September, the first month of the autumn in
Minamitorishima, is still a hot month, with an average temperature fluctuating between 26.1°C (79°F) and 31°C (87.8°F).
Temperature
The transition into September brings an average high-temperature of a still tropical 31°C (87.8°F) that remains consistent with
August. Minamitorishima's September nights demonstrate minimal variation from the daytime temperatures, with an average of 26.1°C (79°F).
Heat index
During September, the heat index is appraised at an extremely hot 40°C (104°F). Special measures are necessary to avoid heat cramps and heat exhaustion. Persistent activity could result in heatstroke.
In terms of the heat index, values are set with light wind and shade conditions in mind. Direct sunlight might lead to a heat index increase by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'apparent temperature', is a composite of temperature and humidity figures to convey how warm it feels. An individual's perception of weather can be swayed by a variety of elements including metabolic differences, pregnancy status, and their level of physical exertion. Consider the sun's direct rays and their impact; they can potentially increase the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are essentially critical for children. Juveniles are regularly less conscious of the need to recuperate and rehydrate. Thirst is a tardy symptom of dehydration - hydration, especially during lengthy physical activities, should be maintained.
Sweat evaporation, driven by perspiration, is the method the human body uses to rid itself of excessive warmth. Increased relative humidity slows down evaporation, thereby decreasing the rate of heat removal from the body, culminating in a sensation of overheating. When body temperature rises due to excess heat gain beyond its removal capability, one might experience heat-related disorders.
Humidity
The average relative humidity in September is 78%.
Rainfall
In Minamitorishima, in September, during 14.2 rainfall days, 100mm (3.94") of precipitation is typically accumulated. Throughout the year, there are 130.2 rainfall days, and 1050mm (41.34") of precipitation is accumulated.
Daylight
In September, the average length of the day is 12h and 18min.
On the first day of September in Minamitorishima, sunrise is at 04:25 and sunset at 17:02. On the last day of the month, sunrise is at 04:35 and sunset at 16:32 JST.
Sunshine
The average sunshine in September in Minamitorishima is 8.6h.