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
Arm's transition from August to September introduces an average high-temperature of a still tropical 87.4°F (30.8°C), marking an insignificant variation from the 91.4°F (33°C). During the month of September, the temperature falls to an average of 67.8°F (19.9°C).Heat index
The average heat index in September is calculated to be a very hot 102.2°F (39°C). Implement additional safety measures to avoid heat cramps and heat exhaustion. Persistent activity might trigger heatstroke.The standards for the heat index are set for locations in shade and under light breezes. Facing direct sunlight may hike up the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', is a numerical representation of warmth when taking temperature and moisture levels into account. The impact of weather on an individual can be subjective, affected by the person's activity and heat perception, which can vary due to elements including wind, clothing, and metabolic differences. Being aware that direct sunlight can impact the felt heat might mean an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for babies and toddlers. Children often do not understand the need to rest and hydrate. Thirst is a late manifestation of dehydration - therefore, it is essential to stay hydrated, particularly during prolonged physical activities.
The human body normally cools itself by perspiration. Excessive warmth is eliminated from the body by evaporation of sweat. During conditions of high air temperature and humidity (high heat index), the body's ability to perspire is inhibited, increasing the sensation of warmth. Heat-related complications, like dehydration, can manifest if the body's heat gain exceeds its dissipation capacity.
Humidity
The average relative humidity in September is 75%.Rainfall
In September, the rain falls for 16.4 days. Throughout September, 2.91" (74mm) of precipitation is accumulated. In Arm, Mississippi, during the entire year, the rain falls for 175.1 days and collects up to 38.9" (988mm) of precipitation.Snowfall
In Arm, Mississippi, snow does not fall in April through November.Daylight
The average length of the day in September is 12h and 21min.On the first day of September, sunrise is at 6:36 am and sunset at 7:23 pm. On the last day of the month, sunrise is at 6:53 am and sunset at 6:45 pm CDT.
Sunshine
In Arm, the average sunshine in September is 9.5h.UV index
The average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for average individuals.Note: In September, the maximum UV index of 5 translates into these guidelines:
Make use of precautions - Shielding skin and eyes from injury is a requirement. Considering the harmful UV rays from the Sun during midday, it's essential to reduce exposure. A hat with a broad brim is indispensable, filtering out up to half of UV rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Is it hot during September?
What is the average humidity in September?
How much does it rain in September?
When it does not snow?
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?
What is the UV index reading in September?
Average temperature in September
Arm, MS
- Average high temperature in September: 87.4°F
The warmest month (with the highest average high temperature) is July (91.6°F).
The month with the lowest average high temperature is January (55.9°F).
- Average low temperature in September: 67.8°F
The months with the highest average low temperature are July and August (72°F).
The coldest month (with the lowest average low temperature) is January (38.8°F).
Average pressure in September
Arm, 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
Arm, MS
- Average wind speed in September: 5mph
The windiest months (with the highest average wind speed) are February and April (7.3mph).
The calmest months (with the lowest average wind speed) are July and August (4.8mph).
Average humidity in September
Arm, MS
- Average humidity in September: 75%
The months with the highest relative humidity are February and December (81%).
The month with the lowest relative humidity is October (71%).
Average rainfall in September
Arm, MS
- Average rainfall in September: 2.91"
The wettest month (with the highest rainfall) is August (4.25").
The driest month (with the least rainfall) is November (2.4").
Average rainfall days in September
Arm, MS
- Average rainfall days in September: 16.4 days
The month with the highest number of rainy days is August (21.6 days).
The month with the least rainy days is November (9.3 days).
Average snowfall in September
Arm, MS
- Average snowfall in September: 0"
The months with the highest snowfall are January and December (0.31").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").
Average snowfall days in September
Arm, 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
Arm, 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 3min
The month with the most sunshine is June (Average sunshine: 10h and 36min).
The months with the least sunshine are February and December (Average sunshine: 4h and 54min).
Average sunshine days in September
Arm, MS
- Average sunshine days in September: 11.7 days
The month with the most sunshine days is October (20.5 days).
The month with the least sunshine days is August (8.1 days).
Average UV index in September
Arm, MS
- Average UV index in September: 5
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
Arm, MS
- Average cloud cover in September: 31
The month with the most cloud cover is February (Cloud cover 49).
The month with the least cloud cover is October (Cloud cover 29).
Average visibility in September
Arm, 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).
Arm, Mississippi, USA
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