September weather forecast
Alton, AL

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Weather in September

September, the first month of the autumn in Alton, is also a moderately hot month, with temperature in the range of an average low of 64.6°F (18.1°C) and an average high of 84.7°F (29.3°C).

Temperature

With the advent of September, Alton's high-temperatures adjust to a moderately hot 84.7°F (29.3°C), closely aligning with the preceding month. An average low-temperature of 64.6°F (18.1°C) is observed during September nights.

Heat index

During September, the heat index is appraised at a hot 93.2°F (34°C). Incorporate additional preventive steps, heat exhaustion and heat cramps are possible. Long-lasting activity may cause heatstroke.
Remember that heat index calculations are made for conditions in the shade with light wind. The heat index has the possibility to be enhanced by 15 Fahrenheit (8 Celsius) degrees when there is direct sun exposure.
Note: The heat index, also known as 'real feel' or 'feels like', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. Physical activity, clothing, and metabolic variations are additional factors that impact an individual's perception of temperature. It is essential to realize that direct sunlight can escalate the perceived temperature, increasing the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. In general, younger individuals are at greater risk than adults because they tend to sweat less. Also, having a larger skin surface to body size ratio and greater heat production due to their active behavior contribute to this danger.

Humidity

In Alton, the average relative humidity in September is 74%.

Rainfall

In September, the rain falls for 12.1 days. Throughout September, 1.14" (29mm) of precipitation is accumulated. In Alton, during the entire year, the rain falls for 149 days and collects up to 19.88" (505mm) of precipitation.

Snowfall

In Alton, Alabama, snow does not fall in April through October.

Daylight

In Alton, the average length of the day in September is 12h and 22min.
On the first day of the month, sunrise is at 6:21 am and sunset at 7:11 pm. On the last day of September, in Alton, sunrise is at 6:40 am and sunset at 6:31 pm CDT.

Sunshine

In Alton, the average sunshine in September is 8.8h.

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 unprotected exposure to Sun's UV rays for average individuals.
Note: A maximum high daily UV index of 5 during September translates into the following directions:
Ensure safety - Imperative it is to shield skin and eyes from damage. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear.
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Frequently asked questions

How hot does it get in Alton in September?

September temperatures in Alton vary between a high-temperature of 84.7°F (29.3°C) and a low-temperature of 64.6°F (18.1°C). The average heat index (a.k.a. 'real feel', 'feels like'), which represents the influence of relative humidity on air temperature, in September is appraised at 93.2°F (34°C).

What is the average humidity in September in Alton?

The average relative humidity in September in Alton is 74%.

How much does it rain in Alton in September?

In Alton, in September, it is raining for 12.1 days, with typically 1.14" (29mm) of accumulated precipitation.

When it does not snow in Alton?

In Alton, snow does not fall in April through October.

How many hours of daylight does Alton have in September?

In September, the average day length in Alton, Alabama, is 12h and 22min.

What time are sunrise and sunset in September in Alton?

In September, on the first day of the month, sunrise is at 6:21 am and sunset at 7:11 pm. On the last day of the month, in Alton, Alabama, sunrise is at 6:40 am and sunset at 6:31 pm CDT.

How many hours of sunshine does Alton have in September?

In September, the average sunshine duration is 8.8h.

What is the UV index intensity in September in Alton?

In Alton, Alabama, the average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a moderate health threat from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Alton, AL

Average temperature in September - Alton, AL
  • Average high temperature in September: 84.7°F

The warmest month (with the highest average high temperature) is July (90.1°F).
The month with the lowest average high temperature is January (50.7°F).

  • Average low temperature in September: 64.6°F

The month with the highest average low temperature is July (70.3°F).
The coldest month (with the lowest average low temperature) is January (34.9°F).

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Average pressure in September
Alton, AL

Average pressure in September - Alton, AL
  • Average pressure in September: 30.01"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).

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Average wind speed in September
Alton, AL

Average wind speed in September - Alton, AL
  • Average wind speed in September: 4.8mph

The windiest months (with the highest average wind speed) are January and February (7.4mph).
The calmest months (with the lowest average wind speed) are July and August (4.3mph).

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Average humidity in September
Alton, AL

Average humidity in September - Alton, AL
  • Average humidity in September: 74%

The month with the highest relative humidity is December (80%).
The month with the lowest relative humidity is October (72%).

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Average rainfall in September
Alton, AL

Average rainfall in September - Alton, AL
  • Average rainfall in September: 1.14"

The wettest month (with the highest rainfall) is August (2.24").
The driest month (with the least rainfall) is October (1.06").

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Average rainfall days in September
Alton, AL

Average rainfall days in September - Alton, AL
  • Average rainfall days in September: 12.1 days

The month with the highest number of rainy days is July (18.6 days).
The month with the least rainy days is November (7.9 days).

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Average snowfall in September
Alton, AL

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

The month with the highest snowfall is January (0.2").
The months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days in September
Alton, AL

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

The month with the highest number of snowfall days is February (1 days).
The 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
Alton, AL

Average daylight in September / Average sunshine in September - Alton, AL
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).

  • Average sunshine in September: 8h and 5min

The months with the most sunshine are June and July (Average sunshine: 10h and 36min).
The months with the least sunshine are February and December (Average sunshine: 4h and 48min).

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Average sunshine days in September
Alton, AL

Average sunshine days in September - Alton, AL
  • Average sunshine days in September: 15.5 days

The month with the most sunshine days is November (20.6 days).
The month with the least sunshine days is July (9.6 days).

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Average UV index in September
Alton, AL

Average UV index in September - Alton, 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).

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Average cloud cover in September
Alton, AL

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

The month with the most cloud cover is February (Cloud cover 48).
The months with the least cloud cover are June and September (Cloud cover 30).

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Average visibility in September
Alton, AL

Average visibility in September - Alton, 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).

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Alton, Alabama, USA

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