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 introduces a mild reduction in the average high-temperature, from a moderately hot 79.3°F (26.3°C) in August to a still warm 73.8°F (23.2°C). In South Holland, September nights witness a steady temperature drop to a mild 59.2°F (15.1°C).Humidity
In South Holland, the average relative humidity in September is 75%.Rainfall
In South Holland, during September, the rain falls for 9.8 days and regularly aggregates up to 0.91" (23mm) of precipitation. Throughout the year, there are 110.3 rainfall days, and 10.31" (262mm) of precipitation is accumulated.Snowfall
May through September are months without snowfall in South Holland.Daylight
In September, the average length of the day in South Holland is 12h and 28min.On the first day of September in South Holland, sunrise is at 6:17 am and sunset at 7:23 pm. On the last day of the month, sunrise is at 6:46 am and sunset at 6:33 pm CDT.
Sunshine
The average sunshine in September is 8.9h.UV index
In September, the average daily maximum UV index in South Holland is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for the ordinary person.Note: A daily maximum UV index of 4 in September translates into the following instructions:
Undertake protective steps - Obligation to safeguard skin and eyes from harm is in place. Considering the Sun's intensity during midday, it's wise to minimize direct exposure. Tightly woven clothing, when worn loosely, shields effectively against the Sun.
Frequently asked questions
What is the usual temperature for South Holland in September?
What is the average humidity in September in South Holland?
How many days does it rain in September in South Holland?
When it does not snow in South Holland?
Does it snow in South Holland in September?
How many hours of daylight does South Holland have in September?
When are sunrise and sunset in September in South Holland?
How many hours of sunshine does South Holland have in September?
What is the UV index intensity in September in South Holland?
Average temperature in September
South Holland, IL
- Average high temperature in September: 73.8°F
The warmest month (with the highest average high temperature) is July (80.1°F).
The month with the lowest average high temperature is January (29.8°F).
- Average low temperature in September: 59.2°F
The month with the highest average low temperature is July (66.9°F).
The coldest month (with the lowest average low temperature) is January (19.6°F).
Average pressure in September
South Holland, 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
South Holland, IL
- Average wind speed in September: 8mph
The windiest month (with the highest average wind speed) is January (11mph).
The calmest months (with the lowest average wind speed) are July and August (6.8mph).
Average humidity in September
South Holland, IL
- Average humidity in September: 75%
The months with the highest relative humidity are January and February (82%).
The month with the lowest relative humidity is October (72%).
Average rainfall in September
South Holland, IL
- Average rainfall in September: 0.91"
The wettest months (with the highest rainfall) are May and June (1.38").
The driest months (with the least rainfall) are February and December (0.47").
Average rainfall days in September
South Holland, IL
- Average rainfall days in September: 9.8 days
The month with the highest number of rainy days is July (14 days).
The month with the least rainy days is February (4.1 days).
Average snowfall in September
South Holland, IL
- Average snowfall in September: 0"
The month with the highest snowfall is January (1.1").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
South Holland, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (9.3 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
South Holland, IL
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in September: 8h and 5min
The month with the most sunshine is August (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).
Average sunshine days in September
South Holland, IL
- Average sunshine days in September: 16.9 days
The month with the most sunshine days is December (19.8 days).
The month with the least sunshine days is June (13.1 days).
Average UV index in September
South Holland, IL
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in September
South Holland, IL
- Average cloud cover in September: 31
The month with the most cloud cover is January (Cloud cover 62).
The month with the least cloud cover is August (Cloud cover 28).
Average visibility in September
South Holland, IL
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
South Holland, Illinois, USA
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