September weather forecast
Alsey, IL

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Weather in September

The first month of the autumn, September, is still a warm month in Alsey, Illinois, with temperature in the range of an average high of 78.1°F (25.6°C) and an average low of 58.8°F (14.9°C).

Temperature

As August makes way for September, Alsey's average high-temperature eases from a warm 83.5°F (28.6°C) to a still moderately hot 78.1°F (25.6°C). In the month of September, the average temperature dips to a moderate 58.8°F (14.9°C) during the night.

Humidity

In September, the average relative humidity is 74%.

Rainfall

In September, the rain falls for 12.2 days. Throughout September, 2.64" (67mm) of precipitation is accumulated. Throughout the year, there are 155.4 rainfall days, and 31.69" (805mm) of precipitation is accumulated.

Snowfall

May through September are months without snowfall.

Daylight

In September, the average length of the day is 12h and 26min.
On the first day of September, sunrise is at 6:30 am and sunset at 7:32 pm. On the last day of the month, sunrise is at 6:57 am and sunset at 6:45 pm CDT.

Sunshine

In Alsey, the average sunshine in September is 9.4h.

UV index

The average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for the average person.
Note: A maximum high UV index of 5 in September translates into the following recommendations:
Take precautions - Protection against sunburn is recommended. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes.
Updated: Jul 19, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are the temperatures in September?

In September, the average high-temperature and low-temperature are 78.1°F (25.6°C) and 58.8°F (14.9°C) respectively. In August, the average heat index (a.k.a. 'feels like', 'real feel'), which represents the influence of relative humidity on air temperature, is calculated to be 91.4°F (33°C).

What is the average humidity in September?

In September, the average relative humidity is 74%.

How many days does it rain in September?

In Alsey, during September, the rain falls for 12.2 days and regularly aggregates up to 2.64" (67mm) of precipitation.

When it does not snow?

May through September are months without snowfall in Alsey.

Does it snow in September?

In Alsey, 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 in Alsey is 12h and 26min.

What time are sunrise and sunset in September?

On the first day of September, sunrise is at 6:30 am and sunset at 7:32 pm. On the last day of the month, sunrise is at 6:57 am and sunset at 6:45 pm CDT.

How many hours of sunshine does Alsey have in September?

In September, the average sunshine duration is 9.4h.

What is the UV index intensity in September?

The average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a medium health risk 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
Alsey, IL

Average temperature in September - Alsey, IL
  • Average high temperature in September: 78.1°F

The warmest month (with the highest average high temperature) is July (84°F).
The month with the lowest average high temperature is January (33.8°F).

  • Average low temperature in September: 58.8°F

The month with the highest average low temperature is July (66.7°F).
The coldest month (with the lowest average low temperature) is January (21.6°F).

Average pressure in September
Alsey, IL

Average pressure in September - Alsey, IL
  • Average pressure in September: 30.02"Hg

The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

Average wind speed in September
Alsey, IL

Average wind speed in September - Alsey, IL
  • Average wind speed in September: 6.8mph

The windiest months (with the highest average wind speed) are January and April (9.9mph).
The calmest month (with the lowest average wind speed) is July (6mph).

Average humidity in September
Alsey, IL

Average humidity in September - Alsey, IL
  • Average humidity in September: 74%

The month with the highest relative humidity is July (82%).
The month with the lowest relative humidity is October (71%).

Average rainfall in September
Alsey, IL

Average rainfall in September - Alsey, IL
  • Average rainfall in September: 2.64"

The wettest month (with the highest rainfall) is May (4.02").
The driest months (with the least rainfall) are January, February and December (1.73").

Average rainfall days in September
Alsey, IL

Average rainfall days in September - Alsey, IL
  • Average rainfall days in September: 12.2 days

The month with the highest number of rainy days is May (18.8 days).
The month with the least rainy days is February (7.2 days).

Average snowfall in September
Alsey, IL

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

The month with the highest snowfall is January (3.46").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in September
Alsey, IL

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

The month with the highest number of snowfall days is January (9.8 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
Alsey, IL

Average daylight in September / Average sunshine in September - Alsey, 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 2min

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 18min).

Average sunshine days in September
Alsey, IL

Average sunshine days in September - Alsey, IL
  • Average sunshine days in September: 15.4 days

The month with the most sunshine days is November (18.5 days).
The month with the least sunshine days is June (8.6 days).

Average UV index in September
Alsey, IL

Average UV index in September - Alsey, 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, February, November and December (UV index 2).

Average cloud cover in September
Alsey, IL

Average cloud cover in September - Alsey, IL
  • Average cloud cover in September: 30

The month with the most cloud cover is January (Cloud cover 52).
The months with the least cloud cover are June, July, August and September (Cloud cover 30).

Average visibility in September
Alsey, IL

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

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

Alsey, Illinois, USA

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