September is dedicated to Jupiter (Iuppiter means "God Father") representing the sacralization of Authority in particular social and public authority, like his female polarity Juno.
Jupiter thus represents the State and the Family as social institutions. He represents, as cosmic energy, the sky, the rain, the snow, the lightning and the dew.
Sacred animals to Jupiter are the eagle and the vulture.
Sacred tree to Jupiter is the Oak: Jupiter may manifest himself through the whoosh of the oak's leaves
Jupiter has a long list of appellations (Indigitamenta) among which Lucetius (Light's Origin), Pluvius (raining), Fulgurator (Day Lightning) Summanus (Night Lightning), Pantocrator (Lord of anything), Trioculos (with three eyes), Prodigalis (prodigies Liberator), Penninus (Lord of peaks).
The main Jupiter's symbol is the Lightning.
The calendar for September mainly involves great public festivals and rites such as the Ludi Magni the most important aristocracy's ludi.
As private rites we can however cite:
- 10 september - Epulum Iovis: festivity celebrated to remind the fundation of the Temple of Iupiter in the Capitolium. It can be offered a rich meal citing also the Deities of the first triad (Mars and Quirinus) and the second triad (Minerua and Juno)
- 20 september - Romolus' Dies Natalis: this day can be celebrated with a domestic rite offering figs.
- 26 september - Venus Genitrix: this day is dedicated to Venus as mother of the entire roman people and defender of the Cultores worldwide
- 27 september - Fortuna Redux: "she bringing home" is celebrated for those friends and relatives living far away and to favor a safe journey back home.