June weather forecast
Hiroshima, Japan

June signals the beginning of the monsoon season in Hiroshima with the rainfall reaching a high of 247mm (9.72"). The intensity and frequency of rainfall increase from May, signaling a shift in weather patterns. Despite the heightening rainfall, temperatures continue to rise, creating a humid and warm environment. The longer daylight hours continue, albeit with more clouds and rain. With the UV index reaching its peak, it's essential to take proper protection when going outside.

Temperature

June introduces a minor temperature shift, with average high-temperatures adjusting from May's 24.1°C (75.4°F) to a still warm 27.2°C (81°F). In the month of June, an average of 19.4°C (66.9°F) marks the low-temperature.

Heat index

Throughout June, the heat index is appraised at 29°C (84.2°F). With unrelenting exposure and activity, one might experience exhaustion, leading to potential heat cramps.
Thinking about the heat index, one should account for its values in shaded areas with gentle breezes. Being exposed to direct sunshine might trigger a heat index increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'feels like', is an estimation of the warmth sensation when considering humidity levels. The influence of weather can be personal, changing with an individual's body mass, height, and level of physical exertion. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for children. Children often fail to recognize the requirement to rest and rehydrate. Thirst, being a late symptom of dehydration, underlines the importance of maintaining hydration, especially during ongoing physical activities.

Humidity

In Hiroshima, Japan, the average relative humidity in June is 72%.

Rainfall

In June, in Hiroshima, Japan, the rain falls for 17 days. Throughout June, 247mm (9.72") of precipitation is accumulated. In Hiroshima, Japan, during the entire year, the rain falls for 190 days and collects up to 1538mm (60.55") of precipitation.

Snowfall

In Hiroshima, snow does not fall in April through November.

Sea temperature

In Hiroshima, in June, the average water temperature is 21°C (69.8°F).
Note: Swimming is not enjoyable for most people in water that is 21°C (69.8°F). As the temperature descends from 21°C (69.8°F) to 15°C (59°F), breathing control becomes harder.

Daylight

The month with the longest days is June, with an average of 14h and 24min of daylight.
On the first day of June, sunrise is at 04:58 and sunset at 19:17. On the last day of the month, sunrise is at 05:01 and sunset at 19:26 JST.

Sunshine

In Hiroshima, the average sunshine in June is 5.4h.

UV index

In Hiroshima, the average daily maximum UV index in June is 10. A UV Index reading of 8 to 10 represents a very high health risk from exposure to the Sun's UV rays for the average person.
Note: In June, a daily UV index of 10 turns into the following recommendations:
Taking safety measures is non-negotiable; skin and eyes can be swiftly affected if neglected. Avoid direct Sun exposure and stay in the shade between 10 a.m. and 4 p.m., a time when UV radiation is most intense, noting that not all shade structures offer full protection. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Before exposing yourself to the Sun, apply sunscreen with 30 SPF or higher. This safeguards against sunburn and its harmful radiation.