September weather forecast
Casey, IL

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Weather in September

September, the first month of the autumn in Casey, is still a warm month, with temperature in the range of an average high of 77.4°F (25.2°C) and an average low of 59.2°F (15.1°C).

Temperature

Upon the beginning of September, Casey's high-temperatures register at a still moderately hot 77.4°F (25.2°C), closely mirroring the preceding month. During September, Casey experiences an average low-temperature of 59.2°F (15.1°C) at night.

Humidity

The average relative humidity in September in Casey is 76%.

Rainfall

In Casey, in September, during 9.5 rainfall days, 0.55" (14mm) of precipitation is typically accumulated. Throughout the year, in Casey, there are 115.9 rainfall days, and 11.26" (286mm) of precipitation is accumulated.

Snowfall

In Casey, snow does not fall in May through October.

Daylight

In Casey, the average length of the day in September is 12h and 26min.
On the first day of the month, sunrise is at 6:21 am and sunset at 7:22 pm. On the last day of September, sunrise is at 6:47 am and sunset at 6:35 pm CDT.

Sunshine

In Casey, the average sunshine in September is 9h.

UV index

The average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for ordinary individuals.
Note: The maximum daily UV index, 5 in September, converts into the following recommendations:
Make use of precautions - It is urged to ward off sun damage. Protect yourself from the midday Sun's peak UV radiation by minimizing exposure. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration.

Frequently asked questions

What are September temperatures?

In Casey, 77.4°F (25.2°C) is the average high-temperature and 59.2°F (15.1°C) is the average low-temperature during September. The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which calculates the temperature value influenced by the moisture in the air, in August is computed to be 87.8°F (31°C).

What is the average humidity in September?

In Casey, the average relative humidity in September is 76%.

How many days does it rain in September?

In Casey, in September, during 9.5 rainfall days, 0.55" (14mm) of precipitation is typically accumulated.

When it does not snow?

In Casey, snow does not fall in May through October.

How many hours of daylight does Casey have in September?

In September, the average day length in Casey, Illinois, is 12h and 26min.

What time are sunrise and sunset in September?

On the first day of September, sunrise is at 6:21 am and sunset at 7:22 pm. On the last day of the month, sunrise is at 6:47 am and sunset at 6:35 pm CDT.

How many hours of sunshine does Casey have in September?

In Casey, Illinois, the average sunshine duration in September is 9h.

How high is the UV index in September?

The average daily maximum UV index in September in Casey is 5. A UV Index estimate of 3 to 5 represents a medium hazard to health from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Casey, IL

Average temperature in September - Casey, IL
  • Average high temperature in September: 77.4°F

The warmest month (with the highest average high temperature) is July (82.9°F).
The month with the lowest average high temperature is January (34.7°F).

  • Average low temperature in September: 59.2°F

The month with the highest average low temperature is July (66.4°F).
The coldest month (with the lowest average low temperature) is January (22.6°F).

Average pressure in September
Casey, IL

Average pressure in September - Casey, IL
  • Average pressure in September: 30.03"Hg

The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

Average wind speed in September
Casey, IL

Average wind speed in September - Casey, IL
  • Average wind speed in September: 6.9mph

The windiest months (with the highest average wind speed) are January and February (10.4mph).
The calmest months (with the lowest average wind speed) are July and August (6.1mph).

Average humidity in September
Casey, IL

Average humidity in September - Casey, IL
  • Average humidity in September: 76%

The month with the highest relative humidity is July (83%).
The month with the lowest relative humidity is October (71%).

Average rainfall in September
Casey, IL

Average rainfall in September - Casey, IL
  • Average rainfall in September: 0.55"

The wettest month (with the highest rainfall) is April (1.54").
The driest month (with the least rainfall) is February (0.47").

Average rainfall days in September
Casey, IL

Average rainfall days in September - Casey, IL
  • Average rainfall days in September: 9.5 days

The month with the highest number of rainy days is May (14.9 days).
The month with the least rainy days is February (6 days).

Average snowfall in September
Casey, IL

Average snowfall in September - Casey, IL
  • Average snowfall in September: 0"

The month with the highest snowfall is December (0.47").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in September
Casey, IL

Average snowfall days in September - Casey, IL
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (5.8 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

Average daylight in September /
Average sunshine in September
Casey, IL

Average daylight in September / Average sunshine in September - Casey, IL
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in September: 9h and 0min

The month with the most sunshine is June (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).

Average sunshine days in September
Casey, IL

Average sunshine days in September - Casey, IL
  • Average sunshine days in September: 18.2 days

The month with the most sunshine days is October (21.2 days).
The month with the least sunshine days is May (12.4 days).

Average UV index in September
Casey, IL

Average UV index in September - Casey, IL
  • Average UV index in September: 5

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
Casey, IL

Average cloud cover in September - Casey, IL
  • Average cloud cover in September: 31

The month with the most cloud cover is January (Cloud cover 55).
The month with the least cloud cover is June (Cloud cover 30).

Average visibility in September
Casey, IL

Average visibility in September - Casey, IL
  • Average visibility in September: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, September, October, November and December (6mi).
The month with the lowest visibility is August (5mi).

Casey, Illinois, USA

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