Shirabe
Español jmdict
1
noun (common) (futsuumeishi) primeros diez días de un mes
English jmdict
1
noun (common) (futsuumeishi) first third of a month;first ten days of a month
7月の上旬は、海に行くのは早いかな?
I wonder if the first week or so of July is too early to go to the beach.