September weather forecastWillow, AR
September
Weather in September
The first month of the autumn, September, is still a warm month in Willow, Arkansas, with an average temperature fluctuating between 85.5°F (29.7°C) and 64.8°F (18.2°C).Temperature
The beginning of September subtly marks a decrease in the average high-temperature, transitioning from a hot 91.4°F (33°C) in August to a moderately hot 85.5°F (29.7°C). In the month of September, Willow records a consistent average low-temperature of 64.8°F (18.2°C).Heat index
September's heat index is computed to be a torrid 95°F (35°C). Ensure extra safety measures, heat exhaustion and heat cramps are likely. Continuous activity might result in heatstroke.Always consider that heat index estimations are for light winds and places in the shade. Heat index values may rise by up to 15 Fahrenheit (8 Celsius) degrees when exposed to direct sunlight.
Note: The heat index, also known as 'feels like' or 'apparent temperature', takes into account both air temperature and humidity to illustrate what people actually feel. Additional elements encompassing metabolic differences, the degree of physical activity, and attire can impact the individual's perception of temperature. Recognize that direct exposure to the sun can escalate the heat effect, potentially adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values hold particular importance for children. Younglings are generally more in peril than adults due to their reduced perspiration. Coupled with a larger skin surface relative to their tiny bodies and greater heat production because of their activity, they become more at risk.
Perspiring is how the human body naturally cools down, as sweat's evaporation takes away excess heat. When relative humidity is on the rise, it curtails evaporation, thereby reducing the heat elimination from the body and causing the feeling of being excessively hot. When the heat gained surpasses the body's cooling capacity, temperatures rise, signaling potential health concerns.
Humidity
The months with the lowest humidity are July, September and October, with an average relative humidity of 72%.Rainfall
The month with the least rainfall is September, when the rain falls for 13.4 days and typically collects 2.24" (57mm) of precipitation.Snowfall
April through October are months without snowfall.Daylight
The average length of the day in September is 12h and 22min.On the first day of the month, sunrise is at 6:45 am and sunset at 7:36 pm. On the last day of September, sunrise is at 7:05 am and sunset at 6:56 pm CDT.
Sunshine
In Willow, Arkansas, the average sunshine in September is 9.5h.UV index
In Willow, the average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV rays for the ordinary person.Note: The UV index of 6 during September leads to these advisories:
Dodge overexposure. Fair-skinned people can get singed in less than 20 minutes. Avoid direct Sun exposure and stay in the shade between 10 a.m. and 4 p.m., a time when UV radiation is most intense, noting that not all shade structures offer full protection. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Willow, AR
- Average high temperature in September: 85.5°F
The warmest month (with the highest average high temperature) is July (92.1°F).
The month with the lowest average high temperature is January (49.6°F).
- Average low temperature in September: 64.8°F
The month with the highest average low temperature is July (71.6°F).
The coldest month (with the lowest average low temperature) is January (33.6°F).
Average pressure in September
Willow, AR
- 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 (29.94"Hg).
Average wind speed in September
Willow, AR
- Average wind speed in September: 4.9mph
The windiest month (with the highest average wind speed) is April (7.5mph).
The calmest month (with the lowest average wind speed) is August (4.7mph).
Average humidity in September
Willow, AR
- Average humidity in September: 72%
The month with the highest relative humidity is March (80%).
The months with the lowest relative humidity are July, September and October (72%).
Average rainfall in September
Willow, AR
- Average rainfall in September: 2.24"
The wettest month (with the highest rainfall) is April (4.53").
The driest month (with the least rainfall) is September (2.24").
Average rainfall days in September
Willow, AR
- Average rainfall days in September: 13.4 days
The month with the highest number of rainy days is August (18.3 days).
The month with the least rainy days is November (10.2 days).
Average snowfall in September
Willow, AR
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.91").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Willow, AR
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (1.8 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Willow, AR
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).
- Average sunshine in September: 9h and 30min
The months with the most sunshine are June, July and August (Average sunshine: 10h and 24min).
The months with the least sunshine are January and February (Average sunshine: 5h and 12min).
Average sunshine days in September
Willow, AR
- Average sunshine days in September: 13.9 days
The month with the most sunshine days is January (18.6 days).
The month with the least sunshine days is August (10 days).
Average UV index in September
Willow, AR
- 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
Willow, AR
- Average cloud cover in September: 28
The month with the most cloud cover is February (Cloud cover 48).
The months with the least cloud cover are June and September (Cloud cover 28).
Average visibility in September
Willow, AR
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, June, July, August, September, October and November (6mi).
The months with the lowest visibility are May and December (5mi).
