San Antonio, TX weather in January
Expect cool weather with some rain in San Antonio in January, with highs near 63°F and lows near 41°F. Rain falls on about 7 days. It is one of the coolest months in San Antonio. Good for outdoor plans.
- Normal high
- 63°F
- Normal low
- 41°F
- Wet days
- 7
- 2.0 in total
- Muggy days
- 0
- dew point 65°F+
How January changes from start to finish
| January 1 | January 31 | |
|---|---|---|
| Normal high | 63°F | 65°F |
| Normal low | 41°F | 42°F |
| Chance of a wet day | 23% | 23% |
| Sunrise / sunset | 7:28 am / 5:46 pm | 7:23 am / 6:11 pm |
| Daylight | 10.3 h | 10.8 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Central Time).
A typical January day
- 6 am45°Fdew point 39°F
- 9 am49°Fdew point 41°F
- Noon59°Fdew point 42°F
- 3 pm63°Fdew point 41°F
- 6 pm59°Fdew point 41°F
- 9 pm52°Fdew point 41°F
NOAA hourly normals (local standard time) from San Antonio Kelly AFB (6 mi away); average wind 7 mph.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F13 of 31
- Hot dayshigh 90°F or more0 of 31
- Muggy daysdaily mean dew point 65°F or more0 of 31
- Wet daysat least 0.01 in of rain or melted snow7 of 31
- Notable rainat least 0.10 in4 of 31
- Freezing nightslow 32°F or below5 of 31
Average days per January, counted from daily records for each year 1991-2020.
Rain in January
Normal precipitation is 2.0 in; a dry January brings about 0.4 in and a wet one about 2.9 in (25th and 75th percentiles). About 1 day brings half an inch or more, and about 1 an inch or more. Snow is very rare.
How January varies from year to year
- Warmest January, 1991-20202006: average high 73°F
- Coolest January2007: average high 57°F
- Wettest January1992: 5.6 in
- Driest January1996: no measurable precipitation
- Highest reading86°F (January 29, 2013)
- Lowest reading16°F (January 9, 2010)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
January compared with December and February
| December | January | February | |
|---|---|---|---|
| Normal high | 65°F | 63°F | 68°F |
| Normal low | 42°F | 41°F | 45°F |
| Wet days | 8 | 7 | 7 |
| Comfortable days | 14 | 13 | 14 |
| Daylight | 10.3 h | 10.5 h | 11.2 h |
Highs change by -2°F from December and +5°F into February.
Nearby alternatives in January
- Warmer: Laredo, TX146 mi · high 68°F · 5 wet days
- Cooler: Fort Worth, TX238 mi · high 56°F · 6 wet days
How San Antonio ranks in January
- Normal high80th warmest of 378 cities; 13th of 38 in Texas
- Wet days101st driest of 378
- Comfortable days50th most of 339
Heating and cooling
January has 406 heating degree days and 7 cooling degree days (base 65°F), 9% of the year's total heating and cooling demand.
Questions
How cold is San Antonio in January?
The normal high is 63°F and the normal low is 41°F. From 1991 to 2020 the coldest January reading was 16°F (January 9, 2010).
Does it rain a lot in San Antonio in January?
About 7 days in January have at least 0.01 in of precipitation, and the normal total is 2.0 in. The wettest January in 1991-2020 was in 1992 (5.6 in); the driest was in 1996, with no measurable precipitation.
Is January a good time to visit San Antonio?
January ranks 5th of 12 months on our comfort score for San Antonio (62 out of 100). It has about 13 comfortable days. The best months are February, March and November.
Where the numbers come from
- Temperature, rain, snowfall, snow depth and frost dates: San Antonio Intl Airport (USW00012921), 8.3 mi N of the city center, 789 ft (140 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour: San Antonio Kelly AFB (USW00012909), 6.1 mi WSW of the city center, 682 ft . NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: San Antonio International Airport (722530-12921), 8.3 mi N of the city center, 799 ft (150 ft higher than the city). Hourly observations, 1991-2020.
- Not available for this location: cloud cover (no station close enough or similar enough in elevation).