September weather forecast
Dérac, Haiti

The first month of the autumn, September, is also a moderately hot month in Dérac, Haiti, with an average temperature fluctuating between 24.3°C (75.7°F) and 29.5°C (85.1°F).

Temperature

September ushers in an average high-temperature of a still moderately hot 29.5°C (85.1°F), aligning closely with the preceding month. Throughout the month of September, Dérac reports a steady low-temperature average of 24.3°C (75.7°F).

Heat index

The heat index in September is computed to be a sweltering 36°C (96.8°F). Greater preventive actions are needed, heat exhaustion and heat cramps are likely. Persistent activity could provoke heatstroke.
Note that heat index values are valued for light wind and location in the shade. Direct sunlight has the potential to heighten heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', is a composite of temperature and humidity figures to convey how warm it feels. Metabolic differences, pregnancy status, and the level of physical activity are additional factors influencing an individual's weather perception. When you're directly under the sun's rays, remember that the heat index may surge by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Youngsters often neglect the necessity for rest and hydration. Thirst is a sign of advancing dehydration - thus the importance of maintaining hydration, specifically during long-lasting physical activities.
The body's inherent cooling system operates through perspiration, wherein evaporating sweat offsets excessive heat. When there is an excess of moisture in the atmosphere, the efficiency of the evaporation process is lessened, leading to less efficient body cooling and a sensation of overheating. Accumulating more heat than the body can dissipate leads to an uptick in body temperature, with potential heat stress consequences.

Humidity

In September, the average relative humidity is 78%.

Rainfall

In Dérac, during September, the rain falls for 22.4 days and regularly aggregates up to 77mm (3.03") of precipitation. In Dérac, during the entire year, the rain falls for 229.5 days and collects up to 678mm (26.69") of precipitation.

Sea temperature

September is the month with the warmest seawater, with an average sea temperature of 29.4°C (84.9°F).
Note: Swimming, diving, and other water activities in the temperature range of 25°C (77°F) to 29°C (84.2°F) are perceived as very enjoyable and comfortable for prolonged durations.

Daylight

In Dérac, the average length of the day in September is 12h and 15min.
On the first day of the month, sunrise is at 06:32 and sunset at 19:02. On the last day of September, sunrise is at 06:37 and sunset at 18:36 EDT.

Sunshine

The average sunshine in September is 10h.

UV index

April through October, with an average maximum UV index of 7, are months with the highest UV index. A UV Index value of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV radiation for average individuals.
Note: An average maximum UV index of 7 in September leads to these recommendations:
Beware of overexposure. Fair-skinned individuals risk burning in less than 20 minutes. The Sun's UV radiation is at its strongest between the hours of 10 a.m. and 4 p.m. Minimize direct exposure to the sun during this period. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Be careful! The Sun's UV radiation is accentuated by reflecting off sand and water.