Oklahoma City
Oklahoma, USA
Long-term weather forecast
Long-term weather forecast

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

Temperature

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

Heat index

In September, the average heat index is evaluated at a tropical 90°F (32.2°C). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Note that heat index values are valued for light wind and location in the shade. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'real feel', 'feels like', or 'apparent temperature', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (clothing, pregnancy, metabolic differences). 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. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.

Humidity

In September, the average relative humidity is 65%.

Rainfall

In September, in Oklahoma City, the rain falls for 13.6 days. Throughout September, 2.83" (72mm) of precipitation is accumulated. Throughout the year, in Oklahoma City, there are 121 rainfall days, and 24.96" (634mm) of precipitation is accumulated.

Snowfall

May through October are months without snowfall in Oklahoma City.

Daylight

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

Sunshine

The average sunshine in September is 8.5h.

UV index

In September, the average daily maximum UV index in Oklahoma City is 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to the Sun's UV rays for the average person.
Note: In September, the average maximum UV index of 5 translate into the following recommendations:
Take precautions. Light skin individuals may get burned in less than 30 minutes. 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.

What is the temperature in September in Oklahoma City?

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

What is the average humidity in September in Oklahoma City?

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

How much does it rain in Oklahoma City in September?

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?

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

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

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 intensity in September in Oklahoma City?

The average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a medium hazard to health from unprotected exposure to the UV radiation.
Average temperature in September - Oklahoma City, OK
  • Average high temperature in September: 29.2°C

The warmest month (with the highest average high temperature) is July (34.2°C).
The month with the lowest average high temperature is January (9.2°C).

  • Average low temperature in September: 18.6°C

The month with the highest average low temperature is July (22.9°C).
The coldest month (with the lowest average low temperature) is January (-0.2°C).

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%).

Average rainfall in September - Oklahoma City, OK
  • Average rainfall in September: 72mm

The wettest month (with the highest rainfall) is May (104mm).
The driest month (with the lowest rainfall) is December (23mm).

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 lowest number of rainy days is January (4.5 days).

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

The month with the highest snowfall is February (32mm).
Months with the lowest snowfall are May, June, July, August, September and October (0mm).

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 lowest number of snowfall days are May, June, July, August and September (0 days).

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 shortest days is December (Average daylight: 9.8h).

  • Average sunshine in September: 8.5h

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

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).