September weather forecastKnobel, AR
September
Weather in September
The first month of the autumn, September, is still a warm month in Knobel, Arkansas, with an average temperature ranging between min 63°F (17.2°C) and max 81.9°F (27.7°C).Temperature
The arrival of September brings an average high-temperature of a warm 81.9°F (27.7°C), subtly diverging from August's 87.1°F (30.6°C). Knobel records an average nighttime low-temperature of 63°F (17.2°C) throughout September.Heat index
During September, the heat index is computed to be a tropical 86°F (30°C). With sustained exposure and activity, exhaustion becomes probable, resulting in heat cramps.The standards for the heat index are set for locations in shade and under light breezes. The heat index has the potential to rise by 15 Fahrenheit (8 Celsius) degrees with direct sunshine exposure.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', combines both the air temperature and the humidity level to give a perceived human temperature. Elements such as metabolic variations, pregnancy, and physical exertion can shape one's weather perception. Taking into account that direct sunlight can boost the heat effect, the heat index may rise by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly 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
The average relative humidity in September in Knobel is 73%.Rainfall
The month with the least rainfall in Knobel is September, when the rain falls for 10.6 days and typically collects 1.89" (48mm) of precipitation.Snowfall
In Knobel, snow does not fall in April through September.Daylight
In Knobel, Arkansas, the average length of the day in September is 12h and 24min.On the first day of September in Knobel, sunrise is at 6:34 am and sunset at 7:29 pm. On the last day of the month, sunrise is at 6:57 am and sunset at 6:46 pm CDT.
Sunshine
In September, the average sunshine in Knobel is 9.6h.UV index
In September, the average daily maximum UV index 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 the ordinary person.Note: An average UV index of 5 in September transforms into this advice:
Guard yourself - Avoiding sunburn is suggested. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Knobel, AR
- Average high temperature in September: 81.9°F
The warmest month (with the highest average high temperature) is July (89.1°F).
The month with the lowest average high temperature is January (43.5°F).
- Average low temperature in September: 63°F
The month with the highest average low temperature is July (71.4°F).
The coldest month (with the lowest average low temperature) is January (30.9°F).
Average pressure in September
Knobel, AR
- Average pressure in September: 30.01"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Knobel, AR
- Average wind speed in September: 6.3mph
The windiest month (with the highest average wind speed) is February (9.5mph).
The calmest month (with the lowest average wind speed) is August (5.8mph).
Average humidity in September
Knobel, AR
- Average humidity in September: 73%
The months with the highest relative humidity are March and May (78%).
The month with the lowest relative humidity is October (68%).
Average rainfall in September
Knobel, AR
- Average rainfall in September: 1.89"
The wettest months (with the highest rainfall) are April and May (4.37").
The driest month (with the least rainfall) is September (1.89").
Average rainfall days in September
Knobel, AR
- Average rainfall days in September: 10.6 days
The month with the highest number of rainy days is May (16 days).
The month with the least rainy days is January (8.8 days).
Average snowfall in September
Knobel, AR
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.18").
The months with the least snowfall are April, May, June, July, August and September (0").
Average snowfall days in September
Knobel, AR
- Average snowfall days in September: 0 days
The months with the highest number of snowfall days are January and February (2.3 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
Knobel, AR
- 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 42min).
- Average sunshine in September: 9h and 36min
The month with the most sunshine is June (Average sunshine: 10h and 48min).
The month with the least sunshine is February (Average sunshine: 4h and 54min).
Average sunshine days in September
Knobel, AR
- Average sunshine days in September: 17.5 days
The month with the most sunshine days is October (19.5 days).
The month with the least sunshine days is July (13.2 days).
Average UV index in September
Knobel, AR
- Average UV index in September: 5
The month with the highest UV index is July (UV index 7).
The month with the lowest UV index is December (UV index 2).
Average cloud cover in September
Knobel, AR
- Average cloud cover in September: 27
The months with the most cloud cover are February and March (Cloud cover 46).
The month with the least cloud cover is June (Cloud cover 24).
Average visibility in September
Knobel, AR
- 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).
