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
With September's onset, the weather reveals a slight temperature decrease, transitioning from 80.2°F (26.8°C) in August to a still warm 74.3°F (23.5°C). During September, Mokena's temperature averages to a mild 57°F (13.9°C) at night.Humidity
The average relative humidity in September in Mokena is 77%.Rainfall
In Mokena, in September, during 13.2 rainfall days, 2.52" (64mm) of precipitation is typically accumulated. In Mokena, during the entire year, the rain falls for 149.8 days and collects up to 31.26" (794mm) of precipitation.Snowfall
May through September are months without snowfall.Daylight
The average length of the day in September in Mokena, Illinois, is 12h and 28min.On the first day of the month, sunrise is at 6:18 am and sunset at 7:24 pm. On the last day of September, sunrise is at 6:48 am and sunset at 6:34 pm CDT.
Sunshine
The average sunshine in September in Mokena is 8.3h.UV index
In Mokena, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from unsafe exposure to UV radiation for average individuals.Note: In September, the average maximum UV index of 4 translates into the following recommendations:
Adopt protective measures - Suggestions to resist sunburn are offered. Avoiding the Sun during its peak radiation time around midday is a healthy practice. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation.
Frequently asked questions
What are September temperatures in Mokena?
What is the average humidity in September in Mokena?
How much does it rain in Mokena in September?
When it does not snow in Mokena?
Does it snow in Mokena in September?
What is the average length of the day in September in Mokena?
When are sunrise and sunset in September in Mokena?
How long on average sun shines in September in Mokena?
How high is the UV index in September in Mokena?
Average temperature in September
Mokena, IL
- Average high temperature in September: 74.3°F
The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is January (29.3°F).
- Average low temperature in September: 57°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 (17.4°F).
Average pressure in September
Mokena, 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
Mokena, IL
- Average wind speed in September: 7mph
The windiest month (with the highest average wind speed) is January (9.7mph).
The calmest month (with the lowest average wind speed) is August (6mph).
Average humidity in September
Mokena, IL
- Average humidity in September: 77%
The month with the highest relative humidity is February (83%).
The month with the lowest relative humidity is October (73%).
Average rainfall in September
Mokena, IL
- Average rainfall in September: 2.52"
The wettest month (with the highest rainfall) is May (4.21").
The driest months (with the least rainfall) are February and December (1.61").
Average rainfall days in September
Mokena, IL
- Average rainfall days in September: 13.2 days
The months with the highest number of rainy days are June and July (17.3 days).
The month with the least rainy days is February (5.3 days).
Average snowfall in September
Mokena, IL
- Average snowfall in September: 0"
The month with the highest snowfall is January (4.53").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Mokena, 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
Mokena, 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 2min
The month with the most sunshine is August (Average sunshine: 9h and 36min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).
Average sunshine days in September
Mokena, IL
- Average sunshine days in September: 15 days
The month with the most sunshine days is November (17.1 days).
The month with the least sunshine days is April (10.7 days).
Average UV index in September
Mokena, IL
- Average UV index in September: 4
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in September
Mokena, IL
- Average cloud cover in September: 35
The month with the most cloud cover is January (Cloud cover 62).
The month with the least cloud cover is August (Cloud cover 34).
Average visibility in September
Mokena, IL
- Average visibility in September: 6mi
The months with the highest visibility are March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are January, February, July and August (5mi).
Mokena, Illinois, USA
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