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
Union experiences a recorded average high-temperature of a still hot 86.5°F (30.3°C) in September, closely aligned with August's 91°F (32.8°C). During September, Union experiences an average low-temperature of 66.6°F (19.2°C) at night.Heat index
For September, the heat index is computed to be a fiery hot 98.6°F (37°C). More protective measures are required - heat exhaustion and heat cramps are likely. Heatstroke may follow lengthy activity.It is crucial to understand that heat index figures are for shade and gentle wind conditions. The direct sunshine could escalate the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'real feel', is a composite of temperature and humidity figures to convey how warm it feels. The perception of temperature can be subjective, varying based on activity and individual heat sensitivity, influenced by factors like wind, attire, and metabolic variations. The sun, when shining directly, can have a significant impact on the perceived temperature, increasing the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to babies and toddlers. Kids are usually more vulnerable than adults, given their lesser sweating ability. Along with their larger skin surface relative to their small stature and the excess heat due to their activity, their risk is amplified.
Humans rely on perspiration as a cooling mechanism, wherein the evaporating sweat counteracts excessive warmth. When relative humidity is on the rise, it curtails evaporation, thereby reducing the heat elimination from the body and causing the feeling of being excessively hot. When body temperature rises due to an imbalance in heat gain, there's a potential for dehydration and overheating.
Humidity
In September, the average relative humidity in Union is 73%.Rainfall
In Union, in September, during 13.8 rainfall days, 2.76" (70mm) of precipitation is typically accumulated. In Union, during the entire year, the rain falls for 162.2 days and collects up to 34.8" (884mm) of precipitation.Snowfall
April through November are months without snowfall in Union, Mississippi.Daylight
In September, the average length of the day in Union, Mississippi, is 12h and 22min.On the first day of September in Union, sunrise is at 6:31 am and sunset at 7:20 pm. On the last day of the month, sunrise is at 6:50 am and sunset at 6:42 pm CDT.
Sunshine
The average sunshine in September in Union is 9.2h.UV index
The average daily maximum UV index in September in Union is 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV radiation for average individuals.Note: A typical high UV index of 6 in September suggests the following recommendations:
Refrain from overexposure. Fair-skinned individuals could burn in under 20 minutes. The Sun's UV radiation is most potent between the hours of 10 a.m. and 4 p.m. Try to avoid direct sunlight during this time. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot is it in Union in September?
What is the average humidity in September in Union?
How much does it rain in Union in September?
When it does not snow in Union?
What is the average length of the day in September in Union?
When is the sunrise / sunset in September in Union?
How long on average sun shines in September in Union?
What is the UV index reading in September in Union?
Average temperature in September
Union, MS
- Average high temperature in September: 86.5°F
The warmest month (with the highest average high temperature) is July (91.4°F).
The month with the lowest average high temperature is January (53.2°F).
- Average low temperature in September: 66.6°F
The months with the highest average low temperature are July and August (71.2°F).
The coldest month (with the lowest average low temperature) is January (37°F).
Average pressure in September
Union, 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
Union, MS
- Average wind speed in September: 5.3mph
The windiest month (with the highest average wind speed) is February (7.9mph).
The calmest month (with the lowest average wind speed) is August (4.9mph).
Average humidity in September
Union, MS
- Average humidity in September: 73%
The month with the highest relative humidity is December (81%).
The month with the lowest relative humidity is October (70%).
Average rainfall in September
Union, MS
- Average rainfall in September: 2.76"
The wettest month (with the highest rainfall) is December (3.54").
The driest month (with the least rainfall) is November (2.09").
Average rainfall days in September
Union, MS
- Average rainfall days in September: 13.8 days
The month with the highest number of rainy days is July (20.6 days).
The month with the least rainy days is November (8.6 days).
Average snowfall in September
Union, MS
- Average snowfall in September: 0"
The month with the highest snowfall is January (0.51").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").
Average snowfall days in September
Union, MS
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (1.1 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
Union, MS
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 6min).
- Average sunshine in September: 9h and 1min
The month with the most sunshine is June (Average sunshine: 10h and 30min).
The months with the least sunshine are February and December (Average sunshine: 4h and 48min).
Average sunshine days in September
Union, MS
- Average sunshine days in September: 15.5 days
The month with the most sunshine days is October (20.8 days).
The month with the least sunshine days is July (8.8 days).
Average UV index in September
Union, MS
- 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 and December (UV index 3).
Average cloud cover in September
Union, MS
- Average cloud cover in September: 30
The months with the most cloud cover are February and December (Cloud cover 48).
The months with the least cloud cover are September and October (Cloud cover 30).
Average visibility in September
Union, MS
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, June, August, September, October, November and December (6mi).
The months with the lowest visibility are May and July (5mi).
Union, Mississippi, USA
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