To describe something of short duration we say “It’s short-lived”. Spanish uses a weather related saying, as in “Pasa como una nube de verano”, which literally means “It passes (goes by) like a cloud of summer”.
Here are some idioms with a common theme involving saints, weather, ethnicity and fruit.
“Veranillo de San Juan” literally means “Little summer of Saint John”. The idiomatic translation is “warm spell in June”. The only similar saying in English that I can think of is “dog days of summer”. “Veranillo de San Martin (San Miguel)” has as its equivalent in English “Indian summer”. Another Spanish version is “veranillo del membrillo”, a “membrillo” being a “quince”.
