Each day, Psalm 27 is traditionally recited at the end of the Shacharit and Ma'ariv services. One verse of Psalm 27, Achat Sha'alti, is included in Mishkan T'filah (MT 662). We continue reciting Achat Sha'alti through Hoshanah Rabah or Sh'mini Atzeret/Simchat Torah.
On weekdays, the shofar is sounded during the shacharit service after the recitation of Psalm 27. No blessing is recited. We sound T'kiah, followed by Sh'varim, T'ruah, and another T'kiah. The shofar is not traditionally sounded on Shabbat or on the morning of Erev Rosh Hashanah.
There is a custom to increase the giving of Tzedakah during this month (JL 117).
Add Ya'aleh v'Yavo to the Amidah (MT 254 or 331).
Recite Half Hallel after the Amidah (MT 560)
Numbers 28:9-15 (P 1213, RP 1082, WTC 977)
Isaiah 66:1-13, 23 (P 1684, RP 1492)
Add Ya'aleh v'Yavo to the Amidah (MT 354)
Add Ya'aleh v'Yavo and Harachaman for Rosh Chodesh