September weather forecastJohnson, MS
September
Weather in September
September, the first month of the autumn in Johnson, is also a hot month, with temperature in the range of an average high of 87.6°F (30.9°C) and an average low of 68°F (20°C).Temperature
Johnson, Mississippi, starts September with an average high-temperature of a still tropical 87.6°F (30.9°C), hinting at a minimal fluctuation from August. During September, the average low-temperature in Johnson is an agreeable 68°F (20°C).Heat index
The heat index value during September is calculated to be a very hot 102.2°F (39°C). Undertake additional safety actions, risk of heat cramps and heat exhaustion is significant. Persistent activity may induce heatstroke.Heat index values are typically calculated for conditions of shade and a light breeze. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'real feel', reflects the feeling of heat when considering both air temperature and humidity. An individual's perception of weather can be influenced by a variety of factors including metabolic differences, being pregnant, and their degree of physical exertion. Keep aware, the sun, when shining directly, can intensify the heat experience, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Typically, young kids are at a higher risk than adults since they sweat less. Also, the larger skin surface in proportion to their small bodies and the heightened heat production due to their active nature adds to their vulnerability.
When temperatures rise, the human body turns to perspiration, using the cooling power of evaporating sweat. With excessive moisture in the atmosphere, the effectiveness of the evaporation process is decreased, causing the body to cool down less efficiently, leading to a sensation of overheating. When heat surpasses the body's release mechanisms, dehydration and overheating risks become pronounced.
Humidity
In Johnson, the average relative humidity in September is 76%.Rainfall
In Johnson, in September, during 15.2 rainfall days, 2.72" (69mm) of precipitation is typically accumulated. In Johnson, during the entire year, the rain falls for 166.2 days and collects up to 34.88" (886mm) of precipitation.Snowfall
April through November are months without snowfall.Daylight
In September, the average length of the day in Johnson is 12h and 21min.On the first day of September, sunrise is at 6:32 am and sunset at 7:19 pm. On the last day of the month, sunrise is at 6:50 am and sunset at 6:42 pm CDT.
Sunshine
In Johnson, the average sunshine in September is 9.1h.UV index
In September, the average daily maximum UV index is 6. A UV Index value of 6 to 7 symbolizes a high health hazard from exposure to the Sun's UV rays for ordinary individuals.Note: A maximum high daily UV index of 6 during September translates into the following directions:
Employ safeguards and advocate sun safety protocols. Shielding against skin and eye damage is crucial. From 10 a.m. to 4 p.m., when UV radiation is at its strongest, limit direct exposure to the Sun and note that shade structures may not provide full sun protection. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Johnson, MS
- Average high temperature in September: 87.6°F
The warmest month (with the highest average high temperature) is August (91.6°F).
The month with the lowest average high temperature is January (56.7°F).
- Average low temperature in September: 68°F
The month with the highest average low temperature is July (72.5°F).
The coldest month (with the lowest average low temperature) is January (39.6°F).
Average pressure in September
Johnson, MS
- Average pressure in September: 29.99"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The months with the lowest atmospheric pressure are June and August (29.97"Hg).
Average wind speed in September
Johnson, MS
- Average wind speed in September: 4.8mph
The windiest months (with the highest average wind speed) are January, February and April (7mph).
The calmest month (with the lowest average wind speed) is July (4.5mph).
Average humidity in September
Johnson, MS
- Average humidity in September: 76%
The month with the highest relative humidity is December (82%).
The month with the lowest relative humidity is October (71%).
Average rainfall in September
Johnson, MS
- Average rainfall in September: 2.72"
The wettest month (with the highest rainfall) is July (4.13").
The driest month (with the least rainfall) is November (1.77").
Average rainfall days in September
Johnson, MS
- Average rainfall days in September: 15.2 days
The month with the highest number of rainy days is July (21.3 days).
The month with the least rainy days is November (8.6 days).
Average snowfall in September
Johnson, MS
- Average snowfall in September: 0"
The month with the highest snowfall is December (0.35").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").
Average snowfall days in September
Johnson, MS
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (0.8 days).
The months with the least snowfall days are April, May, June, July, August, September, October and November (0 days).
Average daylight in September /
Average sunshine in September
Johnson, MS
- Average daylight in September: 12h and 18min
The month with the longest days is June (Average daylight: 14h and 12min).
The month with the shortest days is December (Average daylight: 10h and 6min).
- Average sunshine in September: 9h and 6min
The month with the most sunshine is June (Average sunshine: 10h and 24min).
The months with the least sunshine are February and December (Average sunshine: 4h and 54min).
Average sunshine days in September
Johnson, MS
- Average sunshine days in September: 12.4 days
The month with the most sunshine days is October (20.6 days).
The month with the least sunshine days is August (7.3 days).
Average UV index in September
Johnson, MS
- Average UV index in September: 6
The months with the highest UV index are June, July and August (UV index 7).
The months with the lowest UV index are January and December (UV index 3).
Average cloud cover in September
Johnson, MS
- Average cloud cover in September: 32
The month with the most cloud cover is February (Cloud cover 50).
The month with the least cloud cover is October (Cloud cover 30).
Average visibility in September
Johnson, MS
- Average visibility in September: 5mi
The months with the highest visibility are January, February, October and November (6mi).
The months with the lowest visibility are March, April, May, June, July, August, September and December (5mi).
