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
Transitioning into September, Mystic records an average high-temperature of a still tropical 88°F (31.1°C), almost identical to August's 92.7°F (33.7°C). Mystic's nighttime temperature in September falls to an average of 70.5°F (21.4°C).Heat index
The heat index value for September is calculated to be a scorching 104°F (40°C). Exercise more precautions, heat cramps and heat exhaustion are potential risks. Continuous activity could precipitate heatstroke.In reference to the heat index, it's for places in shade and with a slight wind. The heat index may experience an enhancement of 15 Fahrenheit (8 Celsius) degrees under direct sunlight.
Note: The heat index, also known as 'real feel' or 'feels like', is a single figure representing how weather conditions feel when combining temperature and humidity. Additional elements including metabolic differences, the level of physical activity, and attire have a role in shaping the individual's temperature perception. Given direct exposure to sunlight, one might experience a rise in the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to 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 body's self-cooling mechanism is rooted in perspiration, where evaporating sweat cools down excessive warmth. Heightened relative humidity interferes with the body's usual cooling mechanism by reducing evaporation, subsequently decreasing the body's cooling rate and increasing the sensation of heat. When the heat gained surpasses the body's cooling capacity, temperatures rise, signaling potential health concerns.
Humidity
In September, the average relative humidity is 77%.Rainfall
In Mystic, during September, the rain falls for 17.2 days and regularly aggregates up to 2.44" (62mm) of precipitation. Throughout the year, there are 163.9 rainfall days, and 27.01" (686mm) of precipitation is accumulated.Snowfall
In Mystic, snow does not fall in February through November.Daylight
The average length of the day in September is 12h and 20min.On the first day of September, sunrise is at 6:51 am and sunset at 7:36 pm. On the last day of the month, sunrise is at 7:07 am and sunset at 7:00 pm CDT.
Sunshine
In September, the average sunshine is 9.5h.UV index
The average daily maximum UV index in September is 6. A UV Index of 6 to 7 symbolizes a high health risk from unprotected exposure to Sun's UV rays for the ordinary person.Note: The maximum daily UV index of 6 during September translates into the following directions:
Act on precautions and pay attention to sun safety recommendations. Avoidance of sunburn is obligatory. Limit your direct sun exposure, especially between 10 a.m. and 4 p.m., when UV radiation is strongest. Shade structures might not provide complete sun protection. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key. Be vigilant! The reflective nature of snow can increase the Sun's UV radiation nearly twofold.
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?
What is the average length of the day in September?
When is the sunrise / sunset in September?
How many hours of sunshine does Mystic have in September?
What is the UV index intensity in September?
Average temperature in September
Mystic, LA
- Average high temperature in September: 88°F
The warmest month (with the highest average high temperature) is July (92.8°F).
The month with the lowest average high temperature is January (58.6°F).
- Average low temperature in September: 70.5°F
The months with the highest average low temperature are July and August (74.8°F).
The coldest month (with the lowest average low temperature) is January (42.8°F).
Average pressure in September
Mystic, LA
- Average pressure in September: 29.96"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Mystic, LA
- Average wind speed in September: 5.7mph
The windiest month (with the highest average wind speed) is April (8.2mph).
The calmest month (with the lowest average wind speed) is August (5.4mph).
Average humidity in September
Mystic, LA
- Average humidity in September: 77%
The month with the highest relative humidity is February (82%).
The month with the lowest relative humidity is October (72%).
Average rainfall in September
Mystic, LA
- Average rainfall in September: 2.44"
The wettest month (with the highest rainfall) is August (4.37").
The driest month (with the least rainfall) is February (1.1").
Average rainfall days in September
Mystic, LA
- Average rainfall days in September: 17.2 days
The month with the highest number of rainy days is August (20.3 days).
The month with the least rainy days is January (9.7 days).
Average snowfall in September
Mystic, LA
- Average snowfall in September: 0"
The month with the highest snowfall is January (0.12").
The months with the least snowfall are February, March, April, May, June, July, August, September, October and November (0").
Average snowfall days in September
Mystic, LA
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is January (0.3 days).
The months with the least snowfall days are March, April, May, June, July, August, October and November (0 days).
Average daylight in September /
Average sunshine in September
Mystic, LA
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 6min).
The month with the shortest days is December (Average daylight: 10h and 12min).
- Average sunshine in September: 9h and 3min
The month with the most sunshine is June (Average sunshine: 10h and 18min).
The month with the least sunshine is December (Average sunshine: 4h and 54min).
Average sunshine days in September
Mystic, LA
- Average sunshine days in September: 11.2 days
The month with the most sunshine days is January (18.6 days).
The month with the least sunshine days is August (7.6 days).
Average UV index in September
Mystic, LA
- Average UV index in September: 6
The months with the highest UV index are June, July and August (UV index 7).
The month with the lowest UV index is December (UV index 3).
Average cloud cover in September
Mystic, LA
- Average cloud cover in September: 31
The month with the most cloud cover is February (Cloud cover 51).
The month with the least cloud cover is October (Cloud cover 28).
Average visibility in September
Mystic, LA
- Average visibility in September: 5mi
The months with the highest visibility are January, February, March, April, May, June, October, November and December (6mi).
The months with the lowest visibility are July, August and September (5mi).
Mystic, Louisiana, USA
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