Baton Rouge
Louisiana, USA
Long-term weather forecast
Long-term weather forecast

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
The first month of the autumn, September, is also a hot month in Baton Rouge, Louisiana, with average temperature varying between 88.7°F (31.5°C) and 68.5°F (20.3°C).

Temperature

In September, the average high-temperature is practically the same as in August - a still tropical 88.7°F (31.5°C). In September, the average low-temperature is 68.5°F (20.3°C).

Heat index

The average heat index in September is calculated to a scorching 106.9°F (41.6°C). Be wary - heat exhaustion and heat cramps are highly anticipated. With continued activity, heatstroke is very likely.
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 'real feel', 'felt air temperature', 'feels like', or 'apparent temperature', is a measure that combines both air temperature and relative humidity into a single value that indicates how hot the weather feels. Additional factors like pregnancy, metabolic differences, clothing, and activity influence one's weather impression. Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, 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. Under high air temperature and humidity (high heat index) conditions, perspiration is limited, and the perception of heat is increased. 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 Baton Rouge, Louisiana, the average relative humidity is 77.5%.

Rainfall

In Baton Rouge, during 8.5 rainfall days, 4.5" (115.3mm) of precipitation is typically accumulated. Throughout the year, there are 112.8 rainfall days, and 60.6" (1540.4mm) of precipitation is accumulated.

Snowfall

In Baton Rouge snow does not fall in January, March through December.

Daylight

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

Sunshine

In September, the average sunshine in Baton Rouge is 8h.

UV index

The average daily maximum UV index in September is 9. A UV Index value of 8 to 10 symbolizes a very high health vulnerability from unsafe exposure to the UV radiation for the ordinary person.
Note: The average daily UV index of 9 transform into the following instructions:
Take extra precautions. Fair-skinned individuals may get burned in less than 10 minutes. 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. A broad-spectrum sunscreen of SPF 30+ should be liberally applied and re-applied every two hours, and immediately after an outdoor workout or a swim.

What is the temperature in September in Baton Rouge?

In September, in Baton Rouge, Louisiana, the average high-temperature is 88.7°F (31.5°C), and the average low-temperature is 68.5°F (20.3°C). In September, the average heat index (a.k.a. 'felt air temperature', 'real feel'), that represents influence of the relative humidity to air temperaure, is estimated at 106.9°F (41.6°C).

What is the average humidity in September in Baton Rouge?

In Baton Rouge, Louisiana, the average relative humidity in September is 77.5%.

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

In Baton Rouge, in September, it is raining for 8.5 days, with typically 4.5" (115.3mm) of accumulated precipitation.

When it does not snow in Baton Rouge?

In Baton Rouge snow does not fall in January, March through December.

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

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

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

In Baton Rouge, the average sunshine in September is 8h.

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

The average daily maximum UV index in September in Baton Rouge, Louisiana, is 9. A UV Index reading of 8 to 10 represents a very high hazard to health from the exposure to the Sun's UV rays.
Average temperature in September - Baton Rouge, LA
  • Average high temperature in September: 88.7°F

The warmest month (with the highest average high temperature) is August (92.5°F).
The month with the lowest average high temperature is January (62.3°F).

  • Average low temperature in September: 68.5°F

The month with the highest average low temperature is July (73.7°F).
The coldest month (with the lowest average low temperature) is January (41.2°F).

Average humidity in September - Baton Rouge, LA
  • Average humidity in September: 77.5%

The month with the highest relative humidity is August (78%).
The month with the lowest relative humidity is January (62%).

Average rainfall in September - Baton Rouge, LA
  • Average rainfall in September: 4.5"

The wettest month (with the highest rainfall) is June (6.4").
The driest month (with the lowest rainfall) is November (4.1").

Average rainfall days in September - Baton Rouge, LA
  • Average rainfall days in September: 8.5 days

The month with the highest number of rainy days is July (12.9 days).
Months with the lowest number of rainy days are April and October (7.5 days).

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

The month with the highest snowfall is February (0.2").
Months with the lowest snowfall are January, March, April, May, June, July, August, September, October, November and December (0").

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 shortest days is December (Average daylight: 10.2h).

  • Average sunshine in September: 8h

Months with most sunshine are May, June and July (Average sunshine: 9h).
Months with least sunshine are January and December (Average sunshine: 5).

Average UV index in September - Baton Rouge, LA
  • Average UV index in September: 9

Months with the highest UV index are June and July (UV index 11).
Months with the lowest UV index are January and December (UV index 4).