September weather forecast
Risk, IL

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Weather in September

The first month of the autumn, September, is still a warm month in Risk, Illinois, with temperature in the range of an average high of 75.7°F (24.3°C) and an average low of 57.2°F (14°C).

Temperature

The average high-temperature is a still warm 75.7°F (24.3°C) in September, hardly different from the 79.7°F (26.5°C) recorded in August. During the month of September, an average temperature of 57.2°F (14°C) is noted during the nights.

Humidity

The average relative humidity in September is 76%.

Rainfall

In Risk, in September, during 10.5 rainfall days, 1.18" (30mm) of precipitation is typically accumulated. In Risk, during the entire year, the rain falls for 130.5 days and collects up to 17.44" (443mm) of precipitation.

Snowfall

May through September are months without snowfall.

Daylight

In September, the average length of the day is 12h and 27min.
On the first day of September, sunrise is at 6:21 am and sunset at 7:25 pm. On the last day of the month, sunrise is at 6:49 am and sunset at 6:36 pm CDT.

Sunshine

In Risk, the average sunshine in September is 8.9h.

UV index

In September, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The UV index of 4 in September translates into these instructions:
Act with care - Obligation to protect against skin and eye damage is highlighted. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. To cut down UV radiation exposure by about half, sport a wide-brim hat.
Updated: Aug 19, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are the temperatures in Risk in September?

In September, the average high-temperature and low-temperature are 75.7°F (24.3°C) and 57.2°F (14°C) respectively. In July, the average heat index (a.k.a. 'feels like', 'apparent temperature'), which calculates the temperature value influenced by the moisture in the air, is computed to be 87.8°F (31°C).

What is the average humidity in September?

In September, the average relative humidity is 76%.

How many days does it rain in September?

In September, in Risk, the rain falls for 10.5 days. Throughout September, 1.18" (30mm) of precipitation is accumulated.

When it does not snow?

May through September are months without snowfall.

Does it snow in Risk in September?

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

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

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

When is the sunrise / sunset in September in Risk?

On the first day of September, sunrise is at 6:21 am and sunset at 7:25 pm. On the last day of the month, sunrise is at 6:49 am and sunset at 6:36 pm CDT.

How many hours of sunshine does Risk have in September?

In September, the average sunshine duration is 8.9h.

What is the UV index reading in September in Risk?

In September, the average daily maximum UV index in Risk, Illinois, is 4. A UV Index of 3 to 5 symbolizes a moderate health threat 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
Risk, IL

Average temperature in September - Risk, IL
  • Average high temperature in September: 75.7°F

The warmest month (with the highest average high temperature) is July (80.8°F).
The month with the lowest average high temperature is January (30.6°F).

  • Average low temperature in September: 57.2°F

The month with the highest average low temperature is July (64.6°F).
The coldest month (with the lowest average low temperature) is January (18.5°F).

Average pressure in September
Risk, IL

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

The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

Average wind speed in September
Risk, IL

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

The windiest month (with the highest average wind speed) is January (10.8mph).
The calmest month (with the lowest average wind speed) is August (6.4mph).

Average humidity in September
Risk, IL

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

The month with the highest relative humidity is July (86%).
The month with the lowest relative humidity is October (71%).

Average rainfall in September
Risk, IL

Average rainfall in September - Risk, IL
  • Average rainfall in September: 1.18"

The wettest month (with the highest rainfall) is May (2.56").
The driest month (with the least rainfall) is January (0.79").

Average rainfall days in September
Risk, IL

Average rainfall days in September - Risk, IL
  • Average rainfall days in September: 10.5 days

The month with the highest number of rainy days is May (17 days).
The months with the least rainy days are January and February (5 days).

Average snowfall in September
Risk, IL

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

The month with the highest snowfall is January (2.09").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in September
Risk, IL

Average snowfall days in September - Risk, 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
Risk, IL

Average daylight in September / Average sunshine in September - Risk, IL
  • 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 5min

The month with the most sunshine is June (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).

Average sunshine days in September
Risk, IL

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

The month with the most sunshine days is November (19.5 days).
The month with the least sunshine days is July (11.4 days).

Average UV index in September
Risk, IL

Average UV index in September - Risk, IL
  • Average UV index in September: 4

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

Average cloud cover in September
Risk, IL

Average cloud cover in September - Risk, IL
  • Average cloud cover in September: 32

The month with the most cloud cover is January (Cloud cover 59).
The month with the least cloud cover is September (Cloud cover 32).

Average visibility in September
Risk, IL

Average visibility in September - Risk, 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).

Risk, Illinois, USA

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