September weather forecast
Mount Vernon, OH

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Weather in September

September, the first month of the autumn in Mount Vernon, is also an agreeable month, with an average temperature fluctuating between 54.5°F (12.5°C) and 73.2°F (22.9°C).

Temperature

With the onset of September, Mount Vernon experiences a modest temperature adjustment, with the average high-temperature gently receding from a moderately hot 78.8°F (26°C) in August to a pleasant 73.2°F (22.9°C). An average low-temperature of 54.5°F (12.5°C) is common during the nights of September.

Humidity

In September, the average relative humidity in Mount Vernon is 80%.

Rainfall

In Mount Vernon, Ohio, in September, during 12.1 rainfall days, 1.3" (33mm) of precipitation is typically accumulated. Throughout the year, in Mount Vernon, there are 148.8 rainfall days, and 18.9" (480mm) of precipitation is accumulated.

Snowfall

May through October are months without snowfall.

Daylight

In September, the average length of the day is 12h and 27min.
On the first day of the month, sunrise is at 6:58 am and sunset at 8:01 pm. On the last day of September, sunrise is at 7:26 am and sunset at 7:13 pm EDT.

Sunshine

In September, the average sunshine in Mount Vernon is 8h.

UV index

The average daily maximum UV index in September in Mount Vernon is 4. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV radiation for the average person.
Note: A maximum high daily UV index of 4 during September translates into the following directions:
Safety measures are advised. Light-skinned individuals may experience burns in under half an hour. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. Enhance your sun protection with tightly woven, yet airy clothing.
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Frequently asked questions

What are the temperatures in Mount Vernon in September?

September temperatures vary between a high-temperature of 73.2°F (22.9°C) and a low-temperature of 54.5°F (12.5°C).

What is the average humidity in September in Mount Vernon?

The average relative humidity in September is 80%.

How many days does it rain in September in Mount Vernon?

In September, the rain falls for 12.1 days. Throughout September, 1.3" (33mm) of precipitation is accumulated.

When it does not snow in Mount Vernon?

In Mount Vernon, Ohio, snow does not fall in May through October.

What is the average length of the day in September in Mount Vernon?

In Mount Vernon, the average day length in September is 12h and 27min.

When is the sunrise / sunset in September in Mount Vernon?

On the first day of September in Mount Vernon, Ohio, sunrise is at 6:58 am and sunset at 8:01 pm. On the last day of the month, sunrise is at 7:26 am and sunset at 7:13 pm EDT.

How many hours of sunshine does Mount Vernon have in September?

In Mount Vernon, the average sunshine duration in September is 8h.

What is the UV index reading in September in Mount Vernon?

In Mount Vernon, Ohio, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium hazard to health from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Mount Vernon, OH

Average temperature in September - Mount Vernon, OH
  • Average high temperature in September: 73.2°F

The warmest month (with the highest average high temperature) is July (79.9°F).
The month with the lowest average high temperature is January (31.5°F).

  • Average low temperature in September: 54.5°F

The month with the highest average low temperature is July (62.1°F).
The coldest month (with the lowest average low temperature) is January (19.2°F).

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Average pressure in September
Mount Vernon, OH

Average pressure in September - Mount Vernon, OH
  • Average pressure in September: 30.04"Hg

The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

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Average wind speed in September
Mount Vernon, OH

Average wind speed in September - Mount Vernon, OH
  • Average wind speed in September: 6.3mph

The windiest month (with the highest average wind speed) is January (10.1mph).
The calmest months (with the lowest average wind speed) are July and August (5.7mph).

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Average humidity in September
Mount Vernon, OH

Average humidity in September - Mount Vernon, OH
  • Average humidity in September: 80%

The month with the highest relative humidity is January (86%).
The months with the lowest relative humidity are March, April and November (78%).

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Average rainfall in September
Mount Vernon, OH

Average rainfall in September - Mount Vernon, OH
  • Average rainfall in September: 1.3"

The wettest month (with the highest rainfall) is May (2.36").
The driest month (with the least rainfall) is February (1.18").

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Average rainfall days in September
Mount Vernon, OH

Average rainfall days in September - Mount Vernon, OH
  • Average rainfall days in September: 12.1 days

The month with the highest number of rainy days is May (18.6 days).
The month with the least rainy days is February (6.9 days).

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Average snowfall in September
Mount Vernon, OH

Average snowfall in September - Mount Vernon, OH
  • Average snowfall in September: 0"

The month with the highest snowfall is February (1.65").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in September
Mount Vernon, OH

Average snowfall days in September - Mount Vernon, OH
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (10 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average daylight in September /
Average sunshine in September
Mount Vernon, OH

Average daylight in September / Average sunshine in September - Mount Vernon, OH
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).

  • Average sunshine in September: 8h and 0min

The month with the most sunshine is August (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 12min).

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Average sunshine days in September
Mount Vernon, OH

Average sunshine days in September - Mount Vernon, OH
  • Average sunshine days in September: 16.2 days

The month with the most sunshine days is November (19 days).
The month with the least sunshine days is May (10.5 days).

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Average UV index in September
Mount Vernon, OH

Average UV index in September - Mount Vernon, OH
  • Average UV index in September: 4

The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, October, November and December (UV index 2).

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Average cloud cover in September
Mount Vernon, OH

Average cloud cover in September - Mount Vernon, OH
  • Average cloud cover in September: 38

The month with the most cloud cover is January (Cloud cover 67).
The month with the least cloud cover is August (Cloud cover 32).

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Average visibility in September
Mount Vernon, OH

Average visibility in September - Mount Vernon, OH
  • Average visibility in September: 5mi

The months with the highest visibility are February, March, April, May, June, October, November and December (6mi).
The months with the lowest visibility are January, July, August and September (5mi).

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Mount Vernon, Ohio, USA

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