Climateby Month

San Antonio, TX climate by month

NOAA 1991-2020 normals · 649 ft elevation

San Antonio has hot and oppressively humid summers and cool winters. Highs peak at 96°F in August and fall to 63°F in January. Wet days are spread through the year, from about 5 to 9 a month. Snow is rare. By our comfort score the best months are February, March and November.

Warmest month
96°F
August normal high
Coldest month
41°F
January normal low
Wet days a year
81
32.4 in of precipitation
Muggy days a year
148
dew point 65°F or higher

How warm is San Antonio?

Normal highs range from 63°F in January to 96°F in August.

40°60°80°100° January: normal high 63°F (17°C), low 41°F (5°C) 63° 41° February: normal high 68°F (20°C), low 45°F (7°C) March: normal high 74°F (23°C), low 52°F (11°C) April: normal high 80°F (27°C), low 58°F (14°C) May: normal high 87°F (31°C), low 66°F (19°C) June: normal high 92°F (33°C), low 73°F (23°C) July: normal high 95°F (35°C), low 75°F (24°C) August: normal high 96°F (36°C), low 75°F (24°C) 96° 75° September: normal high 90°F (32°C), low 70°F (21°C) October: normal high 82°F (28°C), low 60°F (16°C) November: normal high 72°F (22°C), low 50°F (10°C) December: normal high 65°F (18°C), low 42°F (6°C) JFMAMJJASOND

Bars run from the normal low to the normal high for each month.

How rainy is San Antonio?

March has the most wet days (about 9); the year brings about 32 in of precipitation.

January: 7 wet days February: 7 wet days March: 9 wet days 9 April: 6 wet days May: 8 wet days June: 7 wet days July: 5 wet days August: 5 wet days 5 September: 7 wet days October: 6 wet days November: 6 wet days December: 8 wet days JFMAMJJASOND

Wet day: at least 0.01 in of rain or melted snow, counted from daily records 1991-2020.

How humid is San Antonio?

Muggy days peak in July, at about 30 days.

January: 0 muggy days 0 February: 1 muggy days March: 2 muggy days April: 7 muggy days May: 19 muggy days June: 27 muggy days July: 30 muggy days 30 August: 28 muggy days September: 20 muggy days October: 10 muggy days November: 3 muggy days December: 1 muggy days JFMAMJJASOND

Muggy day: daily mean dew point of 65°F or higher, from hourly observations 1991-2020 at San Antonio International Airport, 8.3 mi N of the city center.

How much daylight?

Daylight ranges from about 10.3 hours in December to 14.0 hours in June.

January: 10.5 hours of daylight February: 11.2 hours of daylight March: 12.0 hours of daylight April: 12.9 hours of daylight May: 13.6 hours of daylight June: 14.0 hours of daylight 14.0 July: 13.8 hours of daylight August: 13.2 hours of daylight September: 12.3 hours of daylight October: 11.4 hours of daylight November: 10.7 hours of daylight December: 10.3 hours of daylight 10.3 JFMAMJJASOND
See all numbers
Monthly climate normals and day counts for San Antonio, 1991-2020
MonthHighLowPrecip.Wet daysSnowMuggy daysDaylight
January 63°F41°F 2.0 in7 0.0 in 0 10.5 h
February 68°F45°F 1.7 in7 0.1 in 1 11.2 h
March 74°F52°F 2.3 in9 0.0 in 2 12.0 h
April 80°F58°F 2.4 in6 0.0 in 7 12.9 h
May 87°F66°F 4.4 in8 0.0 in 19 13.6 h
June 92°F73°F 3.3 in7 0.0 in 27 14.0 h
July 95°F75°F 2.4 in5 0.0 in 30 13.8 h
August 96°F75°F 2.1 in5 0.0 in 28 13.2 h
September 90°F70°F 3.9 in7 0.0 in 20 12.3 h
October 82°F60°F 3.8 in6 0.0 in 10 11.4 h
November 72°F50°F 2.1 in6 0.0 in 3 10.7 h
December 65°F42°F 2.0 in8 0.1 in 1 10.3 h

High and low: NOAA 1991-2020 normal daily high and low. Wet days: at least 0.01 in of rain or melted snow. Muggy days: daily mean dew point 65°F or higher.

Best months to visit San Antonio

By our comfort score, the best months are February, March and November.

Comfort score by month (0-100) and its parts, in days per month
MonthScoreComfortableNotable rainHot or cold
Jan 621341
Feb 671431
Mar 671441
Apr 61843
May 472512
Jun 380524
Jul 360329
Aug 340329
Sep 371520
Oct 53646
Nov 661530
Dec 631430

Score = 40 × share of comfortable days + 25 × share of days without notable rain + 20 × share of days neither hot (90°F+) nor cold (high 40°F or below) + 15 × daylight. How the score works.

Frost dates in San Antonio

The last spring frost typically comes around Feb 26, and the first fall frost around Nov 28, leaving 277 frost-free days in a typical year.

Frost and freeze dates for San Antonio
Typical date1 year in 10
Last spring frost (32°F)Feb 26after Mar 17
First fall frost (32°F)Nov 28before Nov 7
Last hard freeze (28°F)Feb 9after Mar 7
First hard freeze (28°F)Dec 13before Nov 21
Frost-free season277 daysunder 247 days

"Typical" is the date with a 50% chance of a later spring frost (or earlier fall frost). Planting after the "1 year in 10" spring date gives a 90% chance of no further frost. The Old Farmer's Almanac publishes 30% dates, which fall between our typical and 1-in-10 dates.

Station: San Antonio Intl Airport (USW00012921), NOAA 1991-2020 freeze probabilities. Frost dates for every city in Texas.

Hottest and coldest readings, 1991-2020

The highest reading was 111°F (September 5, 2000); the lowest was 16°F (January 9, 2010).

From the temperature station's daily records with NOAA quality flags removed. Not an all-time record.

Near San Antonio

Similar climates elsewhere

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).

Distances from the city center (USGS). Methodology · Report an error