Rockford
Illinois, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Rockford, IL

The clear cityscape of the city of Rockford in Illinois, seen from above with a clear road network, river, a sunny and calm day with clear skies
The clear cityscape of the city of Rockford in Illinois, seen from above with a clear road network, river, a sunny and calm day with clear skies
September, the first month of the autumn, in Rockford, is still a warm month, with average temperature varying between 75.4°F (24.1°C) and 52.3°F (11.3°C).

Temperature

In Rockford, the average high-temperature marginally drops, from 82.4°F (28°C) in August, to a still moderately hot 75.4°F (24.1°C). In September, the average low-temperature is 52.3°F (11.3°C).

Rainfall

In September, in Rockford, the rain falls for 8.3 days. Throughout September, 3.4" (85.1mm) of precipitation is accumulated. In Rockford, during the entire year, the rain falls for 119.3 days and collects up to 36.2" (919.6mm) of precipitation.

Snowfall

Throughout the year, 36" (914.3mm) of snow is accumulated.

Daylight

In Rockford, Illinois, the average length of the day in September is 12.5h.

What is the temperature in September in Rockford?

The average high-temperature, in September, in Rockford, Illinois, is 75.4°F (24.1°C), while the average low-temperature is 52.3°F (11.3°C).

How much does it rain in Rockford in September?

In Rockford, in September, it is raining for 8.3 days, with typically 3.4" (85.1mm) of accumulated precipitation.

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

In September, the average length of the day in Rockford, Illinois, is 12.5h.
Average temperature in September - Rockford, IL
  • Average high temperature in September: 75.4°F

The warmest month (with the highest average high temperature) is July (84.5°F).
The month with the lowest average high temperature is January (29.5°F).

  • Average low temperature in September: 52.4°F

The month with the highest average low temperature is July (63°F).
The coldest month (with the lowest average low temperature) is January (13.5°F).

Average rainfall in September - Rockford, IL
  • Average rainfall in September: 3.4"

The wettest month (with the highest rainfall) is June (4.7").
Driest months (with the lowest rainfall) are January and February (1.4").

Average rainfall days in September - Rockford, IL
  • Average rainfall days in September: 8.3 days

The month with the highest number of rainy days is May (12.2 days).
Months with the lowest number of rainy days are February and September (8.3 days).

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

The month with the highest snowfall is January (10.6").
Months with the lowest snowfall are May, June, July, August, September and October (0").

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 (8.2 days).
Months with the lowest number of snowfall days are May, June, July, August and September (0 days).

Average daylight in September - Rockford, IL
  • Average daylight in September: 12.5h

The month with the longest days is June (Average daylight: 15.2h).
The month with shortest days is December (Average daylight: 9.1h).