September weather forecast and climate
Oklahoma City, OK

The State Capitol Building, Oklahoma City, Oklahoma, with flags and a statue outside
The State Capitol Building, Oklahoma City, Oklahoma, with flags and a statue outside

Weather in September

September, the first month of the autumn, in Oklahoma City, is also a moderately hot month, with average temperature ranging between max 84.6°F (29.2°C) and min 65.5°F (18.6°C).

Temperature

In September, the average high-temperature marginally drops, from a tropical 92.8°F (33.8°C) in August, to a warm 84.6°F (29.2°C). In September, in Oklahoma City, the average low-temperature is 65.5°F (18.6°C).

Heat index

The average heat index is calculated to a tropical 90°F (32.2°C). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
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 'feels like', 'apparent temperature', 'real feel', or 'felt air temperature', combines air temperature and relative humidity to represent a human perceived temperature equivalent. This effect is individual, with diverse people perceiving weather differently for numerous reasons (metabolic differences, wind, pregnancy), and activity. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. 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

In Oklahoma City, Oklahoma, the average relative humidity is 65%.

Rainfall

In Oklahoma City, Oklahoma, during September, the rain falls for 13.6 days and regularly aggregates up to 2.83" (72mm) of precipitation. In Oklahoma City, during the entire year, the rain falls for 121 days and collects up to 24.96" (634mm) of precipitation.

Snowfall

In Oklahoma City snow does not fall in May through October.

Daylight

In Oklahoma City, the average length of the day in September is 12.4h.

Sunshine

In September, the average sunshine is 8.5h.

UV index

In Oklahoma City, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to the UV radiation for ordinary individuals.
Note: In September, the average maximum UV index of 5 translate into the following recommendations:
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. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the temperature in September in Oklahoma City?

In Oklahoma City, in September, the average high-temperature is 84.6°F (29.2°C), and the average low-temperature is 65.5°F (18.6°C). In September, the average heat index (a.k.a. 'feels like', 'felt air temperature'), that calculates temperature value influenced by the moisture in the air, is appraised at 90°F (32.2°C).

What is the average humidity in September in Oklahoma City?

The average relative humidity in September in Oklahoma City, Oklahoma, is 65%.

How many days does it rain in September in Oklahoma City?

In Oklahoma City, in September, during 13.6 rainfall days, 2.83" (72mm) of precipitation is typically accumulated.

When it does not snow in Oklahoma City?

May through October are months without snowfall.

What is the average length of the day in September in Oklahoma City?

The average length of the day in September is 12.4h.

How many hours of sunshine does Oklahoma City have in September?

The average sunshine in September in Oklahoma City, Oklahoma, is 8.5h.

What is the UV index reading in September in Oklahoma City?

In Oklahoma City, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate health threat from the exposure to the Sun's UV radiation.

Average temperature in September
Oklahoma City, OK

Average temperature in September - Oklahoma City, OK
  • Average high temperature in September: 84.6°F

The warmest month (with the highest average high temperature) is July (93.6°F).
The month with the lowest average high temperature is January (48.6°F).

  • Average low temperature in September: 65.5°F

The month with the highest average low temperature is July (73.2°F).
The coldest month (with the lowest average low temperature) is January (31.6°F).

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Average pressure in September
Oklahoma City, OK

Average pressure in September - Oklahoma City, OK
  • Average pressure in September: 29.97"

The month with the highest atmospheric pressure is January (30.16").
The month with the lowest atmospheric pressure is June (29.87").

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Average wind speed in September
Oklahoma City, OK

Average wind speed in September - Oklahoma City, OK
  • Average wind speed in September: 8.9mph

The windiest month (with the highest average wind speed) is April (12.3mph).
The calmest month (with the lowest average wind speed) is August (8.6mph).

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Average humidity in September
Oklahoma City, OK

Average humidity in September - Oklahoma City, OK
  • Average humidity in September: 65%

The month with the highest relative humidity is May (73%).
The month with the lowest relative humidity is August (60%).

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Average rainfall in September
Oklahoma City, OK

Average rainfall in September - Oklahoma City, OK
  • Average rainfall in September: 2.83"

The wettest month (with the highest rainfall) is May (4.09").
The driest month (with the least rainfall) is December (0.91").

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Average rainfall days in September
Oklahoma City, OK

Average rainfall days in September - Oklahoma City, OK
  • Average rainfall days in September: 13.6 days

The month with the highest number of rainy days is May (14.5 days).
The month with the least rainy days is January (4.5 days).

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Average snowfall in September
Oklahoma City, OK

Average snowfall in September - Oklahoma City, OK
  • Average snowfall in September: 0"

The month with the highest snowfall is February (1.26").
Months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in September
Oklahoma City, OK

Average snowfall days in September - Oklahoma City, OK
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (3 days).
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
Oklahoma City, OK

Average daylight in September / Average sunshine in September - Oklahoma City, OK
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.5h).
The month with the shortest days is December (Average daylight: 9.8h).

  • Average sunshine in September: 8.5h

Months with the most sunshine are July and August (Average sunshine: 11h).
The month with the least sunshine is December (Average sunshine: 6h).

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Average sunshine days in September
Oklahoma City, OK

Average sunshine days in September - Oklahoma City, OK
  • Average sunshine days in September: 14.1 days

The month with the most sunshine days is January (24.4 days).
The month with the least sunshine days is May (13.9 days).

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Average UV index in September
Oklahoma City, OK

Average UV index in September - Oklahoma City, OK
  • Average UV index in September: 5

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
Oklahoma City, OK

Average cloud cover in September - Oklahoma City, OK
  • Average cloud cover in September: 27

The month with the most cloud cover is March (Cloud cover 38).
The month with the least cloud cover is August (Cloud cover 20).

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Average visibility in September
Oklahoma City, OK

Average visibility in September - Oklahoma City, OK
  • Average visibility in September: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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