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Climate in San Antonio (Texas)


Average weather, temperature, rainfall, sunshine hours

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San Antonio, where it's located


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Climate chart - San Antonio
The climate of San Antonio is subtropical, with mild winters and very hot, muggy summers.
The city is located in southern Texas, about 200 km (125 mi) away from the Gulf of Mexico.
The average temperature of the coldest month (January) is of 11.2 °C (52 °F), that of the warmest month (August) is of 29.7 °C (86 °F).
Precipitation amounts to 820 millimeters (32.3 inches) per year. The rainiest seasons are spring and autumn, due to the clash of air masses.

San Antonio

Winter, from December to February, is mild, but there may be variations in temperature. Even in the middle of winter, there can be hot days, with highs of 25 °C (77 °F) and more. In other circumstances, it can get cold at night, and the temperature can drop below freezing.
Occasionally, there may be real cold waves, which last a few days, during which the temperature can drop to -10 °C (14 °F) or below. The record is -18 °C (0 °F), set in January 1949. After 1980, the lowest values were -14.5 °C (6 °F) in December 1989 and -13 °C (8.5 °F) in February 2021.
Sometimes the dangerous phenomenon of freezing rain can occur.
Snow in San Antonio is rare. Normally you have to wait a few years between a snowfall with a slight accumulation and another. In December 2017, 5 centimeters (2 inches) of snow fell. In February 2021, snow reached 15 cm (6 in), as it had not happened for decades. The record belongs to January 1985 with 33 cm (13 in).

In the summer, from June to September, the combination of high temperature and humidity makes the heat very unpleasant. On the hottest days, it can reach and exceed 40 °C (104 °F). The record is 44 °C (111 °F), set in early September 2000.

From time to time, the city can be reached by the remnants of a hurricane, coming from the Gulf of Mexico or the Pacific. In general, hurricanes weaken when they penetrate inland, however, they can still bring abundant rains. The hurricane season runs from June to November, although they are more likely from August to October, with a peak in September.

San Antonio is just outside the "tornado alley", however tornadoes can occasionally occur in the period April-June (and more rarely in autumn).

Best Time


To visit San Antonio, you can choose spring and autumn (in particular, from mid-March to mid-April and from mid-October to mid-November), to avoid the summer heat. In winter, there are long mild periods, but some very cold days cannot be excluded.

San Antonio - Climate data


In San Antonio, the average temperature of the coldest month (January) is of 11.2 °C, that of the warmest month (August) is of 29.7 °C. Here are the average temperatures.
San Antonio - Average temperatures (1991-2020)
Temperatures (°C)
MonthMinMaxMean
January517.411.2
February7.319.713.5
March1123.217.1
April14.726.820.8
May19.130.324.7
June22.633.628.1
July23.734.929.3
August23.835.629.7
September20.932.326.6
October15.827.921.8
November9.922.116
December5.818.212
Year1526.920.9

Precipitation amounts to 820 millimeters per year: so, it is at an intermediate level. It ranges from 45 millimeters in the driest month (February) to 110 millimeters in the wettest one (May). Here is the average precipitation.
San Antonio - Average precipitation
MonthRain (mm)Days
January507
February457
March608
April606
May1108
June857
July605
August555
September1007
October956
November556
December507
Year82081

There are on average around 2630 sunshine hours per year. Here are the average hours of sunshine per day.
San Antonio - Sunshine hours
MonthAverageTotal
January5160
February6170
March7215
April7210
May7220
June9275
July10310
August9.5295
September8235
October7220
November5.5170
December5150
Year7.22630

San Antonio - Weather by month

Based on the period 1991-2020
(January - February - March - April - May - June - July - August - September - October - November - December)


January, the coldest month of the year, is generally a mild month. The average temperature is of 11.2 °C, with a minimum of 5 °C and a maximum of 17.4 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around -3 °C. However, it dropped to -8.9 °C in January 2010.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 27 °C. However, it reached 30 °C in January 2006.
Rain iconPrecipitation amounts to 50 mm, distributed over 7 days.
The day lasts on average 10 hours and 30 minutes.
Sun iconThere are on average 5 hours of sunshine per day. So, the sun shines 49% of the time.
The average humidity is 63%.
The average wind speed is of 12.1 kph.


February is generally a mild month. The average temperature is of 13.5 °C, with a minimum of 7.3 °C and a maximum of 19.7 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around -1.5 °C. However, it dropped to -8.3 °C in February 2002.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 29.5 °C. However, it reached 37.8 °C in February 1996.
Rain iconPrecipitation amounts to 45 mm, distributed over 7 days.
The day lasts on average 11 hours and 10 minutes.
Sun iconThere are on average 6 hours of sunshine per day. So, the sun shines 54% of the time.
The average humidity is 63%.
The average wind speed is of 12.9 kph.


March is generally a very mild month. The average temperature is of 17.1 °C, with a minimum of 11 °C and a maximum of 23.2 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 1 °C. However, it dropped to -7.2 °C in March 2002.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 31.5 °C. However, it reached 37.2 °C in March 1991.
Rain iconPrecipitation amounts to 60 mm, distributed over 8 days.
The day lasts on average 12 hours and 0 minutes.
Sun iconThere are on average 7 hours of sunshine per day. So, the sun shines 58% of the time.
The average humidity is 64%.
The average wind speed is of 14.4 kph.


April is generally a warm month. The average temperature is of 20.8 °C, with a minimum of 14.7 °C and a maximum of 26.8 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 5.5 °C. However, it dropped to 1.7 °C in April 1996.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 33.5 °C. However, it reached 38.3 °C in April 1996.
Rain iconPrecipitation amounts to 60 mm, distributed over 6 days.
The day lasts on average 12 hours and 55 minutes.
Sun iconThere are on average 7 hours of sunshine per day. So, the sun shines 54% of the time.
The average humidity is 64%.
The average wind speed is of 15.3 kph.


May is generally a warm to hot month. The average temperature is of 24.7 °C, with a minimum of 19.1 °C and a maximum of 30.3 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 11.5 °C. However, it dropped to 5.6 °C in May 2013.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 35.5 °C. However, it reached 40 °C in May 2004.
Rain iconPrecipitation amounts to 110 mm, distributed over 8 days.
The day lasts on average 13 hours and 40 minutes.
Sun iconThere are on average 7 hours of sunshine per day. So, the sun shines 52% of the time.
The average humidity is 68%.
The average wind speed is of 15.5 kph.


June is generally a very hot month. The average temperature is of 28.1 °C, with a minimum of 22.6 °C and a maximum of 33.6 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 18.5 °C. However, it dropped to 14.4 °C in June 1995.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 37.5 °C. However, it reached 42.2 °C in June 2013.
Rain iconPrecipitation amounts to 85 mm, distributed over 7 days.
The day lasts on average 14 hours and 0 minutes. June 21, the summer solstice, is the longest day of the year in the Northern Hemisphere.
Sun iconThere are on average 9 hours of sunshine per day. So, the sun shines 66% of the time.
The average humidity is 66%.
The average wind speed is of 15.2 kph.


July is generally a very hot month. The average temperature is of 29.3 °C, with a minimum of 23.7 °C and a maximum of 34.9 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 21 °C. However, it dropped to 17.8 °C in July 2019.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 38 °C. However, it reached 41.7 °C in July 2020.
Rain iconPrecipitation amounts to 60 mm, distributed over 5 days.
The day lasts on average 13 hours and 50 minutes.
Sun iconThere are on average 10 hours of sunshine per day. So, the sun shines 72% of the time.
The average humidity is 63%.
The average wind speed is of 14.5 kph.


August, the hottest month of the year, is generally a very hot month. The average temperature is of 29.7 °C, with a minimum of 23.8 °C and a maximum of 35.6 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 21 °C. However, it dropped to 16.1 °C in August 1992.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 39 °C. However, it reached 43.3 °C in August 2011.
Rain iconPrecipitation amounts to 55 mm, distributed over 5 days.
The day lasts on average 13 hours and 5 minutes.
Sun iconThere are on average 9.5 hours of sunshine per day. So, the sun shines 72% of the time.
The average humidity is 60%.
The average wind speed is of 13.2 kph.


September is generally a warm to hot month. The average temperature is of 26.6 °C, with a minimum of 20.9 °C and a maximum of 32.3 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 14 °C. However, it dropped to 8.9 °C in September 2000.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 37 °C. However, it reached 43.9 °C in September 2000.
Rain iconPrecipitation amounts to 100 mm, distributed over 7 days.
The day lasts on average 12 hours and 20 minutes.
Sun iconThere are on average 8 hours of sunshine per day. So, the sun shines 63% of the time.
The average humidity is 64%.
The average wind speed is of 11.6 kph.


October is generally a warm month. The average temperature is of 21.8 °C, with a minimum of 15.8 °C and a maximum of 27.9 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 5.5 °C. However, it dropped to -2.8 °C in October 1993.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 34 °C. However, it reached 37.2 °C in October 1991.
Rain iconPrecipitation amounts to 95 mm, distributed over 6 days.
The day lasts on average 11 hours and 25 minutes.
Sun iconThere are on average 7 hours of sunshine per day. So, the sun shines 62% of the time.
The average humidity is 65%.
The average wind speed is of 12.1 kph.


November is generally a very mild month. The average temperature is of 16 °C, with a minimum of 9.9 °C and a maximum of 22.1 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 0.5 °C. However, it dropped to -5 °C in November 1993.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 29.5 °C. However, it reached 32.8 °C in November 2017.
Rain iconPrecipitation amounts to 55 mm, distributed over 6 days.
The day lasts on average 10 hours and 40 minutes.
Sun iconThere are on average 5.5 hours of sunshine per day. So, the sun shines 54% of the time.
The average humidity is 66%.
The average wind speed is of 12 kph.


December is generally a mild month. The average temperature is of 12 °C, with a minimum of 5.8 °C and a maximum of 18.2 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around -2.5 °C. However, it dropped to -7.2 °C in December 1996.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 27 °C. However, it reached 30 °C in December 2007.
Rain iconPrecipitation amounts to 50 mm, distributed over 7 days.
The day lasts on average 10 hours and 20 minutes. December 21, the winter solstice, is the shortest day of the year in the Northern Hemisphere.
Sun iconThere are on average 5 hours of sunshine per day. So, the sun shines 47% of the time.
The average humidity is 64%.
The average wind speed is of 11.6 kph.

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