September weather forecast
Melbourne, FL

September, the first month of the autumn in Melbourne, is still a warm month, with an average temperature fluctuating between 77.5°F (25.3°C) and 85.1°F (29.5°C).

Temperature

The advent of September denotes an average high-temperature of a warm 85.1°F (29.5°C), subtly different from August's 87.3°F (30.7°C). The temperature during September experiences a small drop from daytime peaks, recording an average of 77.5°F (25.3°C) at night.

Heat index

In September, the heat index is evaluated at a very hot 96.8°F (36°C). Greater safety measures are needed, risk of heat exhaustion and heat cramps is high. Continuous activity might trigger heatstroke.
Take into consideration that the heat index values are calculated for shade and light wind conditions. The direct sunshine could escalate the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', is a composite of temperature and humidity figures to convey how warm it feels. This effect is personal, shaped by the individual's physical activity and heat sensitivity, influenced by factors including wind, clothing, and metabolic variances. Sunshine, when direct, has the potential to intensify weather effects, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially vital to children. Children usually face more risks than adults as their ability to sweat is less. Additionally, their larger skin surface in relation to their petite bodies and higher heat output due to their activities increases their vulnerability.
Perspiration is the body's default response to elevated temperatures, as it promotes the evaporation of sweat to achieve cooling. 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. Rising body temperatures resulting from an imbalance in heat absorption can lead to potential thermal issues.

Humidity

In September, the average relative humidity is 78%.

Rainfall

In Melbourne, in September, during 21.2 rainfall days, 2.8" (71mm) of precipitation is typically accumulated. In Melbourne, during the entire year, the rain falls for 176.1 days and collects up to 22.28" (566mm) of precipitation.

Ocean temperature

In September, the average ocean temperature is 84°F (28.9°C).
Note: For swimming, diving, and other water activities, temperatures between 77°F (25°C) and 84.2°F (29°C) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

Daylight

The average length of the day in September is 12h and 19min.
On the first day of September, sunrise is at 7:01 am and sunset at 7:43 pm. On the last day of the month, sunrise is at 7:15 am and sunset at 7:09 pm EDT.

Sunshine

The average sunshine in September is 9.1h.

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 risk from exposure to the Sun's UV radiation for the ordinary person.
Note: The maximum daily UV index of 7 during September translates into the following directions:
Beware of overexposure. Fair-skinned individuals risk burning in less than 20 minutes. UV radiation from the sun is at its strongest between 10 a.m. and 4 p.m. Try to limit direct exposure during these hours. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days. Attention! UV radiation is markedly stronger with water and sand reflections.