September weather forecast
Kagoshima, Japan

In September, Kagoshima begins to transition from summer to autumn. Despite a slight drop in the average high temperatures compared to August, the weather remains substantially warm. This month, daylight gradually decreases, leading Kisarazu to retract from its peak summer phase. Rainfall remains high, retaining the moisture in the atmosphere. The significant decrease in sea temperature from 32.5°C (90.5°F) to 30.1°C (86.2°F) marks the change in seasons.

Temperature

The advent of September in Kagoshima brings an average high-temperature of a still tropical 30.1°C (86.2°F), almost identical to the preceding month. Kagoshima experiences a nighttime temperature average of 22.8°C (73°F) during September.

Heat index

During September, the heat index is calculated to be a torrid 36°C (96.8°F). Implement enhanced safety actions, heat cramps and heat exhaustion could occur. Sustained activity might result in heatstroke.
Always consider that heat index estimations are for light winds and places in the shade. Direct sunlight has the potential to heighten heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', ties air temperature with relative humidity to produce the perceived temperature sensation. One's perception of weather can be shaped by other factors, involving metabolic differences, pregnancy, and physical exertion. Always consider that direct sunlight exposure might heighten the heat's effects, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are primarily vital for children. Young ones are generally more prone to risk than adults due to their reduced ability to sweat. Their large skin surface area relative to their diminutive bodies and elevated heat production from their activities further enhance this risk.
The natural method the human body uses to remove excess heat is by perspiring and letting sweat evaporate. A surge in relative humidity can disrupt the body's normal cooling function by slowing evaporation, hence reducing the rate at which the body cools and intensifying the perception of heat. When body heat isn't effectively managed, risks of dehydration and overheating amplify.

Humidity

In September, the average relative humidity is 73%.

Rainfall

In Kagoshima, during September, the rain falls for 10.2 days and regularly aggregates up to 211mm (8.31") of precipitation. Throughout the year, there are 119.7 rainfall days, and 2266mm (89.21") of precipitation is accumulated.

Snowfall

In Kagoshima, Japan, snow does not fall in March through November.

Sea temperature

In Kagoshima, in September, the average water temperature is 27.4°C (81.3°F).
Note: For any water activity, the surface water temperatures in the range of 25°C (77°F) to 29°C (84.2°F) are deemed excellent and incredibly pleasant for longer durations.

Daylight

In Kagoshima, the average length of the day in September is 12h and 22min.
On the first day of the month, sunrise is at 05:53 and sunset at 18:41. On the last day of September, in Kagoshima, Japan, sunrise is at 06:11 and sunset at 18:04 JST.

Sunshine

The average sunshine in September is 5.6h.

UV index

In Kagoshima, the average daily maximum UV index in September is 9. A UV Index value of 8 to 10 symbolizes a very high health vulnerability from exposure to the Sun's UV rays for average individuals.
Note: The UV index of 9 during September translates into the following guidance:
It is essential to prioritize protection. Unprotected skin and eyes can suffer rapid harm. Stay out of direct sunlight and seek shade between 10 a.m. and 4 p.m., when UV radiation is strongest, but remember that shade devices may not offer full sun protection. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly. Apply liberally and reapply a broad-spectrum sunscreen of SPF 30+ every two hours, and promptly after any outdoor workout or a swim. Caution! The reflection of sand and water significantly amplifies the Sun's UV radiation.