Is the Long Island Sound rough? What to expect on the crossing
Usually not by ocean standards, but choppy days happen. At the central Long Island Sound buoy the daily maximum wave height averages 1.00 m in January and 0.50 m in July, and NOAA's Coast Pilot says waves are restricted by limited fetch except to the east, though choppy conditions can create problems. The Bridgeport to Port Jefferson ferry sails in approximately 1 hour and 15 minutes.
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Sound · New York and Connecticut · Reputation among passengers: mixed: commonly reported as uncomfortable in the wrong conditions.
- Low
- Moderate
- High
- Very high
Roughness summarises typical reported conditions for this crossing, not a forecast for any given sailing.
Sheltered sound, long east-west fetch
In the Nausea Index table of the 121 sea crossings we cover, the Long Island Sound is rated manageable, one of 81 in that band, with 40 rated higher. Full table: the roughest sea crossings, ranked.
Key facts
- The Long Island Sound is a sound, and passenger reports place it in the moderate roughness band.
- The mechanism behind that reputation: Sheltered sound, long east-west fetch.
- Conditions are reported roughest in January, February, November and December.
- The calmest months are usually May, June, July, August and September.
Why does the Long Island Sound get rough?
Long Island Sound is a deep water sound with a generous fetch in an east-west direction, NOAA's Coast Pilot says, and a west wind can produce large seas in it. The Coast Pilot also says waves are restricted by limited fetch except to the east, and that choppy conditions can still create problems. Winter winds are mostly out of the west through north, and gales blow less than 5 percent of the time in these somewhat sheltered waters. At the central Long Island Sound buoy (44039), in 27 m of water, the daily maximum wave height averages 1.00 m in January and 0.50 m in July.
When is the Long Island Sound roughest?
NOAA's Coast Pilot says weather is most favorable from mid-May to mid-October, with thunderstorms and fog the most common hazards. In June, July and August there are on average 20 to 25 days per month with conditions generally considered ideal even for small boaters. Winter winds are mostly out of the west through north, and gales blow less than 5 percent of the time.
| Roughest water in Jan | Roughest water in Feb | Roughest water in Mar | Roughest water in Apr | Roughest water in May | Roughest water in Jun | Roughest water in Jul | Roughest water in Aug | Roughest water in Sep | Roughest water in Oct | Roughest water in Nov | Roughest water in Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Rough | Rough | Mixed | Mixed | Calm | Calm | Calm | Calm | Calm | Mixed | Rough | Rough |
Typical seasonal pattern, not a forecast. Any month can deliver a calm crossing or a bad one. Check the marine forecast for your sailing date. Select a month to see every sea and ferry crossing ranked for it.
Where to be on board
Front to back
- Bow (front)Avoid
- MidshipBest
- Stern (aft)OK
The crossing: 45 minutes to 1h20
Roughest stretch: The open middle of the crossing, away from both harbors
Stay low and near the middle of the boat. The crossings are short, so settle in before leaving the harbor.
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The crossings that cross it
| Route | Typical duration | What to know |
|---|---|---|
| Bridgeport, Connecticut to Port Jefferson, New York (Bridgeport & Port Jefferson Ferry) | About 1 hour 15 minutes | Car and passenger ferry across the sound, with peak and off-peak days on the operator's schedule. |
| New London, Connecticut to Orient Point, New York, auto ferry (Cross Sound Ferry) | About 1 hour 20 minutes | Crosses the eastern end of the sound, where it opens to Block Island Sound. |
| New London to Orient Point, high-speed ferry (Cross Sound Ferry) | About 45 minutes | Cross Sound Ferry's faster boats on the same crossing. |
What helps on this crossing
- Check the wind direction. NOAA's Coast Pilot says a west wind can produce large seas in the sound, and that choppy conditions can create problems even where fetch is limited.
- For a smoother ride, travel between mid-May and mid-October, when the Coast Pilot says weather is most favorable.
- Sit low and near the middle, watch the actual horizon line and put your phone away. The crossings take 45 minutes to 1 hour 20 minutes.
For the full toolkit see the seasickness guide, or what to do once it has already started. For what the trials actually say about the oldest trick on that list, see the verdict on looking at the horizon. If the rocking follows you ashore afterwards, that is land sickness, which is normal, and it passes.
Frequently asked questions
Is Long Island Sound rough in July?
Usually not. At the central Long Island Sound buoy the daily maximum wave height averages 0.50 m in July, and under 2 percent of July days top 1.0 m. The Coast Pilot says June, July and August average 20 to 25 days a month with conditions generally considered ideal even for small boaters, with thunderstorms and fog the main hazards.
Is Long Island Sound rough in January?
January is the roughest month at the buoy: the daily maximum wave height averages 1.00 m, and about 4 January days in 10 top 1.0 m. The Coast Pilot says winter winds are mostly out of the west through north and gales blow less than 5 percent of the time in these somewhat sheltered waters.
Is Long Island Sound rough in October?
It starts to build. About 3 October days in 10 top 1.0 m at the buoy, against fewer than 1 in 50 in July. The Coast Pilot says weather is most favorable only until mid-October.
How long are the Long Island Sound ferries?
Bridgeport to Port Jefferson takes approximately 1 hour and 15 minutes. Cross Sound Ferry gives approximately 1 hour and 20 minutes for its auto ferries between New London and Orient Point, and approximately 45 minutes on its high-speed ferries.
Other crossings
Sources & further reading
- https://nauticalcharts.noaa.gov/publications/coast-pilot/files/cp2/CPB2_C08_WEB.pdf
- https://nauticalcharts.noaa.gov/publications/coast-pilot/files/cp2/CPB2_C03_WEB.pdf
- https://www.88844ferry.com/schedule
- https://www.longislandferry.com/Common/faq.aspx
- https://www.ndbc.noaa.gov/station_page.php?station=44039
Sea conditions described here are typical patterns drawn from published marine and operator information as of July 2026, not a forecast: conditions on any given sailing depend on the weather that day, and any month can deliver a calm crossing or a bad one. Route and operator names are trademarks of their respective owners; Dizzout is not affiliated with or endorsed by them. Seasickness sensitivity varies from person to person; this page is informational and not medical advice.