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
In Wynona, entering September brings a subtle temperature decrement, reducing from August's hot 90.3°F (32.4°C) to a warm 83.3°F (28.5°C). Wynona sees an average low-temperature of 63.7°F (17.6°C) during September.Heat index
The heat index for September is computed to be a tropical 89.6°F (32°C). Ongoing activity coupled with exposure often results in weariness and could induce heat cramps.Take note of the fact that heat index values are based on shaded circumstances with light airflows. Heat index values can rise by 15 Fahrenheit (8 Celsius) degrees when in direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', marries air temperature and humidity to produce a value illustrating perceived warmth. This impact is subjective, influenced by the person's physical activity and individual heat perception, affected by factors including wind, attire, and metabolic differences. In direct sunlight, the heat's impact can be heightened, potentially leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular significance for children. Children often lack awareness of the importance of taking breaks and rehydrating. The feeling of thirst is a late indication of dehydration, so maintaining hydration, especially during long periods of physical activity, is critical.
Humidity
The average relative humidity in September in Wynona is 70%.Rainfall
In September, the rain falls for 11.9 days. Throughout September, 3.35" (85mm) of precipitation is accumulated. Throughout the year, in Wynona, there are 131.7 rainfall days, and 29.06" (738mm) of precipitation is accumulated.Snowfall
April through October are months without snowfall.Daylight
In Wynona, the average length of the day in September is 12h and 24min.On the first day of the month, sunrise is at 6:57 am and sunset at 7:52 pm. On the last day of September, sunrise is at 7:20 am and sunset at 7:09 pm CDT.
Sunshine
The average sunshine in September is 8.7h.UV index
In September, the average daily maximum UV index is 5. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for average individuals.Note: During September, 5 as the daily maximum UV index converts into the following advice:
Be vigilant - Suggestions to stave off sun damage are provided. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. Employ a wide-brim hat for potent defense against up to 50% of UV rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot does it get in September?
What is the average humidity in September?
How much does it rain in September?
When it does not snow?
How many hours of daylight does Wynona have in September?
What time are sunrise and sunset in September?
How long on average sun shines in September?
What is the UV index reading in September?
Average temperature in September
Wynona, OK
- Average high temperature in September: 83.3°F
The warmest month (with the highest average high temperature) is July (91.2°F).
The month with the lowest average high temperature is January (45.5°F).
- Average low temperature in September: 63.7°F
The month with the highest average low temperature is July (72°F).
The coldest month (with the lowest average low temperature) is January (30°F).
Average pressure in September
Wynona, 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 (29.88"Hg).
Average wind speed in September
Wynona, OK
- Average wind speed in September: 8mph
The windiest months (with the highest average wind speed) are March and April (11.1mph).
The calmest month (with the lowest average wind speed) is July (7.5mph).
Average humidity in September
Wynona, OK
- Average humidity in September: 70%
The month with the highest relative humidity is May (79%).
The months with the lowest relative humidity are January and October (66%).
Average rainfall in September
Wynona, OK
- Average rainfall in September: 3.35"
The wettest month (with the highest rainfall) is May (5.2").
The driest months (with the least rainfall) are January, November and December (1.1").
Average rainfall days in September
Wynona, OK
- Average rainfall days in September: 11.9 days
The month with the highest number of rainy days is May (15 days).
The month with the least rainy days is January (5.7 days).
Average snowfall in September
Wynona, OK
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.38").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Wynona, OK
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (2.5 days).
The months with the least snowfall days are April, May, June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Wynona, 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: 8h and 4min
The months with the most sunshine are July and August (Average sunshine: 10h and 54min).
The month with the least sunshine is December (Average sunshine: 5h and 48min).
Average sunshine days in September
Wynona, OK
- Average sunshine days in September: 16.4 days
The month with the most sunshine days is January (23 days).
The month with the least sunshine days is April (13.4 days).
Average UV index in September
Wynona, OK
- Average UV index in September: 5
The months with the highest UV index are June, July and August (UV index 7).
The months with the lowest UV index are January and December (UV index 2).
Average cloud cover in September
Wynona, OK
- Average cloud cover in September: 28
The month with the most cloud cover is March (Cloud cover 40).
The month with the least cloud cover is August (Cloud cover 22).
Average visibility in September
Wynona, 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).
Wynona, Oklahoma, USA
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