August weather forecast
Osaka, Japan

Heat continues to dominate the weather in August, with temperatures in Osaka occasionally peaking at 33.4°C (92.1°F). Though the humidity eases a bit from July's high of 70%, the weather remains palpably sticky. Compared to the previous month, rain showers are not as frequent, leading to lower monthly rainfall totals. Despite the decrease in tropical rain, days are still extended, enhancing outdoor loving lifestyles. The sea’s highest temperature is reached in August, furthering Osaka's appeal as a getaway spot.

Temperature

Osaka's warmest weather arrives in August, when temperatures average a high of 33.4°C (92.1°F) and a low of 25.4°C (77.7°F).

Heat index

The heat index value during August is appraised at an extremely hot 43°C (109.4°F). Remain alert: Heat exhaustion and heat cramps are predicted. Extended effort can lead to heatstroke.
It is crucial to understand that heat index figures are for shade and gentle wind conditions. The heat index values could be amplified by up to 15 Fahrenheit (8 Celsius) degrees in direct sunlight.
Note: The heat index, also known as 'feels like' or 'real feel', combines both the air temperature and the humidity level to give a perceived human temperature. The influence of weather is personal, differing among individuals based on variations in body mass, stature, and the degree of physical exertion. When directly under the sun, the weather's impact can intensify, possibly boosting the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular significance for children. Youngsters frequently overlook the need for breaks and fluid intake. Thirst is an advanced sign of dehydration - thereby highlighting the importance of keeping hydrated, particularly during long physical activities.
To offset high temperatures, the human body releases sweat which, upon evaporation, cools it down. In the presence of high relative humidity, the evaporation rate diminishes, resulting in the body retaining more warmth compared to dry conditions. Increasing body temperatures can be a precursor to dehydration if the body can't shed the extra heat.

Humidity

In Osaka, the average relative humidity in August is 66%.

Rainfall

In August, in Osaka, Japan, the rain falls for 6.9 days. Throughout August, 91mm (3.58") of precipitation is accumulated. In Osaka, during the entire year, the rain falls for 98.1 days and collects up to 1279mm (50.35") of precipitation.

Snowfall

March through December are months without snowfall.

Sea temperature

The month with the warmest seawater in Osaka is August, with an average sea temperature of 27.7°C (81.9°F).
Note: Surface water temperatures falling between 25°C (77°F) and 29°C (84.2°F) are regarded as prime and extremely agreeable for enduring periods during any water activity.

Daylight

The average length of the day in August in Osaka is 13h and 26min.
On the first day of the month, sunrise is at 05:08 and sunset at 19:00. On the last day of August, sunrise is at 05:30 and sunset at 18:26 JST.

Sunshine

August has the most sunshine of the year in Osaka, with an average of 7h of sunshine.

UV index

The average daily maximum UV index in August is 10. A UV Index reading of 8 to 10 represents a very high health risk from unsafe exposure to UV radiation for the ordinary person.
Note: The maximum daily UV index of 10 in August converts into the following recommendations:
Ensure you're always protected. Unprotected skin can get damaged in moments. Limit direct sun exposure especially between 10 a.m. and 4 p.m., when UV radiation is at its peak. However, keep in mind that shade structures may not provide full sun protection. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days. Even when the sky is cloudy, apply generously and frequently reapply a sunscreen with SPF 30 or more, especially post every swim or outdoor exercise. Stay cautious! Sand and water reflections increase UV radiation potency.