September weather forecast
Jefferson, OK

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Weather in September

September, the first month of the autumn in Jefferson, is also a moderately hot month, with an average temperature fluctuating between 66.2°F (19°C) and 84.9°F (29.4°C).

Temperature

The transition into September is accompanied by a slight temperature decrease, with the average high-temperature shifting from a tropical 93.4°F (34.1°C) in August to a warm 84.9°F (29.4°C). In Jefferson, an average low-temperature of 66.2°F (19°C) is recorded during September nights.

Heat index

The heat index value during September is calculated to be a tropical 89.6°F (32°C). Uninterrupted exposure and activity might result in fatigue, potentially causing heat cramps.
Heat index data is primarily for areas with shade and subjected to light winds. Direct sunlight exposure may cause a 15 Fahrenheit (8 Celsius) degrees rise in the heat index.
Note: The heat index, also known as 'real feel' or 'felt air temperature', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. A person's impression of weather can be shaped by many aspects, among them metabolic variations, pregnancy, and levels of physical activity. Direct exposure to sun rays can potentially augment the heat sensation, elevating the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values remain especially vital for babies and toddlers. In general, younger individuals are at greater risk than adults because they tend to sweat less. Also, having a larger skin surface to body size ratio and greater heat production due to their active behavior contribute to this danger.

Humidity

The average relative humidity in September in Jefferson is 62%.

Rainfall

In Jefferson, during September, the rain falls for 13.1 days and regularly aggregates up to 2.24" (57mm) of precipitation. In Jefferson, Oklahoma, during the entire year, the rain falls for 115 days and collects up to 21.5" (546mm) of precipitation.

Snowfall

In Jefferson, 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 September, sunrise is at 7:02 am and sunset at 7:58 pm. On the last day of the month, sunrise is at 7:26 am and sunset at 7:15 pm CDT.

Sunshine

The average sunshine in September is 8.9h.

UV index

The average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for average individuals.
Note: An average UV index of 5 in September transforms into this advice:
Act with care - Obligation to protect against skin and eye damage is highlighted. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays.
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Frequently asked questions

How hot does it get in Jefferson in September?

During September, Jefferson experiences an average high-temperature of 84.9°F (29.4°C) and a low-temperature of 66.2°F (19°C). The average heat index (a.k.a. 'felt air temperature', 'feels like'), which factors the actual air temperature with the relative humidity, in September is calculated to be 89.6°F (32°C).

What is the average humidity in September in Jefferson?

In Jefferson, Oklahoma, the average relative humidity in September is 62%.

How much does it rain in Jefferson in September?

In Jefferson, during September, the rain falls for 13.1 days and regularly aggregates up to 2.24" (57mm) of precipitation.

When it does not snow in Jefferson?

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

Does it snow in Jefferson in September?

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

What is the average length of the day in September in Jefferson?

The average day length in September in Jefferson, Oklahoma, is 12h and 24min.

When is the sunrise / sunset in September in Jefferson?

On the first day of September in Jefferson, sunrise is at 7:02 am and sunset at 7:58 pm. On the last day of the month, sunrise is at 7:26 am and sunset at 7:15 pm CDT.

How long on average sun shines in September in Jefferson?

In Jefferson, the average sunshine duration in September is 8.9h.

How high is the UV index in September in Jefferson?

In Jefferson, Oklahoma, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate health threat 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
Jefferson, OK

Average temperature in September - Jefferson, OK
  • Average high temperature in September: 84.9°F

The warmest month (with the highest average high temperature) is July (95°F).
The month with the lowest average high temperature is January (47.1°F).

  • Average low temperature in September: 66.2°F

The month with the highest average low temperature is July (74.8°F).
The coldest month (with the lowest average low temperature) is January (29.5°F).

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Average pressure in September
Jefferson, OK

Average pressure in September - Jefferson, 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
Jefferson, OK

Average wind speed in September - Jefferson, OK
  • Average wind speed in September: 9.1mph

The windiest month (with the highest average wind speed) is April (11.7mph).
The calmest month (with the lowest average wind speed) is August (8.5mph).

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Average humidity in September
Jefferson, OK

Average humidity in September - Jefferson, OK
  • Average humidity in September: 62%

The month with the highest relative humidity is May (69%).
The months with the lowest relative humidity are July and August (56%).

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Average rainfall in September
Jefferson, OK

Average rainfall in September - Jefferson, OK
  • Average rainfall in September: 2.24"

The wettest month (with the highest rainfall) is May (4.09").
The driest month (with the least rainfall) is December (0.71").

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Average rainfall days in September
Jefferson, OK

Average rainfall days in September - Jefferson, OK
  • Average rainfall days in September: 13.1 days

The month with the highest number of rainy days is May (14.8 days).
The month with the least rainy days is January (4.3 days).

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Average snowfall in September
Jefferson, OK

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

The month with the highest snowfall is February (1.5").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in September
Jefferson, OK

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

The month with the highest number of snowfall days is February (3.3 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
Jefferson, OK

Average daylight in September / Average sunshine in September - Jefferson, 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 months with the most sunshine are June and July (Average sunshine: 11h and 12min).
The months with the least sunshine are November and December (Average sunshine: 6h and 18min).

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Average sunshine days in September
Jefferson, OK

Average sunshine days in September - Jefferson, OK
  • Average sunshine days in September: 14.6 days

The month with the most sunshine days is December (23.9 days).
The month with the least sunshine days is May (14.3 days).

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Average UV index in September
Jefferson, OK

Average UV index in September - Jefferson, 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
Jefferson, OK

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

The months with the most cloud cover are March and April (Cloud cover 35).
The months with the least cloud cover are June and August (Cloud cover 19).

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Average visibility in September
Jefferson, OK

Average visibility in September - Jefferson, 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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Jefferson, Oklahoma, USA

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