September weather forecastOld Union, MS
September
Weather in September
The first month of the autumn, September, is still a warm month in Old Union, Mississippi, with temperature in the range of an average low of 65.3°F (18.5°C) and an average high of 85.3°F (29.6°C).Temperature
In Old Union, the average high-temperature in September gently drops from a hot 90.7°F (32.6°C) in August to a warm 85.3°F (29.6°C). The average low-temperature of 65.3°F (18.5°C) is witnessed in Old Union during September.Heat index
In September, the heat index is estimated at a sweltering 95°F (35°C). Adopt enhanced safety measures, heat exhaustion and heat cramps could occur. Continuous activity may induce heatstroke.When considering the heat index, it's pivotal to note it is for shade and mild wind conditions. When under direct sunshine, the heat index may be elevated by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'feels like', combines both the air temperature and the humidity level to give a perceived human temperature. This effect is personal, shaped by the individual's physical activity and heat sensitivity, influenced by factors including wind, clothing, and metabolic variances. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical to babies and toddlers. Kids generally face higher risks than adults as they sweat less. Along with their large skin surface compared to their small bodies and higher heat production due to their activities, their vulnerability is increased.
The human body has a built-in cooling mechanism through perspiration; evaporating sweat dissipates the excess heat. Increased relative humidity interferes with body cooling by slowing the rate of evaporation, resulting in a slower body cooling rate and a heightened feeling of heat. Overheating risks increase with rising body temperatures, especially if heat release isn't efficient.
Humidity
In September, the average relative humidity is 72%.Rainfall
In Old Union, in September, it is raining for 11 days, with typically 2.05" (52mm) of accumulated precipitation. In Old Union, during the entire year, the rain falls for 155.2 days and collects up to 33.27" (845mm) of precipitation.Snowfall
April through November are months without snowfall in Old Union.Daylight
In Old Union, Mississippi, the average length of the day in September is 12h and 22min.On the first day of the month, sunrise is at 6:28 am and sunset at 7:20 pm. On the last day of September, sunrise is at 6:49 am and sunset at 6:40 pm CDT.
Sunshine
In September, the average sunshine in Old Union, Mississippi, is 9.4h.UV index
The average daily maximum UV index in September in Old Union is 5. A UV Index estimate of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for the average person.Note: In September, a regular UV index of 5 translates into these guidelines:
Put precautions into practice - Protective measures against sun-induced damage are advised. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Old Union, MS
- Average high temperature in September: 85.3°F
The warmest month (with the highest average high temperature) is July (90.9°F).
The month with the lowest average high temperature is January (49.6°F).
- Average low temperature in September: 65.3°F
The month with the highest average low temperature is July (71.2°F).
The coldest month (with the lowest average low temperature) is January (34.7°F).
Average pressure in September
Old Union, MS
- 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 (29.96"Hg).
Average wind speed in September
Old Union, MS
- Average wind speed in September: 5.3mph
The windiest month (with the highest average wind speed) is February (7.7mph).
The calmest months (with the lowest average wind speed) are July and August (4.7mph).
Average humidity in September
Old Union, MS
- Average humidity in September: 72%
The month with the highest relative humidity is December (80%).
The month with the lowest relative humidity is October (71%).
Average rainfall in September
Old Union, MS
- Average rainfall in September: 2.05"
The wettest month (with the highest rainfall) is February (3.58").
The driest month (with the least rainfall) is November (1.81").
Average rainfall days in September
Old Union, MS
- Average rainfall days in September: 11 days
The month with the highest number of rainy days is July (17.8 days).
The month with the least rainy days is November (8.5 days).
Average snowfall in September
Old Union, MS
- Average snowfall in September: 0"
The months with the highest snowfall are January and February (0.43").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").
Average snowfall days in September
Old Union, MS
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (1.8 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
Old Union, MS
- Average daylight in September: 12h and 24min
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 24min
The month with the most sunshine is June (Average sunshine: 10h and 42min).
The months with the least sunshine are February and December (Average sunshine: 4h and 48min).
Average sunshine days in September
Old Union, MS
- Average sunshine days in September: 16.5 days
The month with the most sunshine days is November (19.9 days).
The month with the least sunshine days is July (10.8 days).
Average UV index in September
Old Union, MS
- 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
Old Union, MS
- Average cloud cover in September: 28
The months with the most cloud cover are February and December (Cloud cover 49).
The months with the least cloud cover are June and September (Cloud cover 28).
Average visibility in September
Old Union, MS
- 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).
