September weather forecastDurham, OK
September
Weather in September
September, the first month of the autumn in Durham, is also a moderately hot month, with an average temperature varying between 64.4°F (18°C) and 83.8°F (28.8°C).Temperature
September's arrival coincides with a soft drop in the average high-temperature, subtly decreasing from August's hot 92.3°F (33.5°C) to a moderately hot 83.8°F (28.8°C). Throughout September, an average low-temperature of 64.4°F (18°C) is expected.Heat index
The heat index value during September is computed to be a hot 86°F (30°C). Exposure and extended activity could potentially cause a state of fatigue and lead to heat cramps.It is important to note that the heat index values are for shaded areas and light wind scenarios. With direct sunlight, the heat index could increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'real feel', comes about by integrating the temperature readings with the humidity levels. Factors such as metabolic variation, pregnancy, and physical activity play a role in one's impression of weather. Direct sun rays can make one feel hotter, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are primarily vital for children. Youngsters often neglect the necessity for rest and hydration. Thirst is a sign of advancing dehydration - thus the importance of maintaining hydration, specifically during long-lasting physical activities.
Humidity
In Durham, the average relative humidity in September is 55%.Rainfall
In Durham, in September, during 9.6 rainfall days, 1.26" (32mm) of precipitation is typically accumulated. Throughout the year, there are 89.4 rainfall days, and 15.24" (387mm) of precipitation is accumulated.Snowfall
May through September are months without snowfall.Daylight
The average length of the day in September is 12h and 23min.On the first day of the month, sunrise is at 7:12 am and sunset at 8:06 pm. On the last day of September, sunrise is at 7:34 am and sunset at 7:24 pm CDT.
Sunshine
In September, the average sunshine is 9.3h.UV index
In September, the average daily maximum UV index in Durham is 5. A UV Index reading of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for average individuals.Note: The maximum daily UV index of 5 in September converts into the following recommendations:
Undertake protective steps - Obligation to safeguard skin and eyes from harm is in place. Considering the harmful UV rays from the Sun during midday, it's essential to reduce exposure. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Durham, OK
- Average high temperature in September: 83.8°F
The warmest month (with the highest average high temperature) is July (93.4°F).
The month with the lowest average high temperature is December (48.7°F).
- Average low temperature in September: 64.4°F
The month with the highest average low temperature is July (72.7°F).
The coldest month (with the lowest average low temperature) is January (30.7°F).
Average pressure in September
Durham, OK
- Average pressure in September: 29.97"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).
Average wind speed in September
Durham, OK
- Average wind speed in September: 11.8mph
The windiest month (with the highest average wind speed) is April (14.3mph).
The calmest months (with the lowest average wind speed) are January and August (10.7mph).
Average humidity in September
Durham, OK
- Average humidity in September: 55%
The month with the highest relative humidity is December (57%).
The month with the lowest relative humidity is July (49%).
Average rainfall in September
Durham, OK
- Average rainfall in September: 1.26"
The wettest month (with the highest rainfall) is May (2.17").
The driest month (with the least rainfall) is February (0.39").
Average rainfall days in September
Durham, OK
- Average rainfall days in September: 9.6 days
The months with the highest number of rainy days are July and August (12.2 days).
The month with the least rainy days is January (2.1 days).
Average snowfall in September
Durham, OK
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.34").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Durham, OK
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (2.8 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
Durham, 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: 9h and 18min
The months with the most sunshine are June and July (Average sunshine: 11h and 30min).
The month with the least sunshine is December (Average sunshine: 6h and 48min).
Average sunshine days in September
Durham, OK
- Average sunshine days in September: 17.7 days
The month with the most sunshine days is January (27 days).
The month with the least sunshine days is August (13.8 days).
Average UV index in September
Durham, OK
- Average UV index in September: 5
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
Durham, OK
- Average cloud cover in September: 21
The month with the most cloud cover is April (Cloud cover 27).
The months with the least cloud cover are June and August (Cloud cover 17).
Average visibility in September
Durham, 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).
