September weather forecast
Stuart, FL

September, the first month of the autumn in Stuart, is also a moderately hot month, with an average temperature fluctuating between 78.3°F (25.7°C) and 85.3°F (29.6°C).

Temperature

Stuart's transition from August to September introduces an average high-temperature of a warm 85.3°F (29.6°C), marking an insignificant variation from the 87.1°F (30.6°C). In Stuart, the nighttime temperature in September descends gently to an average of 78.3°F (25.7°C).

Heat index

In September, the heat index is estimated at a fiery hot 96.8°F (36°C). Exercise more precautions, heat cramps and heat exhaustion are potential risks. Continuous activity could precipitate heatstroke.
Bear in mind that the heat index values are determined for shaded areas and light breezes. The heat index can potentially augment by 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', arises from combining readings of air temperature and relative moisture content. This effect is subjective, differing among individuals based on their physical activity and perception of heat, which can be influenced by factors like wind, clothing, and metabolic variances. Remember, direct sunlight exposure can heighten the heat impact and might increase the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular significance for children. Kids often lack the knowledge about the necessity to take breaks and consume liquids. Thirst, as a late symptom of dehydration, necessitates the maintenance of hydration, particularly during enduring physical activities.
The human body cools itself through perspiration, as excessive warmth is removed from the body through sweat evaporation. In circumstances of high air temperature and humidity (high heat index), the body's perspiration is restricted, heightening the feeling of warmth. Overheating and potential dehydration arise when body heat gain eclipses its release capability.

Humidity

The average relative humidity in September is 77%.

Rainfall

In Stuart, in September, during 22.6 rainfall days, 1.5" (38mm) of precipitation is typically accumulated. Throughout the year, there are 168.1 rainfall days, and 14.09" (358mm) of precipitation is accumulated.

Ocean temperature

In Stuart, in September, the average water temperature is 84.4°F (29.1°C).
Note: In any water activity, temperatures between 77°F (25°C) and 84.2°F (29°C) are viewed as magnificent and exceptionally pleasant for prolonged enjoyment.

Daylight

In September, the average length of the day is 12h and 19min.
On the first day of the month, sunrise is at 7:00 am and sunset at 7:41 pm. On the last day of September, sunrise is at 7:13 am and sunset at 7:08 pm EDT.

Sunshine

In Stuart, the average sunshine in September is 9h.

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 unprotected exposure to Sun's UV rays for ordinary individuals.
Note: An average UV index of 7 in September transforms into this advice:
Beware of overexposure. Fair-skinned individuals risk burning in less than 20 minutes. Try to minimize direct Sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation. Also note that objects like parasols or canopies might not provide complete sun protection. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Be attentive! The UV exposure is heightened with reflections from sand and water.