September weather forecast
Rockford, IL

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The clear cityscape of the city of Rockford in Illinois
The clear cityscape of the city of Rockford in Illinois

Weather in September

September ushers in the arrival of fall to Rockford, bringing about a gradual decrease in temperatures and daylight hours. While the average high remains at a pleasant 72.7°F (22.6°C), the cooler evenings offer an early indication of the approaching fall. The change in seasons is also reflected in the color transformation seen in the city's natural scenes. Despite the shortening days, clear visibility remains consistent at an average of 6 miles throughout the month. September in Rockford offers a remarkable blend of lingering summer warmth and the crisp entrée of autumn.

Temperature

September's onset in Rockford introduces a mild reduction in the average high-temperature, from a moderately hot 78.1°F (25.6°C) in August to a pleasant 72.7°F (22.6°C). An average low-temperature of 54.1°F (12.3°C) is recorded during the nights in September in Rockford, Illinois.

Humidity

In September, the average relative humidity in Rockford is 80%.

Rainfall

In September, the rain falls for 11.8 days. Throughout September, 2.13" (54mm) of precipitation is accumulated. In Rockford, during the entire year, the rain falls for 148.1 days and collects up to 28.39" (721mm) of precipitation.

Snowfall

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

Daylight

In September, the average length of the day in Rockford is 12h and 28min.
On the first day of September in Rockford, sunrise is at 6:22 am and sunset at 7:29 pm. On the last day of the month, sunrise is at 6:53 am and sunset at 6:39 pm CDT.

Sunshine

In September, the average sunshine in Rockford is 8.7h.

UV index

In September, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for average individuals.
Note: In September, the maximum UV index of 4 suggests these recommendations:
Undertake protective steps - Preventing sun damage is advised. Considering the harmful UV rays from the Sun during midday, it's essential to reduce exposure. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage.
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Frequently asked questions

What are September temperatures in Rockford?

In September, the average high-temperature and low-temperature in Rockford, Illinois, are 72.7°F (22.6°C) and 54.1°F (12.3°C) respectively.

What is the average humidity in September in Rockford?

In September, the average relative humidity in Rockford is 80%.

How much does it rain in Rockford in September?

In Rockford, in September, it is raining for 11.8 days, with typically 2.13" (54mm) of accumulated precipitation.

When it does not snow in Rockford?

In Rockford, Illinois, snow does not fall in May through September.

Does it snow in Rockford in September?

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

How many hours of daylight does Rockford have in September?

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

What time are sunrise and sunset in September in Rockford?

On the first day of September in Rockford, Illinois, sunrise is at 6:22 am and sunset at 7:29 pm. On the last day of the month, sunrise is at 6:53 am and sunset at 6:39 pm CDT.

How long on average sun shines in September in Rockford?

In September, the average sunshine duration in Rockford is 8.7h.

How high is the UV index in September in Rockford?

In Rockford, Illinois, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents 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
Rockford, IL

Average temperature in September - Rockford, IL
  • Average high temperature in September: 72.7°F

The warmest month (with the highest average high temperature) is July (79.9°F).
The month with the lowest average high temperature is January (26.2°F).

  • Average low temperature in September: 54.1°F

The month with the highest average low temperature is July (63°F).
The coldest month (with the lowest average low temperature) is January (13.8°F).

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Average pressure in September
Rockford, IL

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

The months with the highest atmospheric pressure are January and February (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

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Average wind speed in September
Rockford, IL

Average wind speed in September - Rockford, IL
  • Average wind speed in September: 7.3mph

The windiest month (with the highest average wind speed) is April (10.1mph).
The calmest month (with the lowest average wind speed) is August (6.3mph).

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Average humidity in September
Rockford, IL

Average humidity in September - Rockford, IL
  • Average humidity in September: 80%

The month with the highest relative humidity is January (86%).
The months with the lowest relative humidity are April and October (75%).

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Average rainfall in September
Rockford, IL

Average rainfall in September - Rockford, IL
  • Average rainfall in September: 2.13"

The wettest month (with the highest rainfall) is June (4.02").
The driest month (with the least rainfall) is February (1.26").

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Average rainfall days in September
Rockford, IL

Average rainfall days in September - Rockford, IL
  • Average rainfall days in September: 11.8 days

The month with the highest number of rainy days is May (19 days).
The month with the least rainy days is February (4.3 days).

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Average snowfall in September
Rockford, IL

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

The month with the highest snowfall is January (4.88").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in September
Rockford, IL

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

The month with the highest number of snowfall days is January (13 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
Rockford, IL

Average daylight in September / Average sunshine in September - Rockford, 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: 9h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).

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Average sunshine days in September
Rockford, IL

Average sunshine days in September - Rockford, IL
  • Average sunshine days in September: 15.7 days

The month with the most sunshine days is November (17.1 days).
The month with the least sunshine days is June (9.8 days).

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Average UV index in September
Rockford, IL

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

The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January, November and December (UV index 1).

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Average cloud cover in September
Rockford, IL

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

The month with the most cloud cover is January (Cloud cover 63).
The month with the least cloud cover is September (Cloud cover 33).

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Average visibility in September
Rockford, IL

Average visibility in September - Rockford, IL
  • Average visibility in September: 5mi

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

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Rockford, Illinois, USA

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