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 80, 90 or 100 °F each month in San Antonio, scroll down farther. There are also counts of nights with warm temperatures and days with cold weather.
The first set of high and low temperatures are averages for 2010 to 2019. Everything else here is based on 1991 to 2020 weather.
| High °F | Low °F | High °C | Low °C | |
|---|---|---|---|---|
| 64 | 41 | January | 18 | 5 |
| 68 | 46 | February | 20 | 8 |
| 75 | 53 | March | 24 | 12 |
| 81 | 60 | April | 27 | 15 |
| 87 | 67 | May | 31 | 20 |
| 93 | 74 | June | 34 | 23 |
| 96 | 76 | July | 36 | 24 |
| 98 | 77 | August | 37 | 25 |
| 92 | 72 | September | 33 | 22 |
| 83 | 61 | October | 28 | 16 |
| 72 | 51 | November | 22 | 11 |
| 65 | 44 | December | 19 | 7 |
| 81 | 60 | Year | 27 | 16 |
| High °F | Low °F | High °C | Low °C | |
|---|---|---|---|---|
| 63 | 41 | January | 17 | 5 |
| 68 | 45 | February | 20 | 7 |
| 74 | 52 | March | 23 | 11 |
| 80 | 58 | April | 27 | 15 |
| 87 | 66 | May | 30 | 19 |
| 92 | 73 | June | 34 | 23 |
| 95 | 75 | July | 35 | 24 |
| 96 | 75 | August | 36 | 24 |
| 90 | 70 | September | 32 | 21 |
| 82 | 60 | October | 28 | 16 |
| 72 | 50 | November | 22 | 10 |
| 65 | 42 | December | 18 | 6 |
| 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 daily and remain above 69 degrees most nights.
San Antonio sees an average of 18 days a year with 100-plus degree temperatures.
| 80 °F 27 °C |
90 °F 32 °C |
100 °F 38 °C |
|
|---|---|---|---|
| January | 1 | 0 | 0 |
| February | 4 | 0 | 0 |
| March | 10 | 1 | 0 |
| April | 19 | 3 | 0 |
| May | 28 | 12 | 0 |
| June | 30 | 24 | 2 |
| July | 31 | 29 | 6 |
| August | 31 | 29 | 9 |
| September | 28 | 20 | 1 |
| October | 23 | 6 | 0 |
| November | 7 | 0 | 0 |
| December | 2 | 0 | 0 |
| Year | 213 | 122 | 18 |
| 50 °F 10 °C |
60 °F 16 °C |
70 °F 21 °C | |
|---|---|---|---|
| January | 5 | 1 | 0 |
| February | 9 | 3 | 0 |
| March | 18 | 8 | 0 |
| April | 24 | 14 | 2 |
| May | 31 | 26 | 11 |
| June | 30 | 30 | 23 |
| July | 31 | 31 | 30 |
| August | 31 | 31 | 29 |
| September | 30 | 27 | 17 |
| October | 26 | 17 | 5 |
| November | 14 | 6 | 1 |
| December | 7 | 2 | 0 |
| Year | 255 | 195 | 118 |
How Often San Antonio Has Cold Temperatures
San Antonio averages 14 days a year of freezing weather, with one day every few years dropping to 20 °F (-8 °C) or lower. Freezing temperatures normally occur from November to March.
Most freezing nights are followed by a daytime thaw. Twice a decade, on average, the thermometer never rises above freezing for the enitre day.
References
Jay Lawrimore, Ron Ray, Scott Applequist, Bryant Korzeniewski, Matthew Menne. 2016. Global Summary of the Month and Year, Version 1.0. NOAA National Centers for Environmental Information.
NOAA National Centers for Environmental Information (NCEI). Climate Normals.