May, the last month of the spring in
Yonaguni, is another warm month, with an average temperature ranging between min 23.2°C (73.8°F) and max 27.7°C (81.9°F).
Temperature
The commencement of May records an average high-temperature of a still warm 27.7°C (81.9°F), barely varying from
April's 25.2°C (77.4°F). In Yonaguni, May is characterized by an average low-temperature of 23.2°C (73.8°F), indicating a minor drop from daytime highs.
Heat index
The heat index value during May is evaluated at a hot 31°C (87.8°F). Constant activity during exposure could result in a state of weariness and possibly heat cramps.
Take into consideration that the heat index values are calculated for shade and light wind conditions. The heat index could experience an increase of 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'real feel' or 'apparent temperature', shows a temperature sensation when both heat and moisture conditions are combined. This effect is subjective, differing among individuals based on their physical activity and perception of heat, which can be influenced by factors like wind, clothing, and metabolic variances. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to children. Young ones often ignore the need to take a break and drink fluids. Thirst is a late-stage symptom of dehydration - hence, maintaining hydration, particularly during extended physical activities, is crucial.
Humidity
In May, the average relative humidity is 81%.
Rainfall
In Yonaguni, in May, 207mm (8.15") of precipitation is typically accumulated. During the entire year, Yonaguni aggregates up to 2353mm (92.64") of precipitation.
Sea temperature
In Yonaguni,
Japan, in May, the average water temperature is 27.3°C (81.1°F).
Note: Water temperature from 25°C (77°F) to 29°C (84.2°F) is considered very warm, making water activities enjoyable for prolonged periods without any uncomfortable sensations.
Daylight
In Yonaguni, the average length of the day in May is 13h and 20min.
On the first day of the month, sunrise is at 06:12 and sunset at 19:17. On the last day of May, in Yonaguni, sunrise is at 05:59 and sunset at 19:32 JST.
Sunshine
In May, the average sunshine is 4.5h.