September weather forecast
Rock River, Jamaica

September, the first month of the autumn in Rock River, is still a tropical month, with temperature in the range of an average high of 30.4°C (86.7°F) and an average low of 22.9°C (73.2°F).

Temperature

The average high-temperature during September registers at a still hot 30.4°C (86.7°F), closely corresponding to the preceding month. Rock River's nighttime temperature during September is consistently averaged at an agreeable 22.9°C (73.2°F).

Heat index

Throughout September, the heat index is calculated to be a fiery hot 39°C (102.2°F). Incorporate extra safety measures to avoid heat exhaustion and heat cramps. Continuous activity could provoke heatstroke.
Bear in mind that the heat index values are determined for shaded areas and light breezes. Direct sunlight might lead to a heat index increase by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', is the result of factoring in humidity to the air temperature, indicating perceived warmth. Additional elements including metabolic differences, the level of physical activity, and attire have a role in shaping the individual's temperature perception. Awareness is key; direct sunlight can enhance the weather's impact, possibly boosting the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical for babies and toddlers. Young ones often do not realize the necessity to rest and replenish their fluids. Thirst is a delayed indication of dehydration - keeping hydrated, particularly in prolonged physical activity, is crucial.
To cool down, the human body relies on perspiration, a process where excessive heat is eliminated as sweat evaporates. Under conditions of high relative humidity, the rate of evaporation decreases. This results in the body retaining more heat than under conditions of dry air. When heat surpasses the body's release mechanisms, dehydration and overheating risks become pronounced.

Humidity

The average relative humidity in September is 81%.

Rainfall

In Rock River, Jamaica, during September, the rain falls for 25.9 days and regularly aggregates up to 132mm (5.2") of precipitation. In Rock River, during the entire year, the rain falls for 279.6 days and collects up to 947mm (37.28") of precipitation.

Daylight

In Rock River, the average length of the day in September is 12h and 14min.
On the first day of September, sunrise is at 05:54 and sunset at 18:22. On the last day of the month, sunrise is at 05:59 and sunset at 17:57 EST.

Sunshine

In Rock River, the average sunshine in September is 11.1h.

UV index

The months with the lowest UV index in Rock River are January through April, September through December, with an average maximum UV index of 6. A UV Index of 6 to 7 symbolizes a high health hazard from unsafe exposure to UV radiation for the average person.
Note: A maximum high daily UV index of 6 during September translates into the following directions:
Undertake precautions and comply with sun safety standards. Protection from skin and eye injury is vital. Seek shade and limit direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation. Keep in mind that shade structures like parasols or canopies do not offer complete sun protection. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized.