January Weather in San Jose, Argentina

Last updated: August 22, 2025

In January, the average temperature in San Jose, Argentina hovers around 27°C (80°F). However, you can experience a wide range, with minimums dipping to 15°C (59°F) and maximums soaring to 40°C (105°F). Expect 168 mm (6.6 in) of precipitation over 13 days, contributing to the region's average humidity of 77%.

January Temperature in San Jose

In January in San Jose, the average temperature is 27°C (80°F). Maximums can reach 40°C (105°F), while minimums can drop to as low as 15°C (59°F). Travelers should prepare for warm weather and occasional fluctuations in temperature.

January Weather in San Jose: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in San Jose, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Jose, January typically has an average temperature of 27°C (80°F), with highs reaching up to 40°C (105°F) and lows dropping to around 15°C (59°F).

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

January Precipitation in San Jose

In San Jose in January, the total precipitation amount is 168 mm (6.6 in) over the course of 13 days.

January Precipitation Trends in San Jose

The chart displays monthly precipitation patterns in San Jose, 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 San Jose, January typically receives around 168 mm (6.6 inches) of precipitation spread over approximately 13 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 San Jose

In San Jose in January humidity is 77%. With an average temperature of 27°C (80°F), this humidity feels like walking through a warm, damp blanket that clings to your skin, making outdoor activities feel more strenuous and requiring frequent breaks and hydration for comfort.

January Average Humidity in San Jose

This chart illustrates the average monthly humidity levels in San Jose, 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 San Jose is approximately 77%, 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 San Jose

In San Jose in January, the maximum UV index reaches an alarming 15, which falls into the extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take precautions. For detailed information, you can check the Hourly UV Index in San Jose.

Maximum UV Index Levels in San Jose for January

The chart shows the monthly maximum UV Index (UVI) for San Jose 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 San Jose typically reaches 15, which falls under the extreme exposure category.

Data source: San Jose 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 San Jose Compares to Other Months

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

This table compares monthly weather conditions in San Jose, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	27°C (80°F)	168 mm (6.6 inches)	77%	extreme
February Weather	26°C (78°F)	106 mm (4.2 inches)	71%	extreme
March Weather	24°C (76°F)	135 mm (5.3 inches)	74%	extreme
April Weather	21°C (71°F)	123 mm (4.8 inches)	82%	very high
May Weather	18°C (64°F)	197 mm (7.8 inches)	82%	high
June Weather	16°C (62°F)	99 mm (3.9 inches)	73%	moderate
July Weather	16°C (60°F)	96 mm (3.8 inches)	67%	high
August Weather	17°C (63°F)	80 mm (3.2 inches)	49%	high
September Weather	20°C (68°F)	103 mm (4.1 inches)	54%	very high
October Weather	22°C (72°F)	152 mm (6.0 inches)	58%	extreme
November Weather	24°C (75°F)	143 mm (5.6 inches)	69%	extreme
December Weather	26°C (79°F)	93 mm (3.7 inches)	84%	extreme