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
Entering September, Rochelle's average high-temperature reads a still moderately hot 73.4°F (23°C), indicating a close resemblance to the previous month's climate. Rochelle's temperature lowers to a mean of 54.5°F (12.5°C) during the nights in September.Humidity
In September, the average relative humidity in Rochelle is 79%.Rainfall
In Rochelle, Illinois, in September, it is raining for 10.1 days, with typically 1.14" (29mm) of accumulated precipitation. In Rochelle, during the entire year, the rain falls for 124.5 days and collects up to 14.49" (368mm) of precipitation.Snowfall
May through September are months without snowfall in Rochelle, Illinois.Daylight
The average length of the day in September in Rochelle, Illinois, is 12h and 28min.On the first day of September, sunrise is at 6:22 am and sunset at 7:29 pm. On the last day of the month, sunrise is at 6:52 am and sunset at 6:39 pm CDT.
Sunshine
The average sunshine in September is 8.6h.UV index
In Rochelle, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for the ordinary person.Note: A typical high UV index of 4 in September suggests the following recommendations:
Exercise caution. The susceptibility of light skin individuals to burns is less than 30 minutes. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures in Rochelle?
What is the average humidity in September in Rochelle?
How much does it rain in Rochelle in September?
When it does not snow in Rochelle?
Does it snow in Rochelle in September?
What is the average length of the day in September in Rochelle?
When are sunrise and sunset in September in Rochelle?
How many hours of sunshine does Rochelle have in September?
How high is the UV index in September in Rochelle?
Average temperature in September
Rochelle, IL
- Average high temperature in September: 73.4°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 (27°F).
- Average low temperature in September: 54.5°F
The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (14.7°F).
Average pressure in September
Rochelle, 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 (29.91"Hg).
Average wind speed in September
Rochelle, IL
- Average wind speed in September: 7.4mph
The windiest month (with the highest average wind speed) is April (10.3mph).
The calmest month (with the lowest average wind speed) is August (6.3mph).
Average humidity in September
Rochelle, IL
- Average humidity in September: 79%
The months with the highest relative humidity are January and July (85%).
The month with the lowest relative humidity is October (74%).
Average rainfall in September
Rochelle, IL
- Average rainfall in September: 1.14"
The wettest month (with the highest rainfall) is June (2.13").
The driest month (with the least rainfall) is February (0.55").
Average rainfall days in September
Rochelle, IL
- Average rainfall days in September: 10.1 days
The month with the highest number of rainy days is June (16 days).
The month with the least rainy days is February (3.8 days).
Average snowfall in September
Rochelle, IL
- Average snowfall in September: 0"
The month with the highest snowfall is January (2.2").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Rochelle, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (10.3 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
Rochelle, 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 June (Average sunshine: 9h and 30min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).
Average sunshine days in September
Rochelle, IL
- Average sunshine days in September: 18.5 days
The month with the most sunshine days is November (19.3 days).
The month with the least sunshine days is June (10.9 days).
Average UV index in September
Rochelle, 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 and December (UV index 1).
Average cloud cover in September
Rochelle, IL
- Average cloud cover in September: 34
The month with the most cloud cover is January (Cloud cover 63).
The month with the least cloud cover is September (Cloud cover 34).
Average visibility in September
Rochelle, IL
- Average visibility in September: 6mi
The months with the highest visibility are February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are January, July and August (5mi).
Rochelle, Illinois, USA
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