Breachway tides lag approximately 3 hours behind Newport tides. Outgoing tides at Breachway Mouth can pose challenging sea conditions when larger sea swells are present.
Helpful Links:
Swellinfo.com
Here is a great model—the green and blue indicates clean offshore conditions at the Breachway, red indicates onshore breezes bringing choppier conditions at Breachway mouth.
NOAA
NOAA-National Weather Service- NWS Marine Forecast
Ocean Mist Surf Cam
This is a live, user controlled video camera located in Matuneck RI. This should show similar sea conditions to the current sea state of the Charlestown Breachway