September weather forecastCopan, OK
September
Weather in September
September, the first month of the autumn in Copan, is also a moderately hot month, with an average temperature fluctuating between 62.6°F (17°C) and 81.9°F (27.7°C).Temperature
A minor decrease in the average high-temperature is observed during September, shifting from a hot 88.7°F (31.5°C) in August to a moderately hot 81.9°F (27.7°C). During the nights in September, the temperature averages to an enjoyable 62.6°F (17°C).Heat index
September's heat index is estimated at a tropical 86°F (30°C). Constant exposure and activity lead to possible fatigue. Prolonged exercise may result in heat cramps.Bear in mind that the heat index values are determined for shaded areas and light breezes. Direct sunlight has the potential to heighten heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'feels like', is the result of factoring in humidity to the air temperature, indicating perceived warmth. The influence of weather is personal, with varied individuals experiencing it differently due to differences in body mass, stature, and physical exertion levels. One should be aware that direct sunshine can amplify the perceived temperature, raising the heat index by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for babies and toddlers. Young people are generally more susceptible than adults because they perspire less. Furthermore, their proportionally larger skin surface to their petite bodies and the increased heat output from their actions add to the risk.
Humidity
In Copan, the average relative humidity in September is 71%.Rainfall
In Copan, in September, it is raining for 11.1 days, with typically 1.54" (39mm) of accumulated precipitation. In Copan, Oklahoma, during the entire year, the rain falls for 109.1 days and collects up to 17.4" (442mm) of precipitation.Snowfall
April through October are months without snowfall.Daylight
In Copan, the average length of the day in September is 12h and 24min.On the first day of September, 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
The average sunshine in September in Copan is 8.9h.UV index
The average daily maximum UV index in September 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: The daily maximum UV index of 5 in September interprets into the following advice:
Take heed. Individuals of lighter complexion can be burned in less than half an hour. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. Stay sun-safe with clothing that is both closely woven and worn loosely.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Copan, OK
- Average high temperature in September: 81.9°F
The warmest month (with the highest average high temperature) is July (90.1°F).
The month with the lowest average high temperature is January (44.4°F).
- Average low temperature in September: 62.6°F
The month with the highest average low temperature is July (71.1°F).
The coldest month (with the lowest average low temperature) is January (28.8°F).
Average pressure in September
Copan, 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 (29.88"Hg).
Average wind speed in September
Copan, OK
- Average wind speed in September: 8mph
The windiest month (with the highest average wind speed) is March (11mph).
The calmest months (with the lowest average wind speed) are July and August (7.3mph).
Average humidity in September
Copan, 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%).
Average rainfall in September
Copan, OK
- Average rainfall in September: 1.54"
The wettest month (with the highest rainfall) is May (3.15").
The driest month (with the least rainfall) is December (0.43").
Average rainfall days in September
Copan, OK
- Average rainfall days in September: 11.1 days
The month with the highest number of rainy days is May (13.8 days).
The month with the least rainy days is January (3.9 days).
Average snowfall in September
Copan, OK
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.35").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Copan, OK
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (2.3 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
Copan, OK
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 42min).
- Average sunshine in September: 8h and 54min
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).
Average sunshine days in September
Copan, OK
- Average sunshine days in September: 16.3 days
The month with the most sunshine days is January (25.7 days).
The month with the least sunshine days is May (15 days).
Average UV index in September
Copan, 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).
Average cloud cover in September
Copan, OK
- Average cloud cover in September: 27
The month with the most cloud cover is March (Cloud cover 40).
The months with the least cloud cover are July and August (Cloud cover 23).
Average visibility in September
Copan, 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).
