Barometric Pressure Forecast for Setagaya City, Japan
Barometric pressure forecast for Setagaya City, Japan — on the Musashino terrace above the Tama River in western Tokyo. See current barometric pressure and what it means for weather-sensitive people.
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Pressure and weather in Setagaya City
Setagaya occupies the gently sloping Musashino upland in the western part of Tokyo, high enough above the Tama River to escape the bayside humidity of the central wards but still firmly inside the metropolitan heat island. Japan gives its weather-sensitive residents a vocabulary for this subject that English lacks, and the local term kiatsu-byo, meaning pressure illness, reflects how seriously the effect is taken here. Three seasons dominate the barometer. The tsuyu rainy front stalls over the Kanto plain through June and early July, holding pressure low and humidity high for weeks with only small daily variation. Typhoon season follows from August into October and produces the largest falls the city sees, commonly twenty-five to forty hPa as a system tracks up the Pacific coast, with the Tama River a genuine flood risk when a storm stalls over the hills to the west. Winter reverses everything: the Siberian High builds over the continent and pushes dry, clear, cold northwesterlies across the Kanto plain under high and steady pressure, broken occasionally by a south-coast low that brings the city its rare and disruptive snow.
What this means for you
Typhoon approaches produce the steepest falls on this list outside the North Atlantic, and they are forecast days in advance. Using a barometric pressure forecast to plan around the approach window is the practical advantage here.