September weather forecast
Walnut Hill, IL

Weather in September

The first month of the autumn, September, is still a warm month in Walnut Hill, Illinois, with an average temperature ranging between max 78.4°F (25.8°C) and min 59.9°F (15.5°C).

Temperature

In Walnut Hill, Illinois, the average high-temperature in September slightly decreases from a warm 83.8°F (28.8°C) in August to a still moderately hot 78.4°F (25.8°C). The average low-temperature, in Walnut Hill, Illinois, is 59.9°F (15.5°C).

Humidity

In September, the average relative humidity in Walnut Hill is 75%.

Rainfall

September is the month with the least rainfall. Rain falls for 6.3 days and accumulates 0.24" (6mm) of precipitation.

Snowfall

In Walnut Hill, snow does not fall in April through October.

Daylight

In September, the average length of the day in Walnut Hill is 12h and 25min.
On the first day of September, sunrise is at 6:25 am and sunset at 7:26 pm. On the last day of the month, sunrise is at 6:51 am and sunset at 6:40 pm CDT.

Sunshine

In September, the average sunshine is 9.1h.

UV index

The average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate health risk from unsafe exposure to UV radiation for the ordinary person.
Note: The average daily UV index of 5 in September transform into the following instructions:
Take precautions - Protection against sunburn is recommended. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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.
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FAQ

What is the temperature in September in Walnut Hill?

In September, in Walnut Hill, Illinois, the average high-temperature is 78.4°F (25.8°C), and the average low-temperature is 59.9°F (15.5°C). in August, the average heat index (a.k.a. 'apparent temperature', 'real feel'), which factors the actual air temperature with the relative humidity, is estimated at 93.2°F (34°C).

What is the average humidity in September in Walnut Hill?

The average relative humidity in September is 75%.

What is the driest month in Walnut Hill?

The month with the least rainfall in Walnut Hill is September, when the rain falls for 6.3 days and typically collects 0.24" (6mm) of precipitation.

How much does it rain in Walnut Hill in September?

In Walnut Hill, in September, during 6.3 rainfall days, 0.24" (6mm) of precipitation is typically accumulated.

When it does not snow in Walnut Hill?

In Walnut Hill, snow does not fall in April through October.

How many hours of daylight does Walnut Hill have in September?

The average day length in September in Walnut Hill is 12h and 25min.

What time are sunrise and sunset in September in Walnut Hill?

In September, on the first day of the month, sunrise is at 6:25 am and sunset at 7:26 pm. On the last day of the month, in Walnut Hill, sunrise is at 6:51 am and sunset at 6:40 pm CDT.

How long on average sun shines in September in Walnut Hill?

The average sunshine duration in September in Walnut Hill is 9.1h.

What is the UV index reading in September in Walnut Hill?

The average daily maximum UV index in September in Walnut Hill, Illinois, is 5. A UV Index reading of 3 to 5 represents a moderate vulnerability from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Walnut Hill, IL

Average temperature in September - Walnut Hill, IL
  • Average high temperature in September: 78.4°F

The warmest month (with the highest average high temperature) is July (84.9°F).
The month with the lowest average high temperature is January (37.2°F).

  • Average low temperature in September: 59.9°F

The month with the highest average low temperature is July (67.6°F).
The coldest month (with the lowest average low temperature) is January (24.3°F).

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Average pressure in September
Walnut Hill, IL

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

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

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Average wind speed in September
Walnut Hill, IL

Average wind speed in September - Walnut Hill, IL
  • Average wind speed in September: 6.5mph

The windiest month (with the highest average wind speed) is February (10mph).
The calmest month (with the lowest average wind speed) is July (5.8mph).

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Average humidity in September
Walnut Hill, IL

Average humidity in September - Walnut Hill, IL
  • Average humidity in September: 75%

The months with the highest relative humidity are May and July (80%).
The month with the lowest relative humidity is October (71%).

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Average rainfall in September
Walnut Hill, IL

Average rainfall in September - Walnut Hill, IL
  • Average rainfall in September: 0.24"

The wettest months (with the highest rainfall) are April and July (0.75").
The driest month (with the least rainfall) is September (0.24").

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Average rainfall days in September
Walnut Hill, IL

Average rainfall days in September - Walnut Hill, IL
  • Average rainfall days in September: 6.3 days

The month with the highest number of rainy days is May (10.1 days).
The month with the least rainy days is January (3.7 days).

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Average snowfall in September
Walnut Hill, IL

Average snowfall in September - Walnut Hill, IL
  • Average snowfall in September: 0"

The month with the highest snowfall is January (0.28").
The months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days in September
Walnut Hill, IL

Average snowfall days in September - Walnut Hill, IL
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (3.8 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight in September /
Average sunshine in September
Walnut Hill, IL

Average daylight in September / Average sunshine in September - Walnut Hill, IL
  • Average daylight in September: 12h and 25min

The month with the longest days is June (Average daylight: 14h and 49min).
The month with the shortest days is December (Average daylight: 9h and 32min).

  • Average sunshine in September: 9h and 6min

The months with the most sunshine are June and July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 24min).

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Average sunshine days in September
Walnut Hill, IL

Average sunshine days in September - Walnut Hill, IL
  • Average sunshine days in September: 21.4 days

The months with the most sunshine days are January and December (24.5 days).
The month with the least sunshine days is May (16.8 days).

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Average UV index in September
Walnut Hill, IL

Average UV index in September - Walnut Hill, 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, November and December (UV index 2).

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Average cloud cover in September
Walnut Hill, IL

Average cloud cover in September - Walnut Hill, IL
  • Average cloud cover in September: 30

The months with the most cloud cover are January and February (Cloud cover 51).
The month with the least cloud cover is June (Cloud cover 28).

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Average visibility in September
Walnut Hill, IL

Average visibility in September - Walnut Hill, 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).

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