September weather forecast and climate
Riderville, AL

Weather in September

The first month of the autumn, September, is still a tropical month in Riderville, Alabama, with average temperature fluctuating between 67.1°F (19.5°C) and 87.6°F (30.9°C).

Temperature

In Riderville, Alabama, the average high-temperature is relatively the same as in August - a still tropical 87.6°F (30.9°C). In September, in Riderville, the average low-temperature is 67.1°F (19.5°C).

Heat index

In September, the average heat index is estimated at a torrid 100.2°F (37.9°C). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With the exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like', 'apparent temperature', 'real feel', or 'felt air temperature', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (metabolic differences, differences in body mass, height, and shape, wind). Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. When the relative humidity is high, the evaporation rate is reduced. The warmth is removed from the body at a lower rate, causing the body to retain more heat than it would in dry air. When heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.

Humidity

The average relative humidity in Riderville is 72%.

Rainfall

September is the month with the least rainfall. Rain falls for 12.6 days and accumulates 1.93" (49mm) of precipitation.

Snowfall

In Riderville snow does not fall in April through November.

Daylight

The average length of the day is 12.4h.

Sunshine

In Riderville, the average sunshine is 9h.

UV index

The average daily maximum UV index in September is 6. A UV Index reading of 6 to 7 represents a high health hazard from unprotected exposure to the Sun's UV rays for the average person.
Note: The average daily UV index of 6 in September transform into the following instructions:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the temperature in September in Riderville?

In Riderville, in September, the average high-temperature is 87.6°F (30.9°C), and the average low-temperature is 67.1°F (19.5°C). The average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), that combines both air temperature and relative humidity, in September is evaluated at 100.2°F (37.9°C).

What is the average humidity in September in Riderville?

In September, the average relative humidity in Riderville, Alabama, is 72%.

How many days does it rain in September in Riderville?

In Riderville, Alabama, in September, during 12.6 rainfall days, 1.93" (49mm) of precipitation is typically accumulated.

What is the driest month in Riderville?

The month with the least rainfall is September when the rain falls for 12.6 days and typically collects 1.93" (49mm) of precipitation.

When it does not snow in Riderville?

In Riderville, Alabama, snow does not fall in April through November.

What is the average length of the day in September in Riderville?

In Riderville, Alabama, the average length of the day in September is 12.4h.

How long on average sun shines in September in Riderville?

The average sunshine in September in Riderville is 9h.

What is the UV index reading in September in Riderville?

The average daily maximum UV index in September in Riderville, Alabama, is 6. A UV Index reading of 6 to 7 represents a high health threat from the exposure to the Sun's UV radiation.

Average temperature in September
Riderville, AL

Average temperature in September - Riderville, AL
  • Average high temperature in September: 87.6°F

The warmest month (with the highest average high temperature) is July (92.1°F).
The month with the lowest average high temperature is January (54.3°F).

  • Average low temperature in September: 67.1°F

Months with the highest average low temperature are July and August (72°F).
The coldest month (with the lowest average low temperature) is January (38.5°F).

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Average pressure in September
Riderville, AL

Average pressure in September - Riderville, AL
  • Average pressure in September: 29.99"

The month with the highest atmospheric pressure is January (30.16").
Months with the lowest atmospheric pressure are June and August (29.97").

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Average wind speed in September
Riderville, AL

Average wind speed in September - Riderville, AL
  • Average wind speed in September: 5.2mph

The windiest month (with the highest average wind speed) is February (7.4mph).
The calmest months (with the lowest average wind speed) are July and August (4.7mph).

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Average humidity in September
Riderville, AL

Average humidity in September - Riderville, AL
  • Average humidity in September: 72%

The month with the highest relative humidity is December (80%).
The month with the lowest relative humidity is October (69%).

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Average rainfall in September
Riderville, AL

Average rainfall in September - Riderville, AL
  • Average rainfall in September: 1.93"

The wettest month (with the highest rainfall) is December (3.82").
The driest month (with the least rainfall) is September (1.93").

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Average rainfall days in September
Riderville, AL

Average rainfall days in September - Riderville, AL
  • Average rainfall days in September: 12.6 days

The month with the highest number of rainy days is July (20.5 days).
The month with the least rainy days is November (7.8 days).

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Average snowfall in September
Riderville, AL

Average snowfall in September - Riderville, AL
  • Average snowfall in September: 0"

The month with the highest snowfall is January (0.35").
Months with the least snowfall are April, May, June, July, August, September, October and November (0").

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Average snowfall days in September
Riderville, AL

Average snowfall days in September - Riderville, AL
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (0.8 days).
Months with the least snowfall days are April, May, June, July, August, September and October (0 days).

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Average daylight in September /
Average sunshine in September
Riderville, AL

Average daylight in September / Average sunshine in September - Riderville, AL
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.3h).
The month with the shortest days is December (Average daylight: 10h).

  • Average sunshine in September: 9h

The month with the most sunshine is June (Average sunshine: 10.6h).
Months with the least sunshine are February and December (Average sunshine: 4.9).

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Average sunshine days in September
Riderville, AL

Average sunshine days in September - Riderville, AL
  • Average sunshine days in September: 15.2 days

The month with the most sunshine days is October (21.7 days).
The month with the least sunshine days is July (8 days).

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Average UV index in September
Riderville, AL

Average UV index in September - Riderville, AL
  • Average UV index in September: 6

Months with the highest UV index are June, July and August (UV index 7).
Months with the lowest UV index are January and December (UV index 3).

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Average cloud cover in September
Riderville, AL

Average cloud cover in September - Riderville, AL
  • Average cloud cover in September: 30

Months with the most cloud cover are February and December (Cloud cover 47).
Months with the least cloud cover are September and October (Cloud cover 30).

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Average visibility in September
Riderville, AL

Average visibility in September - Riderville, AL
  • Average visibility in September: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, September, October, November and December (6mi).
The month with the lowest visibility is August (5mi).

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