaches 3, which falls under the moderate exposure category.

Data source: Rio 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 Rio Compares to Other Months

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

This table compares monthly weather conditions in Rio, 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)	47 mm (1.9 inches)	85%	moderate
February Weather	-6°C (21°F)	52 mm (2.0 inches)	85%	moderate
March Weather	2°C (35°F)	58 mm (2.3 inches)	85%	moderate
April Weather	7°C (45°F)	98 mm (3.9 inches)	85%	very high
May Weather	15°C (59°F)	127 mm (5.0 inches)	78%	very high
June Weather	21°C (70°F)	112 mm (4.4 inches)	80%	very high
July Weather	23°C (74°F)	103 mm (4.1 inches)	78%	very high
August Weather	22°C (71°F)	100 mm (3.9 inches)	76%	very high
September Weather	18°C (65°F)	98 mm (3.8 inches)	79%	high
October Weather	10°C (51°F)	113 mm (4.5 inches)	83%	moderate
November Weather	2°C (36°F)	44 mm (1.7 inches)	88%	moderate
December Weather	-2°C (28°F)	46 mm (1.8 inches)	81%	low