The month in detail
What to expect in September
Autumn marks the end of peak season in San Antonio. Temperatures drop (91°F) and rain returns (21% of days). Rain risk remains low (21% of days), leaving good room for outdoor activities.
September ranks 9 out of 12 months in San Antonio. Compared to August: −5°F daytime, −1.7h of sun per day.
This month's conditions
What it's like in September
UV index
7 · high
sunscreen and hat advised
Feels like
muggy at times
19°
Daylight
12.2h of daylight
Air quality
good
AQI 31
Compare
Is September the right month?
The best month in San Antonio is October (8.6/10), 3.3 pts higher than September.
Book
Plan your trip
Hotels at their lowest outside peak season, highest on comfortable months. Shoulder seasons offer a good price/climate compromise.
Stay
Hotels & rentals · San Antonio
Expedia →
Activities
Tours, tickets, experiences
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Flights
Multi-airline comparator
Kiwi →
🎟️ Activities & tours · San Antonio
GetYourGuide selection · free cancellation
Practical info
What you need to know before you go
Three angles: the country (language, currency, safety, budget), the year-round climate, and the specifics of a city break.
Country · United States
🗣️LanguageEnglish
💶CurrencyUS Dollar ($)
🚗DrivingRight-hand
🛡️Safety ⓘVery safe · 1/5
💰Cost of living ⓘExpensive · 4/5
🌡️ Climate
🌍Climate typeTemperate
📈Climate trend ⓘ+2.42°F/decade
🔥Hottest monthJuly · 97°F
❄️Coolest monthJanuary · 64°F
🌧️Rainiest month ⓘMay · 30%
🏛️ City break
📅Tourist peak seasonJune → August
☔Indoor sights ⓘYear-round
🚇Public transportGood
Explore
Other destinations in September
If September doesn't convince you for this destination, compare with others.
Location
Where is San Antonio ?
Global position + regional geographic context.
🌍 World
🔍 Geographic context
United StatesTemperate climate with a 8.6 → 4.8 gap between best and worst month. 10 years of ERA5 data to choose by project.
29.42°N · 98.49°W
Questions
Frequently asked questions
What is the best time to visit San Antonio?
April is the best month with 82°F highs, 63°F lows, 7.0h of sunshine and 23.0% rainy days. The months of April & October offer comparable conditions.
How many hours of sunshine does San Antonio get in April?
San Antonio averages 7.0 sunshine hours per day in April. It is the sunniest month with a climate score of 8.1/10.
What is the rainiest month in San Antonio?
August is the most unfavourable month with August has the lowest climate score of the year and the lowest climate score of the year.
What are the temperatures at night in San Antonio in April?
In April, overnight lows reach 63°F, while afternoon highs average 82°F.
Is San Antonio good in winter?
In winter (December-February), San Antonio scores 7.2/10 on average — Acceptable conditions for cultural visits.. The best month overall remains April with a score of 8.1/10.
When should you avoid San Antonio?
August is the most difficult month to visit San Antonio, with August has the lowest climate score of the year. Climate conditions are at their lowest of the year during this period.
Do you need sun protection in San Antonio in September?
The average UV index reaches 7 in September in San Antonio (high), with about 12.2h of daylight. Sunscreen and hat advised.