September weather forecast
Mount Carroll, IL

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Weather in September

The first month of the autumn, September, is still a pleasant month in Mount Carroll, Illinois, with an average temperature ranging between max 73°F (22.8°C) and min 54.5°F (12.5°C).

Temperature

The arrival of September correlates with a minor temperature reduction, down from August's warm 79.2°F (26.2°C) to a pleasant 73°F (22.8°C). Mount Carroll, during the month of September, experiences an average low-temperature of 54.5°F (12.5°C).

Humidity

The average relative humidity in September is 79%.

Rainfall

In Mount Carroll, Illinois, in September, during 9.7 rainfall days, 1.5" (38mm) of precipitation is typically accumulated. Throughout the year, there are 123.8 rainfall days, and 17.05" (433mm) of precipitation is accumulated.

Snowfall

In Mount Carroll, snow does not fall in May through September.

Daylight

The average length of the day in September is 12h and 28min.
On the first day of September, sunrise is at 6:26 am and sunset at 7:33 pm. On the last day of the month, sunrise is at 6:56 am and sunset at 6:42 pm CDT.

Sunshine

In September, the average sunshine is 8.9h.

UV index

In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for the ordinary person.
Note: A maximum daily UV index of 4 during September morphs into the following directions:
Guard yourself - An obligation to protect skin and eyes from harm exists. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. During bright days, sunglasses that offer UVA and UVB defense are recommended.
Updated: Aug 25, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the average September temperature?

During September, Mount Carroll experiences an average high-temperature of 73°F (22.8°C) and a low-temperature of 54.5°F (12.5°C).

What is the average humidity in September?

In September, the average relative humidity in Mount Carroll is 79%.

How many days does it rain in September?

In Mount Carroll, in September, it is raining for 9.7 days, with typically 1.5" (38mm) of accumulated precipitation.

When it does not snow?

In Mount Carroll, snow does not fall in May through September.

Does it snow in September?

In Mount Carroll, in September, it doesn't snow. In October, it regularly snows.

What is the average length of the day in September?

In September, the average day length is 12h and 28min.

When is the sunrise / sunset in September?

In September, on the first day of the month, sunrise is at 6:26 am and sunset at 7:33 pm. On the last day of the month, sunrise is at 6:56 am and sunset at 6:42 pm CDT.

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

In September, the average sunshine duration in Mount Carroll, Illinois, is 8.9h.

How high is the UV index in September?

The average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium hazard to health 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
Mount Carroll, IL

Average temperature in September - Mount Carroll, IL
  • Average high temperature in September: 73°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 (26.1°F).

  • Average low temperature in September: 54.5°F

The month with the highest average low temperature is July (63.3°F).
The coldest month (with the lowest average low temperature) is January (13.5°F).

Average pressure in September
Mount Carroll, IL

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

The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

Average wind speed in September
Mount Carroll, IL

Average wind speed in September - Mount Carroll, IL
  • Average wind speed in September: 7.6mph

The windiest month (with the highest average wind speed) is April (10.4mph).
The calmest month (with the lowest average wind speed) is August (6.5mph).

Average humidity in September
Mount Carroll, IL

Average humidity in September - Mount Carroll, IL
  • Average humidity in September: 79%

The month with the highest relative humidity is January (86%).
The month with the lowest relative humidity is October (74%).

Average rainfall in September
Mount Carroll, IL

Average rainfall in September - Mount Carroll, IL
  • Average rainfall in September: 1.5"

The wettest month (with the highest rainfall) is May (2.52").
The driest months (with the least rainfall) are January and February (0.67").

Average rainfall days in September
Mount Carroll, IL

Average rainfall days in September - Mount Carroll, IL
  • Average rainfall days in September: 9.7 days

The month with the highest number of rainy days is May (17.2 days).
The month with the least rainy days is February (3.9 days).

Average snowfall in September
Mount Carroll, IL

Average snowfall in September - Mount Carroll, IL
  • Average snowfall in September: 0"

The month with the highest snowfall is January (2.48").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in September
Mount Carroll, IL

Average snowfall days in September - Mount Carroll, IL
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (10.6 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

Average daylight in September /
Average sunshine in September
Mount Carroll, IL

Average daylight in September / Average sunshine in September - Mount Carroll, IL
  • Average daylight in September: 12h and 3min

The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).

  • Average sunshine in September: 8h and 5min

The month with the most sunshine is July (Average sunshine: 9h and 42min).
The months with the least sunshine are January and February (Average sunshine: 3h and 42min).

Average sunshine days in September
Mount Carroll, IL

Average sunshine days in September - Mount Carroll, IL
  • Average sunshine days in September: 18.9 days

The month with the most sunshine days is November (19.9 days).
The month with the least sunshine days is June (11.1 days).

Average UV index in September
Mount Carroll, IL

Average UV index in September - Mount Carroll, IL
  • Average UV index in September: 4

The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).

Average cloud cover in September
Mount Carroll, IL

Average cloud cover in September - Mount Carroll, IL
  • Average cloud cover in September: 32

The month with the most cloud cover is January (Cloud cover 62).
The month with the least cloud cover is September (Cloud cover 32).

Average visibility in September
Mount Carroll, IL

Average visibility in September - Mount Carroll, IL
  • Average visibility in September: 6mi

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

Mount Carroll, Illinois, USA

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