September weather forecast
Winter Haven, FL

The first month of the autumn, September, is still a hot month in Winter Haven, Florida, with an average temperature varying between 73.6°F (23.1°C) and 88°F (31.1°C).

Temperature

Winter Haven's average high-temperature in September is a still hot 88°F (31.1°C), marking an insignificant difference from the 90°F (32.2°C) of August. Winter Haven records an average low of 73.6°F (23.1°C) throughout the nights in September.

Heat index

The heat index value during September is evaluated at a scorching 105.8°F (41°C). More preventive actions are needed, risk of heat exhaustion and heat cramps is significant. Prolonged activity may trigger heatstroke.
Records show heat index calculations are tailored for shaded regions and mild winds. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'real feel', is a composite of temperature and humidity figures to convey how warm it feels. The influence of weather is personal, differing among individuals based on variations in body mass, stature, and the degree of physical exertion. Direct sunlight can potentially raise the heat index by 15 Fahrenheit (8 Celsius) degrees, so it's crucial to consider. Heat index values are highly important for children. Children often miss understanding the importance of rest and rehydration. Thirst usually appears late during dehydration - therefore, maintaining hydration, particularly during long physical activities, is essential.
The body's inherent cooling system operates through perspiration, wherein evaporating sweat offsets excessive heat. When the relative humidity is high, the evaporation rate is reduced. The warmth is removed from the body at a lower rate, causing the body to retain more heat than it would in dry air. Overheating dangers loom when the body's heat release mechanisms are overshadowed by excessive gain.

Humidity

August and September, with an average relative humidity of 79%, are the most humid months in Winter Haven.

Rainfall

In Winter Haven, in September, during 21.5 rainfall days, 3.15" (80mm) of precipitation is typically accumulated. In Winter Haven, during the entire year, the rain falls for 179.3 days and collects up to 28.66" (728mm) of precipitation.

Daylight

The average length of the day in September in Winter Haven is 12h and 19min.
On the first day of September in Winter Haven, sunrise is at 7:05 am and sunset at 7:47 pm. On the last day of the month, sunrise is at 7:19 am and sunset at 7:13 pm EDT.

Sunshine

The average sunshine in September is 8.7h.

UV index

The months with the highest UV index in Winter Haven are May through September, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high health hazard from exposure to the Sun's UV radiation for ordinary individuals.
Note: The UV index of 7 during September translates into the following guidance:
Adopt measures and apply sun safety strategies. Shielding from skin and eye damage is necessary. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation.