September weather forecast
Jonesboro, IL

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Weather in September

September, the first month of the autumn in Jonesboro, is still a warm month, with an average temperature ranging between max 81°F (27.2°C) and min 60.6°F (15.9°C).

Temperature

Jonesboro in September experiences a gentle temperature dip, with average high-temperatures reducing from a hot 86.5°F (30.3°C) in August to a moderately hot 81°F (27.2°C). Jonesboro, in September, observes a steady average low-temperature of 60.6°F (15.9°C).

Heat index

September's heat index is evaluated at 84.2°F (29°C). Constant activity during exposure could result in a state of weariness and possibly heat cramps.
Heat index's context suggests values are appropriate for shady areas and slight breezes. Facing direct sunlight may hike up the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', stands as a testimony to how temperature and humidity combine to impact our sense of warmth. The individual's experience of temperature can be shaped by numerous aspects such as metabolic variations, physical exertion, and attire. With direct sunlight, be aware that it might enhance the heat sensation, raising the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are primarily vital for children. Kids frequently fail to realize the necessity for resting and hydrating. Thirst is an advanced indication of dehydration - hence, maintaining hydration, especially during extended physical activities, becomes essential.

Humidity

The average relative humidity in September is 73%.

Rainfall

September is the month with the least rainfall. Rain falls for 10.8 days and accumulates 1.3" (33mm) of precipitation.

Snowfall

May through September are months without snowfall.

Daylight

In Jonesboro, the average length of the day in September is 12h and 25min.
On the first day of the month, sunrise is at 6:28 am and sunset at 7:25 pm. On the last day of September, sunrise is at 6:52 am and sunset at 6:41 pm CDT.

Sunshine

In September, the average sunshine is 9.5h.

UV index

In Jonesboro, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for the ordinary person.
Note: The maximum daily UV index of 5 during September translates into the following directions:
Heed the precautions - Protecting the skin and eyes from damage is compulsory. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days.
Updated: Jun 29, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the usual temperature for Jonesboro in September?

In September, the average high-temperature and low-temperature are 81°F (27.2°C) and 60.6°F (15.9°C) respectively. In September, the average heat index (a.k.a. 'real feel', 'feels like'), which calculates the temperature value influenced by the moisture in the air, is evaluated at 84.2°F (29°C).

What is the average humidity in September?

In Jonesboro, Illinois, the average relative humidity in September is 73%.

What is the driest month?

The month with the least rainfall is September, when the rain falls for 10.8 days and typically collects 1.3" (33mm) of precipitation.

How much does it rain in September?

In Jonesboro, in September, during 10.8 rainfall days, 1.3" (33mm) of precipitation is typically accumulated.

When it does not snow?

May through September are months without snowfall.

Does it snow in September?

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

What is the average length of the day in September?

In Jonesboro, the average day length in September is 12h and 25min.

When are sunrise and sunset in September?

On the first day of September, sunrise is at 6:28 am and sunset at 7:25 pm. On the last day of the month, sunrise is at 6:52 am and sunset at 6:41 pm CDT.

How long on average sun shines in September?

The average sunshine duration in September is 9.5h.

How high is the UV index in September?

The average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes 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
Jonesboro, IL

Average temperature in September - Jonesboro, IL
  • Average high temperature in September: 81°F

The warmest month (with the highest average high temperature) is July (88.3°F).
The month with the lowest average high temperature is January (39.7°F).

  • Average low temperature in September: 60.6°F

The month with the highest average low temperature is July (69.1°F).
The coldest month (with the lowest average low temperature) is January (26.8°F).

Average pressure in September
Jonesboro, IL

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

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

Average wind speed in September
Jonesboro, IL

Average wind speed in September - Jonesboro, IL
  • Average wind speed in September: 6.2mph

The windiest month (with the highest average wind speed) is January (9mph).
The calmest month (with the lowest average wind speed) is August (5.6mph).

Average humidity in September
Jonesboro, IL

Average humidity in September - Jonesboro, IL
  • Average humidity in September: 73%

The month with the highest relative humidity is May (79%).
The month with the lowest relative humidity is October (71%).

Average rainfall in September
Jonesboro, IL

Average rainfall in September - Jonesboro, IL
  • Average rainfall in September: 1.3"

The wettest month (with the highest rainfall) is April (3.31").
The driest month (with the least rainfall) is September (1.3").

Average rainfall days in September
Jonesboro, IL

Average rainfall days in September - Jonesboro, IL
  • Average rainfall days in September: 10.8 days

The month with the highest number of rainy days is July (15.9 days).
The month with the least rainy days is January (8.4 days).

Average snowfall in September
Jonesboro, IL

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

The month with the highest snowfall is February (1.89").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in September
Jonesboro, IL

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

The month with the highest number of snowfall days is January (4.6 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
Jonesboro, IL

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

The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).

  • Average sunshine in September: 9h and 3min

The month with the most sunshine is July (Average sunshine: 10h and 24min).
The months with the least sunshine are January and February (Average sunshine: 4h and 36min).

Average sunshine days in September
Jonesboro, IL

Average sunshine days in September - Jonesboro, IL
  • Average sunshine days in September: 17.5 days

The month with the most sunshine days is October (21 days).
The month with the least sunshine days is July (12.8 days).

Average UV index in September
Jonesboro, IL

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

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

Average cloud cover in September
Jonesboro, IL

Average cloud cover in September - Jonesboro, IL
  • Average cloud cover in September: 28

The month with the most cloud cover is February (Cloud cover 51).
The month with the least cloud cover is September (Cloud cover 28).

Average visibility in September
Jonesboro, IL

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

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

Jonesboro, Illinois, USA

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