Huntsville
Alabama, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Huntsville, AL

A twilight shot of the colorful neon lights that lit up the buildings and roads of Huntsville in Alabama
A twilight shot of the colorful neon lights that lit up the buildings and roads of Huntsville in Alabama
September, the first month of the autumn, in Huntsville, is also a moderately hot month, with average temperature fluctuating between 61.7°F (16.5°C) and 84°F (28.9°C).

Temperature

In Huntsville, the average high-temperature marginally drops, from a hot 90°F (32.2°C) in August, to a warm 84°F (28.9°C). In Huntsville, the average low-temperature is 61.7°F (16.5°C).

Heat index

The average heat index in September is calculated to a hot 92.1°F (33.4°C). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
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 'felt air temperature', 'feels like', 'real feel', or 'apparent temperature', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. This effect is individual, with diverse people perceiving weather differently for numerous reasons (pregnancy, clothing, differences in body mass, height, and shape), and activity. 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.

Humidity

In Huntsville, the average relative humidity is 74.5%.

Rainfall

In Huntsville, it is raining for 7.5 days, with typically 3.7" (94.5mm) of accumulated precipitation. Throughout the year, in Huntsville, there are 116.5 rainfall days, and 54.3" (1378.6mm) of precipitation is accumulated.

Snowfall

April through November are months without snowfall in Huntsville.

Daylight

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

Sunshine

In September, the average sunshine in Huntsville, Alabama, is 7h.

UV index

In Huntsville, Alabama, the average daily maximum UV index in September is 8. A UV Index reading of 8 to 10 represents a very high threat to health from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 8 transform into the following instructions:
Take extra precautions. Protection against sun damage is required. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.

What is the temperature in September in Huntsville?

The average high-temperature, in September, is 84°F (28.9°C), while the average low-temperature is 61.7°F (16.5°C). The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), that combines relative humidity and air temperature, in September is estimated at 92.1°F (33.4°C).

What is the average humidity in September in Huntsville?

In Huntsville, the average relative humidity in September is 74.5%.

How much does it rain in Huntsville in September?

In Huntsville, during September, the rain falls for 7.5 days and regularly aggregates up to 3.7" (94.5mm) of precipitation.

When it does not snow in Huntsville?

In Huntsville snow does not fall in April through November.

How many hours of daylight does Huntsville have in September?

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

How long on average sun shines in September in Huntsville?

In Huntsville, Alabama, the average sunshine in September is 7h.

How high is the UV index in September in Huntsville?

The average daily maximum UV index in September in Huntsville is 8. A UV Index estimate of 8 to 10 represents a very high health threat from the exposure to the Sun's UV radiation.
Average temperature in September - Huntsville, AL
  • Average high temperature in September: 84°F

The warmest month (with the highest average high temperature) is August (89.9°F).
The month with the lowest average high temperature is January (50.1°F).

  • Average low temperature in September: 61.7°F

The month with the highest average low temperature is July (69.7°F).
The coldest month (with the lowest average low temperature) is January (31°F).

Average humidity in September - Huntsville, AL
  • Average humidity in September: 74.5%

The month with the highest relative humidity is August (76%).
The month with the lowest relative humidity is January (56.5%).

Average rainfall in September - Huntsville, AL
  • Average rainfall in September: 3.7"

The wettest month (with the highest rainfall) is December (5.8").
Driest months (with the lowest rainfall) are August and October (3.6").

Average rainfall days in September - Huntsville, AL
  • Average rainfall days in September: 7.5 days

The month with the highest number of rainy days is December (10.8 days).
The month with the lowest number of rainy days is September (7.5 days).

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

The month with the highest snowfall is January (1.3").
Months with the lowest snowfall are April, May, June, July, August, September, October and November (0").

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

The month with the highest number of snowfall days is January (0.9 days).
Months with the lowest number of snowfall days are April, May, June, July, August, September, October and November (0 days).

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

The month with the longest days is June (Average daylight: 14.5h).
The month with shortest days is December (Average daylight: 9.9h).

  • Average sunshine in September: 7h

Months with most sunshine are May, June and July (Average sunshine: 9h).
Months with least sunshine are January, February, November and December (Average sunshine: 5).

Average UV index in September - Huntsville, AL
  • Average UV index in September: 8

Months with the highest UV index are June and July (UV index 10).
Months with the lowest UV index are January, November and December (UV index 3).