September weather forecast
Altamonte Springs, FL

September, the first month of the autumn in Altamonte Springs, is still a tropical month, with temperature in the range of an average high of 88.5°F (31.4°C) and an average low of 74.3°F (23.5°C).

Temperature

Altamonte Springs's average high-temperature in September sits at a still hot 88.5°F (31.4°C), showing little difference from the previous month. Altamonte Springs's nighttime temperature in September drops to an average of 74.3°F (23.5°C).

Heat index

Throughout September, the heat index is calculated to be a blisteringly hot 105.8°F (41°C). Exercise increased caution, heat cramps and heat exhaustion are potential hazards. Continuous activity could lead to heatstroke.
Heat index specifics point out values are for conditions of shade and a slight breeze. Uninterrupted exposure to the sun may boost the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. One's perception of temperature is subjective, varying based on their activity and individual heat perception, influenced by factors like wind, clothing, and metabolic variations. One must note that being under the direct sun can escalate the heat's effects, with the heat index possibly rising by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Youngsters often neglect the necessity for rest and hydration. Thirst is a sign of advancing dehydration - thus the importance of maintaining hydration, specifically during long-lasting physical activities.
As a reaction to high temperatures, the human body begins to perspire, using the evaporation of sweat to lower its temperature. When relative humidity is at high levels, the evaporation rate lessens, causing the body to keep more heat than it would in less humid conditions. Increasing body temperatures can be a precursor to dehydration if the body can't shed the extra heat.

Humidity

The most humid month in Altamonte Springs, Florida, is September, with an average relative humidity of 77%.

Rainfall

In Altamonte Springs, in September, it is raining for 19.7 days, with typically 2.48" (63mm) of accumulated precipitation. In Altamonte Springs, during the entire year, the rain falls for 172.9 days and collects up to 22.76" (578mm) of precipitation.

Daylight

The average length of the day in September in Altamonte Springs is 12h and 19min.
On the first day of the month, sunrise is at 7:03 am and sunset at 7:46 pm. On the last day of September, sunrise is at 7:18 am and sunset at 7:12 pm EDT.

Sunshine

The average sunshine in September is 8.8h.

UV index

May through September, with an average maximum UV index of 7, are months with the highest UV index. A UV Index of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV rays for the average person.
Note: A daily high UV index of 7 in September leads to these guidelines:
Stay clear of intense sun exposure. Solar protection is of utmost significance. Between 10 a.m. and 4 p.m., the Sun emits the most powerful UV radiation. Limit direct exposure to the Sun during these hours. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear.