San Antonio Weather in September

September in San Antonio averages 33°C (91°F) during the day and 23°C (73°F) at night. It is the wettest month of the year, with 178 mm (7 in) of rainfall on average, so waterproof gear is a must.

Rainfall in San Antonio in September

With peak rainfall occurring this month, heavy downpours are common. It's advisable to have a poncho on hand to manage the rain. You can expect rain on around 16 days based on historical patterns, with 178 mm (7 in) average for the month. This month brings frequent, heavy showers. Both the number of wet days and the rainfall totals are on the high side.

Temperature in San Antonio in September

If you're visiting San Antonio in September, expect highs of 33°C (91°F) and overnight lows around 23°C (73°F). If you're spending a lot of time outdoors, it helps to plan around the warmer part of the day. Nights are mild at around 23°C (73°F), which is comfortable for most people.

Sunshine in San Antonio in September

The area enjoys a moderate level of sunlight, with around 175 hours. It's a good balance between sunny and cloudy days.

If you prefer dry days with pleasant temperatures, September may not be the ideal month to visit San Antonio. Our weather planner can help you explore destinations with more pleasant weather conditions.