Here are the names that give me late summer vibes:
[name_f]Augusta[/name_f] (obviously [name_m]August[/name_m] is a late summer month in the Northern hemisphere but it’s also that it has ‘gust’ in there for the gusty winds that herald autumn)
[name_f]Tesni[/name_f] and [name_f]Tess[/name_f]
[name_m]Aurelian[/name_m], [name_f]Aurelia[/name_f]
[name_f]Felicity[/name_f], [name_m]Felix[/name_m]
[name_m]Hayes[/name_m]
[name_m]Woods[/name_m]
[name_f]Brinkley[/name_f]
[name_f]Maple[/name_f]
[name_m]Ochre[/name_m]
[name_f]Marigold[/name_f], [name_f]Rosegold[/name_f], [name_f]Rosaura[/name_f]
[name_m]Laith[/name_m]
[name_f]Lakelyn[/name_f]
[name_f]Asterope[/name_f] (for late summer storms)
[name_f]Waverley[/name_f] (makes me think of waving grasses)
[name_f]Vinita[/name_f], [name_m]Vincent[/name_m], [name_f]Lavinia[/name_f], [name_f]Alvinea[/name_f], [name_m]Vine[/name_m], [name_f]Vinyet[/name_f] 
Somerville
[name_f]Summerlee[/name_f]
Somerton
[name_f]Hazel[/name_f]
[name_f]Elodie[/name_f], [name_m]Eladio[/name_m]
[name_f]Garance[/name_f]
[name_m]Rye[/name_m]
[name_f]Vivia[/name_f]