San Antonio Temperatures: Averages by Month

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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.

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