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
September's arrival subtly correlates with a reduction in the average high-temperature, down from a tropical 91.9°F (33.3°C) in August to a warm 84.4°F (29.1°C). The average low-temperature during September nights is an enjoyable 63°F (17.2°C).Heat index
In September, the heat index is calculated to be a hot 86°F (30°C). Persisting in activity during long-term exposure might induce weariness, with subsequent heat cramps.Heat index details are generally centered around shaded locations and a mild breeze. Direct sunlight exposure may cause a 15 Fahrenheit (8 Celsius) degrees rise in the heat index.
Note: The heat index, also known as 'felt air temperature' or 'real feel', is an amalgamation of air temperature and humidity to express the equivalent perceived temperature. This effect tends to be personal, with the weather perception differing among individuals due to variations in body mass, height, and exertion. It is important to note that direct sunlight can intensify the weather impact, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for children. Kids are usually more vulnerable than adults, given their lesser sweating ability. Along with their larger skin surface relative to their small stature and the excess heat due to their activity, their risk is amplified.
Humidity
In September, the average relative humidity is 50%.Rainfall
In September, the rain falls for 9.9 days. Throughout September, 1.02" (26mm) of precipitation is accumulated. In Optima, during the entire year, the rain falls for 88.2 days and collects up to 13.39" (340mm) of precipitation.Snowfall
May through September are months without snowfall.Daylight
In September, the average length of the day is 12h and 24min.On the first day of the month, sunrise is at 7:17 am and sunset at 8:13 pm. On the last day of September, sunrise is at 7:40 am and sunset at 7:29 pm CDT.
Sunshine
The average sunshine in September in Optima is 9.3h.UV index
In September, the average daily maximum UV index is 6. A UV Index estimate of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV radiation for the ordinary person.Note: The daily maximum UV index of 6 in September interprets into the following advice:
Beware of overexposure. Fair-skinned individuals risk burning in less than 20 minutes. Stay out of direct sunlight and seek shade between 10 a.m. and 4 p.m., when UV radiation is strongest, but remember that shade devices may not offer full sun protection. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot is September?
What is the average humidity in September?
How many days does it rain in September?
When it does not snow?
Does it snow in September?
What is the average length of the day in September?
What time are sunrise and sunset in September?
How many hours of sunshine does Optima have in September?
What is the UV index reading in September?
Average temperature in September
Optima, OK
- Average high temperature in September: 84.4°F
The warmest month (with the highest average high temperature) is July (94.5°F).
The month with the lowest average high temperature is December (47.7°F).
- Average low temperature in September: 63°F
The month with the highest average low temperature is July (72.1°F).
The coldest months (with the lowest average low temperature) are January and December (28.9°F).
Average pressure in September
Optima, OK
- Average pressure in September: 29.94"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.81"Hg).
Average wind speed in September
Optima, OK
- Average wind speed in September: 12.1mph
The windiest month (with the highest average wind speed) is June (13.4mph).
The calmest month (with the lowest average wind speed) is January (10.6mph).
Average humidity in September
Optima, OK
- Average humidity in September: 50%
The month with the highest relative humidity is December (56%).
The month with the lowest relative humidity is June (44%).
Average rainfall in September
Optima, OK
- Average rainfall in September: 1.02"
The wettest month (with the highest rainfall) is July (2.01").
The driest month (with the least rainfall) is November (0.35").
Average rainfall days in September
Optima, OK
- Average rainfall days in September: 9.9 days
The month with the highest number of rainy days is July (13.5 days).
The month with the least rainy days is November (2.5 days).
Average snowfall in September
Optima, OK
- Average snowfall in September: 0"
The month with the highest snowfall is January (1.85").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Optima, OK
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (4.8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Optima, OK
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 36min).
The month with the shortest days is December (Average daylight: 9h and 42min).
- Average sunshine in September: 9h and 2min
The month with the most sunshine is June (Average sunshine: 11h and 42min).
The month with the least sunshine is December (Average sunshine: 6h and 42min).
Average sunshine days in September
Optima, OK
- Average sunshine days in September: 17 days
The month with the most sunshine days is January (25.5 days).
The month with the least sunshine days is July (12.7 days).
Average UV index in September
Optima, 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
Optima, OK
- Average cloud cover in September: 18
The month with the most cloud cover is February (Cloud cover 26).
The month with the least cloud cover is June (Cloud cover 15).
Average visibility in September
Optima, 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).
Optima, Oklahoma, USA
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