September weather forecast
New Orleans, LA

September in New Orleans rings the curtain down on summer, ushering in the beginnings of mild autumn weather. The temperature undergoes a slight drop from the summer zenith, making the city's climate more bearable. Although precipitation drops compared to August, the September skies remain relatively clear, offering generous sunlight. The gradual transition to a cooler October indicates a marked change in weather conditions. Despite these shifts, September maintains a balmy aura, releasing the summer's hold incrementally.

Temperature

New Orleans's weather in September indicates an average high-temperature of a still hot 86.5°F (30.3°C), nearly consistent with the 89.4°F (31.9°C) of August. In the month of September, the temperature generally rests at an average low of 76.3°F (24.6°C).

Heat index

The average heat index in September is estimated at a torrid 98.6°F (37°C). Implement more safety precautions, heat cramps and heat exhaustion may happen. Persistent activity could induce heatstroke.
It is emphasized that the heat index's values are meant for shaded zones with mild winds. A rise of up to 15 Fahrenheit (8 Celsius) degrees in the heat index could result from direct sunlight.
Note: The heat index, also known as 'feels like' or 'apparent temperature', is a numerical representation of warmth when taking temperature and moisture levels into account. Additional elements including metabolic differences, the level of physical activity, and attire have a role in shaping the individual's temperature perception. Direct exposure to sun rays can potentially augment the heat sensation, elevating the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Young people are generally more susceptible than adults because they perspire less. Furthermore, their proportionally larger skin surface to their petite bodies and the increased heat output from their actions add to the risk.
Perspiration is the body's default response to elevated temperatures, as it promotes the evaporation of sweat to achieve cooling. With an abundance of moisture present in the air, the process of evaporation becomes less effective, and the body fails to cool down as it should, leading to the sensation of overheating. When the body is unable to balance heat gain, its temperature elevates, which may induce thermal illnesses.

Humidity

In September, the average relative humidity is 73%.

Rainfall

In New Orleans, in September, during 11.7 rainfall days, 0.47" (12mm) of precipitation is typically accumulated. Throughout the year, in New Orleans, there are 112.1 rainfall days, and 9.37" (238mm) of precipitation is accumulated.

Snowfall

February through December are months without snowfall.

Daylight

In New Orleans, the average length of the day in September is 12h and 20min.
On the first day of September in New Orleans, sunrise is at 6:37 am and sunset at 7:22 pm. On the last day of the month, sunrise is at 6:53 am and sunset at 6:46 pm CDT.

Sunshine

In New Orleans, the average sunshine in September is 10.1h.

UV index

The months with the highest UV index are May through September, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV radiation for average individuals.
Note: In September, the maximum UV index of 7 suggests this advice:
Beware of overexposure. Fair-skinned individuals risk burning in less than 20 minutes. Stay in the shade and limit direct sun exposure between 10 a.m. and 4 p.m., when UV radiation is at its strongest. Remember, however, that not all shade structures provide full sun protection. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection.