June weather forecast
Okayama, Japan

The weather takes a turn in June with Okayama city experiencing hotter conditions, with temperatures accelerating to 27.7°C (81.9°F). Increased humidity turns the cityscape into a moist greenhouse supporting the thriving foliage. Periods of rainfall and higher temperatures announc the onset of the city's rainy season. The plentiful daylight continues to allow for extended hours of activity. Amidst the warmth and drizzles, June in Okayama carries its own melody nurturing vibrant flora and fauna.

Temperature

Okayama's transition into June is noticed by a slight rise in the average high-temperature, advancing from a warm 24.4°C (75.9°F) in May to a still moderately hot 27.7°C (81.9°F). During the month of June, an average temperature of 19.4°C (66.9°F) is noted during the nights.

Heat index

The heat index in June is computed to be a tropical 30°C (86°F). When exposure and activity are sustained, they could induce fatigue, with a chance of heat cramps.
It is important to note that the heat index values are for shaded areas and light wind scenarios. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', shows a temperature sensation when both heat and moisture conditions are combined. Additional factors encompassing metabolic differences, the level of physical activity, and clothing can impact the individual's perception of temperature. In direct sunlight, the heat's impact can be heightened, potentially leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values remain especially vital for babies and toddlers. 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.

Humidity

In June, the average relative humidity is 69%.

Rainfall

June is the month with the most rainfall. Rain falls for 17 days and accumulates 172mm (6.77") of precipitation.

Snowfall

In Okayama, snow does not fall in April through December.

Sea temperature

In Okayama, the average seawater temperature in June is 21.8°C (71.2°F).
Note: The enjoyment of swimming decreases for most when the surface water temperature is 21.8°C (71.2°F). Breathing control becomes increasingly challenging as temperatures descend below 21°C (69.8°F).

Daylight

With an average of 14h and 24min of daylight, June has the longest days of the year in Okayama.
On the first day of the month, sunrise is at 04:52 and sunset at 19:12. On the last day of June, in Okayama, sunrise is at 04:54 and sunset at 19:21 JST.

Sunshine

In Okayama, the average sunshine in June is 5.3h.

UV index

In June, the average daily maximum UV index in Okayama is 10. A UV Index value of 8 to 10 symbolizes a very high threat to health from exposure to the Sun's UV rays for the ordinary person.
Note: In June, an average UV index of 10 transforms into the following instructions:
Swift harm can befall unprotected skin and eyes. Prioritize safety. Stay out of direct sunlight between 10 a.m. and 4 p.m., when UV radiation is most intense, and remember that not all shade structures provide complete protection. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear. Before exposing yourself to the Sun, apply sunscreen with 30 SPF or higher. This safeguards against sunburn and its harmful radiation. Take note! The UV strength of the Sun elevates when reflected off water and sand.