September weather forecast
Metairie, LA

In September, Metairie begins its transition from the scorching summer towards a milder autumn. The temperature, after prolonged summer heat, takes a dive returning to the more desirable 80s°F. Rainfall and humidity begin to level off, yet they continue to influence the weather significantly. The shift towards autumn heralds a reduction in the duration of daylight hours, signaling shorter days ahead. Despite this transition, the frequency of sunshine continues on its summer trend, with an average of 10.2 hours per day.

Temperature

As August transitions into September, the average high-temperature in Metairie rests at a still tropical 86.5°F (30.3°C), maintaining a close resemblance to the previous month. Metairie, in September, experiences an average temperature of 75.2°F (24°C) at night.

Heat index

The average heat index in September is calculated to be a fiery hot 98.6°F (37°C). Heightened precautions are necessary, heat cramps and heat exhaustion are potential risks. Continuous activity could lead to heatstroke.
Note that heat index values are valued for light wind and location in the shade. Exposure to the direct sun could elevate the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'feels like', is an aggregate value of air's warmth and moisture to show the human-felt temperature. One's perception of temperature is subjective, varying based on their activity and individual heat perception, influenced by factors like wind, clothing, and metabolic variations. Direct sun exposure is noteworthy in its ability to escalate the felt temperature, potentially adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are highly critical for babies and toddlers. Children often miss understanding the importance of rest and rehydration. Thirst usually appears late during dehydration - therefore, maintaining hydration, particularly during long physical activities, is essential.
The physiological way the human body responds to excessive heat is by inducing perspiration, using sweat evaporation as a cooling mechanism. 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. As the body accumulates more heat than it can release, body temperature goes up, increasing the risk of heat-related health issues.

Humidity

The average relative humidity in September is 74%.

Rainfall

In Metairie, in September, during 10.9 rainfall days, 0.43" (11mm) of precipitation is typically accumulated. In Metairie, during the entire year, the rain falls for 104.1 days and collects up to 8.39" (213mm) of precipitation.

Daylight

In Metairie, Louisiana, the average length of the day in September is 12h and 20min.
On the first day of the month, sunrise is at 6:38 am and sunset at 7:22 pm. On the last day of September, sunrise is at 6:53 am and sunset at 6:46 pm CDT.

Sunshine

The average sunshine in September in Metairie is 10.2h.

UV index

The months with the highest UV index in Metairie are May through September, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high threat to health from exposure to the Sun's UV rays for the average person.
Note: The maximum daily UV index of 7 during September translates into the following directions:
Act on precautions and pay attention to sun safety recommendations. Avoidance of sunburn is obligatory. Try to minimize direct Sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation. Also note that objects like parasols or canopies might not provide complete sun protection. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage.