September weather forecastSpiro, OK
September
Weather in September
The first month of the autumn, September, is also a moderately hot month in Spiro, Oklahoma, with temperature in the range of an average low of 63.5°F (17.5°C) and an average high of 85.1°F (29.5°C).Temperature
September is characterized by a mild reduction in the average high-temperature, from a tropical 92.1°F (33.4°C) in August to a warm 85.1°F (29.5°C). A sharp reduction from the daytime highs is witnessed during September, with nighttime temperatures averaging a low of 63.5°F (17.5°C).Heat index
In September, the average heat index is computed to be a hot 93.2°F (34°C). Heightened safety actions are necessary, heat cramps and heat exhaustion are probable. Persistent activity may lead to heatstroke.In terms of the heat index, values are set with light wind and shade conditions in mind. Direct sunlight might lead to a heat index increase by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. The influence of weather can be personal, changing with an individual's body mass, height, and level of physical exertion. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for children. Young kids are often more at risk than adults as they tend to perspire less. Besides, their skin surface is larger relative to their small bodies, and their increased heat output from their active lifestyle compounds their risk.
Humidity
In Spiro, the average relative humidity in September is 71%.Rainfall
In Spiro, during September, the rain falls for 11.4 days and regularly aggregates up to 2.72" (69mm) of precipitation. Throughout the year, there are 147.8 rainfall days, and 34.76" (883mm) of precipitation is accumulated.Snowfall
April through October are months without snowfall.Daylight
In Spiro, the average length of the day in September is 12h and 23min.On the first day of the month, sunrise is at 6:51 am and sunset at 7:44 pm. On the last day of September, sunrise is at 7:13 am and sunset at 7:03 pm CDT.
Sunshine
In Spiro, the average sunshine in September is 9.5h.UV index
In September, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for the ordinary person.Note: The UV index of 5 during September leads to these advisories:
Exercise caution. Those with pale skin may experience burns in less than half an hour. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Spiro, OK
- Average high temperature in September: 85.1°F
The warmest month (with the highest average high temperature) is July (93°F).
The month with the lowest average high temperature is January (48°F).
- Average low temperature in September: 63.5°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 (31.8°F).
Average pressure in September
Spiro, OK
- Average pressure in September: 30"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Spiro, OK
- Average wind speed in September: 5.4mph
The windiest month (with the highest average wind speed) is April (8.1mph).
The calmest months (with the lowest average wind speed) are July and August (5mph).
Average humidity in September
Spiro, OK
- Average humidity in September: 71%
The month with the highest relative humidity is May (77%).
The month with the lowest relative humidity is August (69%).
Average rainfall in September
Spiro, OK
- Average rainfall in September: 2.72"
The wettest month (with the highest rainfall) is May (4.45").
The driest months (with the least rainfall) are January and February (2.17").
Average rainfall days in September
Spiro, OK
- Average rainfall days in September: 11.4 days
The month with the highest number of rainy days is March (15.6 days).
The month with the least rainy days is November (8.9 days).
Average snowfall in September
Spiro, OK
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.1").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Spiro, OK
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (2.1 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Spiro, OK
- Average daylight in September: 12h and 24min
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: 9h and 30min
The months with the most sunshine are July and August (Average sunshine: 10h and 54min).
The month with the least sunshine is January (Average sunshine: 5h and 30min).
Average sunshine days in September
Spiro, OK
- Average sunshine days in September: 16.8 days
The month with the most sunshine days is January (19.6 days).
The month with the least sunshine days is May (13.4 days).
Average UV index in September
Spiro, OK
- Average UV index in September: 5
The months with the highest UV index are June and July (UV index 7).
The month with the lowest UV index is December (UV index 2).
Average cloud cover in September
Spiro, OK
- Average cloud cover in September: 26
The month with the most cloud cover is February (Cloud cover 44).
The month with the least cloud cover is August (Cloud cover 23).
Average visibility in September
Spiro, 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).
