Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
The average high-temperature slightly decreases in September, shifting from a tropical 91.9°F (33.3°C) in August to a warm 85.8°F (29.9°C). In Jefferson, September nights cool down to an average of 65.1°F (18.4°C).Heat index
September's mean heat index is calculated to be a very hot 95°F (35°C). Implement additional cautionary measures, heat cramps and heat exhaustion could occur. Prolonged activity might induce heatstroke.Realize that the values for the heat index are set for shaded places and light winds. The heat index may scale up by 15 Fahrenheit (8 Celsius) degrees with direct sun exposure.
Note: The heat index, also known as 'real feel' or 'apparent temperature', is derived by integrating air temperature with the existing relative humidity to express the perceived warmth. A person's impression of weather can be shaped by many aspects, among them metabolic variations, pregnancy, and levels of physical activity. Take note that direct exposure to the sun can increase the felt temperature, possibly adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are highly critical for babies and toddlers. Young kids are often more at risk than adults as they tend to perspire less. Besides, their skin surface is larger relative to their small bodies, and their increased heat output from their active lifestyle compounds their risk.
When it comes to cooling down, the human body's primary method is through perspiration, making use of sweat evaporation to eliminate excess heat. When the air holds a significant amount of moisture, the efficiency of the evaporation process is decreased, preventing the body from cooling down efficiently, leading to the sensation of overheating. Accumulating more heat than the body can dissipate leads to an uptick in body temperature, with potential heat stress consequences.
Humidity
In Jefferson, the average relative humidity in September is 72%.Rainfall
In Jefferson, in September, it is raining for 11.6 days, with typically 2.36" (60mm) of accumulated precipitation. In Jefferson, during the entire year, the rain falls for 152.2 days and collects up to 35.59" (904mm) of precipitation.Snowfall
April through November are months without snowfall in Jefferson.Daylight
In September, the average length of the day in Jefferson is 12h and 23min.On the first day of September, sunrise is at 6:42 am and sunset at 7:34 pm. On the last day of the month, sunrise is at 7:03 am and sunset at 6:53 pm CDT.
Sunshine
The average sunshine in September is 9.4h.UV index
In Jefferson, the average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high health hazard from exposure to the Sun's UV radiation for the ordinary person.Note: A maximum high UV index of 6 in September translates into the following recommendations:
Persist in precautions and follow sun safety policies. Keeping sunburn at bay is imperative. Remember that UV radiation from the Sun is strongest between 10 a.m. and 4 p.m. Make an effort to limit direct sun exposure during this time. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck.
Frequently asked questions
How hot is September in Jefferson?
What is the average humidity in September in Jefferson?
How much does it rain in Jefferson in September?
When it does not snow in Jefferson?
How many hours of daylight does Jefferson have in September?
What time are sunrise and sunset in September in Jefferson?
How long on average sun shines in September in Jefferson?
How high is the UV index in September in Jefferson?
Average temperature in September
Jefferson, AR
- Average high temperature in September: 85.8°F
The warmest month (with the highest average high temperature) is July (92.8°F).
The month with the lowest average high temperature is January (50°F).
- Average low temperature in September: 65.1°F
The month with the highest average low temperature is July (72°F).
The coldest month (with the lowest average low temperature) is January (34.3°F).
Average pressure in September
Jefferson, 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
Jefferson, AR
- Average wind speed in September: 5.2mph
The windiest months (with the highest average wind speed) are March and April (7.7mph).
The calmest month (with the lowest average wind speed) is August (5mph).
Average humidity in September
Jefferson, AR
- Average humidity in September: 72%
The month with the highest relative humidity is March (79%).
The month with the lowest relative humidity is October (70%).
Average rainfall in September
Jefferson, AR
- Average rainfall in September: 2.36"
The wettest month (with the highest rainfall) is April (4.41").
The driest month (with the least rainfall) is July (2.28").
Average rainfall days in September
Jefferson, AR
- Average rainfall days in September: 11.6 days
The month with the highest number of rainy days is July (15.8 days).
The month with the least rainy days is November (9.4 days).
Average snowfall in September
Jefferson, AR
- Average snowfall in September: 0"
The month with the highest snowfall is January (0.67").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").
Average snowfall days in September
Jefferson, AR
- Average snowfall days in September: 0 days
The months with the highest number of snowfall days are January and February (1.3 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
Jefferson, AR
- Average daylight in September: 12h and 2min
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 2min
The month with the most sunshine is June (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 5h and 6min).
Average sunshine days in September
Jefferson, AR
- Average sunshine days in September: 16.4 days
The month with the most sunshine days is October (19.4 days).
The month with the least sunshine days is July (13.3 days).
Average UV index in September
Jefferson, AR
- Average UV index in September: 6
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
Jefferson, AR
- Average cloud cover in September: 29
The month with the most cloud cover is February (Cloud cover 47).
The month with the least cloud cover is June (Cloud cover 26).
Average visibility in September
Jefferson, 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).
Jefferson, Arkansas, USA
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