September weather forecast
Irvine, FL

The first month of the autumn, September, is still a tropical month in Irvine, Florida, with an average temperature ranging between min 72.3°F (22.4°C) and max 88°F (31.1°C).

Temperature

As August transitions into September, Irvine records an average high-temperature of a still hot 88°F (31.1°C), showing a gentle shift from the preceding month. An average nighttime temperature of 72.3°F (22.4°C) is witnessed in Irvine throughout September.

Heat index

The average heat index in September is appraised at a blistering 105.8°F (41°C). Extra safeguards are necessary to prevent heat exhaustion and heat cramps. Prolonged activity might cause heatstroke.
Bear in mind that the heat index values are determined for shaded areas and light breezes. Exposure to the direct sun might augment heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. This effect tends to be personal, with the weather perception differing among individuals due to variations in body mass, height, and exertion. Given direct exposure to sunlight, one might experience a rise in the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for babies and toddlers. Children often overlook the necessity for resting and fluid replenishment. Thirst is a late sign of dehydration - thus, it is critical to stay hydrated, especially during extended periods of physical activities.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. Under conditions of high temperature and humidity (enhanced heat index), sweat production is compromised, exacerbating the sensation of warmth. Temperature imbalances caused by excessive heat retention can trigger heat-related maladies.

Humidity

The months with the highest humidity are July through September, with an average relative humidity of 78%.

Rainfall

In Irvine, in September, during 16.8 rainfall days, 1.61" (41mm) of precipitation is typically accumulated. Throughout the year, there are 162.6 rainfall days, and 24.09" (612mm) of precipitation is accumulated.

Daylight

In September, the average length of the day in Irvine is 12h and 20min.
On the first day of the month, sunrise is at 7:06 am and sunset at 7:50 pm. On the last day of September, in Irvine, sunrise is at 7:22 am and sunset at 7:15 pm EDT.

Sunshine

The average sunshine in September is 8.6h.

UV index

In Irvine, Florida, the average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high health hazard from exposure to the Sun's UV radiation for ordinary individuals.
Note: The average daily UV index of 6 in September transforms into the following instructions:
Take precautions against overexposure. Protection against sun damage is needed. Limit your direct sun exposure, especially between 10 a.m. and 4 p.m., when UV radiation is strongest. Shade structures might not provide complete sun protection. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes.