September weather forecast
Spencerville, OK

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Weather in September

The first month of the autumn, September, is still a hot month in Spencerville, Oklahoma, with an average temperature ranging between max 86.7°F (30.4°C) and min 66°F (18.9°C).

Temperature

The shift from August to September includes a small decrease in the average high-temperature, from 93.9°F (34.4°C) to a still hot 86.7°F (30.4°C). In the month of September, the nighttime temperature dips to a steady average of 66°F (18.9°C).

Heat index

In September, the heat index is estimated at a fiery hot 96.8°F (36°C). Undertake extra safety actions, heat cramps and heat exhaustion are expected. Heatstroke may result from lengthy activity.
Heat index readings emphasize conditions of light breezes and shaded spots. The presence of direct sunlight can raise the heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', stands as a testimony to how temperature and humidity combine to impact our sense of warmth. Elements of metabolic variation, physical activity, and clothing contribute to the effect of temperature on an individual. Do note, being directly under sun rays can amplify the heat you feel, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly meaningful 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.
In the face of high temperatures, the human body's reflex is to perspire, leveraging sweat evaporation for cooling. When relative humidity is on the rise, it curtails evaporation, thereby reducing the heat elimination from the body and causing the feeling of being excessively hot. When body heat isn't effectively managed, risks of dehydration and overheating amplify.

Humidity

In September, the average relative humidity is 68%.

Rainfall

In September, the rain falls for 12 days. Throughout September, 2.68" (68mm) of precipitation is accumulated. Throughout the year, there are 143.9 rainfall days, and 36.61" (930mm) of precipitation is accumulated.

Snowfall

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

Daylight

The average length of the day in September is 12h and 22min.
On the first day of September, sunrise is at 6:55 am and sunset at 7:46 pm. On the last day of the month, sunrise is at 7:15 am and sunset at 7:06 pm CDT.

Sunshine

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

UV index

The average daily maximum UV index in September is 6. A UV Index reading of 6 to 7 represents a high threat to health from exposure to the Sun's UV rays for the average person.
Note: In September, the maximum UV index of 6 translates into these guidelines:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. The Sun emits the most powerful UV radiation between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage.

Frequently asked questions

How hot is September?

In Spencerville, 86.7°F (30.4°C) is the average high-temperature and 66°F (18.9°C) is the average low-temperature during September. The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which combines air temperature and relative humidity, in September is estimated at 96.8°F (36°C).

What is the average humidity in September?

The average relative humidity in September is 68%.

How much does it rain in September?

In Spencerville, in September, it is raining for 12 days, with typically 2.68" (68mm) of accumulated precipitation.

When it does not snow?

April through October are months without snowfall.

How many hours of daylight does Spencerville have in September?

The average day length in September is 12h and 22min.

When is the sunrise / sunset in September?

In September, on the first day of the month, sunrise is at 6:55 am and sunset at 7:46 pm. On the last day of the month, sunrise is at 7:15 am and sunset at 7:06 pm CDT.

How long on average sun shines in September in Spencerville?

The average sunshine duration in September is 8.9h.

What is the UV index reading in September?

In Spencerville, the average daily maximum UV index in September is 6. A UV Index reading of 6 to 7 represents a high hazard to health 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
Spencerville, OK

Average temperature in September - Spencerville, OK
  • Average high temperature in September: 86.7°F

The warmest month (with the highest average high temperature) is August (93.9°F).
The month with the lowest average high temperature is January (51.4°F).

  • Average low temperature in September: 66°F

The month with the highest average low temperature is July (72.5°F).
The coldest month (with the lowest average low temperature) is January (35.2°F).

Average pressure in September
Spencerville, OK

Average pressure in September - Spencerville, 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 (29.91"Hg).

Average wind speed in September
Spencerville, OK

Average wind speed in September - Spencerville, OK
  • Average wind speed in September: 6.3mph

The windiest months (with the highest average wind speed) are March and April (8.8mph).
The calmest month (with the lowest average wind speed) is August (5.9mph).

Average humidity in September
Spencerville, OK

Average humidity in September - Spencerville, OK
  • Average humidity in September: 68%

The month with the highest relative humidity is May (79%).
The month with the lowest relative humidity is August (65%).

Average rainfall in September
Spencerville, OK

Average rainfall in September - Spencerville, OK
  • Average rainfall in September: 2.68"

The wettest month (with the highest rainfall) is May (4.8").
The driest month (with the least rainfall) is January (1.93").

Average rainfall days in September
Spencerville, OK

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

The months with the highest number of rainy days are March and May (14.6 days).
The month with the least rainy days is January (9.1 days).

Average snowfall in September
Spencerville, OK

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

The month with the highest snowfall is February (1.06").
The months with the least snowfall are April, May, June, July, August, September and October (0").

Average snowfall days in September
Spencerville, OK

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

The month with the highest number of snowfall days is February (1.4 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).

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

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

The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).

  • Average sunshine in September: 8h and 5min

The month with the most sunshine is August (Average sunshine: 10h and 54min).
The month with the least sunshine is December (Average sunshine: 5h and 12min).

Average sunshine days in September
Spencerville, OK

Average sunshine days in September - Spencerville, OK
  • Average sunshine days in September: 15.5 days

The month with the most sunshine days is January (19.6 days).
The month with the least sunshine days is May (14.5 days).

Average UV index in September
Spencerville, OK

Average UV index in September - Spencerville, OK
  • Average UV index in September: 6

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
Spencerville, OK

Average cloud cover in September - Spencerville, OK
  • Average cloud cover in September: 29

The month with the most cloud cover is February (Cloud cover 46).
The month with the least cloud cover is August (Cloud cover 24).

Average visibility in September
Spencerville, OK

Average visibility in September - Spencerville, 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).

Spencerville, Oklahoma, USA

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