September weather forecastHowell, AR
September
Weather in September
September, the first month of the autumn in Howell, is still a warm month, with temperature in the range of an average high of 83.3°F (28.5°C) and an average low of 64.8°F (18.2°C).Temperature
Howell signifies an average high-temperature of a moderately hot 83.3°F (28.5°C) in September, closely mirroring the 87.6°F (30.9°C) of August. Throughout September, the temperature falls to an average low of 64.8°F (18.2°C).Heat index
In September, the heat index is computed to be a tropical 89.6°F (32°C). Persisting in activity during exposure could lead to weariness and subsequently to heat cramps.The heat index's values are generally associated with conditions in shade and light breezes. The heat index could see an increase by 15 Fahrenheit (8 Celsius) degrees under direct sunshine.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. Additional factors encompassing metabolic differences, the level of physical activity, and clothing can impact the individual's perception of temperature. One must note that being under the direct sun can escalate the heat's effects, with the heat index possibly rising by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Youngsters typically face more danger than adults since they sweat less. Their larger skin surface compared to their small bodies and heightened heat production from their activities augment their vulnerability.
Humidity
In September, the average relative humidity in Howell, Arkansas, is 73%.Rainfall
The month with the least rainfall in Howell is September, when the rain falls for 8.6 days and typically collects 0.63" (16mm) of precipitation.Snowfall
In Howell, snow does not fall in April through October.Daylight
In September, the average length of the day in Howell is 12h and 23min.On the first day of September in Howell, sunrise is at 6:38 am and sunset at 7:31 pm. On the last day of the month, sunrise is at 6:59 am and sunset at 6:49 pm CDT.
Sunshine
The average sunshine in September is 9.9h.UV index
The average daily maximum UV index in September in Howell is 5. A UV Index reading of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for average individuals.Note: The maximum UV index of 5 during September leads to these instructions:
Stay alert. Light-skinned people could suffer burns in less than 30 minutes. It's recommended to limit sun exposure when its radiation is at its peak during midday. To cut down UV radiation exposure by about half, sport a wide-brim hat.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Howell, AR
- Average high temperature in September: 83.3°F
The warmest month (with the highest average high temperature) is July (89.2°F).
The month with the lowest average high temperature is January (46.9°F).
- Average low temperature in September: 64.8°F
The month with the highest average low temperature is July (72.1°F).
The coldest month (with the lowest average low temperature) is January (33.4°F).
Average pressure in September
Howell, 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
Howell, AR
- Average wind speed in September: 5.9mph
The windiest month (with the highest average wind speed) is February (9.5mph).
The calmest months (with the lowest average wind speed) are July and August (5.7mph).
Average humidity in September
Howell, AR
- Average humidity in September: 73%
The month with the highest relative humidity is March (78%).
The month with the lowest relative humidity is October (67%).
Average rainfall in September
Howell, AR
- Average rainfall in September: 0.63"
The wettest months (with the highest rainfall) are April and May (1.57").
The driest month (with the least rainfall) is September (0.63").
Average rainfall days in September
Howell, AR
- Average rainfall days in September: 8.6 days
The month with the highest number of rainy days is July (13.7 days).
The month with the least rainy days is January (7 days).
Average snowfall in September
Howell, AR
- Average snowfall in September: 0"
The months with the highest snowfall are January and February (0.16").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Howell, AR
- Average snowfall days in September: 0 days
The months with the highest number of snowfall days are January and February (1.1 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
Howell, AR
- Average daylight in September: 12h and 24min
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 48min).
- Average sunshine in September: 9h and 54min
The month with the most sunshine is June (Average sunshine: 10h and 54min).
The month with the least sunshine is February (Average sunshine: 5h and 0min).
Average sunshine days in September
Howell, AR
- Average sunshine days in September: 17.9 days
The months with the most sunshine days are January and October (21.9 days).
The month with the least sunshine days is July (13.6 days).
Average UV index in September
Howell, AR
- Average UV index in September: 5
The months with the highest UV index are June and July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in September
Howell, AR
- Average cloud cover in September: 27
The month with the most cloud cover is February (Cloud cover 45).
The month with the least cloud cover is June (Cloud cover 24).
Average visibility in September
Howell, 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).
