June weather forecast
Naha, Japan

In June, Naha, Japan, welcomes the summer season with heightened temperatures and increased humidity levels. Despite a rise in temperatures, the city sustains a reasonable climate suitable for typical summer activities. Coincidentally, the pattern of incremental increases in rainfall persists with a total downpour of 247mm (9.72"). Extended sunshine hours add cheer to the environment, magnifying the city's allure. The late afternoon and evening showers often render a refreshing break from the daytime heat.

Temperature

In June, Naha's weather conditions record an average high-temperature of a still warm 29.4°C (84.9°F), demonstrating little divergence from the preceding month. Naha records a slight downturn to an average a still warm 24.8°C (76.6°F) during the nights of June.

Heat index

Throughout June, the heat index is estimated at a very hot 37°C (98.6°F). Incorporate additional preventive steps, heat exhaustion and heat cramps are possible. Long-lasting activity may cause heatstroke.
It is crucial to understand that heat index figures are for shade and gentle 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 'apparent temperature' or 'felt air temperature', blends air temperature and moisture content to represent the felt temperature to humans. A person's impression of weather can be swayed by numerous aspects, among them metabolic variations, pregnancy, and activity levels. Take note that direct exposure to the sun can increase the felt temperature, possibly adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are quite important 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.
The human body normally cools itself by perspiration, as evaporated sweat carries heat away from the body. With excessive moisture in the atmosphere, the effectiveness of the evaporation process is decreased, causing the body to cool down less efficiently, leading to a sensation of overheating. Heat-related challenges, like dehydration, can be anticipated when body heat isn't managed effectively.

Humidity

The most humid month in Naha, Japan, is June, with an average relative humidity of 83%.

Rainfall

In Naha, in June, it is raining for 11.7 days, with typically 247mm (9.72") of accumulated precipitation. In Naha, during the entire year, the rain falls for 140.8 days and collects up to 2037mm (80.2") of precipitation.

Sea temperature

In June, the average sea temperature is 26.6°C (79.9°F).
Note: For any water activity, surface water temperatures between 25°C (77°F) and 29°C (84.2°F) are considered as excellent and extremely pleasant for lengthened periods.

Daylight

The month with the longest days is June, with an average of 13h and 48min of daylight.
On the first day of June in Naha, sunrise is at 05:36 and sunset at 19:17. On the last day of the month, sunrise is at 05:40 and sunset at 19:25 JST.

Sunshine

In Naha, the average sunshine in June is 5.5h.

UV index

May through August, with an average maximum UV index of 12, are months with the highest UV index. A UV Index estimate of 11, and higher, represents an extreme threat to health from exposure to the Sun's UV rays for the ordinary person.
Note: In June, a daily UV index of 12 turns into the following recommendations:
Employ all critical precautions. Guarding against sun damage is essential. During the period from 10 a.m. to 4 p.m., UV radiation is highest. Try to avoid direct sunlight during these hours. Tightly woven clothing, when worn loosely, shields effectively against the Sun. Even if it's cloudy, generously apply and frequently reapply a sunscreen with no less than a 30 sun protection factor after each swim or outdoor exercise. Warning! The Sun's UV rays intensify with reflections from sand and water.