September weather forecast
Hattiesburg, MS

The hot summer starts to wind down as September makes its entrance in Hattiesburg. With a significant dip in the hottest temperature, which falls to 87.8°F (31°C), it marks the onset of the fall. The city begins to wear a different look, with summer greens swapping places with fall hues. People welcome the cool breezes, a pleasant change after enduring the harsh summer. The environment buzzes with a renewed energy as the city starts its transition into the cooler months.

Temperature

Hattiesburg commences September with an average high-temperature of a still hot 87.8°F (31°C), maintaining a close resemblance to the previous month. During September, the temperature in Hattiesburg, Mississippi, tends to dip to an average of 68°F (20°C) at night.

Heat index

For September, the heat index is calculated to be a blisteringly hot 104°F (40°C). Implement additional preventive actions, heat cramps and heat exhaustion are potential hazards. Heatstroke could follow prolonged activity.
Take note of the fact that heat index values are based on shaded circumstances with light airflows. Direct sunlight might cause an increase of up to 15 Fahrenheit (8 Celsius) degrees in the heat index.
Note: The heat index, also known as 'feels like' or 'real feel', gauges the sensation of temperature factoring in the air's moisture content. The impact of weather on an individual can be subjective, affected by the person's activity and heat perception, which can vary due to elements including wind, clothing, and metabolic differences. With the sun shining directly, it's crucial to understand that it can increase the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Young children typically face greater hazards than adults because they do not sweat as much. Their larger skin surface in comparison to their little bodies and the high heat production from their active nature compounds their vulnerability.
To achieve cooling, the human body employs perspiration, relying on the subsequent evaporation of sweat. Excessive relative humidity disturbs the body's typical cooling process by reducing evaporation, leading to a decrease in body cooling rate and an increase in the sensation of warmth. When the body's heat gain surpasses its removal capacity, body temperature starts to climb, leading to potential heat-related ailments.

Humidity

In Hattiesburg, the average relative humidity in September is 76%.

Rainfall

In Hattiesburg, in September, it is raining for 17.5 days, with typically 2.91" (74mm) of accumulated precipitation. In Hattiesburg, during the entire year, the rain falls for 177.1 days and collects up to 36.42" (925mm) of precipitation.

Snowfall

In Hattiesburg, snow does not fall in April through November.

Daylight

In September, the average length of the day in Hattiesburg is 12h and 21min.
On the first day of the month, sunrise is at 6:33 am and sunset at 7:20 pm. On the last day of September, in Hattiesburg, sunrise is at 6:50 am and sunset at 6:43 pm CDT.

Sunshine

The average sunshine in September is 9.1h.

UV index

In Hattiesburg, the average daily maximum UV index in September is 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV rays for ordinary individuals.
Note: A maximum high UV index of 6 in September translates into the following recommendations:
Apply measures and align with sun safety principles. Safeguarding against skin and eye injury is pivotal. During the period from 10 a.m. to 4 p.m., UV radiation is highest. Try to avoid direct sunlight during these hours. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure.