tempestivamente bedeutet auf Englisch

opportunely▼(in a manner convenient or advantageous at some particular time)
adverb
[UK: ˈɒ.pə.tjuːn.li] [US: ˈɒ.pə.tjuːn.li]

seasonably▼(at an opportune time)
adverb
[UK: seasona.bli] [US: seasona.bli]