Weather in San Antonio

Planning a trip or simply interested in the weather in San Antonio? Here you will find the latest information: current weather conditions, detailed forecasts, and useful charts to help you plan your day.

The climate in San Antonio can be described as subtropical, with distinct semi-arid characteristics. This means the city enjoys a large number of sunny days per year. Summers here are hot and long, while winters are generally short and mild.

In San Antonio, the seasons are clearly defined. The summer months, especially from June to August, are characterised by high temperatures, where the average maximum often exceeds 34°C. Winter, from December to February, is significantly milder, with average temperatures in the range of 12-14°C, and frosts occur infrequently. Spring and autumn represent comfortable transitional periods with warm and pleasant weather, ideally suited for outdoor activities and sightseeing.

One of the key features of the weather in San Antonio is the low level of precipitation throughout the year. Although the data mentions "wet days," particularly in May, the total amount of rainfall remains small, usually just a few millimetres per month. This makes San Antonio an attractive destination for those who prefer dry and sunny weather for their travels.

San Antonio observes a significant annual temperature variation, characteristic of its subtropical climate. The hottest months are traditionally July and August, when the average daily temperature steadily holds around 30°C, and maximum values can reach 35.5-36.2°C. The coolest month is considered to be January, with an average temperature of about 12.3°C, while minimum night-time temperatures drop on average to 6.7°C, and during the day the air can warm up to 17.8°C.

The summer period in San Antonio, covering the months from June to August, is distinguished by sustained heat. Average maximum temperatures during this time range from 34.3°C in June to 36.2°C in August. Nights also remain very warm, with minimum temperatures rarely falling below 23-24°C (for example, 23.4°C in June, 24.8°C in August). The difference between day and night temperatures in summer is approximately 10-11 degrees, indicating that heat is retained even after sunset, making the evenings warm.

Winter in San Antonio is, as a rule, mild and short. From December to February, average temperatures are in the range of 12-14°C (for example, 12.3°C in January, 14.2°C in December). During the day, the thermometer often rises to 17-19°C (for example, 17.8°C in January, 19.4°C in February), creating comfortable conditions for walking. At night, the temperature drops, on average, to 6-9°C (6.7°C in January, 9.0°C in December), however, severe frosts are not characteristic of the region. Daily temperature fluctuations in winter are also noticeable and amount to about 10-11 degrees, so it can be noticeably cooler in the evening and morning than during the day.

San Antonio is characterised by a relatively low level of precipitation throughout the year. Although rainy days occur monthly, the total amount of falling moisture remains small. Snow is uncharacteristic for San Antonio, given the mild winter temperatures; all precipitation falls predominantly in the form of rain.

The greatest amount of precipitation and rainy days usually falls in May. In this month, an average of about 4 mm of precipitation falls, and the number of days with rain reaches 14. This makes May the wettest period of the year, both in terms of volume and frequency of rain. April and September also stand out with slightly more precipitation (3 mm) compared to other months, with April counting about 10 rainy days, and September – 9.

Most other months, including winter and summer ones, receive only about 2 mm of precipitation. The "driest" months in terms of rain frequency are July and August, when only about 7 rainy days are registered in each. Given the small total amount of precipitation even on the "wettest" days, it can be assumed that rains in San Antonio most often bear the character of light or moderate showers, rather than heavy downpours.

When planning a trip to San Antonio, it is important to consider its subtropical climate with hot summers and mild winters. In the summer months, especially from June to August, when temperatures can rise to 34-36°C, be sure to pack light, breathable clothing made from natural fabrics such as cotton or linen. Do not forget sunscreen with high SPF, sunglasses, and a hat for protection against the intense Texas sun. Despite the total amount of precipitation being small, there are up to 14 "wet days" in May, so a compact umbrella or a light waterproof jacket may prove useful. Comfortable walking shoes are an absolute necessity for comfortable sightseeing.

For a visit to San Antonio during the cooler time of the year, from December to February, when the average temperature hovers around 12-14°C, and at night can drop to 6-9°C, the best strategy would be layering. Take long-sleeved t-shirts, sweaters or fleece tops, as well as a light jacket or windbreaker. This will allow you to easily adapt to temperature changes throughout the day, from a cooler morning to a warm afternoon. Spring and autumn delight with pleasant weather, but here too the principle of layering will help you feel comfortable, as evenings can be fresh.

In general, sunny weather with a small amount of precipitation is characteristic of San Antonio. Therefore, the main emphasis in your wardrobe should be on comfort and sun protection in summer, and on the ability to easily warm up or remove an extra layer of clothing in the cool seasons. Regardless of the time of year, do not forget comfortable shoes, because there is plenty to see in San Antonio!