September weather forecast
Boca Raton, FL

In September, Boca Raton begins transitioning towards autumn, but the heat persists with reduced intensity. This transition month experiences a noticeable reduction in daily sunshine hours, indicating shortening days. Despite reduced heat, humidity levels remain on the higher side, while frequent showers contribute to the overall moist conditions. The wind speed observes a minor, yet noticeable, increase compared to August. The sea temperature in Boca Raton is high in September, averaging 85.1°F (29.5°C).

Temperature

Boca Raton experiences an average high-temperature of a warm 85.3°F (29.6°C) in September, marking an insignificant shift from 87.1°F (30.6°C) in August. Boca Raton, in September, registers a nighttime average temperature of 80.2°F (26.8°C).

Heat index

For most parts of September, the heat index is estimated at a torrid 95°F (35°C). Undertake additional precautions, heat cramps and heat exhaustion could happen. Heatstroke could occur from sustained activity.
Research indicates the heat index considers values in shaded locales and with light winds. Direct sunlight might cause an increase of up to 15 Fahrenheit (8 Celsius) degrees in the heat index.
Note: The heat index, also known as 'real feel' or 'feels like', takes into account both air temperature and humidity to illustrate what people actually feel. The individual's experience of temperature can be shaped by numerous aspects such as metabolic variations, physical exertion, and attire. With direct sunlight, be aware that it might enhance the heat sensation, raising the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values remain especially vital for babies and toddlers. Youngsters generally face more threats than adults given their lesser ability to sweat. Coupled with their larger skin surface relative to their small bodies and higher heat production due to their activities, they are more endangered.
The human body normally cools itself by perspiration. Excessive warmth is eliminated from the body by evaporation of sweat. When the air holds a significant amount of moisture, the efficiency of the evaporation process is decreased, preventing the body from cooling down efficiently, leading to the sensation of overheating. Exceeding the body's heat disposal threshold results in a rise in body temperature and potential thermal disorders.

Humidity

In September, the average relative humidity is 74%.

Rainfall

In September, the rain falls for 27.8 days. Throughout September, 10.59" (269mm) of precipitation is accumulated. Throughout the year, there are 244.6 rainfall days, and 68.54" (1741mm) of precipitation is accumulated.

Ocean temperature

In September, the average ocean temperature in Boca Raton is 85.1°F (29.5°C).
Note: With water temperature from 77°F (25°C) to 84.2°F (29°C), all water activities are comfortable and delightful, devoid of discomfort even for lengthened periods.

Daylight

In September, the average length of the day in Boca Raton is 12h and 18min.
On the first day of September in Boca Raton, 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

In Boca Raton, the average sunshine in September is 9h.

UV index

The months with the highest UV index in Boca Raton are May through September, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The maximum UV index of 7 during September leads to these instructions:
Refrain from overexposure. Fair-skinned individuals could burn in under 20 minutes. Avoid direct Sun exposure and seek shade from 10 a.m. to 4 p.m., the period of highest UV radiation. Remember, however, that not all shade structures offer full protection. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses. Note! Reflective surfaces like sand and water heighten the UV radiation levels.