September weather forecast and climate
Opp, AL

Weather in September

September, the first month of the autumn, in Opp, is still a tropical month, with average temperature fluctuating between 86.9°F (30.5°C) and 68.9°F (20.5°C).

Temperature

In Opp, the average high-temperature is essentially the same as in August - a still hot 86.9°F (30.5°C). In Opp, the average low-temperature is 68.9°F (20.5°C).

Heat index

In September, the average heat index is calculated to a torrid 99.3°F (37.4°C). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Note that heat index values are valued for light wind and location in the shade. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature', 'real feel', 'felt air temperature', or 'feels like', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (differences in body mass, height, and shape, clothing, pregnancy). Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. 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.
The human body normally cools itself by perspiration. Excessive warmth is eliminated from the body by evaporation of sweat. Under high air temperature and humidity (high heat index) conditions, perspiration is limited, and the perception of heat is increased. If the body can not disperse the excessive heat and body temperature reaches conditions of hyperthermia, above 99.5°F (37.5°C) to 100.9°F (38.3°C), thermal conditions are potentially life-threatening.

Humidity

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

Rainfall

In Opp, during 17.2 rainfall days, 2.64" (67mm) of precipitation is typically accumulated. Throughout the year, there are 178.2 rainfall days, and 36.1" (917mm) of precipitation is accumulated.

Snowfall

In Opp, Alabama, snow does not fall in March through December.

Daylight

In September, the average length of the day in Opp is 12.3h.

Sunshine

In September, the average sunshine in Opp is 9h.

UV index

The average daily maximum UV index in Opp is 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from the exposure to the Sun's UV radiation for average individuals.
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. 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.
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FAQ

What is the temperature in September in Opp?

In September, in Opp, Alabama, the average high-temperature is 86.9°F (30.5°C), and the average low-temperature is 68.9°F (20.5°C). In September, the average heat index (a.k.a. 'real feel', 'felt air temperature'), that calculates temperature value influenced by the moisture in the air, is evaluated at 99.3°F (37.4°C).

What is the average humidity in September in Opp?

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

How much does it rain in Opp in September?

In Opp, in September, it is raining for 17.2 days, with typically 2.64" (67mm) of accumulated precipitation.

When it does not snow in Opp?

March through December are months without snowfall in Opp.

How many hours of daylight does Opp have in September?

In September, the average length of the day is 12.3h.

How many hours of sunshine does Opp have in September?

In Opp, the average sunshine in September is 9h.

What is the UV index reading in September in Opp?

In September, the average daily maximum UV index in Opp, Alabama, is 6. A UV Index reading of 6 to 7 represents a high hazard to health from unprotected exposure to the UV radiation.

Average temperature in September
Opp, AL

Average temperature in September - Opp, AL
  • Average high temperature in September: 86.9°F

The warmest month (with the highest average high temperature) is July (91.2°F).
The month with the lowest average high temperature is January (57.9°F).

  • Average low temperature in September: 68.9°F

Months with the highest average low temperature are July and August (73°F).
The coldest month (with the lowest average low temperature) is January (40.8°F).

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Average pressure in September
Opp, AL

Average pressure in September - Opp, AL
  • Average pressure in September: 29.98"

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
Opp, AL

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

The windiest month (with the highest average wind speed) is January (7.1mph).
The calmest month (with the lowest average wind speed) is August (4.7mph).

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Average humidity in September
Opp, AL

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

The month with the highest relative humidity is December (77%).
The month with the lowest relative humidity is October (70%).

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Average rainfall in September
Opp, AL

Average rainfall in September - Opp, AL
  • Average rainfall in September: 2.64"

The wettest month (with the highest rainfall) is August (4.84").
The driest month (with the least rainfall) is November (2.09").

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Average rainfall days in September
Opp, AL

Average rainfall days in September - Opp, AL
  • Average rainfall days in September: 17.2 days

The month with the highest number of rainy days is July (24.8 days).
The month with the least rainy days is November (8 days).

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Average snowfall in September
Opp, AL

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

The month with the highest snowfall is February (0.16").
Months with the least snowfall are March, April, May, June, July, August, September, October, November and December (0").

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Average snowfall days in September
Opp, AL

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

The month with the highest number of snowfall days is January (0.4 days).
Months with the least snowfall days are April, May, June, July, August, September, October and November (0 days).

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

Average daylight in September / Average sunshine in September - Opp, AL
  • Average daylight in September: 12.3h

The month with the longest days is June (Average daylight: 14.2h).
The month with the shortest days is December (Average daylight: 10.1h).

  • Average sunshine in September: 9h

The month with the most sunshine is June (Average sunshine: 10.9h).
Months with the least sunshine are February and December (Average sunshine: 5.3).

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Average sunshine days in September
Opp, AL

Average sunshine days in September - Opp, AL
  • Average sunshine days in September: 10.3 days

The month with the most sunshine days is November (20.6 days).
The month with the least sunshine days is July (4.4 days).

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Average UV index in September
Opp, AL

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

Months with the highest UV index are May, 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
Opp, AL

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

The month with the most cloud cover is December (Cloud cover 45).
The month with the least cloud cover is October (Cloud cover 27).

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Average visibility in September
Opp, AL

Average visibility in September - Opp, 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).

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