September weather forecast
Huntsville, IL

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Weather in September

The first month of the autumn, September, is still a warm month in Huntsville, Illinois, with an average temperature fluctuating between 58.1°F (14.5°C) and 77.7°F (25.4°C).

Temperature

The start of September marks an average high-temperature of a still moderately hot 77.7°F (25.4°C), hardly distinguishable from the conditions in August. During the nights in September, an average low-temperature of 58.1°F (14.5°C) is observed.

Humidity

The average relative humidity in September is 75%.

Rainfall

In Huntsville, Illinois, in September, it is raining for 10.2 days, with typically 2.2" (56mm) of accumulated precipitation. In Huntsville, during the entire year, the rain falls for 132 days and collects up to 22.17" (563mm) of precipitation.

Snowfall

In Huntsville, snow does not fall in May through October.

Daylight

The average length of the day in September is 12h and 26min.
On the first day of the month, sunrise is at 6:31 am and sunset at 7:34 pm. On the last day of September, sunrise is at 6:59 am and sunset at 6:46 pm CDT.

Sunshine

The average sunshine in September is 9.4h.

UV index

In Huntsville, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a medium health hazard from unsafe exposure to UV radiation for the ordinary person.
Note: A daily high UV index of 5 in September leads to these guidelines:
Guard yourself - Avoiding sunburn is suggested. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
Updated: Jul 11, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are September temperatures?

The average high-temperature, in September, in Huntsville, is 77.7°F (25.4°C), while the average low-temperature is 58.1°F (14.5°C). In August, the average heat index (a.k.a. 'felt air temperature', 'real feel'), which combines air temperature and relative humidity, is estimated at 91.4°F (33°C).

What is the average humidity in September in Huntsville?

In September, the average relative humidity is 75%.

How much does it rain in September?

In Huntsville, Illinois, in September, during 10.2 rainfall days, 2.2" (56mm) of precipitation is typically accumulated.

When it does not snow?

May through October are months without snowfall.

What is the average length of the day in September?

In September, the average day length is 12h and 26min.

When are sunrise and sunset in September?

In September, on the first day of the month, sunrise is at 6:31 am and sunset at 7:34 pm. On the last day of the month, sunrise is at 6:59 am and sunset at 6:46 pm CDT.

How long on average sun shines in September?

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

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 medium health risk 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
Huntsville, IL

Average temperature in September - Huntsville, IL
  • Average high temperature in September: 77.7°F

The warmest month (with the highest average high temperature) is July (83.7°F).
The month with the lowest average high temperature is January (32.7°F).

  • Average low temperature in September: 58.1°F

The month with the highest average low temperature is July (66.6°F).
The coldest month (with the lowest average low temperature) is January (20.3°F).

Average pressure in September
Huntsville, IL

Average pressure in September - Huntsville, 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
Huntsville, IL

Average wind speed in September - Huntsville, IL
  • Average wind speed in September: 7.1mph

The windiest month (with the highest average wind speed) is January (10.2mph).
The calmest month (with the lowest average wind speed) is July (6.3mph).

Average humidity in September
Huntsville, IL

Average humidity in September - Huntsville, IL
  • Average humidity in September: 75%

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

Average rainfall in September
Huntsville, IL

Average rainfall in September - Huntsville, IL
  • Average rainfall in September: 2.2"

The wettest month (with the highest rainfall) is May (3.23").
The driest month (with the least rainfall) is January (0.98").

Average rainfall days in September
Huntsville, IL

Average rainfall days in September - Huntsville, IL
  • Average rainfall days in September: 10.2 days

The month with the highest number of rainy days is May (16.9 days).
The months with the least rainy days are January and February (5.3 days).

Average snowfall in September
Huntsville, IL

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

The month with the highest snowfall is January (3.19").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in September
Huntsville, IL

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

The month with the highest number of snowfall days is January (7.8 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
Huntsville, IL

Average daylight in September / Average sunshine in September - Huntsville, 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 24min).

  • Average sunshine in September: 9h and 2min

The months with the most sunshine are June and July (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 4h and 18min).

Average sunshine days in September
Huntsville, IL

Average sunshine days in September - Huntsville, IL
  • Average sunshine days in September: 18.2 days

The month with the most sunshine days is January (20 days).
The month with the least sunshine days is May (11.4 days).

Average UV index in September
Huntsville, IL

Average UV index in September - Huntsville, 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
Huntsville, IL

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

The month with the most cloud cover is January (Cloud cover 54).
The months with the least cloud cover are July, August and September (Cloud cover 30).

Average visibility in September
Huntsville, IL

Average visibility in September - Huntsville, 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).

Huntsville, Illinois, USA

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