The league champions are promoted to Counties 3 Somerset North while relegated teams used to drop to Somerset 3 North but since the RFU Adult Competition Review now drop to local merit leagues.

Departing were Chew Valley III (champions) and Walcot II (3rd), promoted to Counties 3 Somerset North.

Departing were Old Redcliffians III and Imperial II, promoted to Counties 3 Somerset North.

Joining were Bristol Telephone Area, relegated from Counties 3 Somerset North.

Departing were Gordano II (champions), Clevedon II (3rd), Oldfield Old Boys (4th) and Bristol Telephone Area (7th) to Counties 3 Somerset North whilst Hornets III (runners-up) were promoted to Counties 3 Somerset South.

Winscombe II, who finished 6th in 2019–20, were level transferred to Somerset 2 South for the 2021–22 season.