September weather forecast
Fairfield, OK

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Weather in September

The first month of the autumn, September, is also a moderately hot month in Fairfield, Oklahoma, with an average temperature fluctuating between 82.6°F (28.1°C) and 62.6°F (17°C).

Temperature

September's arrival coincides with a soft drop in the average high-temperature, subtly decreasing from August's hot 89.6°F (32°C) to a warm 82.6°F (28.1°C). During the month of September, the temperature in Fairfield generally drops to a low average of 62.6°F (17°C).

Heat index

In September, the average 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.
When referencing the heat index, its values are suitable for shady environments and light breezes. Heat index values can rise by 15 Fahrenheit (8 Celsius) degrees when in direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', quantifies the warmth felt when relative humidity is considered. The effect is personal, with varied weather perceptions among individuals due to differences in body mass, stature, and physical activity. Realize that direct exposure to sunlight can augment the felt heat, leading to a potential increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are of high significance for children. Children often overlook the necessity for resting and fluid replenishment. Thirst is a late sign of dehydration - thus, it is critical to stay hydrated, especially during extended periods of physical activities.

Humidity

In September, the average relative humidity is 72%.

Rainfall

In Fairfield, Oklahoma, in September, it is raining for 12.6 days, with typically 2.76" (70mm) of accumulated precipitation. In Fairfield, during the entire year, the rain falls for 151.2 days and collects up to 34.76" (883mm) of precipitation.

Snowfall

June through October are months without snowfall in Fairfield.

Daylight

The average length of the day in September is 12h and 23min.
On the first day of September in Fairfield, Oklahoma, sunrise is at 6:50 am and sunset at 7:45 pm. On the last day of the month, sunrise is at 7:13 am and sunset at 7:03 pm CDT.

Sunshine

In September, the average sunshine is 9.5h.

UV index

In Fairfield, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for ordinary individuals.
Note: The maximum daily UV index, 5 in September, converts into the following recommendations:
Take heed. Individuals of lighter complexion can be burned in less than half an hour. To protect against the Sun's most potent rays, avoid direct exposure around midday. Employ a hat with a wide brim for robust protection, cutting UV exposure by half.
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Frequently asked questions

How hot is it in Fairfield in September?

Fairfield in September has an average high-temperature of 82.6°F (28.1°C) and an average low-temperature of 62.6°F (17°C). In September, the average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which combines air temperature and relative humidity, is computed to be 87.8°F (31°C).

What is the average humidity in September in Fairfield?

The average relative humidity in September in Fairfield, Oklahoma, is 72%.

How much does it rain in Fairfield in September?

In Fairfield, Oklahoma, in September, during 12.6 rainfall days, 2.76" (70mm) of precipitation is typically accumulated.

When it does not snow in Fairfield?

In Fairfield, Oklahoma, snow does not fall in June through October.

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

The average day length in September in Fairfield is 12h and 23min.

When is the sunrise / sunset in September in Fairfield?

In September, on the first day of the month, sunrise is at 6:50 am and sunset at 7:45 pm. On the last day of the month, in Fairfield, Oklahoma, sunrise is at 7:13 am and sunset at 7:03 pm CDT.

How long on average sun shines in September in Fairfield?

The average sunshine duration in September is 9.5h.

How high is the UV index in September in Fairfield?

The average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from exposure to the Sun's 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
Fairfield, OK

Average temperature in September - Fairfield, OK
  • Average high temperature in September: 82.6°F

The warmest month (with the highest average high temperature) is July (91°F).
The month with the lowest average high temperature is January (45.9°F).

  • Average low temperature in September: 62.6°F

The month with the highest average low temperature is July (70.2°F).
The coldest month (with the lowest average low temperature) is January (29.8°F).

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Average pressure in September
Fairfield, OK

Average pressure in September - Fairfield, OK
  • Average pressure in September: 30.01"Hg

The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

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Average wind speed in September
Fairfield, OK

Average wind speed in September - Fairfield, OK
  • Average wind speed in September: 6.5mph

The windiest month (with the highest average wind speed) is April (9.4mph).
The calmest month (with the lowest average wind speed) is July (5.8mph).

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Average humidity in September
Fairfield, OK

Average humidity in September - Fairfield, OK
  • Average humidity in September: 72%

The month with the highest relative humidity is May (78%).
The month with the lowest relative humidity is August (70%).

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Average rainfall in September
Fairfield, OK

Average rainfall in September - Fairfield, OK
  • Average rainfall in September: 2.76"

The wettest month (with the highest rainfall) is May (4.06").
The driest month (with the least rainfall) is February (1.97").

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Average rainfall days in September
Fairfield, OK

Average rainfall days in September - Fairfield, OK
  • Average rainfall days in September: 12.6 days

The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is January (8.2 days).

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Average snowfall in September
Fairfield, OK

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

The month with the highest snowfall is February (1.46").
The months with the least snowfall are June, July, August, September and October (0").

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Average snowfall days in September
Fairfield, OK

Average snowfall days in September - Fairfield, 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 June, July, August, September and October (0 days).

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Average daylight in September /
Average sunshine in September
Fairfield, OK

Average daylight in September / Average sunshine in September - Fairfield, 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 48min).

  • Average sunshine in September: 9h and 3min

The months with the most sunshine are July and August (Average sunshine: 10h and 48min).
The months with the least sunshine are January and December (Average sunshine: 5h and 30min).

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Average sunshine days in September
Fairfield, OK

Average sunshine days in September - Fairfield, OK
  • Average sunshine days in September: 14.9 days

The month with the most sunshine days is January (19.7 days).
The month with the least sunshine days is May (11.6 days).

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Average UV index in September
Fairfield, OK

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

The months with the highest UV index are June and July (UV index 7).
The months with the lowest UV index are February and December (UV index 2).

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Average cloud cover in September
Fairfield, OK

Average cloud cover in September - Fairfield, OK
  • Average cloud cover in September: 27

The months with the most cloud cover are February and March (Cloud cover 44).
The month with the least cloud cover is August (Cloud cover 23).

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Average visibility in September
Fairfield, OK

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

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