late summer
Refers to the latter part of summer, typically August in modern usage. Often used in weather forecasts, seasonal descriptions, and literary contexts.
The late summer heat continues.
sixth month of the lunar calendar
Obsolete term for the sixth month of the old lunar calendar, roughly corresponding to July. Now only encountered in historical or classical contexts.
See also: 水無月
この花は晩夏に咲きます。
This flower blooms in late summer.
In the old lunar calendar, 晩夏 corresponds to the month of 水無月.
晩夏 marks the late, waning part of summer, the direct opposite end of the season from 初夏's early start.
Compound of 晩 (late) and 夏 (summer). The reading ばんか is the on'yomi of both characters.