September weather forecast
Cairo, IL

Weather in September

The first month of the autumn, September, is still a warm month in Cairo, Illinois, with an average temperature varying between 61.9°F (16.6°C) and 81.5°F (27.5°C).

Temperature

In September, the average high-temperature is almost the same as in August - a moderately hot 81.5°F (27.5°C). In September, in Cairo, the average low-temperature is 61.9°F (16.6°C).

Heat index

In September, the average heat index is appraised at 85.8°F (29.9°C). Exhaustion is likely with prolonged exposure and activity. Sustaining activity may result in heat cramps.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel', 'felt air temperature', 'apparent temperature', or 'feels like', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (pregnancy, differences in body mass, height, and shape, wind). Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.

Humidity

The average relative humidity in September in Cairo is 72%.

Rainfall

The month with the least rainfall in Cairo is September, when the rain falls for 11.4 days and typically collects 1.42" (36mm) of precipitation.

Snowfall

May through September are months without snowfall in Cairo.

Daylight

In September, the average length of the day is 12h and 25min.
On the first day of September in Cairo, sunrise is at 6:27 am and sunset at 7:25 pm. On the last day of the month, sunrise is at 6:51 am and sunset at 6:41 pm CDT.

Sunshine

The average sunshine in September is 9.6h.

UV index

In Cairo, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for average individuals.
Note: The average daily UV index of 5 in September transform into the following instructions:
Take precautions - Protection against sunburn is recommended. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
[Resources]

FAQ

What is the temperature in September in Cairo?

In September, the average high-temperature is 81.5°F (27.5°C), and the average low-temperature is 61.9°F (16.6°C). The average heat index (a.k.a. 'real feel', 'felt air temperature'), which takes the relative humidity and factors it into the air temperature reading, in September is appraised at 85.8°F (29.9°C).

What is the average humidity in September in Cairo?

In Cairo, Illinois, the average relative humidity in September is 72%.

What is the driest month in Cairo?

September is the month with the least rainfall in Cairo. Rain falls for 11.4 days and accumulates 1.42" (36mm) of precipitation.

How much does it rain in Cairo in September?

In Cairo, in September, it is raining for 11.4 days, with typically 1.42" (36mm) of accumulated precipitation.

When it does not snow in Cairo?

In Cairo, Illinois, snow does not fall in May through September.

Does it snow in Cairo in September?

In Cairo, Illinois, in September, it doesn't snow. In October, it regularly snows.

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

The average day length in September is 12h and 25min.

What time are sunrise and sunset in September in Cairo?

On the first day of September, sunrise is at 6:27 am and sunset at 7:25 pm. On the last day of the month, sunrise is at 6:51 am and sunset at 6:41 pm CDT.

How many hours of sunshine does Cairo have in September?

In September, the average sunshine duration in Cairo, Illinois, is 9.6h.

How high is the UV index in September in Cairo?

In Cairo, the average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Cairo, IL

Average temperature in September - Cairo, IL
  • Average high temperature in September: 81.5°F

The warmest month (with the highest average high temperature) is July (88.2°F).
The month with the lowest average high temperature is January (41.2°F).

  • Average low temperature in September: 61.9°F

The month with the highest average low temperature is July (69.8°F).
The coldest month (with the lowest average low temperature) is January (28.4°F).

[Resources]

Average pressure in September
Cairo, IL

Average pressure in September - Cairo, IL
  • Average pressure in September: 30.02"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).

[Resources]

Average wind speed in September
Cairo, IL

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

The windiest months (with the highest average wind speed) are January, February and March (9.1mph).
The calmest months (with the lowest average wind speed) are July and August (5.7mph).

[Resources]

Average humidity in September
Cairo, IL

Average humidity in September - Cairo, IL
  • Average humidity in September: 72%

The months with the highest relative humidity are February, March, May and December (78%).
The month with the lowest relative humidity is October (69%).

[Resources]

Average rainfall in September
Cairo, IL

Average rainfall in September - Cairo, IL
  • Average rainfall in September: 1.42"

The wettest month (with the highest rainfall) is April (4.21").
The driest month (with the least rainfall) is September (1.42").

[Resources]

Average rainfall days in September
Cairo, IL

Average rainfall days in September - Cairo, IL
  • Average rainfall days in September: 11.4 days

The month with the highest number of rainy days is May (17.1 days).
The month with the least rainy days is January (9.8 days).

[Resources]

Average snowfall in September
Cairo, IL

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

The month with the highest snowfall is February (1.5").
The months with the least snowfall are May, June, July, August and September (0").

[Resources]

Average snowfall days in September
Cairo, IL

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

The month with the highest number of snowfall days is February (3.8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

[Resources]

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

Average daylight in September / Average sunshine in September - Cairo, IL
  • Average daylight in September: 12h and 25min

The month with the longest days is June (Average daylight: 14h and 40min).
The month with the shortest days is December (Average daylight: 9h and 40min).

  • Average sunshine in September: 9h and 36min

The month with the most sunshine is June (Average sunshine: 10h and 42min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).

[Resources]

Average sunshine days in September
Cairo, IL

Average sunshine days in September - Cairo, IL
  • Average sunshine days in September: 16.5 days

The month with the most sunshine days is October (18.5 days).
The month with the least sunshine days is May (12.3 days).

[Resources]

Average UV index in September
Cairo, IL

Average UV index in September - Cairo, 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).

[Resources]

Average cloud cover in September
Cairo, IL

Average cloud cover in September - Cairo, IL
  • Average cloud cover in September: 27

The month with the most cloud cover is February (Cloud cover 49).
The month with the least cloud cover is June (Cloud cover 26).

[Resources]

Average visibility in September
Cairo, IL

Average visibility in September - Cairo, 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).

[Resources]

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location
* you will be automatically redirected to the weather forecast for your location