雨後 is read as うご (ugo) and means after rain.
うご
ugo
うごのたけのこ
similar things turning up one after another
はれのちあめ
clear then rain (e.g. weather forecast)
あめ
rain
うすい
"rain water" solar term (approx. February 19)
うてん
rainy weather
あまあがり
after the rain
うちゅう
in the rain
あと
after one's death
こんご
from now on
ごご
afternoon
うしろ
back
ぜんご
before and after