September weather forecast
Fukuoka, Japan

Cooling trends characterize September as Fukuoka transitions into Autumn, providing a respite from the summer heat. Silvergrass fields shimmering in the sunlight are a common sight, making the city even more picturesque. The sea temperature, while still high, gradually decreases from the summer peak. Rainfall also exhibits a decrement, dropping to 175mm (6.89") from the summer deluge. As October nears, Fukuoka looks forward to pleasant weather with a significant drop in rainfall.

Temperature

September in Fukuoka, Japan, indicates a minor shift in the average high-temperature, from August's hot 31.6°C (88.9°F) to a moderately hot 27.8°C (82°F). Fukuoka's nighttime temperature during September is consistently averaged at an agreeable 20.6°C (69.1°F).

Heat index

For September, the heat index is calculated to be a tropical 31°C (87.8°F). Enduring exposure and unrelenting activity might cause a state of weariness, potentially leading to heat cramps.
Heat index evaluations are typically in the context of light winds and shaded environments. A rise in the heat index by 15 Fahrenheit (8 Celsius) degrees may result from direct sunlight exposure.
Note: The heat index, also known as 'real feel' or 'apparent temperature', gives a temperature feeling by integrating air temperature and humidity. A person's impression of weather can be shaped by several aspects, among them metabolic variations, pregnancy, and levels of physical activity. Recognize that direct exposure to the sun can escalate the heat effect, potentially adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are extremely significant for children. 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.

Humidity

The average relative humidity in September in Fukuoka, Japan, is 74%.

Rainfall

In September, in Fukuoka, the rain falls for 10.9 days. Throughout September, 175mm (6.89") of precipitation is accumulated. In Fukuoka, during the entire year, the rain falls for 128.6 days and collects up to 1632mm (64.25") of precipitation.

Snowfall

In Fukuoka, snow does not fall in April through December.

Sea temperature

In Fukuoka, the average seawater temperature in September is 26°C (78.8°F).
Note: Water temperatures from 25°C (77°F) to 29°C (84.2°F) make swimming, diving, and similar activities highly pleasurable and enjoyable for long periods without discomfort.

Daylight

In September, the average length of the day in Fukuoka is 12h and 23min.
On the first day of September in Fukuoka, sunrise is at 05:52 and sunset at 18:44. On the last day of the month, sunrise is at 06:12 and sunset at 18:04 JST.

Sunshine

In Fukuoka, Japan, the average sunshine in September is 5.3h.

UV index

The average daily maximum UV index in September in Fukuoka, Japan, is 8. A UV Index estimate of 8 to 10 represents a very high threat to health from unprotected exposure to Sun's UV rays for average individuals.
Note: In September, the average maximum UV index of 8 translates into the following recommendations:
Immediate care is essential; skin and eyes can be harmed in no time without it. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes. Be attentive! The UV exposure is heightened with reflections from sand and water.