September weather forecast
Vernon, IL

Weather in September

September, the first month of the autumn in Vernon, is also a moderately hot month, with an average temperature fluctuating between 78.3°F (25.7°C) and 59.7°F (15.4°C).

Temperature

In Vernon, Illinois, the average high-temperature in September is almost the same as in August - a still warm 78.3°F (25.7°C). In Vernon, in September, the average low-temperature is 59.7°F (15.4°C).

Humidity

In September, the average relative humidity is 75%.

Rainfall

In September, in Vernon, the rain falls for 11.7 days. Throughout September, 1.69" (43mm) of precipitation is accumulated. Throughout the year, in Vernon, there are 145.5 rainfall days, and 28.39" (721mm) of precipitation is accumulated.

Snowfall

May through October are months without snowfall.

Daylight

In September, the average length of the day is 12h and 26min.
On the first day of September in Vernon, Illinois, sunrise is at 6:25 am and sunset at 7:26 pm. On the last day of the month, sunrise is at 6:51 am and sunset at 6:40 pm CDT.

Sunshine

In Vernon, Illinois, the average sunshine in September is 9.2h.

UV index

The average daily maximum UV index in September in Vernon is 5. A UV Index value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for the average person.
Note: In September, the average maximum UV index of 5 translate into the following recommendations:
Take precautions - Protection against sun damage is advised. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the temperature in September in Vernon?

The average high-temperature, in September, in Vernon, Illinois, is 78.3°F (25.7°C), while the average low-temperature is 59.7°F (15.4°C). The average heat index (a.k.a. 'feels like', 'felt air temperature'), which combines relative humidity and air temperature, in August is evaluated at 93.2°F (34°C).

What is the average humidity in September in Vernon?

In Vernon, the average relative humidity in September is 75%.

How many days does it rain in September in Vernon?

In Vernon, Illinois, during September, the rain falls for 11.7 days and regularly aggregates up to 1.69" (43mm) of precipitation.

When it does not snow in Vernon?

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

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

The average day length in September in Vernon is 12h and 26min.

What time are sunrise and sunset in September in Vernon?

In September, on the first day of the month, sunrise is at 6:25 am and sunset at 7:26 pm. On the last day of the month, in Vernon, Illinois, sunrise is at 6:51 am and sunset at 6:40 pm CDT.

How long on average sun shines in September in Vernon?

In Vernon, the average sunshine duration in September is 9.2h.

How high is the UV index in September in Vernon?

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

Average temperature in September
Vernon, IL

Average temperature in September - Vernon, IL
  • Average high temperature in September: 78.3°F

The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is January (37°F).

  • Average low temperature in September: 59.7°F

The month with the highest average low temperature is July (67.5°F).
The coldest month (with the lowest average low temperature) is January (24.3°F).

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Average pressure in September
Vernon, IL

Average pressure in September - Vernon, IL
  • Average pressure in September: 30.03"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

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Average wind speed in September
Vernon, IL

Average wind speed in September - Vernon, IL
  • Average wind speed in September: 6.5mph

The windiest months (with the highest average wind speed) are January and February (10mph).
The calmest month (with the lowest average wind speed) is July (5.8mph).

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Average humidity in September
Vernon, IL

Average humidity in September - Vernon, IL
  • Average humidity in September: 75%

The months with the highest relative humidity are May, July and August (80%).
The month with the lowest relative humidity is October (71%).

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Average rainfall in September
Vernon, IL

Average rainfall in September - Vernon, IL
  • Average rainfall in September: 1.69"

The wettest month (with the highest rainfall) is June (3.43").
The driest month (with the least rainfall) is February (1.46").

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Average rainfall days in September
Vernon, IL

Average rainfall days in September - Vernon, IL
  • Average rainfall days in September: 11.7 days

The month with the highest number of rainy days is May (16.7 days).
The month with the least rainy days is January (7.2 days).

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Average snowfall in September
Vernon, IL

Average snowfall in September - Vernon, IL
  • Average snowfall in September: 0"

The month with the highest snowfall is January (1.77").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in September
Vernon, IL

Average snowfall days in September - Vernon, IL
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (5.8 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight in September /
Average sunshine in September
Vernon, IL

Average daylight in September / Average sunshine in September - Vernon, IL
  • Average daylight in September: 12h and 26min

The month with the longest days is June (Average daylight: 14h and 50min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in September: 9h and 12min

The month with the most sunshine is June (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 30min).

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Average sunshine days in September
Vernon, IL

Average sunshine days in September - Vernon, IL
  • Average sunshine days in September: 15.7 days

The month with the most sunshine days is October (19.5 days).
The month with the least sunshine days is May (11.5 days).

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Average UV index in September
Vernon, IL

Average UV index in September - Vernon, IL
  • Average UV index in September: 5

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

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Average cloud cover in September
Vernon, IL

Average cloud cover in September - Vernon, IL
  • Average cloud cover in September: 29

The months with the most cloud cover are January and February (Cloud cover 51).
The months with the least cloud cover are June and August (Cloud cover 28).

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Average visibility in September
Vernon, IL

Average visibility in September - Vernon, IL
  • Average visibility in September: 6mi

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

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