夏

summer purification rites (held at shrines on the last day of the 6th lunar month)

summertime

summer slump

summer school

early chrysanthemums

losing weight over the summer

room arranged for the summer (by removing screens and doors to improve air flow)

booklet with homework assignments for the summer vacation

summer silkworms

Japanese stewartia (Stewartia pseudocamellia)

hardy amaryllis (Lycoris squamigera); resurrection lily; surprise lily; magic lily

suffering from summer heat

daylight saving time; daylight savings time; summer time

Buddhism

summer retreat where monks stay in the same place to study

Millettia japonica (species of flowering plant)

Summer Olympics; Summer Olympic Games

goumi (species of oleaster, Elaeagnus multiflora); cherry silverberry

summer daikon

summer term (of school); summer quarter

natsumikan (Citrus natsudaidai); Japanese summer orange

university summer school; college summer school

crops planted in summer

summer fires and winter fans; useless things

Internet slang; Derogatory

summerfag; young and inexperienced user who joins an online community during the summer