September weather forecast
Izumo, Japan

September, the first month of the autumn in Izumo, is also a moderately hot month, with an average temperature fluctuating between 26°C (78.8°F) and 18°C (64.4°F).

Temperature

With the onset of September, Izumo's average high-temperature slightly adjusts, moderately receding from August's tropical 30°C (86°F) to a moderately hot 26°C (78.8°F). Throughout September, Izumo's nights cool down to an average of 18°C (64.4°F).

Rainfall

In Izumo, during September, the rain falls for 18 days and regularly aggregates up to 207mm (8.15") of precipitation. Throughout the year, in Izumo, there are 224 rainfall days, and 1774mm (69.84") of precipitation is accumulated.

Sea temperature

In Izumo, Japan, the average seawater temperature in September is 25°C (77°F).
Note: For swimming, diving, and various water activities, the temperatures ranging from 25°C (77°F) to 29°C (84.2°F) are seen as highly enjoyable and comfortable for extended durations without any discomfort.

Daylight

In September, the average length of the day in Izumo is 12h and 25min.
On the first day of September in Izumo, sunrise is at 05:41 and sunset at 18:36. On the last day of the month, sunrise is at 06:03 and sunset at 17:54 JST.

Sunshine

The average sunshine in September in Izumo is 5h.

UV index

In Izumo, Japan, the average daily maximum UV index in September is 8. A UV Index estimate of 8 to 10 represents a very high health risk from unsafe exposure to UV radiation for the average person.
Note: The daily high UV index of 8 in September translates into this advice:
Taking safety measures is non-negotiable; skin and eyes can be swiftly affected if neglected. To the best of your ability, limit your exposure to the sun between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage. Beware! Reflections from sand and water can intensify the Sun's UV radiation.