August weather forecast
South Beach, FL

The last month of the summer, August, is also a hot month in South Beach, Florida, with temperature in the range of an average high of 87.4°F (30.8°C) and an average low of 78.6°F (25.9°C).

Temperature

In South Beach, temperatures reach their average annual highs in August, measuring 87.4°F (30.8°C) and a minimum average of 78.6°F (25.9°C).

Heat index

Throughout August, the heat index is estimated at an extremely hot 104°F (40°C). Greater safety measures are needed, risk of heat exhaustion and heat cramps is high. Continuous activity might trigger heatstroke.
It is important to note that the heat index values are for shaded areas and light wind scenarios. The direct sun can potentially cause the heat index to increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'real feel', integrates the air's temperature and its humidity to showcase the felt temperature by people. Factors encompassing physical activity, clothing, and metabolic differences have a role in shaping the individual's impression of temperature. When directly under the sun, the weather's impact can intensify, possibly boosting the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for children. Young ones often ignore the need to take a break and drink fluids. Thirst is a late-stage symptom of dehydration - hence, maintaining hydration, particularly during extended physical activities, is crucial.
The process of perspiration is vital for the human body to get rid of excess warmth by allowing sweat to evaporate. A surge in relative humidity can disrupt the body's normal cooling function by slowing evaporation, hence reducing the rate at which the body cools and intensifying the perception of heat. Should the body fail to balance its heat gain, the escalating temperature poses health challenges.

Humidity

June through August, with an average relative humidity of 79%, are the most humid months.

Rainfall

The month with the most rainfall is August, when the rain falls for 20.2 days and typically aggregates up to 2.48" (63mm) of precipitation.

Ocean temperature

With an average ocean temperature of 84.9°F (29.4°C), August is the month with the warmest seawater in South Beach, Florida.
Note: In water temperatures ranging between 77°F (25°C) and 84.2°F (29°C), activities such as swimming and diving become highly pleasurable for long durations.

Daylight

In South Beach, Florida, the average length of the day in August is 13h and 5min.
On the first day of the month, sunrise is at 6:45 am and sunset at 8:10 pm. On the last day of August, in South Beach, Florida, sunrise is at 7:00 am and sunset at 7:42 pm EDT.

Sunshine

In August, the average sunshine in South Beach is 10.8h.

UV index

The months with the highest UV index in South Beach 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 unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The UV index of 7 in August translates into these instructions:
Beware of overexposure. Fair-skinned individuals risk burning in less than 20 minutes. Avoid direct sunlight between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. Keep in mind that shade structures may not provide complete protection. Opt for tightly woven and loose clothing to enhance protection from the Sun. Heads up! The reflection of sand and water notably intensifies UV rays from the Sun.