September weather forecast
Deerfield Beach, FL

As Deerfield Beach, Florida's summer draws to a close in September, there is a slight decrease in average maximum and sea temperatures, making the weather pleasantly mild. Undulated by a prolonged summer, September witnesses a decrease in humidity levels and a fall in the UV index from the high of the summer months. This respite from intense sun is replaced with an average cloud cover of 31%, offering shadowed relief for beach-goers and residents. The shoulder season begins to usher in cooler winds from the ocean, setting the stage for the imminent fall season.

Temperature

Deerfield Beach experiences a minor change to a warm 85.3°F (29.6°C) in average high-temperature during September, closely reflecting August. Throughout September, a modest shift from daytime highs is anticipated in Deerfield Beach, with an average low-temperature of 80.2°F (26.8°C).

Heat index

The heat index value during September is estimated at a very hot 95°F (35°C). Implement heightened safety measures - risk of heat exhaustion and heat cramps is increased. Prolonged activity may result in heatstroke.
It is essential to grasp that the heat index's numbers are for shade and light wind settings. Direct sunlight might lead to a heat index increase by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'real feel', gives an indication of how one might feel in terms of heat after considering humidity. A person's impression of weather can be swayed by numerous aspects, among them metabolic variations, pregnancy, and activity levels. Consider the sun's direct rays and their impact; they can potentially increase the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular significance for children. Children regularly disregard the necessity to rest and replenish fluids. Thirst is a late symptom of dehydration - thus, maintaining hydration, particularly during long-lasting physical activities, is essential.
The human body cools itself through perspiration, as excessive warmth is removed from the body through sweat evaporation. In conditions of both high temperature and humidity (a high heat index), sweating is limited and the perception of heat is enhanced. Increasing body temperatures can be a precursor to dehydration if the body can't shed the extra heat.

Humidity

In September, the average relative humidity in Deerfield Beach is 74%.

Rainfall

In September, in Deerfield Beach, the rain falls for 26.9 days. Throughout September, 7.28" (185mm) of precipitation is accumulated. In Deerfield Beach, during the entire year, the rain falls for 243.5 days and collects up to 53.31" (1354mm) of precipitation.

Ocean temperature

In Deerfield Beach, in September, the average water temperature is 85.1°F (29.5°C).
Note: Water temperature ranging from 77°F (25°C) to 84.2°F (29°C) is recognized as warm and pleasant by all, making water activities comfortable and delightful for long durations.

Daylight

In Deerfield Beach, the average length of the day in September is 12h and 18min.
On the first day of September, sunrise is at 7:00 am and sunset at 7:39 pm. On the last day of the month, sunrise is at 7:12 am and sunset at 7:07 pm EDT.

Sunshine

The average sunshine in September in Deerfield Beach is 8.9h.

UV index

May through September, with an average maximum UV index of 7, are months with the highest UV index in Deerfield Beach. A UV Index value of 6 to 7 symbolizes a high health hazard from exposure to the Sun's UV rays for the average person.
Note: A typical high UV index of 7 in September suggests the following recommendations:
Eschew overexposure. Those with light skin may suffer burns in fewer than 20 minutes. Remember that UV radiation from the Sun is strongest between 10 a.m. and 4 p.m. Make an effort to limit direct sun exposure during this time. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses. Be cautious! Sand and water surfaces make the Sun's UV rays more potent.