September weather forecast
Vermilion, IL

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Weather in September

The first month of the autumn, September, is still a warm month in Vermilion, Illinois, with temperature in the range of an average high of 77.2°F (25.1°C) and an average low of 58.6°F (14.8°C).

Temperature

With the advent of September, Vermilion's high-temperatures adjust to a still warm 77.2°F (25.1°C), closely aligning with the preceding month. In Vermilion, September nights cool down to an average of 58.6°F (14.8°C).

Humidity

The average relative humidity in September is 76%.

Rainfall

In September, in Vermilion, the rain falls for 11 days. Throughout September, 1.1" (28mm) of precipitation is accumulated. In Vermilion, during the entire year, the rain falls for 133.4 days and collects up to 19.49" (495mm) of precipitation.

Snowfall

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

Daylight

In Vermilion, Illinois, the average length of the day in September is 12h and 26min.
On the first day of September in Vermilion, sunrise is at 6:19 am and sunset at 7:20 pm. On the last day of the month, sunrise is at 6:46 am and sunset at 6:33 pm CDT.

Sunshine

In Vermilion, the average sunshine in September is 9h.

UV index

The average daily maximum UV index in September in Vermilion is 5. A UV Index estimate of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for the average person.
Note: In September, the maximum UV index of 5 suggests this advice:
Guard yourself - An obligation to protect skin and eyes from harm exists. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. A hat with a broad brim is indispensable, filtering out up to half of UV rays.
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Frequently asked questions

What is the usual temperature for Vermilion in September?

During September, Vermilion experiences an average high-temperature of 77.2°F (25.1°C) and a low-temperature of 58.6°F (14.8°C). In August, the average heat index (a.k.a. 'real feel', 'felt air temperature'), which combines air temperature and relative humidity, is computed to be 87.8°F (31°C).

What is the average humidity in September in Vermilion?

The average relative humidity in September is 76%.

How much does it rain in Vermilion in September?

In Vermilion, Illinois, in September, it is raining for 11 days, with typically 1.1" (28mm) of accumulated precipitation.

When it does not snow in Vermilion?

In Vermilion, Illinois, snow does not fall in May through October.

How many hours of daylight does Vermilion have in September?

In Vermilion, the average day length in September is 12h and 26min.

What time are sunrise and sunset in September in Vermilion?

On the first day of September in Vermilion, Illinois, sunrise is at 6:19 am and sunset at 7:20 pm. On the last day of the month, sunrise is at 6:46 am and sunset at 6:33 pm CDT.

How long on average sun shines in September in Vermilion?

The average sunshine duration in September in Vermilion, Illinois, is 9h.

What is the UV index reading in September in Vermilion?

In September, the average daily maximum UV index in Vermilion is 5. A UV Index reading of 3 to 5 represents a moderate vulnerability from unsafe 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
Vermilion, IL

Average temperature in September - Vermilion, IL
  • Average high temperature in September: 77.2°F

The warmest month (with the highest average high temperature) is July (82.4°F).
The month with the lowest average high temperature is January (33.8°F).

  • Average low temperature in September: 58.6°F

The month with the highest average low temperature is July (65.8°F).
The coldest month (with the lowest average low temperature) is January (21.7°F).

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Average pressure in September
Vermilion, IL

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

The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

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Average wind speed in September
Vermilion, IL

Average wind speed in September - Vermilion, IL
  • Average wind speed in September: 6.9mph

The windiest months (with the highest average wind speed) are January and February (10.3mph).
The calmest months (with the lowest average wind speed) are July and August (6.1mph).

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Average humidity in September
Vermilion, IL

Average humidity in September - Vermilion, IL
  • Average humidity in September: 76%

The month with the highest relative humidity is July (83%).
The month with the lowest relative humidity is October (71%).

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Average rainfall in September
Vermilion, IL

Average rainfall in September - Vermilion, IL
  • Average rainfall in September: 1.1"

The wettest month (with the highest rainfall) is April (2.76").
The driest month (with the least rainfall) is February (0.94").

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Average rainfall days in September
Vermilion, IL

Average rainfall days in September - Vermilion, IL
  • Average rainfall days in September: 11 days

The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is February (6.3 days).

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Average snowfall in September
Vermilion, IL

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

The month with the highest snowfall is December (1.61").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in September
Vermilion, IL

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

The month with the highest number of snowfall days is January (6.9 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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

Average daylight in September / Average sunshine in September - Vermilion, IL
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).

  • Average sunshine in September: 9h and 0min

The month with the most sunshine is June (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).

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Average sunshine days in September
Vermilion, IL

Average sunshine days in September - Vermilion, IL
  • Average sunshine days in September: 17.2 days

The month with the most sunshine days is November (20 days).
The month with the least sunshine days is May (11.3 days).

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Average UV index in September
Vermilion, IL

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

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

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Average cloud cover in September
Vermilion, IL

Average cloud cover in September - Vermilion, IL
  • Average cloud cover in September: 31

The month with the most cloud cover is January (Cloud cover 56).
The months with the least cloud cover are June, August and September (Cloud cover 31).

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Average visibility in September
Vermilion, IL

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

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

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Vermilion, Illinois, USA

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