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 carries its own melody nurturing vibrant flora and fauna.

Temperature

Okayama's June weather indicates a minor increase in high-temperatures, edging from May's 24.4°C (75.9°F) to a still warm 27.7°C (81.9°F). In Okayama, the June nights cool down to an average low of 19.4°C (66.9°F).

Heat index

June's mean heat index is estimated at a hot 30°C (86°F). Staying active during long-term exposure might result in a state of exhaustion and cause heat cramps.
When referencing the heat index, its values are suitable for shady environments and light breezes. If exposed to direct sunlight, the heat index could climb by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', is a measure that combines air temperature and relative humidity into a single value that indicates how hot the weather feels. The effect is experienced differently by individuals, hinging on unique characteristics such as body mass, stature, and level of activity. Recognize that direct exposure to the sun can escalate the heat effect, potentially adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are particularly meaningful for babies and toddlers. 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

In June, the average relative humidity is 69%.

Rainfall

The month with the most rainfall is June, when the rain falls for 17 days and typically aggregates up to 172mm (6.77") of precipitation.

Snowfall

April through December are months without snowfall.

Sea temperature

In Okayama, in June, the average water temperature is 21.8°C (71.2°F).
Note: The majority of individuals do not enjoy swimming in water that is 21.8°C (71.2°F). Breathing control becomes more challenging as the water temperature dips from 21°C (69.8°F) to 15°C (59°F).

Daylight

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

Sunshine

The average sunshine in June is 5.3h.

UV index

In Okayama, the average daily maximum UV index in June is 10. A UV Index estimate of 8 to 10 represents a very high threat to health from exposure to the Sun's UV radiation for average individuals.
Note: The maximum UV index of 10 during June leads to these instructions:
Immediate precautions are necessary; otherwise, skin and eyes might get damaged quickly. Seek shade and limit direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation. Keep in mind that shade structures like parasols or canopies do not offer complete sun protection. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly. For optimal sun protection, use sunscreen of no less than 30 SPF. This not only prevents sunburn but also reduces radiation damage. Alert! UV radiation becomes sharper due to reflections from sand and water.