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 weather in Lafayette displays an average high-temperature of a still hot 86.7°F (30.4°C), slightly varied from August's 90°F (32.2°C). An average temperature of 70.5°F (21.4°C) marks the nights in Lafayette in September.

Heat index

The heat index value for September is computed to be a torrid 102.2°F (39°C). Take greater precautions, heat exhaustion and heat cramps may be expected. Heatstroke could result from lengthy activity.
Consider that heat index readings are for situations in the shade and light wind. Heat index values might soar by up to 15 Fahrenheit (8 Celsius) degrees with exposure to direct sunshine.
Note: The heat index, also known as 'apparent temperature' or 'real feel', is a metric representing the sensation of warmth when air temperature and moisture come together. The influence of weather is personal, with a diverse population experiencing it differently due to differences in body mass, stature, and degree of activity. Considering the impact of direct sunlight, it's possible for the heat index to surge by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly meaningful for babies and toddlers. Young ones often ignore the need to take a break and drink fluids. Thirst is a late-stage symptom of dehydration - hence, maintaining hydration, particularly during extended physical activities, is crucial.
In the face of high temperatures, the human body's reflex is to perspire, leveraging sweat evaporation for cooling. When relative humidity is on the rise, it curtails evaporation, thereby reducing the heat elimination from the body and causing the feeling of being excessively hot. As body temperatures escalate without effective heat release, one might face dehydration threats.

Humidity

In Lafayette, the average relative humidity in September is 79%.

Rainfall

In September, the rain falls for 14.9 days. Throughout September, 1.38" (35mm) of precipitation is accumulated. 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.

Daylight

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

UV index

In Lafayette, the average daily maximum UV index in September is 6. A UV Index of 6 to 7 symbolizes a high health hazard from unprotected exposure to Sun's UV rays for average individuals.
Note: The UV index of 6 during September translates into the following guidance:
Skirt overexposure. People with light complexions might get scorched in under 20 minutes. Avoid direct exposure to the Sun between 10 a.m. and 4 p.m., the peak period for UV radiation, noting that objects like parasols or canopies might not offer complete sun protection. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage.