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January Weather in San Antonio, Uruguay

Last updated: August 28, 2025

In January, the average temperature in San Antonio, Uruguay is a pleasant 24°C (75°F). Expect a range that can dip to a chilly 10°C (50°F) or soar to a scorching 41°C (106°F). During this month, you can anticipate 69 mm (2.7 in) of precipitation spread across 7 days, and with an average humidity of 63%, the weather balances warmth with a touch of tropical feel.

January Temperature in San Antonio

In January in San Antonio, the average temperature is 24°C (75°F), with maximums reaching 41°C (106°F) and minimums dropping as low as 10°C (50°F). This weather makes it a great time for travelers to enjoy both warm sunshine and cooler evenings.

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 24°C (75°F), with highs reaching up to 41°C (106°F) and lows dropping to around 10°C (50°F).
JanFebMarAprMayJunJulAugSepOctNovDec747369655854525457616771
Data source: Temperature data for San Antonio generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

January Precipitation in San Antonio

In San Antonio in January, the precipitation amount is 69 mm (2.7 in) over the course of 7 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 69 mm (2.7 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec699775751091061019086926765
Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.
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January Humidity in San Antonio

In San Antonio in January humidity is 63%. With an average temperature of 24°C (75°F), this humidity feels like a warm embrace, making travel both enjoyable and slightly sticky, encouraging visitors to explore the outdoors while seeking shade intermittently.

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 63%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec63%69%73%79%83%80%72%72%76%71%68%65%
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 14, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, so it's crucial to take precautions. For the detailed hourly UV index in San Antonio, you can check here.

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 14, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec141311754468111314
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.
 TemperaturePrecipitationHumidityUV
January Weather24°C (75°F)69 mm (2.7 inches)63%extreme
February Weather23°C (73°F)97 mm (3.8 inches)69%extreme
March Weather21°C (70°F)75 mm (2.9 inches)73%extreme
April Weather18°C (65°F)75 mm (3.0 inches)79%high
May Weather14°C (58°F)109 mm (4.3 inches)82%moderate
June Weather12°C (54°F)106 mm (4.2 inches)80%moderate
July Weather11°C (52°F)101 mm (4.0 inches)72%moderate
August Weather12°C (54°F)90 mm (3.5 inches)72%high
September Weather14°C (58°F)86 mm (3.4 inches)76%very high
October Weather16°C (61°F)91 mm (3.6 inches)71%extreme
November Weather19°C (67°F)67 mm (2.6 inches)68%extreme
December Weather22°C (72°F)65 mm (2.5 inches)65%extreme

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