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
Jack experiences an average high-temperature of a still hot 87.3°F (30.7°C) in September, subtly different from August's 91.4°F (33°C). September nights observe an average temperature dip to a refreshing 67.6°F (19.8°C).Heat index
Throughout September, the heat index is calculated to be a very hot 100.4°F (38°C). Greater preventive actions are needed, heat exhaustion and heat cramps are likely. Persistent activity could provoke heatstroke.Note that heat index values are valued for light wind and location in the shade. Exposure to the direct sun could elevate the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'real feel', is a fusion of air temperature and moisture levels to demonstrate the sensation of heat. Elements such as metabolic variations, pregnancy, and physical exertion can shape one's weather perception. Exposure to direct sun rays can influence the heat you feel, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly important for children. Young ones are generally more prone to risk than adults due to their reduced ability to sweat. Their large skin surface area relative to their diminutive bodies and elevated heat production from their activities further enhance this risk.
Through perspiration, the body has a natural mechanism to eliminate excessive heat via sweat evaporation. Greater relative humidity lessens the rate of evaporation, thus decreasing the body's heat dispersal, which gives rise to a sensation of overheating. Excessive heat gain, when not shed effectively by the body, can result in increasing body temperatures and related hazards.
Humidity
In September, the average relative humidity is 74%.Rainfall
In September, the rain falls for 14.2 days. Throughout September, 2.76" (70mm) of precipitation is accumulated. In Jack, during the entire year, the rain falls for 163.6 days and collects up to 37.95" (964mm) of precipitation.Snowfall
March through November are months without snowfall.Daylight
The average length of the day in September is 12h and 21min.On the first day of September, sunrise is at 6:38 am and sunset at 7:26 pm. On the last day of the month, sunrise is at 6:56 am and sunset at 6:48 pm CDT.
Sunshine
In Jack, the average sunshine in September is 9.4h.UV index
In September, the average daily maximum UV index is 6. A UV Index estimate of 6 to 7 represents a high health hazard from unprotected exposure to Sun's UV rays for the ordinary person.Note: In September, the average maximum UV index of 6 translates into the following recommendations:
Dodge overexposure. Fair-skinned people can get singed in less than 20 minutes. Avoid exposure to the Sun and try to stay in the shade between 10 a.m. and 4 p.m., when UV radiation is most potent, but be aware that parasols or canopies may not offer full protection. Always opt for UVA and UVB-resistant sunglasses on radiant days.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot is September?
What is the average humidity in September?
How much does it rain in September?
When it does not snow in Jack?
What is the average length of the day in September?
When is the sunrise / sunset in September?
How long on average sun shines in September?
How high is the UV index in September?
Average temperature in September
Jack, MS
- Average high temperature in September: 87.3°F
The warmest month (with the highest average high temperature) is July (91.8°F).
The month with the lowest average high temperature is January (55°F).
- Average low temperature in September: 67.6°F
The months with the highest average low temperature are July and August (72.1°F).
The coldest month (with the lowest average low temperature) is January (38.5°F).
Average pressure in September
Jack, MS
- Average pressure in September: 29.99"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.96"Hg).
Average wind speed in September
Jack, MS
- Average wind speed in September: 5mph
The windiest months (with the highest average wind speed) are February and April (7.4mph).
The calmest months (with the lowest average wind speed) are July and August (4.9mph).
Average humidity in September
Jack, MS
- Average humidity in September: 74%
The months with the highest relative humidity are February and December (81%).
The month with the lowest relative humidity is October (70%).
Average rainfall in September
Jack, MS
- Average rainfall in September: 2.76"
The wettest month (with the highest rainfall) is August (4.21").
The driest month (with the least rainfall) is November (2.2").
Average rainfall days in September
Jack, MS
- Average rainfall days in September: 14.2 days
The months with the highest number of rainy days are July and August (19.7 days).
The month with the least rainy days is November (8.8 days).
Average snowfall in September
Jack, MS
- Average snowfall in September: 0"
The month with the highest snowfall is January (0.67").
The months with the least snowfall are March, April, May, June, July, August, September, October and November (0").
Average snowfall days in September
Jack, MS
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (0.9 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
Jack, MS
- Average daylight in September: 12h and 2min
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 2min
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 48min).
Average sunshine days in September
Jack, MS
- Average sunshine days in September: 14 days
The month with the most sunshine days is October (20.8 days).
The month with the least sunshine days is July (9.4 days).
Average UV index in September
Jack, MS
- Average UV index in September: 6
The months with the highest UV index are 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
Jack, MS
- Average cloud cover in September: 31
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
Jack, MS
- Average visibility in September: 5mi
The months with the highest visibility are January, February, March, April, June, October, November and December (6mi).
The months with the lowest visibility are May, July, August and September (5mi).
Jack, Mississippi, USA
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