San Antonio Weather in September

San Antonio in September sees moderate daytime temperatures of 16°C (61°F) and nighttime lows of 9°C (48°F). Moderate rainfall is typical, with around 31 mm (1.2 in) for the month.

Rainfall in San Antonio in September

Climate statistics over the past 30 years suggest around 3 days of rain, with 31 mm (1.2 in) average for the month. Although rain is not especially frequent, individual showers can still be quite heavy.

Temperature in San Antonio in September

Expect highs of 16°C (61°F) in San Antonio in September, with nights dropping to around 9°C (48°F). Even when the weather is stable, mornings and evenings can still feel distinctly cool. With overnight lows of 9°C (48°F), nights are cold. The cold air does make for deep, comfortable sleep if you have enough blankets.

Sunshine in San Antonio in September

The area experiences a moderate amount of sunshine, with approximately 147 hours of sunlight expected. This means a decent mix of sun and overcast.

If you prefer enjoying temperate temperatures and rain-free days, January, February, March, April, October, November and December typically offer the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.