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 26°C (80°F). Highs can soar to 36°C (98°F), while lows may dip to 16°C (60°F). Typically, the humidity level in Mount Vernon throughout September hovers around 82%.

16°C (60°F)

Minimum temperature

26°C (80°F)

Average temperature

36°C (98°F)

Maximum temperature

82%

Humidity

Precipitation and Sunshine hours

In September, Mount Vernon averages 99 mm (3.9 inches) of rainfall, typically over the course of 11 rainy days. The month enjoys an average of 12 hours 19 minutes of daylight, with the sun shining for approximately 10 hours 0 minutes each day. Additionally, there is a 49% probability of sunny days during this period.

99 mm (3.9 inches)

Precipitation

11 rainy days

Rainy days

10 hours 0 minutes

Sunshine hours

49%

Chance of sun

UV Index

In September, the UV Index in Mount Vernon reaches a maximum of 10, indicating a level of VeryHigh exposure. The most intense UV radiation typically occurs between 13:00 and 15:00, 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	0	1	2	4	6	8	10	9	8	5	3	1	1
Exposure	Low			Moderate	High	VeryHigh				Moderate		Low
Time to burn	45 min			30 min	25 min	15 min				30 min		45 min