September weather forecast
West Palm Beach, FL

September in West Palm beach acts as a bridge connecting the hot summer with the milder seasons. The weather continues to be warm but begins to show signs of a shift in temperature trends. Notably, there is a drop in the amount of daylight hours which starts to impact outdoor activities. Expect the rainfall accumulation to begin normalizing, registering at 2.87" (73mm) throughout this month. The distinguishing feature of September remains the high temperature of 84.7°F (29.3°C), indicating a departure from the intense summer heat.

Temperature

September's advent denotes a minor fluctuation in the average high-temperature to a moderately hot 84.7°F (29.3°C) from August's 86.5°F (30.3°C). West Palm Beach encounters a small divergence from daytime high temperatures, averaging a low-temperature of 80.4°F (26.9°C) during September nights.

Heat index

September's mean heat index is estimated at a tropical 93.2°F (34°C). Incorporate additional preventive steps, heat exhaustion and heat cramps are possible. Long-lasting activity may cause heatstroke.
In terms of the heat index, values are set with light wind and shade conditions in mind. If directly exposed to the sun, the heat index could rise by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'real feel', blends air temperature and moisture content to represent the felt temperature to humans. The influence of weather is personal, with a diverse population experiencing it differently due to differences in body mass, stature, and degree of activity. When exposed to direct sunlight, it's possible for the heat index to increase by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are essentially critical 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.

Humidity

The average relative humidity in September in West Palm Beach is 75%.

Rainfall

In West Palm Beach, during September, the rain falls for 25 days and regularly aggregates up to 2.87" (73mm) of precipitation. In West Palm Beach, during the entire year, the rain falls for 193.9 days and collects up to 22.56" (573mm) of precipitation.

Ocean temperature

In West Palm Beach, in September, the average water temperature is 84.7°F (29.3°C).
Note: Temperatures between 77°F (25°C) and 84.2°F (29°C) are excellent for swimming, diving, and other water activities, providing comfort and enjoyment for extended periods without discomfort.

Daylight

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

Sunshine

In September, the average sunshine in West Palm Beach is 9h.

UV index

The months with the highest UV index 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 unsafe exposure to UV radiation for ordinary individuals.
Note: In September, a regular UV index of 7 translates into these guidelines:
Fend off overexposure. Sun protection is vital. Limit direct sun exposure especially between 10 a.m. and 4 p.m., when UV radiation is at its peak. However, keep in mind that shade structures may not provide full sun protection. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation. Take heed! Reflections of sand and water make the Sun's UV rays stronger.