Check weather forecasts. Environment Canada gives you conditions on the hour and forecast for 7 days. Webcams give you their latest conditions including wind speed.
Environment Canada. Caribou, Nova Scotia ferry port.
http://weather.gc.ca/city/pages/ns-34_metric_e.htmlNS Webcams.
http://novascotia.ca/tran/cameras/ You want the two bracketing Rte 106 on the map.
Environment Canada. Eastern PEI.
http://weather.gc.ca/city/pages/pe-4_metric_e.htmlPEI webcams.
http://www.gov.pe.ca/tir/index.php3?number=1016836 You want Poole's Corner
Maybe you have ferry and bridge info, but in case not:
http://www.ferries.ca/northumberland-ferries-schedule-and-fares/Confederation Bridge:
http://www.confederationbridge.com/tolls-fees/tolls-fees.htmlToday's action: 34 Swimmers starting at NB end of bridge and doing the 13 km to PEI.
http://www.cbc.ca/news/canada/prince-edward-island/story/2013/08/02/ns-swim-northumberland-strait-charity.html:B