September weather forecast
Strawn, IL

Weather in September

September, the first month of the autumn in Strawn, is also a moderately hot month, with an average temperature fluctuating between 75.7°F (24.3°C) and 57.2°F (14°C).

Temperature

In September, the average high-temperature is almost the same as in August - a still moderately hot 75.7°F (24.3°C). The average low-temperature, in Strawn, Illinois, is 57.2°F (14°C).

Humidity

In September, the average relative humidity is 76%.

Rainfall

In Strawn, Illinois, during September, the rain falls for 10.5 days and regularly aggregates up to 1.18" (30mm) of precipitation. Throughout the year, in Strawn, there are 130.5 rainfall days, and 17.44" (443mm) of precipitation is accumulated.

Snowfall

May through September are months without snowfall in Strawn, Illinois.

Daylight

In September, the average length of the day is 12h and 27min.
On the first day of September in Strawn, sunrise is at 6:20 am and sunset at 7:26 pm. On the last day of the month, sunrise is at 6:49 am and sunset at 6:37 pm CDT.

Sunshine

In Strawn, Illinois, the average sunshine in September is 8.9h.

UV index

In September, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for the average person.
Note: In September, the average maximum UV index of 4 translate into the following recommendations:
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. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the temperature in September in Strawn?

The average high-temperature, in September, is 75.7°F (24.3°C), while the average low-temperature is 57.2°F (14°C). in July, the average heat index (a.k.a. 'felt air temperature', 'real feel'), which takes the relative humidity and factors it into the air temperature reading, is calculated to be 87.8°F (31°C).

What is the average humidity in September in Strawn?

In Strawn, Illinois, the average relative humidity in September is 76%.

How much does it rain in Strawn in September?

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

When it does not snow in Strawn?

May through September are months without snowfall in Strawn.

Does it snow in Strawn in September?

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

How many hours of daylight does Strawn have in September?

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

When is the sunrise / sunset in September in Strawn?

On the first day of September in Strawn, sunrise is at 6:20 am and sunset at 7:26 pm. On the last day of the month, sunrise is at 6:49 am and sunset at 6:37 pm CDT.

How long on average sun shines in September in Strawn?

In September, the average sunshine duration in Strawn, Illinois, is 8.9h.

What is the UV index reading in September in Strawn?

In September, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a medium health risk from unprotected exposure to UV radiation.
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
Strawn, IL

Average temperature in September - Strawn, 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).

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Average pressure in September
Strawn, IL

Average pressure in September - Strawn, 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).

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Average wind speed in September
Strawn, IL

Average wind speed in September - Strawn, 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).

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Average humidity in September
Strawn, IL

Average humidity in September - Strawn, 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%).

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Average rainfall in September
Strawn, IL

Average rainfall in September - Strawn, 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").

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Average rainfall days in September
Strawn, IL

Average rainfall days in September - Strawn, 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).

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Average snowfall in September
Strawn, IL

Average snowfall in September - Strawn, 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").

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Average snowfall days in September
Strawn, IL

Average snowfall days in September - Strawn, 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).

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Average daylight in September /
Average sunshine in September
Strawn, IL

Average daylight in September / Average sunshine in September - Strawn, IL
  • Average daylight in September: 12h and 27min

The month with the longest days is June (Average daylight: 15h and 2min).
The month with the shortest days is December (Average daylight: 9h and 19min).

  • Average sunshine in September: 8h and 54min

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).

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Average sunshine days in September
Strawn, IL

Average sunshine days in September - Strawn, 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).

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Average UV index in September
Strawn, IL

Average UV index in September - Strawn, 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).

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Average cloud cover in September
Strawn, IL

Average cloud cover in September - Strawn, 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).

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Average visibility in September
Strawn, IL

Average visibility in September - Strawn, 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).

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