September weather forecast
Cornillon, Haiti

Temperatures in September relent slightly, with the maximum dropping to 29.8°C (85.6°F), marking a change from the scorching summer days of Cornillon. However, September brings the second highest rainfall of the year, up to 135mm (5.31"), signaling the onset of a wet season. A decrease in daylight hours and a rise in cloud percentage hint at the gradual transition into the cooler part of the year. Despite the heavier rains, there are still ample opportunities to enjoy the city's warm climate. October promises a significant decrease in rainfall back to moderate levels and slight cooling.

Temperature

September brings an average high-temperature of a moderately hot 29.8°C (85.6°F), showing a slight difference from August's 30.9°C (87.6°F). In September, the recorded average low-temperature is a pleasant 21.3°C (70.3°F).

Heat index

The heat index value for September is calculated to be a torrid 36°C (96.8°F). Implement additional safety measures to avoid heat cramps and heat exhaustion. Persistent activity might trigger heatstroke.
Heat index determinations are made taking into account the shade and light air movements. The heat index has the possibility to be enhanced by 15 Fahrenheit (8 Celsius) degrees when there is direct sun exposure.
Note: The heat index, also known as 'apparent temperature' or 'real feel', gives an indication of how one might feel in terms of heat after considering humidity. The influence of weather is personal, differing among a variety of individuals based on differences in body mass, stature, and the level of physical activity. Keep in mind that direct sunshine exposure can amplify the weather's effects, possibly increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical for babies and toddlers. Children commonly overlook the importance of rest and fluid replenishment. Thirst, being a delayed sign of dehydration, emphasizes the need to keep hydration up, especially during lengthy physical activities.
To cool down, the human body relies on perspiration, a process where excessive heat is eliminated as sweat evaporates. With excessive moisture in the atmosphere, the effectiveness of the evaporation process is decreased, causing the body to cool down less efficiently, leading to a sensation of overheating. Accumulating heat beyond the body's cooling measures leads to rising temperatures and potential ailments.

Humidity

In Cornillon, the average relative humidity in September is 77%.

Rainfall

In Cornillon, during September, the rain falls for 22.4 days and regularly aggregates up to 135mm (5.31") of precipitation. In Cornillon, during the entire year, the rain falls for 227.4 days and collects up to 904mm (35.59") of precipitation.

Daylight

The average length of the day in September in Cornillon, Haiti, is 12h and 14min.
On the first day of the month, sunrise is at 06:33 and sunset at 19:01. On the last day of September, in Cornillon, sunrise is at 06:38 and sunset at 18:36 EDT.

Sunshine

In Cornillon, the average sunshine in September is 9.6h.

UV index

The months with the lowest UV index in Cornillon are January through May, July through December, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high health risk from unprotected exposure to Sun's UV rays for the ordinary person.
Note: An average UV index of 6 in September transforms into this advice:
Use protective steps and abide by sun safety guidelines. Safeguarding against skin and eye harm is necessary. Remember that UV radiation from the Sun is strongest between 10 a.m. and 4 p.m. Make an effort to limit direct sun exposure during this time. To cut down UV radiation exposure by about half, sport a wide-brim hat.