January Weather in San Antonio, Argentina

Last updated: August 22, 2025

The average temperature in San Antonio, Argentina during January is a pleasant 21°C (69°F). Expect a range from a cool 12°C (54°F) to a warm 32°C (90°F) throughout the month. Be prepared for 223 mm (8.8 in) of precipitation spread over approximately 21 days, and note that the average humidity sits at a high 84%.

January Temperature in San Antonio

In January in San Antonio, the average temperature is 21°C (69°F). Maximum temperatures can reach 32°C (90°F), while minimums can drop as low as 12°C (54°F). This makes it a great time for travelers to enjoy a comfortable and varied climate while exploring the area.

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

The chart illustrates January temperature patterns in San Antonio, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Antonio, January typically has an average temperature of 21°C (69°F), with highs reaching up to 32°C (90°F) and lows dropping to around 12°C (54°F).

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

January Precipitation in San Antonio

In San Antonio in January, the total precipitation amount is 223 mm (8.8 in) spread over a period of 21 days.

January Precipitation Trends in San Antonio

The chart displays monthly precipitation patterns in San Antonio, 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 Antonio, January typically receives around 223 mm (8.8 inches) of precipitation spread over approximately 21 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 Antonio

In San Antonio in January, humidity is 84%. With an average temperature of 21°C (69°F), this humidity feels like a thick blanket enveloping you, making even the simplest outdoor activities feel exhausting and sticky, which can be quite challenging for traveling.

January Average Humidity in San Antonio

This chart illustrates the average monthly humidity levels in San Antonio, 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 Antonio is approximately 84%, 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 Antonio

In San Antonio in January, the maximum UV index is 16, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, making it crucial to take protective measures. For detailed information, you can refer to the Hourly UV Index in San Antonio.

Maximum UV Index Levels in San Antonio for January

The chart shows the monthly maximum UV Index (UVI) for San Antonio 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 Antonio typically reaches 16, which falls under the extreme exposure category.

Data source: San Antonio 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 Antonio Compares to Other Months

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

This table compares monthly weather conditions in San Antonio, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	21°C (69°F)	223 mm (8.8 inches)	84%	extreme
February Weather	19°C (67°F)	237 mm (9.3 inches)	87%	extreme
March Weather	18°C (65°F)	282 mm (11.1 inches)	88%	extreme
April Weather	16°C (61°F)	267 mm (10.5 inches)	85%	extreme
May Weather	13°C (56°F)	155 mm (6.1 inches)	74%	very high
June Weather	11°C (52°F)	55 mm (2.2 inches)	56%	high
July Weather	11°C (52°F)	45 mm (1.8 inches)	47%	high
August Weather	12°C (55°F)	52 mm (2.1 inches)	44%	very high
September Weather	15°C (60°F)	85 mm (3.4 inches)	57%	extreme
October Weather	18°C (64°F)	201 mm (7.9 inches)	55%	extreme
November Weather	19°C (66°F)	241 mm (9.5 inches)	70%	extreme
December Weather	20°C (68°F)	272 mm (10.7 inches)	77%	extreme