September weather forecast
Guanabana, Cuba

The first month of the autumn, September, is still a tropical month in Guanabana, Cuba, with an average temperature fluctuating between 24.1°C (75.4°F) and 31.2°C (88.2°F).

Temperature

With September's arrival, Guanabana's weather records an average high-temperature of a still tropical 31.2°C (88.2°F), marking little difference from August's 32.1°C (89.8°F). In Guanabana, the average temperature during the nights of September drops to a warm 24.1°C (75.4°F).

Heat index

For September, the heat index is evaluated at a blistering 42°C (107.6°F). Exercise special caution, heat exhaustion and heat cramps are probable. Prolonged activity may induce heatstroke.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to the sun directly might heighten the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', is an aggregate value of air's warmth and moisture to show the human-felt temperature. The effect is personal, with varied weather perceptions among individuals due to differences in body mass, stature, and physical activity. Direct exposure to the sun's rays can enhance the felt temperature, increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for children. 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 physiological response of the human body to excess warmth is to perspire, thereby cooling itself through sweat evaporation. An upsurge in relative humidity affects normal body cooling mechanisms by slowing evaporation, hence reducing the rate at which the body cools and intensifying the perception of heat. When body heat isn't effectively managed, risks of dehydration and overheating amplify.

Humidity

The most humid month is September, with an average relative humidity of 82%.

Rainfall

In September, the rain falls for 23 days. Throughout September, 95mm (3.74") of precipitation is accumulated. Throughout the year, there are 204.4 rainfall days, and 774mm (30.47") of precipitation is accumulated.

Daylight

In September, the average length of the day is 12h and 16min.
On the first day of the month, sunrise is at 07:08 and sunset at 19:43. On the last day of September, sunrise is at 07:17 and sunset at 19:14 CDT.

Sunshine

In September, the average sunshine in Guanabana is 8.8h.

UV index

April through September, with an average maximum UV index of 7, are months with the highest UV index in Guanabana. A UV Index estimate of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV rays for the ordinary person.
Note: The UV index of 7 during September leads to these advisories:
Stand by precautions and apply sun safety measures. Evading sunburn is of great importance. Avoid direct Sun exposure and stay in the shade between 10 a.m. and 4 p.m., a time when UV radiation is most intense, noting that not all shade structures offer full protection. Enhance your sun protection with tightly woven, yet airy clothing.