August weather forecast
Key West, FL

August can be deemed as the most active month in terms of weather events in Key West. The intensity of sunlight during day time is counteracted by the occasional thunderstorms which bring respite from the heat. The constant weather changes can sometimes result in unfavorable conditions, but the tropical charm of the city remains intact. Along with the peak of hurricane season, the month offers the highest sea temperatures, peaking at 86.9°F (30.5°C), defining August's marine appeal.

Temperature

With average high and low temperatures of 85.3°F (29.6°C) and 82.9°F (28.3°C) respectively, August is Key West's warmest month.

Heat index

The heat index value for August is computed to be a fiery hot 95°F (35°C). Emphasize additional safety, risk of heat cramps and heat exhaustion is high. Continuous activity might result in heatstroke.
In terms of the heat index, values are set with light wind and shade conditions in mind. Direct exposure to sunlight could raise the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'real feel', joins air temperature with relative humidity to produce a temperature perception for humans. Elements such as metabolic variations, pregnancy, and physical exertion can shape one's weather perception. Exposure to direct sun rays can influence the heat you feel, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical to babies and toddlers. Children usually face more risks than adults as their ability to sweat is less. Additionally, their larger skin surface in relation to their petite bodies and higher heat output due to their activities increases their vulnerability.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. In the presence of elevated relative humidity, the evaporation rate decreases. This reduction leads to increased body heat retention compared to conditions of dry air. Should the body fail to balance its heat gain, the escalating temperature poses health challenges.

Humidity

The months with the lowest humidity are July through September, with an average relative humidity of 74%.

Rainfall

In Key West, during August, the rain falls for 23.1 days and regularly aggregates up to 4.33" (110mm) of precipitation. Throughout the year, there are 199.2 rainfall days, and 31.61" (803mm) of precipitation is accumulated.

Ocean temperature

With an average ocean temperature of 86.9°F (30.5°C), August is the month with the warmest seawater in Key West.
Note: One could argue that swimming in waters above 86°F (30°C) lacks the desired refreshing touch.

Daylight

The average length of the day in August in Key West is 12h and 58min.
On the first day of the month, sunrise is at 6:55 am and sunset at 8:11 pm. On the last day of August, sunrise is at 7:08 am and sunset at 7:46 pm EDT.

Sunshine

In August, the average sunshine is 9.7h.

UV index

April through October, 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: In August, a daily UV index of 7 turns into the following recommendations:
Avoid overexposure. Fair-skinned individuals can burn in under 20 minutes. It's important to stay in the shade and limit exposure to the sun from 10 a.m. to 4 p.m., when UV radiation is most intense, although remember that shade structures may not provide full sun protection. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades. Stay aware! UV radiation is magnified when reflecting off sand and water.