Monthly weather forecast and climate
San Antonio, TX

Buildings in San Antonio, Texas, with a calm view of the bridges across the waterfront
Buildings in San Antonio, Texas, with a calm view of the bridges across the waterfront
San Antonio has a humid subtropical type of climate (Köppen climate classification Cfa) with long, hot summers and warm to cool winters.
San Antonio, lies about 190 miles to the southwest of Austin, the capital of Texas, 190 miles west of Houston and 250 miles south of Dallas, in the southwestern United States.
San Antonio stands at an average altitude of 200 meters above sea level, and the topography is made of gently rolling hills, plains, and forests. The natural vegetation consists of cacti, mesquite, oak, and cedar woodlands and grasslands. Cold fronts from the north occasionally descend during the winters to affect the weather conditions.

Summers are hot, with an average high temperature of 96°F (35.6°C) at the peak of August. Eight days during the year cross 100°F (37.8°C), while 111 days are over 90°F (32.2°C). Winters range from mild to cool, with the average daily highs rarely dropping below 60°F (15.6°C). Nights range from 18°F (-7.8°C) on a few occasions to mostly over 40°F (4.4°C). The spring and autumn months tend to be warm and wet. The average humidity in San Antonio is 67%, and the majority of the year offers clear skies.

San Antonio is usually sunny, and the city records 2629 hours of sunshine annually. Average annual precipitation is 32" (812.8mm), and May, June, and October tend to be the rainiest months. Snowfall is rare in San Antonio, but the area experiences sleet and freezing rain on a few occasions. The ground thaws during the day, even if there is a rare snow deposit, once in a few years, because of a cold wave. Floods occur regularly, while tornadoes occasionally visit the region.

The highest temperature on record in San Antonio is 111°F (43.9°C), set on September 5, 2000, while the lowest recorded temperature is 0°F (-17.8°C), set on January 31, 1949.
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November to April is the best time to visit San Antonio, as the weather is relatively mild.
Temperatures drop by November in the late fall season, and the winter weather is pleasant in the absence of severe cold. Snowfall and snowstorms seldom occur in San Antonio, as its southern location is a long journey to travel for northern cold fronts. The occasional freezing nights during the winter rarely last for long periods, and the days mostly have temperatures above 60°F (15.6°C). The spring season is warm and wet, at least until April, and provides mild weather conditions.

May to October is usually the worst time to visit San Antonio, as the temperatures increase gradually, and the heat is at its peak in summer.
The subtropical climate is responsible for temperatures that remain above 90°F (32.2°C) during the summer. Additionally, heavy rain occurs in May, June, and October, which deters vacation plans to an extent. The harsh weather and summer crowds also result in a sharp rise in hotel prices.

San Antonio is prone to heavy rains and flash floods during late spring and summer, while tornadoes appear occasionally. The San Antonio area is one of the most flood-prone regions in the United States and regularly suffers from water damage. Heavy rain is common during May and June. Sometimes rainstorms deposit a significant amount of rain within a few days. San Antonio has experienced tornadoes in the F2 and F4 categories a few times over several decades.

January is the coldest month of the year in San Antonio with average temperatures in the 41°F (5°C) to 63°F (17.2°C) range. Weather in January »

February has pleasant weather in San Antonio as the average high temperature is warm 67°F (19.4°C) and very few days touch 80°F (26.7°C). Weather in February »

March brings warm spring weather to San Antonio as the average temperatures keep in the 51°F (10.6°C) to 74°F (23.3°C) range. Weather in March »

April is mid-spring in San Antonio with warm weather in the average range of 58°F (14.4°C) to 81°F (27.2°C). Weather in April »

May is the beginning of the hot season in San Antonio as the temperatures regularly cross 80°F (26.7°C). The average high temperature is 87°F (30.6°C) with at least ten days crossing 90°F (32.2°C). Weather in May »

San Antonio temperatures rarely drop below 60°F (15.6°C) in June as the highs touch 90°F (32.2°C) most of the time. Weather in June »

July has one of the hottest average temperature ranges of the year between 75°F (23.9°C) to 95°F (35°C). The daily highs rarely drop below 90°F (32.2°C), while a few days cross 100°F (37.8°C). Weather in July »

August is usually the hottest month in San Antonio with average temperatures in the 75°F (23.9°C) to 96°F (35.6°C). The heat does not subside even by the end of the month. Weather in August »

The first half of the month has daily highs of 90°F (32.2°C), while the latter half drops to 80°F (26.7°C). Weather in September »

October is a wet month during the fall season of San Antonio with warm temperatures in the average range of 60°F (15.6°C) to 82°F (27.8°C). Weather in October »

The daily highs are in the 60°F (15.6°C) to 70°F (21.1°C) range, while the nights are between 40°F (4.4°C) to 50°F (10°C). Weather in November »

December starts the mild winter season in San Antonio with the average temperatures in the 42°F (5.6°C) to 64°F (17.8°C) range. Weather in December »
Average rainfall - San Antonio, TX

The wettest month (with the highest rainfall) is May (3.7").
Driest months (with the lowest rainfall) are January, March, July and December (1.5").

Average rainfall days - San Antonio, TX
Average daylight / Average sunshine - San Antonio, TX
Average UV index - San Antonio, TX
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