September weather forecast
Bluffs, IL

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Weather in September

September, the first month of the autumn in Bluffs, is still a warm month, with an average temperature varying between 78.1°F (25.6°C) and 58.8°F (14.9°C).

Temperature

In September, the average high-temperature marginally decreases from a warm 83.5°F (28.6°C) in August to a still moderately hot 78.1°F (25.6°C). Throughout the nights in September, Bluffs experiences an average low-temperature of 58.8°F (14.9°C).

Humidity

In Bluffs, Illinois, the average relative humidity in September is 74%.

Rainfall

In Bluffs, in September, during 12.2 rainfall days, 2.64" (67mm) of precipitation is typically accumulated. In Bluffs, during the entire year, the rain falls for 155.4 days and collects up to 31.69" (805mm) of precipitation.

Snowfall

May through September are months without snowfall in Bluffs.

Daylight

In Bluffs, the average length of the day in September 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 6:58 am and sunset at 6:45 pm CDT.

Sunshine

The average sunshine in September is 9.4h.

UV index

In September, the average daily maximum UV index is 5. A UV Index value of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for ordinary individuals.
Note: The maximum UV index, 5 during September, leads to the following recommendations:
Take necessary precautions - Defending against sun damage is advocated. When the Sun is at its strongest around midday, find shade and limit exposure. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes.
Updated: Aug 21, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the average September temperature?

In Bluffs, 78.1°F (25.6°C) is the average high-temperature and 58.8°F (14.9°C) is the average low-temperature during September. The average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which factors the actual air temperature with the relative humidity, in August is computed to be 91.4°F (33°C).

What is the average humidity in September?

The average relative humidity in September is 74%.

How much does it rain in September?

In Bluffs, 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.

Does it snow in September?

In Bluffs, 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 26min.

When is the sunrise / sunset in September?

In September, on the first day of the month, sunrise is at 6:30 am and sunset at 7:32 pm. On the last day of the month, sunrise is at 6:58 am and sunset at 6:45 pm CDT.

How long on average sun shines in September?

In Bluffs, the average sunshine duration in September is 9.4h.

How high is the UV index in September in Bluffs?

In Bluffs, Illinois, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a medium hazard to health from 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
Bluffs, IL

Average temperature in September - Bluffs, 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
Bluffs, IL

Average pressure in September - Bluffs, 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
Bluffs, IL

Average wind speed in September - Bluffs, 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
Bluffs, IL

Average humidity in September - Bluffs, 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
Bluffs, IL

Average rainfall in September - Bluffs, 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
Bluffs, IL

Average rainfall days in September - Bluffs, 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
Bluffs, IL

Average snowfall in September - Bluffs, 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
Bluffs, IL

Average snowfall days in September - Bluffs, 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
Bluffs, IL

Average daylight in September / Average sunshine in September - Bluffs, 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
Bluffs, IL

Average sunshine days in September - Bluffs, 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
Bluffs, IL

Average UV index in September - Bluffs, 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
Bluffs, IL

Average cloud cover in September - Bluffs, 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
Bluffs, IL

Average visibility in September - Bluffs, 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).

Bluffs, Illinois, USA

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