July weather forecast
Yokohama, Japan

July is characteristically the warmest month in Yokohama with average daily high temperatures peaking at 28.2°C (82.8°F). The monsoon showers from June persist, leading to high humidity levels that could feel oppressive for those unaccustomed to such conditions. However, this month receives the highest UV Index, prompting suitably significant measures for sun protection. Despite the heat and high humidity, residents and visitors can make the most of approximately 14.3 hours of daylight. Yokohama's city skyline is often clear and sunny, encouraging residents and visitors to explore the delights of summer.

Temperature

July introduces a minor temperature shift, with average high-temperatures adjusting from June's 24.2°C (75.6°F) to a still moderately hot 28.2°C (82.8°F). Yokohama navigates through July with a barely noticeable decrease in temperature at night, stabilizing at a still moderately hot 23.5°C (74.3°F).

Heat index

For July, the heat index is calculated to be a tropical 33°C (91.4°F). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Observations indicate that the heat index values are for shady locations with light wind. Direct exposure to sunlight could raise the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', represents the fusion of temperature and moisture in the air to suggest how warm it feels. This effect is personal, shaped by the individual's physical activity and heat sensitivity, influenced by factors including wind, clothing, and metabolic variances. Direct sun rays have a notable impact on perceived temperature, which can raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values hold great significance to children. Children regularly disregard the necessity to rest and replenish fluids. Thirst is a late symptom of dehydration - thus, maintaining hydration, particularly during long-lasting physical activities, is essential.

Humidity

July is the most humid month, with an average relative humidity of 80%.

Rainfall

In Yokohama, in July, during 15.8 rainfall days, 87mm (3.43") of precipitation is typically accumulated. In Yokohama, during the entire year, the rain falls for 160.5 days and collects up to 884mm (34.8") of precipitation.

Snowfall

April through December are months without snowfall in Yokohama.

Sea temperature

In Yokohama, in July, the average water temperature is 24.8°C (76.6°F).
Note: Individual preferences to cold, influenced by conditions such as sunshine, wind, and surrounding temperature, play a part in the comfort of swimming in 24.8°C (76.6°F) waters. (As an aside, Olympic swimming standards dictate water temperatures from 25°C (77°F) to 28°C (82.4°F).)

Daylight

In Yokohama, the average length of the day in July is 14h and 17min.
On the first day of the month, sunrise is at 04:30 and sunset at 19:00. On the last day of July, sunrise is at 04:49 and sunset at 18:46 JST.

Sunshine

In July, the average sunshine in Yokohama is 9.7h.

UV index

July is the month with the highest UV index in Yokohama, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high threat to health from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The UV index of 7 during July leads to these advisories:
Act on precautions and pay attention to sun safety recommendations. Avoidance of sunburn is obligatory. 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. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear. Caution! The Sun's UV rays become stronger due to reflections from water and sand.