September weather forecast
Chester, OK

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Weather in September

The first month of the autumn, September, is also a moderately hot month in Chester, Oklahoma, with an average temperature varying between 65.3°F (18.5°C) and 84.2°F (29°C).

Temperature

The start of September signals a gentle decrease in the average high-temperature, transitioning from a hot 92.8°F (33.8°C) in August to a moderately hot 84.2°F (29°C). During September, Chester experiences a consistent low-temperature average of 65.3°F (18.5°C).

Heat index

For September, the heat index is computed to be a hot 87.8°F (31°C). Persistent activity under exposure might lead to a feeling of weariness, with subsequent heat cramps.
Take note of the fact that heat index values are based on shaded circumstances with light airflows. Exposure to the direct sun might augment heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', is the outcome of merging air's temperature and its humidity metrics. One's perception of weather can be shaped by other factors, involving metabolic differences, pregnancy, and physical exertion. Take note that direct exposure to the sun can increase the felt temperature, possibly adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are especially vital to children. In general, children are more at risk than adults because they sweat less. Furthermore, the large skin surface compared to their small bodies and the high heat production due to their actions contribute to this vulnerability.

Humidity

In Chester, the average relative humidity in September is 60%.

Rainfall

In September, the rain falls for 11.2 days. Throughout September, 1.34" (34mm) of precipitation is accumulated. In Chester, during the entire year, the rain falls for 93.7 days and collects up to 15.55" (395mm) of precipitation.

Snowfall

In Chester, snow does not fall in May through September.

Daylight

In September, the average length of the day is 12h and 24min.
On the first day of the month, sunrise is at 7:07 am and sunset at 8:02 pm. On the last day of September, in Chester, sunrise is at 7:30 am and sunset at 7:20 pm CDT.

Sunshine

In Chester, the average sunshine in September is 8.8h.

UV index

The average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for average individuals.
Note: In September, a regular UV index of 5 translates into these guidelines:
Be vigilant - Suggestions to stave off sun damage are provided. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. Boost your sun resistance with garments that are densely woven yet spacious.
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Frequently asked questions

How hot is it in Chester in September?

An average high-temperature, in September, in Chester, is 84.2°F (29°C) and the average low-temperature is 65.3°F (18.5°C). In September, the average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which represents the influence of relative humidity on air temperature, is computed to be 87.8°F (31°C).

What is the average humidity in September in Chester?

In Chester, the average relative humidity in September is 60%.

How many days does it rain in September in Chester?

In Chester, during September, the rain falls for 11.2 days and regularly aggregates up to 1.34" (34mm) of precipitation.

When it does not snow in Chester?

May through September are months without snowfall in Chester.

Does it snow in Chester in September?

In Chester, Oklahoma, in September, it doesn't snow. In October, it regularly snows.

How many hours of daylight does Chester have in September?

In September, the average day length in Chester is 12h and 24min.

When is the sunrise / sunset in September in Chester?

On the first day of September in Chester, sunrise is at 7:07 am and sunset at 8:02 pm. On the last day of the month, sunrise is at 7:30 am and sunset at 7:20 pm CDT.

How long on average sun shines in September in Chester?

In Chester, the average sunshine duration in September is 8.8h.

What is the UV index reading in September in Chester?

In Chester, Oklahoma, the average daily maximum UV index in September is 5. 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 daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Chester, OK

Average temperature in September - Chester, OK
  • Average high temperature in September: 84.2°F

The warmest month (with the highest average high temperature) is July (94.3°F).
The month with the lowest average high temperature is December (47.7°F).

  • Average low temperature in September: 65.3°F

The month with the highest average low temperature is July (73.8°F).
The coldest month (with the lowest average low temperature) is January (30.6°F).

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Average pressure in September
Chester, OK

Average pressure in September - Chester, OK
  • Average pressure in September: 29.98"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.86"Hg).

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Average wind speed in September
Chester, OK

Average wind speed in September - Chester, OK
  • Average wind speed in September: 10.5mph

The windiest month (with the highest average wind speed) is April (13.4mph).
The calmest month (with the lowest average wind speed) is August (9.7mph).

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Average humidity in September
Chester, OK

Average humidity in September - Chester, OK
  • Average humidity in September: 60%

The month with the highest relative humidity is May (64%).
The month with the lowest relative humidity is July (53%).

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Average rainfall in September
Chester, OK

Average rainfall in September - Chester, OK
  • Average rainfall in September: 1.34"

The wettest month (with the highest rainfall) is May (2.44").
The driest month (with the least rainfall) is January (0.47").

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Average rainfall days in September
Chester, OK

Average rainfall days in September - Chester, OK
  • Average rainfall days in September: 11.2 days

The month with the highest number of rainy days is May (11.6 days).
The month with the least rainy days is December (2.9 days).

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Average snowfall in September
Chester, OK

Average snowfall in September - Chester, OK
  • Average snowfall in September: 0"

The month with the highest snowfall is February (1.54").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in September
Chester, OK

Average snowfall days in September - Chester, OK
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (2.5 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
Chester, OK

Average daylight in September / Average sunshine in September - Chester, OK
  • Average daylight in September: 12h and 2min

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

  • Average sunshine in September: 8h and 5min

The month with the most sunshine is July (Average sunshine: 11h and 12min).
The month with the least sunshine is December (Average sunshine: 6h and 24min).

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Average sunshine days in September
Chester, OK

Average sunshine days in September - Chester, OK
  • Average sunshine days in September: 16.8 days

The month with the most sunshine days is January (26.4 days).
The month with the least sunshine days is September (16.8 days).

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Average UV index in September
Chester, OK

Average UV index in September - Chester, OK
  • Average UV index in September: 5

The months with the highest UV index are June, July and August (UV index 7).
The month with the lowest UV index is December (UV index 2).

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Average cloud cover in September
Chester, OK

Average cloud cover in September - Chester, OK
  • Average cloud cover in September: 25

The month with the most cloud cover is April (Cloud cover 34).
The months with the least cloud cover are June and August (Cloud cover 19).

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Average visibility in September
Chester, OK

Average visibility in September - Chester, OK
  • 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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Chester, Oklahoma, USA

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