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
The commencement of September includes a gentle temperature shift, with the average high-temperature dropping a bit from a warm 78.1°F (25.6°C) in August to a pleasant 72.3°F (22.4°C). September nights observe an average temperature dip to a cool 54.1°F (12.3°C).Humidity
The average relative humidity in September in Belvidere is 80%.Rainfall
In Belvidere, in September, it is raining for 12.6 days, with typically 2.17" (55mm) of accumulated precipitation. Throughout the year, there are 154 rainfall days, and 30.47" (774mm) of precipitation is accumulated.Snowfall
In Belvidere, Illinois, snow does not fall in May through September.Daylight
In September, the average length of the day in Belvidere is 12h and 28min.On the first day of September in Belvidere, sunrise is at 6:21 am and sunset at 7:28 pm. On the last day of the month, sunrise is at 6:52 am and sunset at 6:38 pm CDT.
Sunshine
In Belvidere, the average sunshine in September is 8.6h.UV index
In September, the average daily maximum UV index in Belvidere is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for ordinary individuals.Note: In September, a daily maximum UV index of 4 leads to the following instructions:
Be vigilant - Suggestions to stave off sun damage are provided. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage.
Frequently asked questions
What is the usual temperature for Belvidere in September?
What is the average humidity in September in Belvidere?
How many days does it rain in September in Belvidere?
When it does not snow in Belvidere?
Does it snow in Belvidere in September?
What is the average length of the day in September in Belvidere?
When are sunrise and sunset in September in Belvidere?
How many hours of sunshine does Belvidere have in September?
How high is the UV index in September in Belvidere?
Average temperature in September
Belvidere, IL
- Average high temperature in September: 72.3°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 (25.9°F).
- Average low temperature in September: 54.1°F
The month with the highest average low temperature is July (62.8°F).
The coldest month (with the lowest average low temperature) is January (13.6°F).
Average pressure in September
Belvidere, IL
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in September
Belvidere, IL
- Average wind speed in September: 7.2mph
The windiest month (with the highest average wind speed) is April (10mph).
The calmest month (with the lowest average wind speed) is August (6.2mph).
Average humidity in September
Belvidere, IL
- Average humidity in September: 80%
The month with the highest relative humidity is January (86%).
The month with the lowest relative humidity is October (75%).
Average rainfall in September
Belvidere, IL
- Average rainfall in September: 2.17"
The wettest month (with the highest rainfall) is June (4.09").
The driest month (with the least rainfall) is February (1.46").
Average rainfall days in September
Belvidere, IL
- Average rainfall days in September: 12.6 days
The month with the highest number of rainy days is May (18.9 days).
The month with the least rainy days is February (5.6 days).
Average snowfall in September
Belvidere, IL
- Average snowfall in September: 0"
The month with the highest snowfall is January (5.35").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Belvidere, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (12.6 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
Belvidere, 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 months with the most sunshine are July and August (Average sunshine: 9h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in September
Belvidere, IL
- Average sunshine days in September: 15.1 days
The month with the most sunshine days is November (17.3 days).
The month with the least sunshine days is June (10.2 days).
Average UV index in September
Belvidere, IL
- Average UV index in September: 4
The month with the highest UV index is June (UV index 6).
The months with the lowest UV index are January, November and December (UV index 1).
Average cloud cover in September
Belvidere, IL
- Average cloud cover in September: 34
The month with the most cloud cover is January (Cloud cover 63).
The months with the least cloud cover are August and September (Cloud cover 34).
Average visibility in September
Belvidere, 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).
Belvidere, Illinois, USA
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