September weather forecast
Lombard, IL

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Weather in September

By September, Lombard starts witnessing the first signs of the fall season; a decrease in temperatures and extended periods of daylight are the order of the day. Compared with August, September harbors less intensity in summer’s heat with temperatures dropping to 74.1°F (23.4°C). The noticeable drop in temperature signifies the shift out of summer and marks a cooler weather phase. Lombard residents anticipate the colorful fall foliage, a captivating sight that September's weather pattern makes possible. The transition to October signals a heightened appearance of autumn and a further fall in temperatures.

Temperature

September signifies a gentle decline in Lombard's average high-temperature, easing from 81.1°F (27.3°C) in August to a still moderately hot 74.1°F (23.4°C). In Lombard, an average low-temperature of 58.1°F (14.5°C) is recorded during September nights.

Humidity

The average relative humidity in September is 74%.

Rainfall

In Lombard, in September, it is raining for 13.2 days, with typically 1.61" (41mm) of accumulated precipitation. In Lombard, during the entire year, the rain falls for 147.3 days and collects up to 23.86" (606mm) of precipitation.

Snowfall

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

Daylight

The average length of the day in September in Lombard is 12h and 28min.
On the first day of the month, sunrise is at 6:18 am and sunset at 7:25 pm. On the last day of September, sunrise is at 6:48 am and sunset at 6:34 pm CDT.

Sunshine

The average sunshine in September is 8.7h.

UV index

The average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: A maximum high UV index of 4 in September translates into the following recommendations:
Undertake precautions - It is suggested to shield oneself from sunburn. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays.
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Frequently asked questions

What is the usual temperature for Lombard in September?

An average high-temperature, in September, in Lombard, is 74.1°F (23.4°C) and the average low-temperature is 58.1°F (14.5°C). In August, the average heat index (a.k.a. 'feels like', 'apparent temperature'), which combines relative humidity and air temperature, is appraised at 86°F (30°C).

What is the average humidity in September in Lombard?

In September, the average relative humidity in Lombard is 74%.

How much does it rain in Lombard in September?

In Lombard, Illinois, in September, during 13.2 rainfall days, 1.61" (41mm) of precipitation is typically accumulated.

When it does not snow in Lombard?

In Lombard, Illinois, snow does not fall in June through September.

Does it snow in Lombard in September?

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

What is the average length of the day in September in Lombard?

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

When is the sunrise / sunset in September in Lombard?

In September, on the first day of the month, sunrise is at 6:18 am and sunset at 7:25 pm. On the last day of the month, in Lombard, sunrise is at 6:48 am and sunset at 6:34 pm CDT.

How long on average sun shines in September in Lombard?

The average sunshine duration in September is 8.7h.

What is the UV index intensity in September in Lombard?

In Lombard, Illinois, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a moderate health threat 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
Lombard, IL

Average temperature in September - Lombard, IL
  • Average high temperature in September: 74.1°F

The warmest month (with the highest average high temperature) is July (82.2°F).
The month with the lowest average high temperature is January (28.6°F).

  • Average low temperature in September: 58.1°F

The month with the highest average low temperature is July (66.2°F).
The coldest month (with the lowest average low temperature) is January (17.1°F).

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Average pressure in September
Lombard, IL

Average pressure in September - Lombard, 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
Lombard, IL

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

The windiest month (with the highest average wind speed) is January (9.8mph).
The calmest month (with the lowest average wind speed) is August (6.1mph).

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Average humidity in September
Lombard, IL

Average humidity in September - Lombard, IL
  • Average humidity in September: 74%

The months with the highest relative humidity are January and February (82%).
The month with the lowest relative humidity is October (72%).

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Average rainfall in September
Lombard, IL

Average rainfall in September - Lombard, IL
  • Average rainfall in September: 1.61"

The wettest month (with the highest rainfall) is May (3.07").
The driest month (with the least rainfall) is December (1.14").

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Average rainfall days in September
Lombard, IL

Average rainfall days in September - Lombard, IL
  • Average rainfall days in September: 13.2 days

The month with the highest number of rainy days is July (17.7 days).
The month with the least rainy days is February (5.5 days).

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Average snowfall in September
Lombard, IL

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

The month with the highest snowfall is February (3.62").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Lombard, IL

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

The month with the highest number of snowfall days is January (12.4 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
Lombard, IL

Average daylight in September / Average sunshine in September - Lombard, 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 months with the most sunshine are July and August (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).

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Average sunshine days in September
Lombard, IL

Average sunshine days in September - Lombard, IL
  • Average sunshine days in September: 14.5 days

The month with the most sunshine days is November (17.4 days).
The month with the least sunshine days is July (10.2 days).

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Average UV index in September
Lombard, IL

Average UV index in September - Lombard, 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
Lombard, IL

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

The month with the most cloud cover is January (Cloud cover 61).
The months with the least cloud cover are July and August (Cloud cover 32).

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Average visibility in September
Lombard, IL

Average visibility in September - Lombard, 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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Lombard, Illinois, USA

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