New York · Seneca / Ontario / Yates / Schuyler County
Seneca Lake
Geneva · Watkins Glen · Penn Yan
Loading live conditions for Seneca Lake…
Make a day of it
Plan your visit to Seneca Lake
Things to doTours & activities on Seneca Lake
Boat cruises, fishing trips, kayak rentals, and guided adventures from local operators.
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Places to stayLake houses & rentals
Vacation rentals right on the water.
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"The largest of New York's Finger Lakes — 38 miles long and 618ft deep, lined with wineries and small towns. Watkins Glen at the south end anchors the famous gorge state park and racing track. Massive thermal capacity means it stays ice-free most winters."
Seasonal pattern
When does Seneca Lake warm up?
Seneca Lake is deep (max depth 618ft) and carries significant thermal inertia, so it warms slowly — surface temperatures typically don't reach comfortable swimming range until late June or early July. Spring-fed or alpine lakes stay cooler all summer. The live forecast above shows current conditions.
Field notes
About Seneca Lake
- Deepest Finger Lake (618ft) — one of the deepest US lakes east of Mississippi
- Surrounded by 60+ wineries on the Seneca Lake Wine Trail
- Live USGS sensor at Seneca Lake Platform (when reporting)
- Famous for "Seneca guns" — atmospheric booms scientists still debate
- Surface area
- 43,342 acres
- Max depth
- 618 ft
- County
- Seneca / Ontario / Yates / Schuyler
- Water data
- Live USGS sensor
- USGS site
- 425027076564401