San Antonio Weather in January
January in San Antonio sees daytime temperatures around 18°C (64°F) and lows of 4°C (39°F) at night. Pack a rain jacket because some rainfall is likely.
Rainfall in San Antonio in January
Analyzing past climate data, one can expect approximately 7 days of rain, averaging 59 mm (2.3 in). When showers do arrive, they tend to be on the heavier side. Worth being prepared even if rain days are not that numerous.
Temperature in San Antonio in January
January in San Antonio brings typical temperatures with highs around 18°C (64°F) and lows of 4°C (39°F). January is in the winter season. Even when the weather is stable, mornings and evenings can still feel distinctly cool. Nights drop to 4°C (39°F). Cold nights like these are actually great for sleeping well, as long as you have a warm enough duvet. Enjoy a month of mild temperatures, still offering warmth and comfort throughout.
Sunshine in San Antonio in January
The area enjoys a balanced 160 hours of sunlight, ensuring it's neither too overcast nor too sunny.If your ideal day consists of dry skies and pleasant temperatures, February, March, April, October and November typically offer the best circumstances for San Antonio.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our San Antonio's climate page.
San Antonio Temperature in January
Min Temperature
4°C (39°F)
Max Temperature
18°C (64°F)
Chance of Rain
23%
Precipitation
59 mm (2.3 in)
Rainy days
7 days
Humidity
67%
Sunshine
160 hours
Percentage Sunshine
49%
Daily Historical Temperatures
51-year average (1976-2026)
Based on our historical records, temperatures in San Antonio typically stay consistent throughout January, with daily highs averaging around 18°C (64°F). Nights are cold, with lows typically ranging from 4°C (39°F) to 6°C (43°F).
Average temperatures in January
Daily Historical Precipitation
51-year average (1976-2026)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in January
Historical weather for San Antonio in January
Browse day-by-day weather records for San Antonio spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
San Antonio historical weather extremes in January
The extremes listed below come from historical weather data collected in San Antonio from 1976 through 2025.
- The warmest day in January was on January 21, 2017, with a maximum of 30°C (86°F).
- San Antonio registered its coldest January night on January 11, 1982, with temperatures dropping to -9°C (16°F).
Best Places in the United States of America in January
Find out more about the weather in the United States of America and which places have the best travel conditions in this month. See all of the United States of America in January →
perfect weather
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tolerable
unpleasant
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What to Wear in San Antonio in January
Pleasant temperatures in January mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Rain gear is recommended, you can expect wet weather on multiple days. Bring sunglasses since you'll have some sunny periods throughout the monthWhat To Do in San Antonio in January
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our San Antonio's climate page.
Temperature Rainfall Sunshine Humidity
See the full San Antonio climate overview or explore weather in the United States of America.
