July weather forecast
Naha, Japan

July in Naha marks the peak of the summer season. The city experiences heightened temperatures adding a distinct fervor to the city's vibrant summer fiesta. Interestingly enough, July experiences a decrease in rainfall to 141mm (5.55"), providing a much-needed respite from June's heavy downpour. With warm sea temperatures and longer daylight hours, July remains a favorite for beach goers and sun enthusiasts. The eclectic mix of humidity, heat, and rainfall lends a unique persona to Naha’s skyline in July.

Temperature

In Naha, July is the warmest month, with temperatures averaging a high of 31.8°C (89.2°F) and a low of 26.8°C (80.2°F).

Heat index

The average heat index in July is estimated at a blisteringly hot 43°C (109.4°F). Observe: Heat exhaustion and heat cramps are probable. Heatstroke is on the horizon with prolonged exertion.
One should be cognizant that the heat index values are tailored for shaded spots and mild winds. Direct sunlight can potentially boost the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', is found by incorporating humidity levels into the air temperature measurement. One's perception of temperature can vary depending on physical activity and individual heat sensitivity, influenced by factors like wind, attire, and metabolic variations. It is noteworthy to mention that direct sunlight exposure can augment the felt temperature, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold great significance to children. Young individuals are typically more threatened than adults due to their reduced perspiration. Also, the larger skin surface proportionate to their small bodies and the increased heat from their activities magnify their risk.
Perspiration, followed by sweat evaporation, is the human body's chief method to maintain a balanced temperature. In conditions of both high temperature and humidity (a high heat index), sweating is limited and the perception of heat is enhanced. When heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.

Humidity

In July, the average relative humidity is 78%.

Rainfall

In Naha, in July, during 10.4 rainfall days, 141mm (5.55") of precipitation is typically accumulated. Throughout the year, in Naha, there are 140.8 rainfall days, and 2037mm (80.2") of precipitation is accumulated.

Sea temperature

In July, the average sea temperature in Naha, Japan, is 28.2°C (82.8°F).
Note: With water temperature from 25°C (77°F) to 29°C (84.2°F), all water activities are comfortable and delightful, devoid of discomfort even for lengthened periods.

Daylight

The average length of the day in July is 13h and 36min.
On the first day of the month, sunrise is at 05:40 and sunset at 19:25. On the last day of July, in Naha, sunrise is at 05:54 and sunset at 19:16 JST.

Sunshine

With an average of 7.7h of sunshine, July has the most sunshine of the year.

UV index

The months with the highest UV index in Naha, Japan, are May through August, with an average maximum UV index of 12. A UV Index value of 11, and more, symbolizes an excessive health risk from exposure to the Sun's UV rays for the ordinary person.
Note: The daily high UV index of 12 during July translates into the following recommendations:
Adopt all essential precautions. Preventing sun harm is crucial. The Sun's UV radiation is most intense from 10 a.m. to 4 p.m. Try to avoid direct sun exposure during these hours. During bright days, sunglasses that offer UVA and UVB defense are recommended. Ensure the liberal application and reapplication of a broad-spectrum SPF 30+ sunscreen after each outdoor activity or swim, and every two hours. Be cautious! Sand and water surfaces make the Sun's UV rays more potent.