September weather forecast
Okawville, IL

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Weather in September

The first month of the autumn, September, is still a warm month in Okawville, Illinois, with an average temperature fluctuating between 59.9°F (15.5°C) and 79.2°F (26.2°C).

Temperature

The transition into September marks the average high-temperature at a still warm 79.2°F (26.2°C), differing minimally from August's 84.4°F (29.1°C). An average low-temperature of 59.9°F (15.5°C) is observed in Okawville during the September nights.

Humidity

In September, the average relative humidity is 74%.

Rainfall

In Okawville, in September, it is raining for 14.1 days, with typically 2.09" (53mm) of accumulated precipitation. Throughout the year, in Okawville, there are 166.8 rainfall days, and 37.83" (961mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through April, September, November and December. September is the first month it typically snows. Throughout September, in the average 0.1 snowfall days, it receives 0.04" (1mm) of snow. Throughout the year, in Okawville, there are 23.2 snowfall days, and 7.87" (200mm) of snow is accumulated.

Daylight

In Okawville, the average length of the day in September is 12h and 25min.
On the first day of September, sunrise is at 6:28 am and sunset at 7:27 pm. On the last day of the month, sunrise is at 6:53 am and sunset at 6:42 pm CDT.

Sunshine

The average sunshine in September is 9.3h.

UV index

In Okawville, the average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a moderate health risk from unsafe exposure to UV radiation for the average person.
Note: The maximum daily UV index of 5 during September translates into the following directions:
Undertake protective steps - Obligation to safeguard skin and eyes from harm is in place. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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Frequently asked questions

What is the usual temperature for Okawville in September?

An average high-temperature, in September, in Okawville, is 79.2°F (26.2°C) and the average low-temperature is 59.9°F (15.5°C). The average heat index (a.k.a. 'felt air temperature', 'real feel'), which represents the influence of relative humidity on air temperature, in August is appraised at 95°F (35°C).

What is the average humidity in September in Okawville?

In September, the average relative humidity is 74%.

How much does it rain in Okawville in September?

In Okawville, during September, the rain falls for 14.1 days and regularly aggregates up to 2.09" (53mm) of precipitation.

When does it start snowing in Okawville?

September is the first month it typically snows. Throughout September, in the average 0.1 snowfall days, it receives 0.04" (1mm) of snow.

How many hours of daylight does Okawville have in September?

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

What time are sunrise and sunset in September in Okawville?

In September, on the first day of the month, sunrise is at 6:28 am and sunset at 7:27 pm. On the last day of the month, in Okawville, sunrise is at 6:53 am and sunset at 6:42 pm CDT.

How long on average sun shines in September in Okawville?

The average sunshine duration in September is 9.3h.

How high is the UV index in September in Okawville?

In Okawville, Illinois, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a moderate vulnerability from unsafe 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
Okawville, IL

Average temperature in September - Okawville, IL
  • Average high temperature in September: 79.2°F

The warmest month (with the highest average high temperature) is July (86°F).
The month with the lowest average high temperature is January (37.9°F).

  • Average low temperature in September: 59.9°F

The month with the highest average low temperature is July (68.4°F).
The coldest month (with the lowest average low temperature) is January (25°F).

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Average pressure in September
Okawville, IL

Average pressure in September - Okawville, 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 (29.93"Hg).

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Average wind speed in September
Okawville, IL

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

The windiest month (with the highest average wind speed) is January (9.7mph).
The calmest month (with the lowest average wind speed) is July (5.7mph).

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Average humidity in September
Okawville, IL

Average humidity in September - Okawville, IL
  • Average humidity in September: 74%

The month with the highest relative humidity is May (80%).
The month with the lowest relative humidity is October (71%).

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Average rainfall in September
Okawville, IL

Average rainfall in September - Okawville, IL
  • Average rainfall in September: 2.09"

The wettest month (with the highest rainfall) is April (4.45").
The driest month (with the least rainfall) is February (2.01").

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Average rainfall days in September
Okawville, IL

Average rainfall days in September - Okawville, IL
  • Average rainfall days in September: 14.1 days

The month with the highest number of rainy days is May (19.3 days).
The month with the least rainy days is December (9.2 days).

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Average snowfall in September
Okawville, IL

Average snowfall in September - Okawville, IL
  • Average snowfall in September: 0.04"

The month with the highest snowfall is January (2.4").
The months with the least snowfall are May, June, July, August and October (0").

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Average snowfall days in September
Okawville, IL

Average snowfall days in September - Okawville, IL
  • Average snowfall days in September: 0.1 days

The month with the highest number of snowfall days is January (7.3 days).
The months with the least snowfall days are May, June, July and August (0 days).

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

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

The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in September: 9h and 2min

The month with the most sunshine is June (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 36min).

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Average sunshine days in September
Okawville, IL

Average sunshine days in September - Okawville, IL
  • Average sunshine days in September: 14.5 days

The months with the most sunshine days are October and November (17.5 days).
The month with the least sunshine days is May (9.3 days).

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Average UV index in September
Okawville, IL

Average UV index in September - Okawville, 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).

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Average cloud cover in September
Okawville, IL

Average cloud cover in September - Okawville, IL
  • Average cloud cover in September: 29

The month with the most cloud cover is January (Cloud cover 50).
The month with the least cloud cover is June (Cloud cover 28).

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Average visibility in September
Okawville, IL

Average visibility in September - Okawville, 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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Okawville, Illinois, USA

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