January Weather in Rosario, Mexico

Last updated: August 26, 2025

In January, the average temperature in Rosario, Mexico hovers around 19°C (67°F). Expect a comfortable range, with minimums dipping to 9°C (48°F) and maximums peaking at 31°C (88°F). During this time, an average precipitation of 38 mm (1.5 in) is expected over 7 days, accompanied by a notable average humidity of 83%.

January Temperature in Rosario

In January in Rosario, the average temperature is 19°C (67°F). The maximum can reach 31°C (88°F), and the minimum can be as low as 9°C (48°F). This makes it an ideal time for travelers who enjoy mild weather with warm days and cooler nights.

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

The chart illustrates January temperature patterns in Rosario, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Rosario, January typically has an average temperature of 19°C (67°F), with highs reaching up to 31°C (88°F) and lows dropping to around 9°C (48°F).

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

January Precipitation in Rosario

In Rosario in January, the precipitation amount is 38 mm (1.5 in) over the course of 7 days.

January Precipitation Trends in Rosario

The chart displays monthly precipitation patterns in Rosario, 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 Rosario, January typically receives around 38 mm (1.5 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 Rosario

In Rosario in January humidity is 83%. With an average temperature of 19°C (67°F), this humidity feels like a warm, tropical blanket wrapping around you, making traveling feel a bit sluggish and sticky, yet still inviting as long as you stay hydrated and take breaks in the shade.

January Average Humidity in Rosario

This chart illustrates the average monthly humidity levels in Rosario, 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 Rosario is approximately 83%, 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 Rosario

In Rosario in January, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Rosario.

Maximum UV Index Levels in Rosario for January

The chart shows the monthly maximum UV Index (UVI) for Rosario 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 Rosario typically reaches 10, which falls under the very high exposure category.

Data source: Rosario 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 Rosario Compares to Other Months

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

This table compares monthly weather conditions in Rosario, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	19°C (67°F)	38 mm (1.5 inches)	83%	very high
February Weather	21°C (70°F)	24 mm (0.9 inches)	76%	extreme
March Weather	22°C (72°F)	27 mm (1.0 inches)	66%	extreme
April Weather	24°C (76°F)	34 mm (1.4 inches)	59%	extreme
May Weather	25°C (78°F)	91 mm (3.6 inches)	64%	extreme
June Weather	24°C (76°F)	229 mm (9.0 inches)	69%	extreme
July Weather	24°C (75°F)	124 mm (4.9 inches)	82%	extreme
August Weather	24°C (75°F)	157 mm (6.2 inches)	87%	extreme
September Weather	24°C (75°F)	212 mm (8.4 inches)	87%	extreme
October Weather	23°C (73°F)	203 mm (8.0 inches)	88%	extreme
November Weather	21°C (70°F)	71 mm (2.8 inches)	88%	very high
December Weather	20°C (68°F)	45 mm (1.8 inches)	88%	very high