September weather forecastBristow, OK
September
Weather in September
September brings the onset of autumn to Bristow with temperatures dropping to an average high of 83.7°F (28.7°C), a significant decline from the peak summer months. It does see a higher level of rainfall compared to the summer months, but nowhere near the rainfall levels of Spring. As fall settles in, the number of daylight hours declines gradually from the highs observed in summer. The absence of snowfall is expected as September is still a relatively warm month. Wind speeds vary slightly during this transition period but do not indicate drastic changes in weather conditions.Temperature
September's onset introduces a mild reduction in the average high-temperature, from a hot 90.9°F (32.7°C) in August to a moderately hot 83.7°F (28.7°C). Throughout September nights, Bristow registers an average low-temperature of 64.2°F (17.9°C).Heat index
In September, the heat index is calculated to be a tropical 89.6°F (32°C). If one endures exposure and continues to be active, it might result in tiredness and heat cramps.It is worth noting that heat index values are gauged for conditions in the shade and light breezes. If exposed to direct sunlight, the heat index could climb by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'apparent temperature', shows a temperature sensation when both heat and moisture conditions are combined. An individual's temperature experience can be influenced by extra factors, including metabolic differences, activity levels, and clothing. Under direct sun rays, the felt temperature might be heightened, with the heat index increasing by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical to babies and toddlers. Young ones generally face higher dangers than adults since they sweat less. Along with their large skin surface area compared totheir small bodies and increased heat production from their activities, the risks are heightened.
Humidity
In Bristow, the average relative humidity in September is 69%.Rainfall
In Bristow, in September, it is raining for 11.8 days, with typically 3.11" (79mm) of accumulated precipitation. Throughout the year, there are 127.9 rainfall days, and 27.76" (705mm) of precipitation is accumulated.Snowfall
In Bristow, snow does not fall in April through October.Daylight
In September, the average length of the day is 12h and 23min.On the first day of September, sunrise is at 6:58 am and sunset at 7:52 pm. On the last day of the month, sunrise is at 7:20 am and sunset at 7:10 pm CDT.
Sunshine
The average sunshine in September is 8.6h.UV index
In September, the average daily maximum UV index is 5. A UV Index reading of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.Note: In September, the maximum UV index of 5 suggests this advice:
Act with care - Obligation to protect against skin and eye damage is highlighted. Solar radiation is at its peak intensity during midday, so it's advisable to stay indoors or in the shade. Experience reduced UV exposure by about half when donning a wide-brim hat.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Bristow, OK
- Average high temperature in September: 83.7°F
The warmest month (with the highest average high temperature) is July (91.6°F).
The month with the lowest average high temperature is January (47.1°F).
- Average low temperature in September: 64.2°F
The month with the highest average low temperature is July (72.3°F).
The coldest month (with the lowest average low temperature) is January (31.5°F).
Average pressure in September
Bristow, 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 (29.89"Hg).
Average wind speed in September
Bristow, OK
- Average wind speed in September: 7.7mph
The windiest months (with the highest average wind speed) are March and April (11mph).
The calmest month (with the lowest average wind speed) is July (7.4mph).
Average humidity in September
Bristow, OK
- Average humidity in September: 69%
The month with the highest relative humidity is May (80%).
The months with the lowest relative humidity are January and August (66%).
Average rainfall in September
Bristow, OK
- Average rainfall in September: 3.11"
The wettest month (with the highest rainfall) is May (4.57").
The driest month (with the least rainfall) is January (1.18").
Average rainfall days in September
Bristow, OK
- Average rainfall days in September: 11.8 days
The month with the highest number of rainy days is May (16.3 days).
The month with the least rainy days is January (5.8 days).
Average snowfall in September
Bristow, OK
- Average snowfall in September: 0"
The month with the highest snowfall is February (2.01").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Bristow, OK
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (2.6 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
Bristow, OK
- Average daylight in September: 12h and 24min
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 48min).
- Average sunshine in September: 8h and 36min
The month with the most sunshine is August (Average sunshine: 11h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 48min).
Average sunshine days in September
Bristow, OK
- Average sunshine days in September: 16.4 days
The month with the most sunshine days is January (22.3 days).
The month with the least sunshine days is May (13.3 days).
Average UV index in September
Bristow, 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
Bristow, OK
- Average cloud cover in September: 28
The month with the most cloud cover is March (Cloud cover 39).
The month with the least cloud cover is August (Cloud cover 20).
Average visibility in September
Bristow, 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).
