A limited number of seats in the 200 level at the Coliseum are covered and shaded during day games. Specifically, rows 12 and above in the infield bowl are covered. To find shade for an afternoon game, you'll want to sit even further back in Rows 15-18 and above and you'll want to completely avoid the first base side of the field.
Since Section 220 is on the third base side of the field, it will receive shade in its highest rows for a 1:00 game on the first day of summer. To learn more about covered seating in the 200 level, please see What rows in the 200 Level at Oakland Coliseum are covered?