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
The arrival of September records an average high-temperature of a warm 83.7°F (28.7°C), closely related to the 88.5°F (31.4°C) observed in August. In September, the nighttime temperature lowers to an average of 63.9°F (17.7°C).Heat index
In September, the heat index is appraised at a hot 91.4°F (33°C). Incorporate special precautions, risk of heat exhaustion and heat cramps is substantial. Sustained activity could cause heatstroke.Records show heat index calculations are tailored for shaded regions and mild winds. When under direct sunshine, the heat index may be elevated by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', is a metric representing the sensation of warmth when air temperature and moisture come together. A person's impression of weather can be affected by numerous aspects, among them metabolic variations, pregnancy, and activity levels. 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 children. In general, children are more at risk than adults because they sweat less. Furthermore, the large skin surface compared to their small bodies and the high heat production due to their actions contribute to this vulnerability.
Humidity
In September, the average relative humidity is 75%.Rainfall
In Bonny Brook, in September, during 13.7 rainfall days, 2.56" (65mm) of precipitation is typically accumulated. Throughout the year, there are 178.5 rainfall days, and 38.78" (985mm) of precipitation is accumulated.Snowfall
April through November are months without snowfall.Daylight
In Bonny Brook, Alabama, the average length of the day in September is 12h and 22min.On the first day of the month, sunrise is at 6:17 am and sunset at 7:08 pm. On the last day of September, sunrise is at 6:37 am and sunset at 6:28 pm CDT.
Sunshine
The average sunshine in September is 8.7h.UV index
In September, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for the ordinary person.Note: The daily high UV index of 5 during September translates into the following recommendations:
Take precautions. Light skin individuals may get burned in less than 30 minutes. To guard against the harmful effects of the Sun, minimize exposure during midday. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly.
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 many days does it rain in September?
When it does not snow?
How many hours of daylight does Bonny Brook have in September?
When are sunrise and sunset in September?
How many hours of sunshine does Bonny Brook have in September?
How high is the UV index in September?
Average temperature in September
Bonny Brook, AL
- Average high temperature in September: 83.7°F
The warmest month (with the highest average high temperature) is July (89.2°F).
The month with the lowest average high temperature is January (50°F).
- Average low temperature in September: 63.9°F
The month with the highest average low temperature is July (69.3°F).
The coldest month (with the lowest average low temperature) is January (34.3°F).
Average pressure in September
Bonny Brook, AL
- Average pressure in September: 30.02"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.98"Hg).
Average wind speed in September
Bonny Brook, AL
- Average wind speed in September: 4.5mph
The windiest month (with the highest average wind speed) is February (7.3mph).
The calmest month (with the lowest average wind speed) is August (4mph).
Average humidity in September
Bonny Brook, AL
- Average humidity in September: 75%
The month with the highest relative humidity is December (80%).
The month with the lowest relative humidity is October (73%).
Average rainfall in September
Bonny Brook, AL
- Average rainfall in September: 2.56"
The wettest month (with the highest rainfall) is December (3.78").
The driest month (with the least rainfall) is October (2.24").
Average rainfall days in September
Bonny Brook, AL
- Average rainfall days in September: 13.7 days
The month with the highest number of rainy days is July (22.7 days).
The month with the least rainy days is November (9.4 days).
Average snowfall in September
Bonny Brook, AL
- Average snowfall in September: 0"
The month with the highest snowfall is January (0.83").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").
Average snowfall days in September
Bonny Brook, AL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (1.4 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Bonny Brook, AL
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 10h and 0min).
- Average sunshine in September: 8h and 4min
The month with the most sunshine is June (Average sunshine: 10h and 42min).
The month with the least sunshine is February (Average sunshine: 4h and 54min).
Average sunshine days in September
Bonny Brook, AL
- Average sunshine days in September: 13.5 days
The month with the most sunshine days is October (19 days).
The month with the least sunshine days is July (7.3 days).
Average UV index in September
Bonny Brook, AL
- Average UV index in September: 5
The months with the highest UV index are May, June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 2).
Average cloud cover in September
Bonny Brook, AL
- Average cloud cover in September: 30
The months with the most cloud cover are February and December (Cloud cover 47).
The months with the least cloud cover are June and September (Cloud cover 30).
Average visibility in September
Bonny Brook, 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).
Bonny Brook, Alabama, USA
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