Hurricane Juan was a significant tropical cyclone which caused extensive damage to parts of Atlantic Canada, being the tenth named storm and the sixth hurricane of the 2003 Atlantic hurricane season. Juan formed southeast of Bermuda on September 24 from a tropical wave that had tracked across the subtropical Atlantic Ocean. It tracked northward and strengthened over the warm waters of the Gulf Stream, reaching Category 2 strength on the Saffir-Simpson hurricane scale on September 27. The hurricane peaked in intensity with sustained winds of 105 mph (169 km/h) that same day, losing some strength as it raced over cooler waters toward the coast of Nova Scotia, before making landfall between Shad Bay and Prospect in the Halifax Regional Municipality early on September 29 as a Category 2 hurricane with winds of 100 mph (160 km/h). Juan retained hurricane strength while travelling through Nova Scotia, though it would weaken into a Category 1 hurricane over Prince Edward Island. Juan would eventually be absorbed by another extratropical low on September 29 near Anticosti Island in the northern Gulf of Saint Lawrence.

The 2003 Atlantic hurricane season was a very active season with tropical cyclogenesis occurring before and after the official bounds of the season—the first such occurrence since the 1970 season. The season produced 21 tropical cyclones, of which 16 developed into named storms; seven of those attained hurricane status, of which three reached major hurricane status. The strongest hurricane of the season was Hurricane Isabel, which reached Category 5 status on the Saffir–Simpson hurricane scale northeast of the Lesser Antilles; Isabel later struck North Carolina as a Category 2 hurricane, causing $3.6 billion in damage and a total of 51 deaths across the Mid-Atlantic region of the United States.