September weather forecastNorwalk, FL
September
Weather in September
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.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Norwalk, FL
- Average high temperature in September: 88.7°F
The warmest month (with the highest average high temperature) is August (91.8°F).
The month with the lowest average high temperature is January (66.7°F).
- Average low temperature in September: 73.4°F
The month with the highest average low temperature is August (75°F).
The coldest month (with the lowest average low temperature) is January (48.7°F).
Average pressure in September
Norwalk, FL
- Average pressure in September: 29.97"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is September (29.97"Hg).
Average wind speed in September
Norwalk, FL
- Average wind speed in September: 4.5mph
The windiest month (with the highest average wind speed) is April (5.7mph).
The calmest month (with the lowest average wind speed) is July (4.1mph).
Average humidity in September
Norwalk, FL
- Average humidity in September: 78%
The months with the highest relative humidity are August and September (78%).
The month with the lowest relative humidity is March (71%).
Average rainfall in September
Norwalk, FL
- Average rainfall in September: 2.01"
The wettest month (with the highest rainfall) is July (3.15").
The driest month (with the least rainfall) is March (0.94").
Average rainfall days in September
Norwalk, FL
- Average rainfall days in September: 17.2 days
The month with the highest number of rainy days is July (20.9 days).
The month with the least rainy days is November (8.4 days).
Average daylight in September /
Average sunshine in September
Norwalk, FL
- Average daylight in September: 12h and 18min
The month with the longest days is June (Average daylight: 14h and 0min).
The month with the shortest days is December (Average daylight: 10h and 18min).
- Average sunshine in September: 8h and 30min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is December (Average sunshine: 6h and 0min).
Average sunshine days in September
Norwalk, FL
- Average sunshine days in September: 10.9 days
The month with the most sunshine days is November (20.5 days).
The month with the least sunshine days is August (7.9 days).
Average UV index in September
Norwalk, FL
- Average UV index in September: 6
The months with the highest UV index are May, June, July and August (UV index 7).
The month with the lowest UV index is January (UV index 4).
Average cloud cover in September
Norwalk, FL
- Average cloud cover in September: 33
The month with the most cloud cover is February (Cloud cover 39).
The month with the least cloud cover is May (Cloud cover 30).
Average visibility in September
Norwalk, FL
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
