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 an agreeable 72.1°F (22.3°C). In Marengo, the September nights cool down to an average low of 54.1°F (12.3°C).Humidity
In September, the average relative humidity in Marengo is 81%.Rainfall
In Marengo, in September, during 12.8 rainfall days, 2.09" (53mm) of precipitation is typically accumulated. In Marengo, Illinois, during the entire year, the rain falls for 154.6 days and collects up to 30.31" (770mm) of precipitation.Snowfall
May through September are months without snowfall in Marengo.Daylight
In September, the average length of the day in Marengo is 12h and 28min.On the first day of September in Marengo, sunrise is at 6:20 am and sunset at 7:27 pm. On the last day of the month, sunrise is at 6:51 am and sunset at 6:37 pm CDT.
Sunshine
In Marengo, the average sunshine in September is 8.5h.UV index
The average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for average individuals.Note: In September, the maximum UV index of 4 transforms into these recommendations:
Be vigilant - Preventing sunburn is recommended. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage.
Frequently asked questions
What is the average September temperature in Marengo?
What is the average humidity in September in Marengo?
How much does it rain in Marengo in September?
When it does not snow in Marengo?
Does it snow in Marengo in September?
How many hours of daylight does Marengo have in September?
What time are sunrise and sunset in September in Marengo?
How long on average sun shines in September in Marengo?
What is the UV index reading in September in Marengo?
Average temperature in September
Marengo, IL
- Average high temperature in September: 72.1°F
The warmest month (with the highest average high temperature) is July (79.7°F).
The month with the lowest average high temperature is January (26.1°F).
- Average low temperature in September: 54.1°F
The month with the highest average low temperature is July (62.6°F).
The coldest month (with the lowest average low temperature) is January (13.8°F).
Average pressure in September
Marengo, 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
Marengo, IL
- Average wind speed in September: 7.1mph
The windiest month (with the highest average wind speed) is April (9.9mph).
The calmest month (with the lowest average wind speed) is August (6.1mph).
Average humidity in September
Marengo, IL
- Average humidity in September: 81%
The month with the highest relative humidity is January (86%).
The month with the lowest relative humidity is October (76%).
Average rainfall in September
Marengo, IL
- Average rainfall in September: 2.09"
The wettest month (with the highest rainfall) is June (4.21").
The driest months (with the least rainfall) are February and November (1.5").
Average rainfall days in September
Marengo, IL
- Average rainfall days in September: 12.8 days
The month with the highest number of rainy days is July (19.3 days).
The month with the least rainy days is February (4.8 days).
Average snowfall in September
Marengo, IL
- Average snowfall in September: 0"
The month with the highest snowfall is January (5.28").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Marengo, 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 May, June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Marengo, 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 3min
The month with the most sunshine is July (Average sunshine: 9h and 36min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).
Average sunshine days in September
Marengo, IL
- Average sunshine days in September: 14.8 days
The month with the most sunshine days is November (17.5 days).
The month with the least sunshine days is June (9.5 days).
Average UV index in September
Marengo, 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
Marengo, IL
- Average cloud cover in September: 35
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 35).
Average visibility in September
Marengo, 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).
Marengo, Illinois, USA
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