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 still a tropical month in Baton Rouge, Louisiana, with average temperature ranging between min 70°F (21.1°C) and max 88°F (31.1°C).

Temperature

In September, the average high-temperature is practically 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

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.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With the 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 'felt air temperature', 'apparent temperature', 'feels like', or 'real feel', is a measure of how hot it feels when the actual air humidity is factored in. This effect is individual, with diverse people perceiving weather differently for numerous reasons (pregnancy, clothing, metabolic differences), and activity. 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 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.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. 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. 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

The average relative humidity in September is 78%.

Rainfall

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

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

Sunshine

In September, the average sunshine is 9.5h.

UV index

In September, the average daily maximum UV index is 6. A UV Index of 6 to 7 symbolizes a high threat to health from the exposure to the Sun's UV radiation for the ordinary person.
Note: In September, the average maximum UV index of 6 translate into the following recommendations:
Take precautions and utilize sun safety practices. Protection against the skin and eye damage is required. 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. 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.

What is the temperature in September in Baton Rouge?

The average high-temperature, in September, in Baton Rouge, 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. 'real feel', 'apparent temperature'), that takes the relative humidity and factores it into the air temperature reading, is estimated at 104.9°F (40.5°C).

What is the average humidity in September in Baton Rouge?

The average relative humidity in September is 78%.

How much does it rain in Baton Rouge in September?

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?

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

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

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?

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

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

In Baton Rouge, Louisiana, the average daily maximum UV index in September is 6. A UV Index of 6 to 7 symbolizes a 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: 31.1°C

Warmest months (with the highest average high temperature) are July and August (33.3°C).
The month with the lowest average high temperature is January (14.8°C).

  • Average low temperature in September: 21.1°C

The month with the highest average low temperature is August (23.3°C).
The coldest month (with the lowest average low temperature) is January (5.8°C).

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%).

Average rainfall in September - Baton Rouge, LA
  • Average rainfall in September: 75mm

The wettest month (with the highest rainfall) is July (120mm).
The driest month (with the lowest rainfall) is November (45mm).

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 lowest number of rainy days is November (8.8 days).

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

The month with the highest snowfall is January (7mm).
Months with the lowest snowfall are February, March, April, May, June, July, August, September, October and November (0mm).

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 lowest number of snowfall days are March, April, May, June, July, August, September, October and November (0 days).

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: 9.5h

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

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).