September weather forecast
Lafayette, LA

Relief from the heat begins in September as Lafayette, Louisiana starts moving towards fall. Post the extreme heat in August, the temperatures drop providing residents with a glimpse of the forthcoming autumn season. As the city bids goodbye to the scorching summers, the frequency of rainfall reduces. Despite the changing season, occasional spells of sunshine continue to adorn September, thus adding more character to the season. Typically, this month bridges the hot summer and the cool autumn, offering a blend of weather patterns.

Temperature

September's presence in Lafayette records an average high-temperature of a still tropical 86.7°F (30.4°C), closely mirroring August's climate. Lafayette records an average low-temperature of 70.5°F (21.4°C) throughout the month of September.

Heat index

Throughout September, the heat index is evaluated at a torrid 102.2°F (39°C). Greater safety measures are needed, risk of heat exhaustion and heat cramps is high. Continuous activity might trigger heatstroke.
Heat index values are typically calculated for conditions of shade and a light breeze. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', gauges the sensation of temperature factoring in the air's moisture content. Elements such as metabolic variations, being pregnant, and physical activity can impact one's weather perception. It is noteworthy to mention that direct sunlight exposure can augment the felt temperature, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for children. Youngsters generally face more threats than adults given their lesser ability to sweat. Coupled with their larger skin surface relative to their small bodies and higher heat production due to their activities, they are more endangered.
The body's innate mechanism to counteract overheating is through perspiration, as it leverages the cooling effects of sweat evaporation. When relative humidity is at high levels, the evaporation rate lessens, causing the body to keep more heat than it would in less humid conditions. As body temperatures escalate without effective heat release, one might face dehydration threats.

Humidity

The average relative humidity in September is 79%.

Rainfall

In Lafayette, during September, the rain falls for 14.9 days and regularly aggregates up to 1.38" (35mm) of precipitation. Throughout the year, there are 143.3 rainfall days, and 17.91" (455mm) of precipitation is accumulated.

Snowfall

February through December are months without snowfall in Lafayette.

Daylight

In Lafayette, the average length of the day in September is 12h and 20min.
On the first day of the month, sunrise is at 6:45 am and sunset at 7:30 pm. On the last day of September, sunrise is at 7:01 am and sunset at 6:54 pm CDT.

Sunshine

In Lafayette, the average sunshine in September is 9.9h.

UV index

In September, the average daily maximum UV index is 6. A UV Index of 6 to 7 symbolizes a high health risk from unsafe exposure to UV radiation for average individuals.
Note: A maximum daily UV index of 6 during September morphs into the following directions:
Inhibit overexposure. Warding off sun damage is of utmost importance. Stay in the shade and limit direct Sun exposure from 10 a.m. to 4 p.m., a time when UV radiation is particularly strong. Remember, however, that shade structures may not provide complete protection. To cut down UV radiation exposure by about half, sport a wide-brim hat.