From Aug 2, 2026 to Aug 6, 2026, the corresponding solar term in the Nijūshi Sekki (24 solar terms) is 大暑(Taisho), and the corresponding microseason in the Shichijūni Kō (72 microseasons) is 大雨時行(Taiu tokidoki ni furu).

What Is “Taiu tokidoki ni furu” (大雨時行)?

"Taiu Tokidoki ni Furu" (大雨時行, "great rains fall from time to time") is one of the seasonal divisions of the Shichijūni Kō (72 microseasons). It corresponds to the final microseason of "Taisho" (大暑, Great Heat) within the Nijūshi Sekki (24 solar terms) and generally falls between around August 2 and August 7 each year. The phrase "Taiu Tokidoki ni Furu" describes the natural phenomenon of sudden, intense rain showers occurring during the height of summer. In modern terms, it evokes the image of evening downpours or localized torrential rainstorms. During this period, the Japanese archipelago reaches peak humidity and heat. As the atmosphere becomes increasingly unstable, towering cumulonimbus clouds rapidly develop, bringing heavy rainfall to limited areas. The expression "Taiu Tokidoki ni Furu" originates from the Chinese calendrical text "Getsurei Shichijūnikō Shūkai" (月令七十二候集解) and was incorporated into Japan's seasonal culture as part of the Shichijūni Kō system. The mechanism behind these sudden showers perfectly reflects the natural cycle symbolized by this microseason: air heated intensely by the summer sun rises rapidly from the ground, forming powerful rain clouds and brief but heavy rainfall. Even in modern life, this time of year calls not only for precautions against heatstroke, but also for preparedness for sudden downpours, such as carrying a folding umbrella or taking measures against flooding in low-lying areas. Since ancient times, the Japanese people have carefully observed and recorded these subtle seasonal transitions through the Shichijūni Kō. "Taiu Tokidoki ni Furu" is also a poetic expression that allows one to sense the approach of summer's end within the sound of falling rain.

List of Japan’s 72 Microseasons