early summer warmth; light heat of early summer
A literary seasonal word (初夏の季語) referring to the mild, pleasant warmth felt at the beginning of summer, before the intense heat sets in.
In this season of early summer warmth, how is everyone doing?
When I opened the window, a pleasant early-summer breeze came in.
Compound of 薄 (haku, 'light, thin') and 暑 (sho, 'heat'). The reading is on'yomi. The word is a literary coinage used as a seasonal term in haiku and formal writing.