Weather in San Antonio in January 2026
- January is usually the coldest month of the year in San Antonio;
Average weather
Average temperature in San Antonio in January
The temperature in January is +22°C on average, with a range between a maximum of +29°C during the day and a minimum of 0°C at night.
The average maximum temperature goes down 86% by the end of the month, compared with the beginning of the month, from +27°C to +2°C.
Is San Antonio warm or cold in January?
San Antonio is typically mild in January.
Maximum temperatures go down compared to the previous month from +19°C to +18°C. The minimum temperature also goes down from +8°C to +6°C.
Pack a light jacket as it will be warm in the day and cool in the evenings.
January is the coldest month in San Antonio, here is the comparison with other months:
Climate in San Antonio in January
| December | January | February | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +19°C | +18°C | +20°C | ||||
| Min. temperature | ||||||
| -13°C | -9°C | -12°C | ||||
| Max. temperature | ||||||
| +32°C | +30°C | +37°C | ||||
| Rainfall | ||||||
| 53 mm | 50 mm | 50 mm | ||||
| Wind | ||||||
| 3 m/s | 3 m/s | 3 m/s | ||||
| Humidity | ||||||
| 71% | 70% | 70% | ||||
| Air pressure | ||||||
| 1019 HPa | 1019 HPa | 1017 HPa | ||||
| Sunny days | ||||||
| 10 | 10 | 8 | ||||
| Cloudy days | ||||||
| 9 | 9 | 9 | ||||
| Rainy days | ||||||
| 12 | 11 | 10 | ||||
| Snowy days | ||||||
| 0 | 1 | 1 | ||||
January weather is still as good as in December. It’s getting colder in January. From +19°C in the day, the average maximum temperature lowers to +18°C. As January arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 53 mm to 50 mm. It feels drier, as humidity decreases from 71% to 70%. The average wind speed doesn’t change much during January, staying around 3 m/s. The amount of sunny days stay about the same, averaging 10 sunny days during the month.
February brings much the same weather, it remains good.
Wind
The average wind speed is 4 m/s getting up to 7 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in San Antonio is gradually increasing during January, going from 2 m/s to 5 m/s over the course of the month.
Rain
Snow
January is one of the snowiest months in San Antonio.
Here’s how January is compared with other months in the amount of snow, total mm:
How was the weather last January in San Antonio?
Climate Change over Years
The climate in San Antonio in January has not changed much over the last 43 years.
The average temperature was the lowest in 1983 (+25°C) and the highest in 2006 (+30°C). The driest year was 1996 with only 401 mm of rainfall, and the wettest year was 2007 with 1606 mm.
FAQ
Is January a good time to visit San Antonio?
Can you sunbathe in San Antonio in January?
Is San Antonio rainy in January?
Is it sunny in San Antonio in January?
Other cities in USA
Monthly weather in San Antonio
Source of the data
For this page, we’ve looked at the typical weather in San Antonio, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.
