Month guide · San Antonio · United States
San Antonio in September
What September is really like in San Antonio: weather, crowds, prices, events and what to pack.
Updated By the AMZBooking editorial team
Photo: Dave Stone, CC BY 2.0
Quick answer
September is a quieter month with trade-offs. Expect average highs of 32°C (90°F), lows of 21°C (70°F), about 7 rainy days and roughly 12.3 hours of daylight. Still hot, with tropical moisture bringing heavy showers at times.
Key facts
- Average high / low
- 32°C (90°F) / 21°C (70°F)
- Rainy days
- About 7
- Daylight
- About 12.3 hours
- Crowds
- Quiet
- Hotel prices
- Low
Weather in September
September is the 4th-warmest month in San Antonio: days average 32°C (90°F) against a yearly average high of 27°C (81°F), and nights fall to about 21°C (70°F). Rain falls on roughly 7 of its 30 days. Compared with August (36°C (97°F)), September is cooler; by October highs drop to around 28°C (82°F).
- Sunrise (15 September)
- About 07:18
- Sunset (15 September)
- About 19:39
- Daylight
- About 12.3 hours
Autumn (September–November). Heat fades through October, with Día de los Muertos and comfortable evenings on the river.
Crowds and prices
On a 1–5 scale, September rates 2 for crowds (the peak is April at 5) and 2 for hotel prices (highest in April). That makes September one of the better-value months to book.
Events in September
- Diez y Seis — Mexican Independence Day celebrations at Market Square (around 16 September)
Dates move from year to year. Check the organiser’s site before booking travel around an event.
What to do in September
Mild, settled days suit walking, viewpoints and time outdoors.
Garden · Brackenridge Park
Japanese Tea Garden
Visit in the morning when the light falls on the waterfall, then walk to the zoo next door.
- Time needed
- 45 minutes
- Cost
- Free
- Free
- Couples
- Photo spot
- Outdoors
Zoo · Brackenridge Park
San Antonio Zoo
A long-established zoo in Brackenridge Park with an African savanna area, big cats, hippos, a children's area and a large collection of birds and reptiles, set among limestone cliffs from the old quarries.
- Time needed
- 3 hours
- Cost
- Mid-priced
- Kids
- Outdoors
- Nature
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Theme park · Northwest
Six Flags Fiesta Texas
Go on a weekday outside school holidays and head to the biggest coasters first.
- Time needed
- Full day
- Cost
- Expensive
- Kids
- Active
- Outdoors
Theme park · Westover Hills
SeaWorld San Antonio
A marine theme park on the west side of the city with animal presentations, roller coasters and aquarium areas, plus the separate Aquatica water park next door.
- Time needed
- Full day
- Cost
- Expensive
- Kids
- Outdoors
What to pack
For highs near 32°C, lows near 21°C and 7 wet days: light, breathable clothes, a sun hat and high-factor sunscreen; a packable rain jacket for showers; comfortable walking shoes.
Is September a good time to visit San Antonio?
A quieter month with trade-offs, with a notable event on the calendar. If your dates are flexible, March–April and October–November are better overall. Compare every month.
San Antonio in other months
Questions travellers ask
+Is September a good time to visit San Antonio?
It is a quieter month with trade-offs. Still hot, with tropical moisture bringing heavy showers at times.
+How warm is San Antonio in September?
Average highs are around 32°C (90°F) and lows around 21°C (70°F).
+Does it rain a lot in San Antonio in September?
Expect rain on about 7 days of the month.