day with a high of 30°C or above; tropical day
A meteorological term for a day when the maximum temperature reaches 30°C or higher. Often used in summer weather reports. Compare with 夏日 (25°C+) and 猛暑日 (35°C+).
Today is expected to be a day with a high of 30°C or above.
今年初めての真夏日を記録した。
We recorded the first tropical day of the year.
Today Tokyo had a high of 30°C or above.
It's been one 30°C-plus day after another this week.
This area recorded a high of 30°C or above already in May.