San Antonio weather
Our guide to the weather in San Antonio during September
We've looked at the most up-to-date weather data for San Antonio, covering the last 12 years up to 2024, plus we've asked our team of travel bloggers for their first-hand experiences in order to answer the most frequently asked questions about San Antonio weather in September.
How warm is it in San Antonio during September?
The temperature reaches around 29℃ during the daytime in September, falling away to 16℃ at night. The UV index will be moderate at this time of year, so not something to worry about for the average person. However, if you're going to be outside for long periods it's worth wearing a broad spectrum SPF 30+ sunscreen and UV-blocking sunglasses. Remember that bright surfaces, such as water and sand increase UV exposure.
Does it rain in San Antonio during September?
On average, there will be 2 rainy days during the month, amounting to 27.9mm in total. That's much drier than we see in England during August, and therefore not something to be concerned about. There's a small chance that you'll catch a thunderstorm during your trip.
Is it windy in San Antonio during September?
You're unlikely to experience any strong winds. Expect a light breeze that picks up slightly at times in September. With moderate humidity, any breeze will have a welcome cooling effect.
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