September weather forecast
Bartlesville, OK

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Weather in September

September marks the retreat of summer, with hints of Fall peeping through in Bartlesville. The average temperature begins to decline, indicating an impending shift towards the cooler months. While rainfall remains normatively average at 2.83" (72mm), this month steps back from the elevated summer figures. The decline in the UV index to 5 signals the quiet farewell to the summer season. Efforts to remain hydrated become less strenuous as drops in humidity are registered.

Temperature

September's arrival signals a moderate reduction in the average high-temperature, easing from a hot 88.9°F (31.6°C) in August to a warm 82°F (27.8°C). During September, Bartlesville's temperature falls to a steady low-temperature average of 62.8°F (17.1°C).

Heat index

September's average heat index is evaluated at a tropical 86°F (30°C). When exposure and activity are sustained, they could induce fatigue, with a chance of heat cramps.
Heat index specifics point out values are for conditions of shade and a slight breeze. Heat index values may rise by up to 15 Fahrenheit (8 Celsius) degrees when exposed to direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'real feel', quantifies the warmth felt when relative humidity is considered. An individual's perception of weather can be influenced by a variety of factors including metabolic differences, being pregnant, and their degree of physical exertion. Direct sun rays have a notable impact on perceived temperature, which can raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical to babies and toddlers. Kids generally face higher risks than adults as they sweat less. Along with their large skin surface compared to their small bodies and higher heat production due to their activities, their vulnerability is increased.

Humidity

In Bartlesville, Oklahoma, the average relative humidity in September is 71%.

Rainfall

In Bartlesville, in September, during 12 rainfall days, 2.83" (72mm) of precipitation is typically accumulated. In Bartlesville, during the entire year, the rain falls for 131.6 days and collects up to 29.06" (738mm) of precipitation.

Snowfall

In Bartlesville, snow does not fall in April through October.

Daylight

In September, the average length of the day is 12h and 24min.
On the first day of September in Bartlesville, Oklahoma, sunrise is at 6:55 am and sunset at 7:51 pm. On the last day of the month, sunrise is at 7:18 am and sunset at 7:08 pm CDT.

Sunshine

In Bartlesville, the average sunshine in September is 8.9h.

UV index

In September, the average daily maximum UV index in Bartlesville is 5. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for ordinary individuals.
Note: A maximum high daily UV index of 5 during September translates into the following directions:
Heed the precautions - Protecting the skin and eyes from damage is compulsory. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses.
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Frequently asked questions

What is the usual temperature for Bartlesville in September?

The high-temperature, in September, in Bartlesville, is 82°F (27.8°C), while the low-temperature averages to 62.8°F (17.1°C). In September, the average heat index (a.k.a. 'real feel', 'felt air temperature'), which takes the relative humidity and factors it into the air temperature reading, is evaluated at 86°F (30°C).

What is the average humidity in September in Bartlesville?

The average relative humidity in September in Bartlesville, Oklahoma, is 71%.

How much does it rain in Bartlesville in September?

In Bartlesville, in September, it is raining for 12 days, with typically 2.83" (72mm) of accumulated precipitation.

When it does not snow in Bartlesville?

April through October are months without snowfall.

How many hours of daylight does Bartlesville have in September?

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

When is the sunrise / sunset in September in Bartlesville?

In September, on the first day of the month, sunrise is at 6:55 am and sunset at 7:51 pm. On the last day of the month, in Bartlesville, Oklahoma, sunrise is at 7:18 am and sunset at 7:08 pm CDT.

How many hours of sunshine does Bartlesville have in September?

The average sunshine duration in September in Bartlesville is 8.9h.

How high is the UV index in September in Bartlesville?

The average daily maximum UV index in September in Bartlesville is 5. A UV Index of 3 to 5 symbolizes a medium health risk 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
Bartlesville, OK

Average temperature in September - Bartlesville, OK
  • Average high temperature in September: 82°F

The warmest month (with the highest average high temperature) is July (90.5°F).
The month with the lowest average high temperature is January (45.1°F).

  • Average low temperature in September: 62.8°F

The month with the highest average low temperature is July (71.2°F).
The coldest month (with the lowest average low temperature) is January (29.3°F).

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Average pressure in September
Bartlesville, OK

Average pressure in September - Bartlesville, OK
  • Average pressure in September: 29.99"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).

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Average wind speed in September
Bartlesville, OK

Average wind speed in September - Bartlesville, OK
  • Average wind speed in September: 7.8mph

The windiest month (with the highest average wind speed) is March (10.9mph).
The calmest month (with the lowest average wind speed) is July (7.1mph).

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Average humidity in September
Bartlesville, OK

Average humidity in September - Bartlesville, OK
  • Average humidity in September: 71%

The month with the highest relative humidity is May (80%).
The months with the lowest relative humidity are January, October and November (68%).

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Average rainfall in September
Bartlesville, OK

Average rainfall in September - Bartlesville, OK
  • Average rainfall in September: 2.83"

The wettest month (with the highest rainfall) is May (5.08").
The driest month (with the least rainfall) is November (1.02").

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Average rainfall days in September
Bartlesville, OK

Average rainfall days in September - Bartlesville, OK
  • Average rainfall days in September: 12 days

The month with the highest number of rainy days is May (15.6 days).
The month with the least rainy days is January (5.8 days).

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Average snowfall in September
Bartlesville, OK

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

The month with the highest snowfall is February (1.34").
The months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days in September
Bartlesville, OK

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

The month with the highest number of snowfall days is February (2.4 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).

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

Average daylight in September / Average sunshine in September - Bartlesville, 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: 10h and 54min).
The months with the least sunshine are January and December (Average sunshine: 5h and 48min).

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Average sunshine days in September
Bartlesville, OK

Average sunshine days in September - Bartlesville, OK
  • Average sunshine days in September: 15.9 days

The month with the most sunshine days is January (22.5 days).
The month with the least sunshine days is May (13.3 days).

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Average UV index in September
Bartlesville, OK

Average UV index in September - Bartlesville, 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 January and December (UV index 2).

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Average cloud cover in September
Bartlesville, OK

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

The month with the most cloud cover is March (Cloud cover 41).
The month with the least cloud cover is August (Cloud cover 22).

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Average visibility in September
Bartlesville, OK

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

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