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 arrival of September correlates with a minor temperature reduction, down from August's warm 78.1°F (25.6°C) to a pleasant 72.3°F (22.4°C). Throughout September, the average low-temperature dips to a fresh 53.8°F (12.1°C).Humidity
The average relative humidity in September in Machesney Park is 80%.Rainfall
In Machesney Park, in September, during 10.1 rainfall days, 1.02" (26mm) of precipitation is typically accumulated. In Machesney Park, during the entire year, the rain falls for 123.8 days and collects up to 14.49" (368mm) of precipitation.Snowfall
May through September are months without snowfall.Daylight
In Machesney Park, the average length of the day in September is 12h and 28min.On the first day of the month, sunrise is at 6:22 am and sunset at 7:29 pm. On the last day of September, sunrise is at 6:52 am and sunset at 6:38 pm CDT.
Sunshine
In September, the average sunshine is 8.6h.UV index
In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for ordinary individuals.Note: The UV index of 4 in September translates into these instructions:
Prioritize safety - The need to safeguard skin and eyes from harm is emphasized. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays.
Frequently asked questions
What is the usual temperature for Machesney Park in September?
What is the average humidity in September in Machesney Park?
How many days does it rain in September in Machesney Park?
When it does not snow in Machesney Park?
Does it snow in Machesney Park in September?
How many hours of daylight does Machesney Park have in September?
When are sunrise and sunset in September in Machesney Park?
How many hours of sunshine does Machesney Park have in September?
How high is the UV index in September in Machesney Park?
Average temperature in September
Machesney Park, 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 (25.5°F).
- Average low temperature in September: 53.8°F
The month with the highest average low temperature is July (63°F).
The coldest month (with the lowest average low temperature) is January (13.5°F).
Average pressure in September
Machesney Park, 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
Machesney Park, 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
Machesney Park, 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
Machesney Park, IL
- Average rainfall in September: 1.02"
The wettest month (with the highest rainfall) is June (2.2").
The driest month (with the least rainfall) is February (0.51").
Average rainfall days in September
Machesney Park, IL
- Average rainfall days in September: 10.1 days
The month with the highest number of rainy days is May (16.5 days).
The month with the least rainy days is January (3.8 days).
Average snowfall in September
Machesney Park, IL
- Average snowfall in September: 0"
The month with the highest snowfall is January (1.93").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Machesney Park, 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
Machesney Park, 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 6min).
- Average sunshine in September: 8h and 4min
The month with the most sunshine is July (Average sunshine: 9h and 42min).
The months with the least sunshine are January and February (Average sunshine: 3h and 36min).
Average sunshine days in September
Machesney Park, IL
- Average sunshine days in September: 18.1 days
The month with the most sunshine days is November (19.7 days).
The month with the least sunshine days is June (11.4 days).
Average UV index in September
Machesney Park, 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 and December (UV index 1).
Average cloud cover in September
Machesney Park, 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
Machesney Park, 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).
Machesney Park, Illinois, USA
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