September weather forecast and climate
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 tropical month in Baton Rouge, Louisiana, with average temperature varying between 70°F (21.1°C) and 88°F (31.1°C).

Temperature

In Baton Rouge, the average high-temperature in September is practically the same as in August - a still tropical 88°F (31.1°C). In September, the average low-temperature is 70°F (21.1°C).

Heat index

In September, the average heat index is evaluated at an extremely hot 104.9°F (40.5°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. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'apparent temperature', 'feels like', or 'real feel', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (clothing, metabolic differences, wind). 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. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
The human body normally cools itself by perspiration, as evaporated sweat carries heat away from the body. With a lot of moisture in the air, the evaporation process is not as effective, and the body does not cool down as efficiently, creating a perception of overheating. When heat gain exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.

Humidity

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

Rainfall

In Baton Rouge, it is raining for 17.6 days, with typically 2.95" (75mm) of accumulated precipitation. In Baton Rouge, during the entire year, the rain falls for 177.1 days and collects up to 36.1" (917mm) of precipitation.

Snowfall

In Baton Rouge snow does not fall in February through November.

Daylight

The average length of the day in Baton Rouge is 12.3h.

Sunshine

The average sunshine in Baton Rouge is 9.5h.

UV index

The average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high threat to health from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: The daily maximum UV index of 6 in September interpret into the following advice:
Take precautions and utilize sun safety practices. Protection against the skin and eye 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. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the temperature in September in Baton Rouge?

The average high-temperature, in September, is 88°F (31.1°C), while the average low-temperature is 70°F (21.1°C). In September, the average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), that combines relative humidity and air temperature, is estimated at 104.9°F (40.5°C).

What is the average humidity in September in Baton Rouge?

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

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

In Baton Rouge, during September, the rain falls for 17.6 days and regularly aggregates up to 2.95" (75mm) of precipitation.

When it does not snow in Baton Rouge?

February through November are months without snowfall.

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

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

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

In September, the average sunshine is 9.5h.

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

In September, the average daily maximum UV index in Baton Rouge is 6. A UV Index of 6 to 7 symbolizes a high health threat from the exposure to the Sun's UV radiation.

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"

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

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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").
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).
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: 12.3h

The month with the longest days is June (Average daylight: 14.1h).
The month with the shortest days is December (Average daylight: 10.2h).

  • Average sunshine in September: 9.5h

The month with the most sunshine is June (Average sunshine: 10.2h).
The month with the least sunshine is December (Average sunshine: 5h).

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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).
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

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
Baton Rouge, LA

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

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

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

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