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After an overwhelming re-election win, a series of high-profile bill signings and a fearless proclamation of New York as “the most progressive state in the nation,” Gov. Andrew M. Cuomo might have expected at least a brief honeymoon with his state’s voters.

It was not to be, according to a poll released Monday morning that showed Mr. Cuomo tallying the lowest approval ratings in his more than eight years in office.

In a survey of 778 registered voters, Siena College found that Mr. Cuomo has had a precipitous eight-point drop in his favorability rating, down to 43 percent from 51 percent last month. A full 50 percent of those polled had a unfavorable opinion of Mr. Cuomo, a Democrat, up seven points from last month.

And that may have been the good news: Mr. Cuomo’s job-performance rating was even worse, with just 35 percent of those surveyed saying he was doing a “excellent” or “good” job. Almost twice that — 64 percent — said Mr. Cuomo was doing a “fair” or “poor” job, another sharp rise from January.