Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
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.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures in Rockford?
What is the average humidity in September in Rockford?
How much does it rain in Rockford in September?
When it does not snow in Rockford?
Does it snow in Rockford in September?
How many hours of daylight does Rockford have in September?
What time are sunrise and sunset in September in Rockford?
How long on average sun shines in September in Rockford?
How high is the UV index in September in Rockford?
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).
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).
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).
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%).
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").
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).
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").
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).
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).
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).
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).
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).
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).
Rockford, Illinois, USA
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