September weather forecast
Manteno, IL

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Weather in September

The first month of the autumn, September, is still a warm month in Manteno, Illinois, with an average temperature ranging between min 57.2°F (14°C) and max 74.8°F (23.8°C).

Temperature

Manteno observes a minor difference in average high-temperatures between August's 80.1°F (26.7°C) and September's 74.8°F (23.8°C). The average low-temperature during September nights is a moderate 57.2°F (14°C).

Humidity

In Manteno, the average relative humidity in September is 77%.

Rainfall

In Manteno, in September, during 9.5 rainfall days, 0.94" (24mm) of precipitation is typically accumulated. Throughout the year, in Manteno, there are 115.5 rainfall days, and 11.65" (296mm) of precipitation is accumulated.

Snowfall

May through September are months without snowfall.

Daylight

The average length of the day in September is 12h and 28min.
On the first day of September in Manteno, sunrise is at 6:18 am and sunset at 7:23 pm. On the last day of the month, sunrise is at 6:47 am and sunset at 6:34 pm CDT.

Sunshine

In September, the average sunshine is 8.6h.

UV index

In Manteno, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for the ordinary person.
Note: An average maximum UV index of 4 in September leads to these recommendations:
Exercise prevention - Warding off sunburn is urged. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. Stay sun-safe with clothing that is both closely woven and worn loosely.
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Frequently asked questions

What are the temperatures in Manteno in September?

During September, Manteno experiences an average high-temperature of 74.8°F (23.8°C) and a low-temperature of 57.2°F (14°C). In July, the average heat index (a.k.a. 'real feel', 'felt air temperature'), which combines air temperature and relative humidity, is appraised at 87.8°F (31°C).

What is the average humidity in September in Manteno?

In September, the average relative humidity in Manteno, Illinois, is 77%.

How much does it rain in Manteno in September?

In September, in Manteno, the rain falls for 9.5 days. Throughout September, 0.94" (24mm) of precipitation is accumulated.

When it does not snow in Manteno?

In Manteno, snow does not fall in May through September.

Does it snow in Manteno in September?

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

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

The average day length in September is 12h and 28min.

When is the sunrise / sunset in September in Manteno?

In September, on the first day of the month, sunrise is at 6:18 am and sunset at 7:23 pm. On the last day of the month, sunrise is at 6:47 am and sunset at 6:34 pm CDT.

How many hours of sunshine does Manteno have in September?

In Manteno, Illinois, the average sunshine duration in September is 8.6h.

How high is the UV index in September in Manteno?

The average daily maximum UV index in September in Manteno, Illinois, 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
Manteno, IL

Average temperature in September - Manteno, IL
  • Average high temperature in September: 74.8°F

The warmest month (with the highest average high temperature) is July (81.3°F).
The month with the lowest average high temperature is January (29.7°F).

  • Average low temperature in September: 57.2°F

The month with the highest average low temperature is July (64.8°F).
The coldest month (with the lowest average low temperature) is January (18.3°F).

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Average pressure in September
Manteno, IL

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

The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

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Average wind speed in September
Manteno, IL

Average wind speed in September - Manteno, IL
  • Average wind speed in September: 7mph

The windiest month (with the highest average wind speed) is January (9.9mph).
The calmest month (with the lowest average wind speed) is August (6mph).

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Average humidity in September
Manteno, IL

Average humidity in September - Manteno, IL
  • Average humidity in September: 77%

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

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Average rainfall in September
Manteno, IL

Average rainfall in September - Manteno, IL
  • Average rainfall in September: 0.94"

The wettest month (with the highest rainfall) is May (1.77").
The driest month (with the least rainfall) is February (0.55").

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Average rainfall days in September
Manteno, IL

Average rainfall days in September - Manteno, IL
  • Average rainfall days in September: 9.5 days

The month with the highest number of rainy days is May (14.2 days).
The month with the least rainy days is February (4.4 days).

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Average snowfall in September
Manteno, IL

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

The month with the highest snowfall is January (1.34").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in September
Manteno, IL

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

The month with the highest number of snowfall days is January (10.2 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
Manteno, IL

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

The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).

  • Average sunshine in September: 8h and 4min

The month with the most sunshine is 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
Manteno, IL

Average sunshine days in September - Manteno, IL
  • Average sunshine days in September: 17.5 days

The month with the most sunshine days is November (20.8 days).
The months with the least sunshine days are June and July (12.2 days).

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Average UV index in September
Manteno, IL

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

The months with the highest UV index are June and July (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
Manteno, IL

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

The month with the most cloud cover is January (Cloud cover 60).
The month with the least cloud cover is August (Cloud cover 32).

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Average visibility in September
Manteno, IL

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

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

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Manteno, Illinois, USA

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