Mid-career
In 1989 Weiss' offensive numbers didn't improve as he battled through injury and adversity even though the A's repeated as AL pennant winners, meeting their crosstown rival San Francisco Giants in the 1989 World Series. Although the Series would be overshadowed by the Loma Prieta earthquake on October 17 which delayed play for ten days, Weiss homered and the A's swept the Giants to claim their first world title in fifteen years.
1990 saw Weiss put up his best offensive numbers to date in hits, runs and batting average, while also stealing nine bases. The A's won their third straight pennant, but Weiss was injured in the 1990 American League Championship Series against the Boston Red Sox and missed Oakland's 1990 World Series loss to the Cincinnati Reds, four games to none.
Limited by prior injuries, he didn't play much in 1991 as the A's missed the playoffs for the first time since 1987. In what would be his final year in Oakland, he hit an anemic .212 in 1992 and was traded to the new NL expansion Florida Marlins during the offseason.
He played in 158 games in 1993 for the Marlins, but after the season became a free agent, chose to sign with the Colorado Rockies (which like the Marlins were a new NL expansion team in 1993) and was the first player to play for both of these 1993 expansion teams. Weiss spent four modestly successful years with the bat in Colorado, posting career highs in home runs (8) and RBIs (48); but his strengths lay in solid defensive play at shortstop and ability to reach base (.351 lifetime OBP).
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