Gavin Newsom did in fact face a statewide recall election in California in 2021. The official election date was September 14, 2021, as confirmed by the California Secretary of State and contemporaneous election notices. (sos.ca.gov)

Sacks’s timing was slightly off—he said the recall would be “around August,” while the election was ultimately set for mid‑September. However, key election activity (such as mailing vote‑by‑mail ballots) began on August 16, 2021, which is indeed in August and part of the same late‑summer window he was pointing to. (sos.ca.gov)

Because:

• A recall election did occur, as predicted, and
• Its timing (mid‑September with election processes starting in mid‑August) reasonably matches “around August,”

the prediction is best classified as right, with a minor timing inaccuracy rather than a substantive failure.