San Antonio Temperatures: Averages by Month





The numbers here tell you how hot and cold the weather usually is in San Antonio, Texas during each month of the year.

The average high and low temperatures are listed below by month and annually for San Antonio, in both degrees Fahrenheit and Celsius.

Maximums and minimums are only part of the temperature picture. To fill in the rest, there's information on how many days a month get above or below a given temperature.

To find out how often it rises over 70, 80 or 90 °F each month in San Antonio, scroll down farther. There are also counts of nights with warm temperatures and days with cold weather.

All the numbers are averages, based on climate data gathered from 1981 to 2010.

Average San Antonio temperatures
High °F Low °F   High °C Low °C
63 41 January 17 5
67 44 February 19 7
74 51 March 23 10
81 58 April 27 15
87 67 May 31 19
92 73 June 34 23
95 75 July 35 24
96 75 August 36 24
90 69 September 32 21
82 60 October 28 16
72 50 November 22 10
64 42 December 18 5
80 59 Year 27 15

Days of Hot Weather in San Antonio

Normally every day from April to October in San Antonio is above 60 degrees Fahrenheit, as are most days in winter months. Summer temperatures top 79 degrees every day and remain above 69 degrees most nights.

San Antonio sees an average of eight days a year with 100-plus degree temperatures.

Days per month in San Antonio of at least 70, 80 or 90 °F
  70 °F
21 °C
80 °F
27 °C
90 °F
32 °C
January 9 1 0
February 12 3 0
March 22 8 0
April 28 17 2
May 31 27 10
June 30 30 22
July 31 31 27
August 31 31 28
September 30 28 18
October 29 21 4
November 19 6 0
December 10 1 0
Year 282 204 111
Average number of days monthly in San Antonio that stay above 50, 60 or 70 °F
  50 °F
10 °C
60 °F
16 °C
70 °F
21 °C
January 5 1 0
February 7 2 0
March 16 6 0
April 24 14 2
May 31 27 11
June 30 30 23
July 31 31 30
August 31 31 29
September 30 27 16
October 26 16 5
November 15 6 1
December 6 2 0
Year 252 193 116

How Often San Antonio Has Cold Temperatures

San Antonio averages 16 days a year of freezing weather, with one day a year dropping to 20 °F. Freezing temperatures normally occur from November to March.

But no matter how cold the night gets, the weather in San Antonio thaws during the day.

Reference

National Climatic Data Center. NOAA's 1981-2010 Climate Normals.

San Antonio Weather
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