September weather forecast
Fullerton, LA

The first month of the autumn, September, is still a hot month in Fullerton, Louisiana, with temperature in the range of an average high of 88.2°F (31.2°C) and an average low of 68.9°F (20.5°C).

Temperature

Fullerton measures an average high-temperature of a still tropical 88.2°F (31.2°C) in September, nearly consistent with the preceding month. In the month of September, the average low-temperature in Fullerton usually rests at an agreeable 68.9°F (20.5°C).

Heat index

The heat index for September is appraised at a blistering 104°F (40°C). Heightened precautions are necessary, heat cramps and heat exhaustion are potential risks. Continuous activity could lead to heatstroke.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Uninterrupted exposure to the sun may boost the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'real feel', joins air temperature with relative humidity to produce a temperature perception for humans. The effect is experienced differently by individuals, hinging on unique characteristics such as body mass, stature, and level of activity. One should be aware that direct sunshine can amplify the perceived temperature, raising the heat index by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children often do not understand the need to rest and hydrate. Thirst is a late manifestation of dehydration - therefore, it is essential to stay hydrated, particularly during prolonged physical activities.
Perspiration, followed by sweat evaporation, is the human body's chief method to maintain a balanced temperature. 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 the body gains more heat than it can dissipate, there's a risk of increasing temperatures and resultant overheating.

Humidity

The average relative humidity in September is 76%.

Rainfall

In Fullerton, in September, it is raining for 17.5 days, with typically 3.15" (80mm) of accumulated precipitation. In Fullerton, during the entire year, the rain falls for 181.2 days and collects up to 39.17" (995mm) of precipitation.

Snowfall

Months with snowfall are January through March, September and December. September is the first month it typically snows in Fullerton. Throughout September, in the average 0.1 snowfall days, it receives 0.04" (1mm) of snow. Throughout the year, in Fullerton, there are 1.8 snowfall days, and 0.94" (24mm) of snow is accumulated.

Daylight

In Fullerton, the average length of the day in September is 12h and 20min.
On the first day of September in Fullerton, sunrise is at 6:48 am and sunset at 7:34 pm. On the last day of the month, sunrise is at 7:05 am and sunset at 6:57 pm CDT.

Sunshine

The average sunshine in September in Fullerton is 9.2h.

UV index

The average daily maximum UV index in September is 6. A UV Index estimate of 6 to 7 represents a high health vulnerability from unsafe exposure to UV radiation for average individuals.
Note: The UV index of 6 during September leads to these advisories:
Take precautions against overexposure. Protection against sun damage is needed. The Sun's UV radiation is most intense from 10 a.m. to 4 p.m. Try to avoid direct sun exposure during these hours. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage. Stay alert! Snow's reflective properties can almost double the UV radiation from the Sun.