September weather forecast
Macomb, IL

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Weather in September

September, the first month of the autumn in Macomb, is also a moderately hot month, with an average temperature varying between 57.6°F (14.2°C) and 76.8°F (24.9°C).

Temperature

The onset of September brings with it an average high-temperature of a still warm 76.8°F (24.9°C), showing a negligible variation from the month before. In the month of September, the nighttime temperature dips to a steady average of 57.6°F (14.2°C).

Humidity

In September, the average relative humidity is 76%.

Rainfall

In Macomb, Illinois, during September, the rain falls for 9.8 days and regularly aggregates up to 1.85" (47mm) of precipitation. Throughout the year, there are 122.7 rainfall days, and 17.8" (452mm) of precipitation is accumulated.

Snowfall

May through September are months without snowfall in Macomb.

Daylight

In Macomb, the average length of the day in September is 12h and 27min.
On the first day of the month, sunrise is at 6:30 am and sunset at 7:34 pm. On the last day of September, in Macomb, sunrise is at 6:58 am and sunset at 6:45 pm CDT.

Sunshine

The average sunshine in September is 9.4h.

UV index

The average daily maximum UV index in September in Macomb is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for the average person.
Note: In September, the maximum UV index of 4 transforms into these recommendations:
Prioritize safety - Suggestions to prevent sun damage are offered. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim.
Resources | Updated: Feb 12, 2024 | Published by: Weather U.S.

Frequently asked questions

What is the average September temperature in Macomb?

In Macomb, in September, the average high-temperature is 76.8°F (24.9°C), and the average low-temperature is 57.6°F (14.2°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 appraised at 87.8°F (31°C).

What is the average humidity in September in Macomb?

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

How much does it rain in Macomb in September?

In Macomb, Illinois, in September, it is raining for 9.8 days, with typically 1.85" (47mm) of accumulated precipitation.

When it does not snow in Macomb?

May through September are months without snowfall in Macomb.

Does it snow in Macomb in September?

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

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

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

When is the sunrise / sunset in September in Macomb?

In September, on the first day of the month, sunrise is at 6:30 am and sunset at 7:34 pm. On the last day of the month, sunrise is at 6:58 am and sunset at 6:45 pm CDT.

How long on average sun shines in September in Macomb?

In Macomb, Illinois, the average sunshine duration in September is 9.4h.

What is the UV index reading in September in Macomb?

The average daily maximum UV index in September in Macomb is 4. A UV Index estimate 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 daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Macomb, IL

Average temperature in September - Macomb, IL
  • Average high temperature in September: 76.8°F

The warmest month (with the highest average high temperature) is July (82.4°F).
The month with the lowest average high temperature is January (30.9°F).

  • Average low temperature in September: 57.6°F

The month with the highest average low temperature is July (65.8°F).
The coldest month (with the lowest average low temperature) is January (19°F).

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Average pressure in September
Macomb, IL

Average pressure in September - Macomb, IL
  • Average pressure in September: 30.02"Hg

The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

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Average wind speed in September
Macomb, IL

Average wind speed in September - Macomb, IL
  • Average wind speed in September: 7.5mph

The windiest month (with the highest average wind speed) is January (10.6mph).
The calmest months (with the lowest average wind speed) are July and August (6.6mph).

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Average humidity in September
Macomb, IL

Average humidity in September - Macomb, IL
  • Average humidity in September: 76%

The month with the highest relative humidity is July (83%).
The month with the lowest relative humidity is October (71%).

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Average rainfall in September
Macomb, IL

Average rainfall in September - Macomb, IL
  • Average rainfall in September: 1.85"

The wettest month (with the highest rainfall) is May (2.56").
The driest month (with the least rainfall) is January (0.67").

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Average rainfall days in September
Macomb, IL

Average rainfall days in September - Macomb, IL
  • Average rainfall days in September: 9.8 days

The month with the highest number of rainy days is May (16.2 days).
The month with the least rainy days is January (4.2 days).

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Average snowfall in September
Macomb, IL

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

The month with the highest snowfall is January (1.89").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in September
Macomb, IL

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

The month with the highest number of snowfall days is January (7.6 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
Macomb, IL

Average daylight in September / Average sunshine in September - Macomb, IL
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).

  • Average sunshine in September: 9h and 2min

The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).

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Average sunshine days in September
Macomb, IL

Average sunshine days in September - Macomb, IL
  • Average sunshine days in September: 18.3 days

The month with the most sunshine days is December (20.6 days).
The month with the least sunshine days is June (12.2 days).

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Average UV index in September
Macomb, IL

Average UV index in September - Macomb, 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, February, November and December (UV index 2).

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Average cloud cover in September
Macomb, IL

Average cloud cover in September - Macomb, IL
  • Average cloud cover in September: 30

The month with the most cloud cover is January (Cloud cover 56).
The months with the least cloud cover are August and September (Cloud cover 30).

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Average visibility in September
Macomb, IL

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

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