October weather forecast
Port Royal, Jamaica

October, the same as September, is another warm autumn month in Port Royal, Jamaica, with an average temperature varying between 24°C (75.2°F) and 29.2°C (84.6°F).

Temperature

In October, the average high-temperature is practically the same as in September - a moderately hot 29.2°C (84.6°F). In October, the average low-temperature is 24°C (75.2°F).

Heat index

In October, the average heat index is appraised at a very hot 36°C (96.8°F). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'feels like', 'apparent temperature', or 'real feel', combines air temperature and relative humidity to represent a human perceived temperature equivalent. Additional factors like activity, pregnancy, differences in body mass, height, and shape, and wind affect individual temperature impact. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. With a lot of moisture in the air, the evaporation process is not as effective, and the body does not cool down as efficiently, creating a perception of overheating. When heat gain exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.

Humidity

With an average relative humidity of 82%, October is the most humid month in Port Royal.

Rainfall

October is the month with the most rainfall in Port Royal. Rain falls for 28.7 days and accumulates 184mm (7.24") of precipitation.

Sea temperature

In Port Royal, Jamaica, the average seawater temperature in October is 29.3°C (84.7°F).
Note: Water temperature between 25°C (77°F) and 29°C (84.2°F) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

Daylight

In Port Royal, Jamaica, the average length of the day in October is 11h and 44min.
On the first day of the month, sunrise is at 05:57 and sunset at 17:56. On the last day of October, sunrise is at 06:06 and sunset at 17:35 EST.

Sunshine

The average sunshine in October is 7.2h.

UV index

The months with the highest UV index are June through October, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV radiation for the ordinary person.
Note: In October, the average maximum UV index of 7 translate into the following recommendations:
Take precautions against overexposure. Protection against sun damage is needed. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.