Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
The onset of September entails a subtle temperature shift, as the average high-temperature eases from a tropical 88.7°F (31.5°C) in August to a warm 81.9°F (27.7°C). Copan records a mean low-temperature of 62.6°F (17°C) in September.Heat index
For September, the heat index is calculated to be a hot 86°F (30°C). Staying active during long-term exposure might result in a state of exhaustion and cause heat cramps.Note that heat index values are valued for light wind and location in the shade. Direct sunlight can cause a surge in the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', is an estimation of the warmth sensation when considering humidity levels. The impact of weather on an individual can be subjective, affected by the person's activity and heat perception, which can vary due to elements including wind, clothing, and metabolic differences. Take note that direct exposure to the sun can increase the felt temperature, possibly adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are highly critical for babies and toddlers. 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
The average relative humidity in September in Copan is 71%.Rainfall
In Copan, Oklahoma, during September, the rain falls for 11.1 days and regularly aggregates up to 1.54" (39mm) of precipitation. Throughout the year, in Copan, Oklahoma, there are 109.1 rainfall days, and 17.4" (442mm) of precipitation is accumulated.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 in Copan, 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 Copan, Oklahoma, the average sunshine in September 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 medium vulnerability from unprotected exposure to Sun's UV rays for average individuals.Note: The UV index of 5 during September translates into the following guidance:
Stay alert. Light-skinned people could suffer burns in less than 30 minutes. It's recommended to limit sun exposure when its radiation is at its peak during midday. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly.
Frequently asked questions
What is the average September temperature in Copan?
What is the average humidity in September in Copan?
How much does it rain in Copan in September?
When it does not snow in Copan?
What is the average length of the day in September in Copan?
What time are sunrise and sunset in September in Copan?
How long on average sun shines in September in Copan?
What is the UV index reading in September in Copan?
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 2min
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 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).
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).
Copan, Oklahoma, USA
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