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
Start of September brings a slight shift in the average high-temperature, dipping a bit from August's hot 86.4°F (30.2°C) to a warm 81°F (27.2°C). Flat Rock usually reports an average low-temperature of 61.3°F (16.3°C) during the month of September.Heat index
The heat index in September is appraised at a hot 86°F (30°C). If exposure and activity persist, fatigue could ensue, possibly leading to heat cramps.The standards for the heat index are set for locations in shade and under light breezes. An exposure to direct sunlight may lift the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'feels like', is achieved by amalgamating air temperature with the relative humidity readings. The impression of weather on a person can be swayed by additional aspects, including metabolic variations, pregnancy, and activity levels. Keep aware, the sun, when shining directly, can intensify the heat experience, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly important for children. Children often lack awareness of the importance of taking breaks and rehydrating. The feeling of thirst is a late indication of dehydration, so maintaining hydration, especially during long periods of physical activity, is critical.
Humidity
In Flat Rock, the average relative humidity in September is 77%.Rainfall
In Flat Rock, Alabama, during September, the rain falls for 15.4 days and regularly aggregates up to 3.11" (79mm) of precipitation. Throughout the year, there are 191.1 rainfall days, and 48.94" (1243mm) of precipitation is accumulated.Snowfall
In Flat Rock, snow does not fall in May through October.Daylight
In September, the average length of the day is 12h and 23min.On the first day of September, sunrise is at 6:16 am and sunset at 7:08 pm. On the last day of the month, sunrise is at 6:37 am and sunset at 6:27 pm CDT.
Sunshine
The average sunshine in September is 8.3h.UV index
In Flat Rock, the average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV radiation for average individuals.Note: In September, a daily maximum UV index of 5 leads to the following instructions:
Take precautions - Protection against skin and eye damage is obliged. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. Stay sun-safe with clothing that is both closely woven and worn loosely.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures in Flat Rock?
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?
What time are sunrise and sunset in September in Flat Rock?
How long on average sun shines in September?
What is the UV index reading in September?
Average temperature in September
Flat Rock, AL
- Average high temperature in September: 81°F
The warmest month (with the highest average high temperature) is July (87.4°F).
The month with the lowest average high temperature is January (46.8°F).
- Average low temperature in September: 61.3°F
The month with the highest average low temperature is July (67.5°F).
The coldest month (with the lowest average low temperature) is January (31.8°F).
Average pressure in September
Flat Rock, AL
- Average pressure in September: 30.03"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
Flat Rock, AL
- Average wind speed in September: 4.6mph
The windiest month (with the highest average wind speed) is February (7.5mph).
The calmest months (with the lowest average wind speed) are July and August (4.3mph).
Average humidity in September
Flat Rock, AL
- Average humidity in September: 77%
The month with the highest relative humidity is December (81%).
The month with the lowest relative humidity is October (75%).
Average rainfall in September
Flat Rock, AL
- Average rainfall in September: 3.11"
The wettest month (with the highest rainfall) is July (5.24").
The driest month (with the least rainfall) is November (2.76").
Average rainfall days in September
Flat Rock, AL
- Average rainfall days in September: 15.4 days
The month with the highest number of rainy days is July (22.4 days).
The month with the least rainy days is November (10.3 days).
Average snowfall in September
Flat Rock, AL
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.02").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Flat Rock, AL
- Average snowfall days in September: 0 days
The months with the highest number of snowfall days are January and February (2.8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Flat Rock, AL
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 30min).
The month with the shortest days is December (Average daylight: 9h and 54min).
- Average sunshine in September: 8h and 2min
The month with the most sunshine is June (Average sunshine: 10h and 18min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).
Average sunshine days in September
Flat Rock, AL
- Average sunshine days in September: 13.2 days
The month with the most sunshine days is October (18.3 days).
The month with the least sunshine days is July (7 days).
Average UV index in September
Flat Rock, AL
- Average UV index in September: 5
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January and December (UV index 2).
Average cloud cover in September
Flat Rock, AL
- Average cloud cover in September: 32
The month with the most cloud cover is February (Cloud cover 51).
The months with the least cloud cover are June and September (Cloud cover 32).
Average visibility in September
Flat Rock, AL
- Average visibility in September: 5mi
The months with the highest visibility are April, June, October and November (6mi).
The months with the lowest visibility are January, February, March, May, July, August, September and December (5mi).
Flat Rock, Alabama, USA
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