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
Streamwood's September weather features a light decline in high-temperatures, reducing from a warm 79.9°F (26.6°C) in August to a still moderately hot 73.4°F (23°C). An average minimum temperature of 56.8°F (13.8°C) marks the month of September in Streamwood.Humidity
In September, the average relative humidity in Streamwood is 76%.Rainfall
In Streamwood, in September, it is raining for 12.5 days, with typically 1.65" (42mm) of accumulated precipitation. Throughout the year, in Streamwood, Illinois, there are 141.5 rainfall days, and 22.76" (578mm) of precipitation is accumulated.Snowfall
In Streamwood, snow does not fall in June through September.Daylight
In Streamwood, the average length of the day in September is 12h and 28min.On the first day of September in Streamwood, sunrise is at 6:19 am and sunset at 7:25 pm. On the last day of the month, sunrise is at 6:49 am and sunset at 6:35 pm CDT.
Sunshine
In Streamwood, the average sunshine in September is 8.6h.UV index
The average daily maximum UV index in September in Streamwood is 4. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for the ordinary person.Note: A typical high UV index of 4 in September suggests the following recommendations:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure.
Frequently asked questions
What is the average September temperature in Streamwood?
What is the average humidity in September in Streamwood?
How much does it rain in Streamwood in September?
When it does not snow in Streamwood?
Does it snow in Streamwood in September?
What is the average length of the day in September in Streamwood?
When are sunrise and sunset in September in Streamwood?
How long on average sun shines in September in Streamwood?
What is the UV index intensity in September in Streamwood?
Average temperature in September
Streamwood, IL
- Average high temperature in September: 73.4°F
The warmest month (with the highest average high temperature) is July (81.3°F).
The month with the lowest average high temperature is January (27.7°F).
- Average low temperature in September: 56.8°F
The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (16.3°F).
Average pressure in September
Streamwood, 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
Streamwood, IL
- Average wind speed in September: 7.1mph
The windiest month (with the highest average wind speed) is January (9.9mph).
The calmest month (with the lowest average wind speed) is August (6.2mph).
Average humidity in September
Streamwood, IL
- Average humidity in September: 76%
The months with the highest relative humidity are January and February (83%).
The month with the lowest relative humidity is October (74%).
Average rainfall in September
Streamwood, IL
- Average rainfall in September: 1.65"
The wettest month (with the highest rainfall) is May (2.83").
The driest month (with the least rainfall) is December (1.02").
Average rainfall days in September
Streamwood, IL
- Average rainfall days in September: 12.5 days
The month with the highest number of rainy days is July (17.4 days).
The month with the least rainy days is February (4.8 days).
Average snowfall in September
Streamwood, IL
- Average snowfall in September: 0"
The month with the highest snowfall is January (3.39").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Streamwood, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (12.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Streamwood, 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 48min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).
Average sunshine days in September
Streamwood, IL
- Average sunshine days in September: 14.5 days
The month with the most sunshine days is November (17.6 days).
The month with the least sunshine days is July (10.9 days).
Average UV index in September
Streamwood, IL
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in September
Streamwood, IL
- Average cloud cover in September: 33
The month with the most cloud cover is January (Cloud cover 62).
The months with the least cloud cover are July, August and September (Cloud cover 33).
Average visibility in September
Streamwood, IL
- Average visibility in September: 6mi
The months with the highest visibility are March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January and February (5mi).
Streamwood, Illinois, USA
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