noun, noun which may take the genitive case particle 'no'
sultry weather; hot and muggy with light overcast
Describes oppressive summer heat when the sky is slightly overcast, there is little wind, and humidity is high. Often used in weather reports or seasonal descriptions.
今日は朝から油照りで、じっとしていても汗が出る。
It's been sultry since this morning; I'm sweating even when I stay still.
油照りの午後、遠くで雷の音が聞こえた。
On that sultry afternoon, I heard thunder in the distance.
Compound of 油 (abura, 'oil') and 照り (teri, 'shining, glare'), suggesting a sticky, oppressive heat that feels like being coated in oil. The exact historical derivation is uncertain, but the imagery is vivid and conventional.