September weather forecast
Cromwell, OK

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Weather in September

The first month of the autumn, September, is also a moderately hot month in Cromwell, Oklahoma, with an average temperature fluctuating between 64.4°F (18°C) and 84.2°F (29°C).

Temperature

The transition to September results in a modest reduction in average high-temperature, moving from a tropical 91.8°F (33.2°C) in August to a moderately hot 84.2°F (29°C). Throughout September, Cromwell registers a consistent average low-temperature of 64.4°F (18°C).

Heat index

For September, the heat index is computed to be a hot 91.4°F (33°C). More protective measures are required - heat exhaustion and heat cramps are likely. Heatstroke may follow lengthy activity.
It is noted that heat index values are ascertained for locations in the shade and with gentle breezes. In the presence of direct sunshine, the heat index could be augmented by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'apparent temperature', comes about by integrating the temperature readings with the humidity levels. The effect is experienced differently by individuals, hinging on unique characteristics such as body mass, stature, and level of activity. One must note that being under the direct sun can escalate the heat's effects, with the heat index possibly rising by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Children frequently underestimate the necessity to rest and hydrate. Thirst is a late sign of dehydration - thus, it is vital to stay hydrated, particularly during lengthy physical exercises.

Humidity

The average relative humidity in September is 69%.

Rainfall

In Cromwell, during September, the rain falls for 12.8 days and regularly aggregates up to 2.72" (69mm) of precipitation. In Cromwell, during the entire year, the rain falls for 129.9 days and collects up to 29.06" (738mm) of precipitation.

Snowfall

January through April, September, November and December are months with snowfall. September is the first month it typically snows. Throughout September, in the average 0.1 snowfall days, it receives 0.04" (1mm) of snow. In Cromwell, during the entire year, snow falls for 7.4 days and aggregates up to 3.9" (99mm) of snow.

Daylight

In September, the average length of the day is 12h and 23min.
On the first day of September, sunrise is at 6:58 am and sunset at 7:52 pm. On the last day of the month, sunrise is at 7:20 am and sunset at 7:10 pm CDT.

Sunshine

In September, the average sunshine is 8.7h.

UV index

In September, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for the average person.
Note: The daily high UV index of 5 during September translates into the following recommendations:
Take precautions - Protection against sunburn is recommended. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection. Attention! Nearly twice the Sun's UV radiation can be reflected by snow.

Frequently asked questions

How hot does it get in September?

In Cromwell, in September, the average high-temperature is 84.2°F (29°C), and the average low-temperature is 64.4°F (18°C). In September, the average heat index (a.k.a. 'felt air temperature', 'real feel'), which takes the relative humidity and factors it into the air temperature reading, is computed to be 91.4°F (33°C).

What is the average humidity in September?

The average relative humidity in September is 69%.

How many days does it rain in September?

In Cromwell, in September, it is raining for 12.8 days, with typically 2.72" (69mm) of accumulated precipitation.

When does it start snowing in Cromwell?

September is the first month it typically snows. Throughout September, in the average 0.1 snowfall days, it receives 0.04" (1mm) of snow.

How many hours of daylight does Cromwell have in September?

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

When is the sunrise / sunset in September?

On the first day of September in Cromwell, sunrise is at 6:58 am and sunset at 7:52 pm. On the last day of the month, sunrise is at 7:20 am and sunset at 7:10 pm CDT.

How long on average sun shines in September?

The average sunshine duration in September in Cromwell is 8.7h.

How high is the UV index in September?

The average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate health threat from unprotected exposure to 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
Cromwell, OK

Average temperature in September - Cromwell, OK
  • Average high temperature in September: 84.2°F

The warmest months (with the highest average high temperature) are July and August (91.8°F).
The month with the lowest average high temperature is January (47.8°F).

  • Average low temperature in September: 64.4°F

The month with the highest average low temperature is July (72.3°F).
The coldest month (with the lowest average low temperature) is January (32°F).

Average pressure in September
Cromwell, OK

Average pressure in September - Cromwell, 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 (29.89"Hg).

Average wind speed in September
Cromwell, OK

Average wind speed in September - Cromwell, OK
  • Average wind speed in September: 7.6mph

The windiest months (with the highest average wind speed) are March and April (11mph).
The calmest months (with the lowest average wind speed) are July and August (7.4mph).

Average humidity in September
Cromwell, OK

Average humidity in September - Cromwell, OK
  • Average humidity in September: 69%

The month with the highest relative humidity is May (80%).
The month with the lowest relative humidity is August (65%).

Average rainfall in September
Cromwell, OK

Average rainfall in September - Cromwell, OK
  • Average rainfall in September: 2.72"

The wettest month (with the highest rainfall) is May (4.72").
The driest months (with the least rainfall) are February and November (1.38").

Average rainfall days in September
Cromwell, OK

Average rainfall days in September - Cromwell, OK
  • Average rainfall days in September: 12.8 days

The month with the highest number of rainy days is May (15.9 days).
The month with the least rainy days is January (6.3 days).

Average snowfall in September
Cromwell, OK

Average snowfall in September - Cromwell, OK
  • Average snowfall in September: 0.04"

The month with the highest snowfall is February (1.81").
The months with the least snowfall are May, June, July, August and October (0").

Average snowfall days in September
Cromwell, OK

Average snowfall days in September - Cromwell, OK
  • Average snowfall days in September: 0.1 days

The month with the highest number of snowfall days is February (2.9 days).
The months with the least snowfall days are May, June, July, August and October (0 days).

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

Average daylight in September / Average sunshine in September - Cromwell, OK
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 30min).
The month with the shortest days is December (Average daylight: 9h and 48min).

  • Average sunshine in September: 8h and 4min

The month with the most sunshine is August (Average sunshine: 11h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 42min).

Average sunshine days in September
Cromwell, OK

Average sunshine days in September - Cromwell, OK
  • Average sunshine days in September: 14.5 days

The month with the most sunshine days is January (22.4 days).
The month with the least sunshine days is May (13.2 days).

Average UV index in September
Cromwell, OK

Average UV index in September - Cromwell, 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).

Average cloud cover in September
Cromwell, OK

Average cloud cover in September - Cromwell, OK
  • Average cloud cover in September: 28

The month with the most cloud cover is March (Cloud cover 40).
The month with the least cloud cover is August (Cloud cover 20).

Average visibility in September
Cromwell, OK

Average visibility in September - Cromwell, 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).

Cromwell, Oklahoma, USA

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