September weather forecast
Saint David, IL

Weather in September

September, the first month of the autumn in Saint David, is still a warm month, with temperature in the range of an average high of 76.6°F (24.8°C) and an average low of 57.6°F (14.2°C).

Temperature

In September, the average high-temperature slightly decreases from 82°F (27.8°C) in August to a still warm 76.6°F (24.8°C). The average low-temperature, in Saint David, is 57.6°F (14.2°C).

Humidity

The average relative humidity in September in Saint David, Illinois, is 75%.

Rainfall

In Saint David, Illinois, during 11 rainfall days, 2.09" (53mm) of precipitation is typically accumulated. Throughout the year, there are 131.7 rainfall days, and 22.48" (571mm) of precipitation is accumulated.

Snowfall

May through September are months without snowfall in Saint David.

Daylight

In September, the average length of the day in Saint David is 12h and 27min.
On the first day of the month, sunrise is at 6:27 am and sunset at 7:32 pm. On the last day of September, in Saint David, sunrise is at 6:55 am and sunset at 6:44 pm CDT.

Sunshine

In Saint David, the average sunshine in September is 9.3h.

UV index

The average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for average individuals.
Note: The average daily UV index of 4 in September transform into the following instructions:
Take precautions - Protection against sunburn is recommended. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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.
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FAQ

What is the temperature in September in Saint David?

The average high-temperature, in September, in Saint David, Illinois, is 76.6°F (24.8°C), while the average low-temperature is 57.6°F (14.2°C). The average heat index (a.k.a. 'real feel', 'apparent temperature'), which combines relative humidity and air temperature, in August is evaluated at 89.6°F (32°C).

What is the average humidity in September in Saint David?

In Saint David, the average relative humidity in September is 75%.

How many days does it rain in September in Saint David?

In September, in Saint David, the rain falls for 11 days. Throughout September, 2.09" (53mm) of precipitation is accumulated.

When it does not snow in Saint David?

May through September are months without snowfall in Saint David, Illinois.

Does it snow in Saint David in September?

In Saint David, in September, it doesn't snow. In October, it regularly snows.

How many hours of daylight does Saint David have in September?

In Saint David, Illinois, the average day length in September is 12h and 27min.

When is the sunrise / sunset in September in Saint David?

On the first day of September in Saint David, Illinois, sunrise is at 6:27 am and sunset at 7:32 pm. On the last day of the month, sunrise is at 6:55 am and sunset at 6:44 pm CDT.

How many hours of sunshine does Saint David have in September?

The average sunshine duration in September in Saint David is 9.3h.

What is the UV index reading in September in Saint David?

In September, the average daily maximum UV index in Saint David, Illinois, is 4. A UV Index estimate of 3 to 5 represents a moderate health threat from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Saint David, IL

Average temperature in September - Saint David, IL
  • Average high temperature in September: 76.6°F

The warmest month (with the highest average high temperature) is July (82.8°F).
The month with the lowest average high temperature is January (31.5°F).

  • Average low temperature in September: 57.6°F

The month with the highest average low temperature is July (65.8°F).
The coldest month (with the lowest average low temperature) is January (19.4°F).

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Average pressure in September
Saint David, IL

Average pressure in September - Saint David, IL
  • Average pressure in September: 30.02"Hg

The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

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Average wind speed in September
Saint David, IL

Average wind speed in September - Saint David, IL
  • Average wind speed in September: 7.5mph

The windiest month (with the highest average wind speed) is April (10.4mph).
The calmest months (with the lowest average wind speed) are July and August (6.5mph).

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Average humidity in September
Saint David, IL

Average humidity in September - Saint David, IL
  • Average humidity in September: 75%

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

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Average rainfall in September
Saint David, IL

Average rainfall in September - Saint David, IL
  • Average rainfall in September: 2.09"

The wettest month (with the highest rainfall) is May (3.23").
The driest month (with the least rainfall) is December (0.94").

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Average rainfall days in September
Saint David, IL

Average rainfall days in September - Saint David, IL
  • Average rainfall days in September: 11 days

The month with the highest number of rainy days is May (16.7 days).
The month with the least rainy days is February (4.7 days).

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Average snowfall in September
Saint David, IL

Average snowfall in September - Saint David, IL
  • Average snowfall in September: 0"

The month with the highest snowfall is January (3.35").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in September
Saint David, IL

Average snowfall days in September - Saint David, IL
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (9.4 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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Average daylight in September /
Average sunshine in September
Saint David, IL

Average daylight in September / Average sunshine in September - Saint David, IL
  • Average daylight in September: 12h and 27min

The month with the longest days is June (Average daylight: 15h and 1min).
The month with the shortest days is December (Average daylight: 9h and 20min).

  • Average sunshine in September: 9h and 18min

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

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Average sunshine days in September
Saint David, IL

Average sunshine days in September - Saint David, IL
  • Average sunshine days in September: 17.1 days

The month with the most sunshine days is December (20.4 days).
The month with the least sunshine days is June (11.1 days).

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Average UV index in September
Saint David, IL

Average UV index in September - Saint David, IL
  • Average UV index in September: 4

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

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Average cloud cover in September
Saint David, IL

Average cloud cover in September - Saint David, IL
  • Average cloud cover in September: 29

The month with the most cloud cover is January (Cloud cover 56).
The month with the least cloud cover is September (Cloud cover 29).

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Average visibility in September
Saint David, IL

Average visibility in September - Saint David, 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).

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