September weather forecast
Norwalk, FL

September, the first month of the autumn in Norwalk, is still a hot month, with an average temperature fluctuating between 88.7°F (31.5°C) and 73.4°F (23°C).

Temperature

September's onset records an average high-temperature of a still hot 88.7°F (31.5°C), a near match to August's 91.8°F (33.2°C). Norwalk experiences a consistent average temperature of 73.4°F (23°C) throughout the nights in September.

Heat index

In September, the heat index is calculated to be a blisteringly hot 107.6°F (42°C). Adopt enhanced safety measures, heat exhaustion and heat cramps could occur. Continuous activity may induce heatstroke.
Bear in mind that the heat index values are determined for shaded areas and light breezes. Uninterrupted exposure to the sun may boost the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'feels like', integrates the air's temperature and its humidity to showcase the felt temperature by people. An individual's temperature experience can be influenced by extra factors, including metabolic differences, activity levels, and clothing. Direct exposure to the sun's rays can enhance the felt temperature, increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular significance for children. 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 self-cooling mechanism is rooted in perspiration, where evaporating sweat cools down excessive warmth. When relative humidity is heightened, it slows the rate of evaporation, thereby decreasing the body's ability to shed heat and creating a sensation of overheating. When heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.

Humidity

August and September, with an average relative humidity of 78%, are the most humid months in Norwalk.

Rainfall

In Norwalk, in September, during 17.2 rainfall days, 2.01" (51mm) of precipitation is typically accumulated. In Norwalk, during the entire year, the rain falls for 159.8 days and collects up to 21.93" (557mm) of precipitation.

Daylight

In September, the average length of the day in Norwalk is 12h and 20min.
On the first day of September in Norwalk, sunrise is at 7:04 am and sunset at 7:48 pm. On the last day of the month, sunrise is at 7:19 am and sunset at 7:13 pm EDT.

Sunshine

In Norwalk, the average sunshine in September is 8.5h.

UV index

The average daily maximum UV index in September in Norwalk is 6. A UV Index reading of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV radiation for ordinary individuals.
Note: The daily high UV index of 6 in September translates into this advice:
Guard against overexposure. Protection from sun-induced harm is essential. The time between 10 a.m. and 4 p.m. is when UV radiation is at its peak. Limit exposure to direct sunlight during these hours. Stay sun-safe with clothing that is both closely woven and worn loosely.