Jon Weeks is listed at LS on the San Francisco 49ers roster checked September 20, 2026. The official source lists the roster status as Active roster (ACT).
The details below are dated roster facts. Roster status, practice participation, and game-day availability are different; this profile does not turn one into another.
Selected report: San Francisco 49ers · Active roster · Season 2026
| Observation window | Record date | Team | Roster status | Effective date | Record |
|---|---|---|---|---|---|
| Season 2026 · Week 5 | Oct 11, 2026, 10:00 am EDT Updated | San Francisco 49ers | Active roster | Not supplied | Weekly roster |
| Season 2026 · Week 4 | Oct 11, 2026, 10:00 am EDT Updated | San Francisco 49ers | Active roster | Not supplied | Weekly roster |
| Season 2026 · Week 3 | Oct 11, 2026, 10:00 am EDT Updated | San Francisco 49ers | Active roster | Not supplied | Weekly roster |
| Season 2026 · Week 2 | Oct 11, 2026, 10:00 am EDT Updated | San Francisco 49ers | Active roster | Not supplied | Weekly roster |
| Season 2026 · Week 1 | Oct 11, 2026, 10:00 am EDT Updated | San Francisco 49ers | Active roster | Not supplied | Weekly roster |
| Dated observation | Sep 20, 2026, 7:00 am EDT Observed | San Francisco 49ers | Active roster | Not supplied | Dated roster |
Weekly rows describe the supplied week, not a dated transaction. Observed dates show when a record was checked, not when a contract or roster move took effect. Conflicting records remain separate. Only retained observations are shown; game-day status belongs to the availability report.
San Francisco won a seven-turnover game in Seattle when Cooper Kupp was ruled a yard short on the Seahawks' last chance, and Gracen Halton scored on a fumble in the end zone.
The 49ers linebacker was sent off midway through the second quarter after a sideline scrum, and San Francisco still took a 21-13 lead into halftime.
Mykel Williams makes his season debut for unbeaten San Francisco, Nick Bosa misses a third game, and Arizona keeps Harrison out while his trade is completed.
