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 brings a slight decrease in temperature, down from a tropical 92.5°F (33.6°C) in August to a moderately hot 85.5°F (29.7°C). With a notable disparity from daily peak temperatures, the average low-temperature settles at a refreshing 63.3°F (17.4°C) throughout September.Heat index
In September, the average heat index is calculated to be a tropical 93.2°F (34°C). Implement additional safety measures to avoid heat cramps and heat exhaustion. Persistent activity might trigger heatstroke.Records show heat index calculations are tailored for shaded regions and mild winds. Direct sunshine exposure could raise heat index values by as much as 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', is a fusion of air temperature and moisture levels to demonstrate the sensation of heat. Factors such as metabolic variation, pregnancy, and physical activity play a role in one's impression of weather. Consider that direct sun exposure can intensify the felt heat, adding potentially 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are highly critical for babies and toddlers. Children typically face more danger than adults as their sweat production is usually lower. Additionally, the bigger skin surface compared to their small size and the increased heat due to their activeness exacerbate the risk.
Humidity
In September, the average relative humidity is 70%.Rainfall
In September, the rain falls for 11.7 days. Throughout September, 2.52" (64mm) of precipitation is accumulated. In Wister, during the entire year, the rain falls for 146.2 days and collects up to 33.62" (854mm) of precipitation.Snowfall
In Wister, snow does not fall in April through November.Daylight
In Wister, the average length of the day in September is 12h and 23min.On the first day of the month, sunrise is at 6:52 am and sunset at 7:45 pm. On the last day of September, sunrise is at 7:13 am and sunset at 7:03 pm CDT.
Sunshine
The average sunshine in September is 9.3h.UV index
In September, the average daily maximum UV index is 6. A UV Index reading of 6 to 7 represents a high health risk from unsafe exposure to UV radiation for average individuals.Note: The maximum UV index of 6 during September leads to these instructions:
Conform to measures and uphold sun safety traditions. Warding off skin and eye harm is necessary. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot is it 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 Wister have in September?
What time are sunrise and sunset in September?
How long on average sun shines in September?
What is the UV index intensity in September?
Average temperature in September
Wister, OK
- Average high temperature in September: 85.5°F
The warmest month (with the highest average high temperature) is July (93.2°F).
The month with the lowest average high temperature is January (49.1°F).
- Average low temperature in September: 63.3°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 (32.2°F).
Average pressure in September
Wister, 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
Wister, OK
- Average wind speed in September: 5.3mph
The windiest month (with the highest average wind speed) is April (8.1mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).
Average humidity in September
Wister, OK
- Average humidity in September: 70%
The months with the highest relative humidity are February, March and May (76%).
The month with the lowest relative humidity is August (69%).
Average rainfall in September
Wister, OK
- Average rainfall in September: 2.52"
The wettest month (with the highest rainfall) is May (4.13").
The driest month (with the least rainfall) is January (1.97").
Average rainfall days in September
Wister, OK
- Average rainfall days in September: 11.7 days
The month with the highest number of rainy days is August (14.9 days).
The month with the least rainy days is November (9 days).
Average snowfall in September
Wister, OK
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.14").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").
Average snowfall days in September
Wister, 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
Wister, OK
- Average daylight in September: 12h and 2min
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 54min).
- Average sunshine in September: 9h and 2min
The months with the most sunshine are July and August (Average sunshine: 10h and 36min).
The months with the least sunshine are January and December (Average sunshine: 5h and 24min).
Average sunshine days in September
Wister, OK
- Average sunshine days in September: 16.4 days
The month with the most sunshine days is November (19.5 days).
The month with the least sunshine days is July (13.2 days).
Average UV index in September
Wister, OK
- Average UV index in September: 6
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
Wister, OK
- Average cloud cover in September: 28
The month with the most cloud cover is February (Cloud cover 46).
The months with the least cloud cover are June and August (Cloud cover 25).
Average visibility in September
Wister, 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).
Wister, Oklahoma, USA
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