September weather forecast
McComb, MS

September witnesses the gradual transition of McComb's weather from the peak summer conditions to the cooler autumn season. The temperatures start to decline, giving a noticeable relief from the scorching summer heat. Rainfall continues to be significant, although not quite as high as August's peak. The maximum temperatures begin to abate, averaging around 86.7°F (30.4°C). Though a decrease, it continues to foster the feel of late-summer, and the weather begins to take on a distinctly mellow character.

Temperature

With the onset of September in McComb, a modest change to a still tropical 86.7°F (30.4°C) from August's 90.3°F (32.4°C) is noted in high-temperature. In the month of September, the average low-temperature in McComb usually rests at an agreeable 68°F (20°C).

Heat index

In September, the heat index is evaluated at a sweltering 100.4°F (38°C). Implement more safety precautions, heat cramps and heat exhaustion may happen. Persistent activity could induce heatstroke.
Note that heat index values are valued for light wind and location in the shade. The heat index might be elevated by 15 Fahrenheit (8 Celsius) degrees due to direct sun exposure.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', is a numerical representation of warmth when taking temperature and moisture levels into account. A person's impression of weather can be affected by numerous aspects, among them metabolic variations, pregnancy, and activity levels. In direct sunlight, the heat's impact can be heightened, potentially leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for babies and toddlers. Youths are typically more endangered than adults since they usually sweat less. Their larger skin surface concerning their smaller bodies and higher heat production due to activity further adds to their vulnerability.
The body's innate mechanism to counteract overheating is through perspiration, as it leverages the cooling effects of sweat evaporation. 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. Increasing body temperatures can be a precursor to dehydration if the body can't shed the extra heat.

Humidity

In McComb, the average relative humidity in September is 78%.

Rainfall

In McComb, Mississippi, in September, during 16 rainfall days, 1.42" (36mm) of precipitation is typically accumulated. In McComb, during the entire year, the rain falls for 151.2 days and collects up to 17.8" (452mm) of precipitation.

Snowfall

February, April through November are months without snowfall.

Daylight

In September, the average length of the day is 12h and 20min.
On the first day of September, sunrise is at 6:38 am and sunset at 7:24 pm. On the last day of the month, sunrise is at 6:55 am and sunset at 6:47 pm CDT.

Sunshine

In McComb, the average sunshine in September is 9.2h.

UV index

In McComb, Mississippi, the average daily maximum UV index in September is 6. 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, 6 in September, converts into the following recommendations:
Exercise precautions and adapt sun safety practices. Defence against skin and eye affliction is paramount. Limit direct sun exposure and seek shade between 10 a.m. and 4 p.m., the time of the most intense UV radiation, noting that shade structures may not provide total sun protection. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat.