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The 1939 Atlantic hurricane season was the least active since 1930. The season had below normal activity, with only six tropical storms, of which three became hurricanes and one became a major hurricane, equivalent to Category 3 status or higher on the modern-day Saffir–Simpson scale. far below the 1931–1943 average of 91.2. ACE is a metric used to express the energy used by a tropical cyclone during its lifetime. Therefore, a storm with a longer duration will have high values of ACE. It is only calculated at six-hour increments in which specific tropical and subtropical systems are either at or above sustained wind speeds of 39 mph (63 km/h), which is the threshold for tropical storm intensity. Thus, tropical depressions are not included here. Reports of the storm first came from the Mexican Weather Service office in Chetumal, Quintana Roo, and during the afternoon of June 12, vessels just offshore recorded squally conditions and choppy seas. The cyclone moved northward, parallel to the coast of Belize, before moving over the northeastern corner of the Yucatán Peninsula. It continued steadily northward through the Gulf of Mexico, slowly strengthening to a peak of 50 mph (85 km/h) on June 14 with a minimum central pressure of . Damage associated with the cyclone was generally minor, and only one life was lost when a boy fell into the swollen waters of a river and drowned. After weakening to a tropical storm, it quickly re-strengthened upon emerging into the Gulf of Mexico, and made another landfall near Apalachicola, Florida, on August 13. Over land, the cyclone slowed considerably and quickly deteriorated. Torrential rain fell in Alabama as a result of the storm's slow forward movement, leading to severe flooding. Further inland, the storm spawned a tornado in North Carolina which caused one death. As the depression continued heading inland, it dropped heavy precipitation throughout the Mid-Atlantic States, exceeding in Tuckerton, New Jersey,
Tropical Storm Three
An operationally unnoticed tropical storm developed on August 15. At its peak, sustained winds were 65 mph (100 km/h) and the minimum pressure of . By August 19, the storm dissipated.
Tropical Storm Four
An area of disturbed weather over Central America organized into a tropical storm in the Bay of Campeche on September 23. Uneventfully, it moved generally north-northeastward through the Gulf of Mexico and its winds strengthened to a peak of 50 mph (85 km/h). The storm made landfall on south-central Louisiana on September 26, and dissipated later that day. The Weather Bureau office in New Orleans posted numerous advisories, although the effects from the storm were minimal. Damage was fairly significant; the winds uprooted trees, shattered windows, and disrupted public utilities. In Newfoundland, the remnants of the storm destroyed a house in St. John's and caused minor flooding in other areas of the province. Six people drowned offshore Newfoundland.
Hurricane Six
On October 29, the sixth and final known tropical cyclone of the season developed in the western Caribbean Sea from a tropical wave. It initially moved northwestward, but turned toward the east shortly thereafter. Drifting due eastward, the storm grew into a minimal hurricane on October 31 while passing over the Cayman Islands. The hurricane's center passed just north of the island of Jamaica later that day as it weakened back into a tropical storm. Eventually, the storm turned abruptly northeastward and crossed the eastern tip of Cuba. By November 3, it had emerged into the Atlantic and entered the southern Bahamas. Beginning to accelerate, the tropical storm passed to the west of Bermuda before becoming extratropical on November 6.