Is Lake Ontario (Lake America) Safe to Swim Today?
Check the live status for your specific beach above; New York State's beach advisory feed can mark an individual beach open, under advisory, or closed on any given day, for reasons ranging from bacteria sample results to weather.
This site does not summarize general swim safety guidance (rip currents, algae advisories) itself. Go directly to NY DEC and NY State Parks for that; their own pages are the authority.
Source: NY State beach advisory feed (beachadvisory.health.ny.gov), per research/beaches.json