September Weather in Mount Vernon

Last updated: March 2, 2024

The weather in Mount Vernon, United States, during September is characterized by an average temperature of 23°C (74°F). Highs can soar to 32°C (89°F), while lows may dip to 13°C (55°F). Typically, the humidity level in Mount Vernon throughout September hovers around 75%.

13°C (55°F)

Minimum temperature

23°C (74°F)

Average temperature

32°C (89°F)

Maximum temperature

75%

Humidity

Precipitation and Sunshine hours

In September, Mount Vernon averages 100 mm (3.9 inches) of rainfall, typically over the course of 10 rainy days. The month enjoys an average of 12 hours 22 minutes of daylight, with the sun shining for approximately 9 hours 48 minutes each day. Additionally, there is a 58% probability of sunny days during this period.

100 mm (3.9 inches)

Precipitation

10 rainy days

Rainy days

9 hours 48 minutes

Sunshine hours

58%

Chance of sun

UV Index

In September, the UV Index in Mount Vernon reaches a maximum of 8, 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 2 4 6 8 8 7 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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