September weather forecastGrand Bay, AL
September
Weather in September
September, the first month of the autumn in Grand Bay, is still a tropical month, with an average temperature fluctuating between 86.9°F (30.5°C) and 73.9°F (23.3°C).Temperature
The average high-temperature in September, at a still hot 86.9°F (30.5°C), reveals a modest deviation from August's 90.3°F (32.4°C). Grand Bay observes an average nighttime temperature of 73.9°F (23.3°C) during September.Heat index
September's average heat index is computed to be a sweltering 98.6°F (37°C). Incorporate additional preventive steps, heat exhaustion and heat cramps are possible. Long-lasting activity may cause heatstroke.Heat index details are generally centered around shaded locations and a mild breeze. Direct sunlight can cause a surge in the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'real feel', reflects the blend of air temperature and relative humidity to give a temperature impression. This effect tends to be personal, with the weather perception differing among individuals due to variations in body mass, height, and exertion. Consider the sun's direct rays and their impact; they can potentially increase the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to children. Children frequently underestimate the necessity to rest and hydrate. Thirst is a late sign of dehydration - thus, it is vital to stay hydrated, particularly during lengthy physical exercises.
One way the human body deals with excessive warmth is by perspiring and allowing sweat to evaporate. Relative humidity in excess curtails evaporation, therefore reducing heat dissipation from the body, leading to feelings of excess heat. When body temperature rises due to an imbalance in heat gain, there's a potential for dehydration and overheating.
Humidity
The average relative humidity in September in Grand Bay is 74%.Rainfall
In Grand Bay, in September, during 17.9 rainfall days, 3.94" (100mm) of precipitation is typically accumulated. Throughout the year, there are 173.5 rainfall days, and 40.98" (1041mm) of precipitation is accumulated.Snowfall
February through December are months without snowfall.Daylight
The average length of the day in September is 12h and 20min.On the first day of the month, sunrise is at 6:30 am and sunset at 7:15 pm. On the last day of September, sunrise is at 6:46 am and sunset at 6:39 pm CDT.
Sunshine
The average sunshine in September is 9.8h.UV index
In September, the average daily maximum UV index is 6. A UV Index estimate of 6 to 7 represents a high health risk from unprotected exposure to Sun's UV rays for the ordinary person.Note: The daily high UV index of 6 during September translates into the following recommendations:
Take precautions and utilize sun safety practices. Protection against skin and eye damage is required. Seek shade and limit direct Sun exposure between 10 a.m. and 4 p.m., when UV radiation is at its peak, but be aware that not all shade structures provide complete sun protection. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Grand Bay, AL
- Average high temperature in September: 86.9°F
The warmest month (with the highest average high temperature) is August (90.3°F).
The month with the lowest average high temperature is January (59.2°F).
- Average low temperature in September: 73.9°F
The month with the highest average low temperature is August (77.4°F).
The coldest month (with the lowest average low temperature) is January (45.5°F).
Average pressure in September
Grand Bay, AL
- Average pressure in September: 29.98"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The months with the lowest atmospheric pressure are June and August (29.97"Hg).
Average wind speed in September
Grand Bay, AL
- Average wind speed in September: 6.2mph
The windiest months (with the highest average wind speed) are January and April (8.1mph).
The calmest month (with the lowest average wind speed) is July (5.7mph).
Average humidity in September
Grand Bay, AL
- Average humidity in September: 74%
The month with the highest relative humidity is December (78%).
The month with the lowest relative humidity is October (70%).
Average rainfall in September
Grand Bay, AL
- Average rainfall in September: 3.94"
The wettest month (with the highest rainfall) is August (6.1").
The driest month (with the least rainfall) is November (2.01").
Average rainfall days in September
Grand Bay, AL
- Average rainfall days in September: 17.9 days
The month with the highest number of rainy days is July (24.1 days).
The month with the least rainy days is November (8.1 days).
Average snowfall in September
Grand Bay, AL
- Average snowfall in September: 0"
The month with the highest snowfall is January (0.16").
The months with the least snowfall are February, March, April, May, June, July, August, September, October, November and December (0").
Average snowfall days in September
Grand Bay, AL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (0.3 days).
The months with the least snowfall days are February, March, April, May, June, July, August, September, October and November (0 days).
Average daylight in September /
Average sunshine in September
Grand Bay, AL
- Average daylight in September: 12h and 18min
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 48min
The month with the most sunshine is June (Average sunshine: 11h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 18min).
Average sunshine days in September
Grand Bay, AL
- Average sunshine days in September: 10.5 days
The month with the most sunshine days is November (20.7 days).
The month with the least sunshine days is July (5.1 days).
Average UV index in September
Grand Bay, AL
- Average UV index in September: 6
The months with the highest UV index are May, June, July and August (UV index 7).
The month with the lowest UV index is December (UV index 3).
Average cloud cover in September
Grand Bay, AL
- Average cloud cover in September: 25
The month with the most cloud cover is December (Cloud cover 43).
The month with the least cloud cover is October (Cloud cover 23).
Average visibility in September
Grand Bay, AL
- 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).
