September Weather in San Antonio

Last updated: March 2, 2024

The weather in San Antonio, Mexico, during September is characterized by an average temperature of 27°C (81°F). Highs can soar to 38°C (100°F), while lows may dip to 19°C (66°F). Typically, the humidity level in San Antonio throughout September hovers around 72%.

19°C (66°F)

Minimum temperature

27°C (81°F)

Average temperature

38°C (100°F)

Maximum temperature

72%

Humidity

Precipitation and Sunshine hours

In September, San Antonio averages 110 mm (4.3 inches) of rainfall, typically over the course of 11 rainy days. The month enjoys an average of 12 hours 15 minutes of daylight, with the sun shining for approximately 9 hours 25 minutes each day. Additionally, there is a 56% probability of sunny days during this period.

110 mm (4.3 inches)

Precipitation

11 rainy days

Rainy days

9 hours 25 minutes

Sunshine hours

56%

Chance of sun

UV Index

In September, the UV Index in San Antonio reaches a maximum of 11, indicating a level of Extreme exposure. The most intense UV radiation typically occurs between 13:00 and 15:00, during which unprotected skin may burn in as little as 10 minutes.

Average solar exposure data for the current time of the year. Actual values may vary and depend on many factors, such as cloud cover, vegetation cover, surface type, etc.
  07:00 08:00 09:00 10:00 11:00 12:00 13:00 14:00 15:00 16:00 17:00 18:00 19:00
UVI 0 1 2 4 7 10 11 11 9 7 4 2 1
Exposure Low Moderate High VeryHigh Extreme VeryHigh High Moderate Low
Time to burn 45 min 30 min 25 min 15 min 10 min 15 min 25 min 30 min 45 min

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