September weather forecast
Cypress, IL

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Weather in September

The first month of the autumn, September, is still a warm month in Cypress, Illinois, with an average temperature fluctuating between 81.1°F (27.3°C) and 60.6°F (15.9°C).

Temperature

September ushers in a minor alteration in Cypress's climate, with the average high-temperature moving from August's tropical 86.5°F (30.3°C) to a warm 81.1°F (27.3°C). During September, Cypress consistently records a temperature low averaging a refreshing 60.6°F (15.9°C).

Heat index

In September, the heat index is appraised at a hot 86°F (30°C). Prolonged activity during exposure might result in a state of fatigue and cause heat cramps.
Heat index determinations are made taking into account the shade and light air movements. Direct sunlight exposure may cause a 15 Fahrenheit (8 Celsius) degrees rise in the heat index.
Note: The heat index, also known as 'feels like' or 'real feel', gives a temperature feeling by integrating air temperature and humidity. An individual's perception of weather can be swayed by a variety of elements including metabolic differences, pregnancy status, and their level of physical exertion. Direct exposure to the sun's rays can enhance the felt temperature, increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are primarily vital for children. Typically, young kids are at a higher risk than adults since they sweat less. Also, the larger skin surface in proportion to their small bodies and the heightened heat production due to their active nature adds to their vulnerability.

Humidity

In Cypress, the average relative humidity in September is 73%.

Rainfall

September is the month with the least rainfall. Rain falls for 8.3 days and accumulates 0.47" (12mm) of precipitation.

Snowfall

In Cypress, snow does not fall in April through October.

Daylight

In Cypress, the average length of the day in September is 12h and 25min.
On the first day of the month, sunrise is at 6:27 am and sunset at 7:24 pm. On the last day of September, sunrise is at 6:51 am and sunset at 6:40 pm CDT.

Sunshine

The average sunshine in September in Cypress is 9.4h.

UV index

The average daily maximum UV index in September in Cypress is 5. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for the average person.
Note: The UV index of 5 during September translates into the following guidance:
Exercise caution. Those with pale skin may experience burns in less than half an hour. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage.

Frequently asked questions

What is the usual temperature for Cypress in September?

The average high-temperature and low-temperature in Cypress, Illinois, during September are 81.1°F (27.3°C) and 60.6°F (15.9°C) respectively. In September, the average heat index (a.k.a. 'apparent temperature', 'real feel'), which combines relative humidity and air temperature, is appraised at 86°F (30°C).

What is the average humidity in September in Cypress?

In Cypress, the average relative humidity in September is 73%.

What is the driest month in Cypress?

The month with the least rainfall in Cypress, Illinois, is September, when the rain falls for 8.3 days and typically collects 0.47" (12mm) of precipitation.

How many days does it rain in September in Cypress?

In Cypress, Illinois, in September, during 8.3 rainfall days, 0.47" (12mm) of precipitation is typically accumulated.

When it does not snow in Cypress?

In Cypress, Illinois, snow does not fall in April through October.

What is the average length of the day in September in Cypress?

In Cypress, Illinois, the average day length in September is 12h and 25min.

When is the sunrise / sunset in September in Cypress?

In September, on the first day of the month, sunrise is at 6:27 am and sunset at 7:24 pm. On the last day of the month, in Cypress, Illinois, sunrise is at 6:51 am and sunset at 6:40 pm CDT.

How long on average sun shines in September in Cypress?

In September, the average sunshine duration in Cypress, Illinois, is 9.4h.

What is the UV index intensity in September in Cypress?

The average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate health threat from exposure to Sun's UV rays.
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
Cypress, IL

Average temperature in September - Cypress, IL
  • Average high temperature in September: 81.1°F

The warmest month (with the highest average high temperature) is July (88°F).
The month with the lowest average high temperature is January (40.1°F).

  • Average low temperature in September: 60.6°F

The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (27°F).

Average pressure in September
Cypress, IL

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

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

Average wind speed in September
Cypress, IL

Average wind speed in September - Cypress, IL
  • Average wind speed in September: 6.3mph

The windiest months (with the highest average wind speed) are January and February (9mph).
The calmest months (with the lowest average wind speed) are July and August (5.7mph).

Average humidity in September
Cypress, IL

Average humidity in September - Cypress, IL
  • Average humidity in September: 73%

The months with the highest relative humidity are March and May (79%).
The month with the lowest relative humidity is October (71%).

Average rainfall in September
Cypress, IL

Average rainfall in September - Cypress, IL
  • Average rainfall in September: 0.47"

The wettest month (with the highest rainfall) is June (1.5").
The driest month (with the least rainfall) is September (0.47").

Average rainfall days in September
Cypress, IL

Average rainfall days in September - Cypress, IL
  • Average rainfall days in September: 8.3 days

The month with the highest number of rainy days is July (13.1 days).
The months with the least rainy days are January, February and December (7.3 days).

Average snowfall in September
Cypress, IL

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

The month with the highest snowfall is February (0.67").
The months with the least snowfall are April, May, June, July, August, September and October (0").

Average snowfall days in September
Cypress, IL

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

The month with the highest number of snowfall days is January (3.3 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
Cypress, IL

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

The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).

  • Average sunshine in September: 9h and 2min

The months with the most sunshine are June and July (Average sunshine: 10h and 24min).
The months with the least sunshine are January and February (Average sunshine: 4h and 36min).

Average sunshine days in September
Cypress, IL

Average sunshine days in September - Cypress, IL
  • Average sunshine days in September: 19.1 days

The month with the most sunshine days is October (21.5 days).
The month with the least sunshine days is June (14.8 days).

Average UV index in September
Cypress, IL

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

The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February and December (UV index 2).

Average cloud cover in September
Cypress, IL

Average cloud cover in September - Cypress, IL
  • Average cloud cover in September: 28

The months with the most cloud cover are January and February (Cloud cover 51).
The month with the least cloud cover is September (Cloud cover 28).

Average visibility in September
Cypress, IL

Average visibility in September - Cypress, 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).

Cypress, Illinois, USA

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