June weather forecast
Kagoshima, Japan

June is when Kagoshima is in the full swing of summer, with the temperature reaching its peak and relative humidity levels at their highest. The weather is typically warm and humid, leading to an increase in sea temperature as well. This is the month of abundant sunshine, despite the increased downpour. The rainfall spikes to a staggering 452mm (17.8"), marking the peak of the rainy season. Despite the shortening daylight hours, the sunshine persists, contributing to the overall warmth of the locality.

Temperature

The transition into June shows a subtle variation to a still moderately hot 27.6°C (81.7°F) from May's 25.2°C (77.4°F) in the average high-temperature. Throughout the nights in June, Kagoshima experiences an average low-temperature of 21°C (69.8°F).

Heat index

The heat index value during June is calculated to be a tropical 31°C (87.8°F). With prolonged exposure and constant activity, one might feel exhausted and experience heat cramps.
Heat index readings emphasize conditions of light breezes and shaded spots. The heat index could experience an increase of 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'feels like' or 'apparent temperature', reflects the blend of air temperature and relative humidity to give a temperature impression. One's perception of temperature is subjective, varying based on their activity and individual heat perception, influenced by factors like wind, clothing, and metabolic variations. 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 quite important for children. Typically, children face more danger than adults as they usually perspire less. Their larger skin surface relative to their small bodies and increased heat output from their activities enhance their risk.

Humidity

June is the most humid month in Kagoshima, with an average relative humidity of 78%.

Rainfall

June is the month with the most rainfall. Rain falls for 14.6 days and accumulates 452mm (17.8") of precipitation.

Snowfall

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

Sea temperature

In Kagoshima, the average seawater temperature in June is 24.2°C (75.6°F).
Note: Individual preferences to cold, influenced by conditions such as sunshine, wind, and surrounding temperature, play a part in the comfort of swimming in 24.2°C (75.6°F) waters. (As an aside, Olympic swimming standards dictate water temperatures from 25°C (77°F) to 28°C (82.4°F).)

Daylight

June has the longest days of the year, with an average of 14h and 12min of daylight.
On the first day of June in Kagoshima, sunrise is at 05:13 and sunset at 19:17. On the last day of the month, sunrise is at 05:16 and sunset at 19:26 JST.

Sunshine

With an average of 4.1h of sunshine, June has the least sunshine of the year.

UV index

The months with the highest UV index in Kagoshima are June through August, with an average maximum UV index of 11. A UV Index reading of 11, and higher, represents an ultimate health vulnerability from exposure to the Sun's UV rays for the ordinary person.
Note: In June, the maximum UV index of 11 suggests these recommendations:
Undertake all critical precautions. Protection from sun harm is vital. Avoid direct Sun exposure and seek shade from 10 a.m. to 4 p.m., the period of highest UV radiation. Remember, however, that not all shade structures offer full protection. Always opt for UVA and UVB-resistant sunglasses on radiant days. Use liberally and reapply a broad-spectrum SPF 30+ sunscreen every two hours, or straight away after any outdoor workout or swim. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.