September weather forecast and climate
Dayton, AL

September, the first month of the autumn, in Dayton, is also a hot month, with average temperature ranging between max 88°F (31.1°C) and min 67.1°F (19.5°C).

Temperature

In September, the average high-temperature is almost the same as in August - a still hot 88°F (31.1°C). In Dayton, the average low-temperature is 67.1°F (19.5°C).

Heat index

In September, the average heat index is evaluated at a sweltering 101.3°F (38.5°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. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel', 'felt air temperature', 'feels like', or 'apparent temperature', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. Additional factors like metabolic differences, wind, differences in body mass, height, and shape, and activity influence one's weather impression. 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.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. 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 September is 72%.

Rainfall

September is the month with the least rainfall in Dayton, Alabama. Rain falls for 13.3 days and accumulates 2.01" (51mm) of precipitation.

Snowfall

In Dayton snow does not fall in March through November.

Daylight

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

Sunshine

The average sunshine in Dayton is 9.3h.

UV index

In Dayton, the average daily maximum UV index in September is 6. A UV Index reading of 6 to 7 represents a high health vulnerability from unsafe exposure to the UV radiation for the average person.
Note: The average daily UV index of 6 transform into the following instructions:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. 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. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.

What is the temperature in September in Dayton?

In September, in Dayton, the average high-temperature is 88°F (31.1°C), and the average low-temperature is 67.1°F (19.5°C). The average heat index (a.k.a. 'feels like', 'felt air temperature'), that combines air temperature and relative humidity, in September is appraised at 101.3°F (38.5°C).

What is the average humidity in September in Dayton?

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

How many days does it rain in September in Dayton?

In September, in Dayton, Alabama, the rain falls for 13.3 days. Throughout September, 2.01" (51mm) of precipitation is accumulated.

What is the driest month in Dayton?

September is the month with the least rainfall in Dayton, Alabama. Rain falls for 13.3 days and accumulates 2.01" (51mm) of precipitation.

When it does not snow in Dayton?

March through November are months without snowfall in Dayton, Alabama.

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

The average length of the day in September is 12.4h.

How long on average sun shines in September in Dayton?

In September, the average sunshine in Dayton is 9.3h.

What is the UV index intensity in September in Dayton?

In Dayton, the average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high hazard to health from the exposure to the Sun's UV radiation.
Average temperature in September - Dayton, AL
  • Average high temperature in September: 88°F

The warmest month (with the highest average high temperature) is July (92.7°F).
The month with the lowest average high temperature is January (55°F).

  • Average low temperature in September: 67.1°F

The month with the highest average low temperature is July (72.5°F).
The coldest month (with the lowest average low temperature) is January (38.5°F).

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

The month with the highest atmospheric pressure is January (30.16").
The month with the lowest atmospheric pressure is June (29.96").

Average wind speed in September - Dayton, AL
  • Average wind speed in September: 5mph

The windiest months (with the highest average wind speed) are January, February, March and April (7mph).
The calmest months (with the lowest average wind speed) are July and August (4.5mph).

Average humidity in September - Dayton, 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%).

Average rainfall in September - Dayton, AL
  • Average rainfall in September: 2.01"

The wettest month (with the highest rainfall) is December (3.5").
The driest month (with the least rainfall) is September (2.01").

Average rainfall days in September - Dayton, AL
  • Average rainfall days in September: 13.3 days

The month with the highest number of rainy days is July (21.3 days).
The month with the least rainy days is November (8.3 days).

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

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

Average snowfall days in September - Dayton, 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).

Average daylight in September / Average sunshine in September - Dayton, 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: 10.1h).

  • Average sunshine in September: 9.3h

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

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

The month with the most sunshine days is October (21.2 days).
The month with the least sunshine days is July (8.3 days).

Average UV index in September - Dayton, 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).

Average cloud cover in September - Dayton, AL
  • Average cloud cover in September: 29

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 29).

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

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