September weather forecast
Schaumburg, IL

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Weather in September

September marks the arrival of fall, with the average high temperature dropping to 73.4°F (23°C). Rainfall dwindles down to about 1.69" (43mm), ushering in a drier, cooler atmosphere. This month is characterized by the onset of crispy autumn weather, with the landscape changing into a palette of oranges, yellows, and browns. The changing foliage adds a distinct charm to the town, making it an enchanting time to explore the outdoors. With the blend of the warm sun and the cool breeze, September presents a delightful reprieve from the summer heat.

Temperature

The onset of September is marked by a minor decrease in temperature, transitioning from 80.2°F (26.8°C) in August to a still moderately hot 73.4°F (23°C). Schaumburg's nights in September cool down to an average low-temperature of 57.6°F (14.2°C).

Humidity

In Schaumburg, Illinois, the average relative humidity in September is 75%.

Rainfall

In Schaumburg, Illinois, in September, it is raining for 12.8 days, with typically 1.69" (43mm) of accumulated precipitation. In Schaumburg, during the entire year, the rain falls for 147.4 days and collects up to 24.69" (627mm) of precipitation.

Snowfall

June through September are months without snowfall in Schaumburg.

Daylight

In September, the average length of the day in Schaumburg is 12h and 28min.
On the first day of September in Schaumburg, sunrise is at 6:18 am and sunset at 7:25 pm. On the last day of the month, sunrise is at 6:49 am and sunset at 6:35 pm CDT.

Sunshine

The average sunshine in September is 8.7h.

UV index

In Schaumburg, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for the average person.
Note: A maximum high daily UV index of 4 during September translates into the following directions:
Make use of precautions - Suggestions to resist sunburn are communicated. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection.
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Frequently asked questions

What are September temperatures in Schaumburg?

The high-temperature, in September, in Schaumburg, records 73.4°F (23°C), while the low-temperature is 57.6°F (14.2°C). In July, the average heat index (a.k.a. 'feels like', 'felt air temperature'), which combines air temperature and relative humidity, is estimated at 87.8°F (31°C).

What is the average humidity in September in Schaumburg?

In Schaumburg, Illinois, the average relative humidity in September is 75%.

How much does it rain in Schaumburg in September?

In Schaumburg, Illinois, in September, it is raining for 12.8 days, with typically 1.69" (43mm) of accumulated precipitation.

When it does not snow in Schaumburg?

In Schaumburg, snow does not fall in June through September.

Does it snow in Schaumburg in September?

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

How many hours of daylight does Schaumburg have in September?

In Schaumburg, Illinois, the average day length in September is 12h and 28min.

When is the sunrise / sunset in September in Schaumburg?

On the first day of September, sunrise is at 6:18 am and sunset at 7:25 pm. On the last day of the month, sunrise is at 6:49 am and sunset at 6:35 pm CDT.

How long on average sun shines in September in Schaumburg?

The average sunshine duration in September in Schaumburg is 8.7h.

What is the UV index reading in September in Schaumburg?

In Schaumburg, Illinois, the average daily maximum UV index in September is 4. A UV Index value 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 daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Schaumburg, IL

Average temperature in September - Schaumburg, IL
  • Average high temperature in September: 73.4°F

The warmest month (with the highest average high temperature) is July (81.9°F).
The month with the lowest average high temperature is January (27.9°F).

  • Average low temperature in September: 57.6°F

The month with the highest average low temperature is July (65.7°F).
The coldest month (with the lowest average low temperature) is January (16.5°F).

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Average pressure in September
Schaumburg, IL

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

The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

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Average wind speed in September
Schaumburg, IL

Average wind speed in September - Schaumburg, IL
  • Average wind speed in September: 7.2mph

The windiest month (with the highest average wind speed) is January (9.9mph).
The calmest month (with the lowest average wind speed) is August (6.2mph).

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Average humidity in September
Schaumburg, IL

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

The months with the highest relative humidity are January and February (83%).
The month with the lowest relative humidity is October (73%).

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Average rainfall in September
Schaumburg, IL

Average rainfall in September - Schaumburg, IL
  • Average rainfall in September: 1.69"

The wettest month (with the highest rainfall) is May (3.11").
The driest month (with the least rainfall) is December (1.14").

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Average rainfall days in September
Schaumburg, IL

Average rainfall days in September - Schaumburg, IL
  • Average rainfall days in September: 12.8 days

The month with the highest number of rainy days is July (17.8 days).
The month with the least rainy days is February (4.9 days).

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Average snowfall in September
Schaumburg, IL

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

The month with the highest snowfall is February (4.02").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Schaumburg, IL

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

The month with the highest number of snowfall days is January (13.1 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in September / Average sunshine in September - Schaumburg, IL
  • Average daylight in September: 12h and 3min

The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).

  • Average sunshine in September: 8h and 4min

The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).

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Average sunshine days in September
Schaumburg, IL

Average sunshine days in September - Schaumburg, IL
  • Average sunshine days in September: 14.4 days

The month with the most sunshine days is November (17.2 days).
The month with the least sunshine days is July (10.2 days).

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Average UV index in September
Schaumburg, IL

Average UV index in September - Schaumburg, IL
  • Average UV index in September: 4

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January and December (UV index 1).

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Average cloud cover in September
Schaumburg, IL

Average cloud cover in September - Schaumburg, IL
  • Average cloud cover in September: 33

The month with the most cloud cover is January (Cloud cover 62).
The months with the least cloud cover are July, August and September (Cloud cover 33).

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Average visibility in September
Schaumburg, IL

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

The months with the highest visibility are March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January and February (5mi).

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Schaumburg, Illinois, USA

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