July weather forecast
Okayama, Japan

July stands tall as the warmest month in Okayama with temperatures skyrocketing to a significant high of 31.4°C (88.5°F). Despite the heat, it also brings about the highest humidity of the year with a reading of 73%. The rainfall lessens in comparison to the previous month, falling to a total of 161mm (6.34") rain distributed over 17 days. While on one hand, the scorching temperatures can be uncomfortable during the day, on the other, the evening coolness and the beauty of illuminated Okayama Castle under clear skies offer a memorable spectacle.

Temperature

In Okayama, the average high-temperature in July slightly increases from a warm 27.7°C (81.9°F) in June to a hot 31.4°C (88.5°F). July nights are marked by an average temperature drop to a moderately hot 23.7°C (74.7°F).

Heat index

July's heat index is computed to be a blisteringly hot 40°C (104°F). Adopt enhanced safety measures, heat exhaustion and heat cramps could occur. Continuous activity may induce heatstroke.
Heat index's context suggests values are appropriate for shady areas and slight breezes. Direct sunlight can cause a surge in the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. This effect is subjective, differing among individuals based on their physical activity and perception of heat, which can be influenced by factors like wind, clothing, and metabolic variances. Direct sunlight exposure should be noted as it has the potential to increase the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical for babies and toddlers. Children often miss understanding the importance of rest and rehydration. Thirst usually appears late during dehydration - therefore, maintaining hydration, particularly during long physical activities, is essential.
Perspiration is the body's default response to elevated temperatures, as it promotes the evaporation of sweat to achieve cooling. With an abundance of moisture present in the air, the process of evaporation becomes less effective, and the body fails to cool down as it should, leading to the sensation of overheating. Excessive heat gain, when not shed effectively by the body, can result in increasing body temperatures and related hazards.

Humidity

The most humid month in Okayama is July, with an average relative humidity of 73%.

Rainfall

In Okayama, in July, it is raining for 17 days, with typically 161mm (6.34") of accumulated precipitation. Throughout the year, in Okayama, there are 189 rainfall days, and 1106mm (43.54") of precipitation is accumulated.

Snowfall

April through December are months without snowfall in Okayama.

Sea temperature

In July, the average sea temperature is 25.4°C (77.7°F).
Note: For activities such as swimming and diving, temperatures between 25°C (77°F) and 29°C (84.2°F) are perceived as particularly pleasant and satisfying for prolonged periods without feeling uneasy.

Daylight

In July, the average length of the day is 14h and 13min.
On the first day of the month, sunrise is at 04:55 and sunset at 19:21. On the last day of July, in Okayama, sunrise is at 05:13 and sunset at 19:07 JST.

Sunshine

In Okayama, the average sunshine in July is 5.5h.

UV index

The month with the highest UV index in Okayama is July, with an average maximum UV index of 11. A UV Index of 11, and more, symbolizes an extreme health hazard from exposure to the Sun's UV radiation for average individuals.
Note: In July, the maximum UV index of 11 suggests these recommendations:
Employ every precaution of importance, unprotected skin and eyes could burn within moments. Attempt to stay under shade and limit exposure to the Sun between 10 a.m. and 4 p.m., when UV radiation is at its peak. Remember, devices such as parasols or canopies might not provide complete sun protection. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key. After a swim or outdoor exercise, one should liberally reapply broad-spectrum sunscreen with a sun protection factor of 30 or higher. Beware! Reflecting off water and sand, UV rays are much stronger.