San Antonio Weather in September
September in San Antonio brings pleasant temperatures, with daytime highs of 20°C (68°F) and nights around 11°C (52°F). It's part of the rainy season, with 243 mm (9.6 in) of rainfall on average, so an umbrella or poncho is a good idea.
Rainfall in San Antonio in September
As part of the rainy season, San Antonio sees around 10 days of rain in September, with an average of 243 mm (9.6 in). Rain during the rainy season here tends to be intense rather than just persistent drizzle. Expect significant downpours.
Temperature in San Antonio in September
September in San Antonio brings typical temperatures with highs around 20°C (68°F) and lows of 11°C (52°F). Even when the weather is stable, mornings and evenings can still feel distinctly cool. With lows of 11°C (52°F), nights are cool. If you're out after dark, an extra layer will keep you comfortable. The cooler air at night is also great for getting a good rest.
Sunshine in San Antonio in September
The area experiences a moderate amount of sunshine, with approximately 189 hours of sunlight expected. Even though this month is part of the rainy season, you could still see the sun every now and then.
Wind Speed in San Antonio in September
Wind speeds average () during September. This means conditions are typically very calm, with barely any noticeable air movement. While this is an average, some days may bring a light breeze, but many remain entirely still.Should you favor a climate that's both dry and comfortably warm, July and August typically offer the most agreeable circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Ecuador, check out our San Antonio's climate page.
San Antonio Temperature in September
Min Temperature
11°C (52°F)
Max Temperature
20°C (68°F)
Chance of Rain
33%
Precipitation
243 mm (9.6 in)
Rainy days
10 days
Humidity
72% *
Windspeed
() *
Sunshine
189 hours *
Percentage Sunshine
*
Daily Historical Temperatures
49-year average (1976-2025)
Based on our historical records, temperatures in San Antonio typically stay consistent throughout September, with daily highs averaging around 20°C (68°F). Nights are cool, with lows around 10°C (50°F).
Average temperatures in September
Historical weather for San Antonio in September
Browse day-by-day weather records for San Antonio spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
San Antonio historical weather extremes in September
The extremes listed below come from historical weather data collected in San Antonio from 2013 through 2025.
- The hottest September day on record in San Antonio reached 28°C (82°F) (September 4, 2024).
- The lowest daytime temperature in September was 15°C (59°F), recorded on September 6, 2021.
- San Antonio registered its coldest September night on September 17, 2023, with temperatures dropping to 4°C (39°F).
- Peak precipitation in September occurred on September 29, 2019, when 29 mm (1.1 in) of precipitation was measured.
Best Places in Ecuador in September
Find out more about the weather in Ecuador and which places have the best travel conditions in this month. See all of Ecuador in September →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in San Antonio in September
Pleasant temperatures in September mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Heavy rain is guaranteed, please bring a good poncho and waterproof everything! It won't hurt to bring your sunglasses along, as you'll see some sunny periods.What To Do in San Antonio in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Ecuador, check out our San Antonio's climate page.
Temperature Rainfall Sunshine Humidity Wind Speed
See the full San Antonio climate overview or explore weather in Ecuador.
