September weather forecast
Baton Rouge, LA

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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

With the arrival of September, Baton Rouge begins its transition from summer to fall. The city witnesses a trickle of improved weather as temperatures slowly decline. The daily hours of sunshine stabilize at around 9.5 hours, still leaving Baton Rouge with plenty of daylight. The abating heat from the summer months presents September with a marginally reduced relative humidity. Baton Rouge welcomes a steady wind speed of 4.6mph (7.4km/h), offering slight respite from the receding heat.

Temperature

The shift to September in Baton Rouge signals an average high-temperature of a still tropical 88°F (31.1°C), subtly varied from August's 91.9°F (33.3°C). An average low-temperature of 70°F (21.1°C) marks the month of September.

Heat index

The average heat index in September is computed to be a scorching 105.8°F (41°C). Incorporate additional safety actions, heat cramps and heat exhaustion are possible. Long-term activity may induce heatstroke.
One should be cognizant that the heat index values are tailored for shaded spots and mild winds. A direct sunlight exposure may boost the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', shows a temperature sensation when both heat and moisture conditions are combined. A person's impression of weather can be affected by numerous aspects, among them metabolic variations, pregnancy, and activity levels. When directly under the sun, the weather's impact can intensify, possibly boosting the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Typically, young kids are at a higher risk than adults since they sweat less. Also, the larger skin surface in proportion to their small bodies and the heightened heat production due to their active nature adds to their vulnerability.
Perspiring is the body's way of cooling down, particularly by allowing sweat to evaporate and take the heat with it. Greater relative humidity lessens the rate of evaporation, thus decreasing the body's heat dispersal, which gives rise to a sensation 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

The average relative humidity in September in Baton Rouge is 78%.

Rainfall

In September, the rain falls for 17.6 days. Throughout September, 2.95" (75mm) of precipitation is accumulated. 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 in Baton Rouge.

Daylight

In September, the average length of the day in Baton Rouge is 12h and 20min.
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 6:50 pm CDT.

Sunshine

The average sunshine in September in Baton Rouge is 9.5h.

UV index

In September, the average daily maximum UV index in Baton Rouge is 6. A UV Index of 6 to 7 symbolizes a high health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The maximum daily UV index of 6 during September translates into the following directions:
Eschew overexposure. Those with light skin may suffer burns in fewer than 20 minutes. The Sun's UV radiation is most potent between 10 a.m. and 4 p.m. Try to limit direct exposure to the Sun during this period. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses.
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Frequently asked questions

How hot is September in Baton Rouge?

During September, Baton Rouge experiences an average high-temperature of 88°F (31.1°C) and a low-temperature of 70°F (21.1°C). In September, the average heat index (a.k.a. 'felt air temperature', 'feels like'), which factors the actual air temperature with the relative humidity, 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 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.

What is the average length of the day in September in Baton Rouge?

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

When is the sunrise / sunset in September in Baton Rouge?

On the first day of September in Baton Rouge, 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 6:50 pm CDT.

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

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

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

The average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's 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
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 2min

The month with the longest days is June (Average daylight: 14h and 6min).
The month with the shortest days is December (Average daylight: 10h and 12min).

  • Average sunshine in September: 9h and 3min

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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Baton Rouge, Louisiana, USA

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