September weather forecast
Nagoya, Japan

September signals the onset of autumn in Nagoya. Rainfall hits its annual peak with a total of 234mm (9.21") of rain expected. The temperatures from the peak summer months make a gradual decline. Autumn colors start to peek through the lingering greenery. The seasonal transition leads to pleasant evenings with noticeable temperature drops.

Temperature

September's arrival signals a moderate reduction in the average high-temperature, easing from a hot 32.8°C (91°F) in August to a moderately hot 28.6°C (83.5°F). Nagoya experiences an average low-temperature of 20.7°C (69.3°F) in the month of September.

Heat index

September's average heat index is calculated to be a tropical 32°C (89.6°F). A sense of exhaustion might occur with extended exposure and activity, potentially causing heat cramps.
Metrics for the heat index primarily focus on shaded spots and light wind conditions. Heat index values might soar by up to 15 Fahrenheit (8 Celsius) degrees with exposure to direct sunshine.
Note: The heat index, also known as 'feels like' or 'apparent temperature', is a metric representing the sensation of warmth when air temperature and moisture come together. Additional elements encompassing metabolic differences, the degree of physical activity, and attire can impact the individual's perception of temperature. When in direct sunlight, one should be cautious as it can raise the heat index by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are of high significance for children. Children frequently do not comprehend the need for rest and hydration. Thirst is an advanced stage of dehydration - staying hydrated, especially during extended physical exercises, is essential.

Humidity

In September, the average relative humidity is 71%.

Rainfall

The month with the most rainfall in Nagoya, Japan, is September, when the rain falls for 11.9 days and typically aggregates up to 234mm (9.21") of precipitation.

Snowfall

In Nagoya, snow does not fall in March through November.

Sea temperature

In Nagoya, in September, the average water temperature is 27°C (80.6°F).
Note: For swimming, diving, and enjoying other water activities, the range of 25°C (77°F) to 29°C (84.2°F) in water temperature is considered ideal, offering pleasure for extended periods without discomfort.

Daylight

The average length of the day in September is 12h and 25min.
On the first day of the month, sunrise is at 05:25 and sunset at 18:19. On the last day of September, in Nagoya, sunrise is at 05:46 and sunset at 17:38 JST.

Sunshine

June and September, with an average of 5h of sunshine, are months with the least sunshine in Nagoya, Japan.

UV index

In September, the average daily maximum UV index in Nagoya is 8. A UV Index estimate of 8 to 10 represents a very high health vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.
Note: During September, 8 as the daily maximum UV index converts into the following advice:
Act with caution. Neglecting protection can lead to skin and eye damage in moments. Stay out of direct sunlight between 10 a.m. and 4 p.m., when UV radiation is most intense, and remember that not all shade structures provide complete protection. Enhance your sun protection with tightly woven, yet airy clothing. Caution! The mirror effect of sand and water ups the UV radiation strength.