September Weather in Houston

Last updated: March 2, 2024

The weather in Houston, United States, during September is characterized by an average temperature of 25°C (77°F). Highs can soar to 35°C (94°F), while lows may dip to 13°C (56°F). Typically, the humidity level in Houston throughout September hovers around 74%.

13°C (56°F)

Minimum temperature

25°C (77°F)

Average temperature

35°C (94°F)

Maximum temperature

74%

Humidity

Precipitation and Sunshine hours

In September, Houston averages 92 mm (3.6 inches) of rainfall, typically over the course of 8 rainy days. The month enjoys an average of 12 hours 20 minutes of daylight, with the sun shining for approximately 9 hours 38 minutes each day. Additionally, there is a 52% probability of sunny days during this period.

92 mm (3.6 inches)

Precipitation

8 rainy days

Rainy days

9 hours 38 minutes

Sunshine hours

52%

Chance of sun

UV Index

In September, the UV Index in Houston reaches a maximum of 9, indicating a level of VeryHigh exposure. The most intense UV radiation typically occurs between 12:00 and 14:00, during which unprotected skin may burn in as little as 15 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 1 1 3 5 7 9 9 8 6 4 2 1 1
Exposure Low Moderate High VeryHigh High Moderate Low
Time to burn 45 min 30 min 25 min 15 min 25 min 30 min 45 min

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