September weather forecast
Baton Rouge, LA

Manicured lawns and beautiful trees approaching the State Capitol building in Baton Rouge, Louisiana
Manicured lawns and beautiful trees approaching the State Capitol building in Baton Rouge, Louisiana

Weather in September

The first month of the autumn, September, is still a hot month in Baton Rouge, Louisiana, with temperature in the range of an average low of 70°F (21.1°C) and an average high of 88°F (31.1°C).

Temperature

In September, the average high-temperature is almost the same as in August - a still hot 88°F (31.1°C). The average low-temperature, in September, is 70°F (21.1°C).

Heat index

In September, the average heat index is computed to be an extremely hot 105.8°F (41°C). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Note that heat index values are valued for light wind and location in the shade. With 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', 'real feel', 'felt air temperature', 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, pregnancy, clothing, and activity influence one's weather impression. 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 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.
The human body cools itself through perspiration, as excessive warmth is removed from the body through sweat evaporation. A higher relative humidity affects normal body cooling by reducing the evaporation rate, subsequently lowering the rate at which the body cools and increasing the perception of heat. 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

In September, the average relative humidity in Baton Rouge is 78%.

Rainfall

In Baton Rouge, in September, it is raining for 17.6 days, with typically 2.95" (75mm) of accumulated precipitation. Throughout the year, in Baton Rouge, Louisiana, there are 177.1 rainfall days, and 36.1" (917mm) of precipitation is accumulated.

Snowfall

February through November are months without snowfall.

Daylight

In September, the average length of the day is 12h and 20min.
On the first day of September, sunrise is at 6:41 am and sunset at 7:27 pm. On the last day of the month, sunrise is at 6:57 am and sunset at 6:51 pm CDT.

Sunshine

In Baton Rouge, the average sunshine in September is 9.5h.

UV index

In September, the average daily maximum UV index in Baton Rouge is 6. A UV Index value of 6 to 7 symbolizes a high threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: In September, the average maximum UV index of 6 translate into the following recommendations:
Take precautions against overexposure. Protection against sun damage is needed. 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 Baton Rouge?

The average high-temperature, in September, in Baton Rouge, Louisiana, is 88°F (31.1°C), while the average low-temperature is 70°F (21.1°C). The average heat index (a.k.a. 'real feel', 'apparent temperature'), which combines relative humidity and air temperature, in September is computed to be 105.8°F (41°C).

What is the average humidity in September in Baton Rouge?

In September, the average relative humidity in Baton Rouge, Louisiana, is 78%.

How many days does it rain in September in Baton Rouge?

In Baton Rouge, Louisiana, in September, during 17.6 rainfall days, 2.95" (75mm) of precipitation is typically accumulated.

When it does not snow in Baton Rouge?

February through November are months without snowfall in Baton Rouge, Louisiana.

How many hours of daylight does Baton Rouge have in September?

In September, the average day length is 12h and 20min.

What time are sunrise and sunset in September in Baton Rouge?

On the first day of September in Baton Rouge, Louisiana, sunrise is at 6:41 am and sunset at 7:27 pm. On the last day of the month, sunrise is at 6:57 am and sunset at 6:51 pm CDT.

How many hours of sunshine does Baton Rouge have in September?

In September, the average sunshine duration in Baton Rouge is 9.5h.

What is the UV index intensity in September in Baton Rouge?

The average daily maximum UV index in September in Baton Rouge, Louisiana, is 6. A UV Index of 6 to 7 symbolizes a high health threat from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Baton Rouge, LA

Average temperature in September - Baton Rouge, LA
  • Average high temperature in September: 88°F

The warmest months (with the highest average high temperature) are July and August (91.9°F).
The month with the lowest average high temperature is January (58.6°F).

  • Average low temperature in September: 70°F

The month with the highest average low temperature is August (73.9°F).
The coldest month (with the lowest average low temperature) is January (42.4°F).

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Average pressure in September
Baton Rouge, LA

Average pressure in September - Baton Rouge, LA
  • Average pressure in September: 29.97"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The months with the lowest atmospheric pressure are June and August (29.96"Hg).

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Average wind speed in September
Baton Rouge, LA

Average wind speed in September - Baton Rouge, LA
  • Average wind speed in September: 4.6mph

The windiest month (with the highest average wind speed) is February (6.6mph).
The calmest month (with the lowest average wind speed) is July (4.4mph).

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Average humidity in September
Baton Rouge, LA

Average humidity in September - Baton Rouge, LA
  • Average humidity in September: 78%

The month with the highest relative humidity is February (82%).
The month with the lowest relative humidity is October (72%).

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Average rainfall in September
Baton Rouge, LA

Average rainfall in September - Baton Rouge, LA
  • Average rainfall in September: 2.95"

The wettest month (with the highest rainfall) is July (4.72").
The driest month (with the least rainfall) is November (1.77").

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Average rainfall days in September
Baton Rouge, LA

Average rainfall days in September - Baton Rouge, LA
  • Average rainfall days in September: 17.6 days

The month with the highest number of rainy days is July (22.5 days).
The month with the least rainy days is November (8.8 days).

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Average snowfall in September
Baton Rouge, LA

Average snowfall in September - Baton Rouge, LA
  • Average snowfall in September: 0"

The month with the highest snowfall is January (0.28").
The months with the least snowfall are February, March, April, May, June, July, August, September, October and November (0").

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Average snowfall days in September
Baton Rouge, LA

Average snowfall days in September - Baton Rouge, LA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (0.3 days).
The months with the least snowfall days are March, April, May, June, July, August, September, October and November (0 days).

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Average daylight in September /
Average sunshine in September
Baton Rouge, LA

Average daylight in September / Average sunshine in September - Baton Rouge, LA
  • Average daylight in September: 12h and 20min

The month with the longest days is June (Average daylight: 14h and 5min).
The month with the shortest days is December (Average daylight: 10h and 13min).

  • Average sunshine in September: 9h and 30min

The month with the most sunshine is June (Average sunshine: 10h and 12min).
The month with the least sunshine is December (Average sunshine: 5h and 0min).

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Average sunshine days in September
Baton Rouge, LA

Average sunshine days in September - Baton Rouge, LA
  • Average sunshine days in September: 10.4 days

The month with the most sunshine days is November (19.6 days).
The months with the least sunshine days are July and August (7.3 days).

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Average UV index in September
Baton Rouge, LA

Average UV index in September - Baton Rouge, LA
  • Average UV index in September: 6

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

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Average cloud cover in September
Baton Rouge, LA

Average cloud cover in September - Baton Rouge, LA
  • Average cloud cover in September: 34

The months with the most cloud cover are February and December (Cloud cover 50).
The month with the least cloud cover is October (Cloud cover 29).

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Average visibility in September
Baton Rouge, LA

Average visibility in September - Baton Rouge, LA
  • Average visibility in September: 5mi

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

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