This article encompasses the 1840–1849 Atlantic hurricane seasons. While data is not available for every storm that occurred, some parts of the coastline were populated enough to give data of hurricane occurrences. Each season was an ongoing event in the annual cycle of tropical cyclone formation in the Atlantic basin. Most tropical cyclone formation occurs between June 1 and November 30.

1840 Atlantic hurricane season Tropical Storm One June 19–23.Reassessment of Historical Atlantic Basin Tropical Cyclone Activity 1700-1855 (2006), M Chenoweth, Final Storm #331 In the middle of June, a tropical storm passed west of Lake Charles, Louisiana, accompanied by several days of heavy rain. Strong winds on June 21 damaged corn crops.

Tropical Storm Two September 17–18 Reassessment of Historical Atlantic Basin Tropical Cyclone Activity 1700-1855 (2006), M Chenoweth, Final Storm #332 A tropical storm struck Galveston, Texas.

Tropical Storm Three On an unspecified date in 1840, a hurricane reportedly caused severe flooding that destroyed entire villages at the mouth of the Rio Grande. Unclear whether these events are related to prior storm that struck Galveston.Chenoweth, p. 64

1841 Atlantic hurricane season Tropical Storm One August 23–24.Reassessment of Historical Atlantic Basin Tropical Cyclone Activity 1700-1855 (2006), M Chenoweth, Final Storm #333 A tropical storm was reported off the southern U.S. Atlantic coast.

Hurricane Two The Late Gale at St. Joseph. September 7–16.Reassessment of Historical Atlantic Basin Tropical Cyclone Activity 1700-1855 (2006), M Chenoweth, Final Storm #334 A strong tropical storm hit Barbados in early September, then traveled to the Florida Panhandle on September 14 and 15, and continued on to South Carolina.

Hurricane Three September 25–27.Reassessment of Historical Atlantic Basin Tropical Cyclone Activity 1700-1855 (2006), M Chenoweth, Final Storm #335 A hurricane was reported off the Cape Hatteras coast that later traveled to Nova Scotia.

Hurricane Four The October Gale of 1841. September 25-October 4.Reassessment of Historical Atlantic Basin Tropical Cyclone Activity 1700-1855 (2006), M Chenoweth, Final Storm #336 The hurricane was first reported near Barbados and later became an intense hurricane that remained offshore of the Carolinas in early October. It moved northeastward, entraining cold air into its circulation. It became an extratropical storm, and hit New England on October 3. It led to a storm of snow and sleet in Connecticut, bringing drifts of up to of snow in some areas. The storm wrecked the Georges Bank fishing fleet which drowned 81 fishermen and knocked down trees, tore roofs off houses and forced boats to go up on shore. The storm also destroyed a saltworks factory along Cape Cod, sending the economy to a slump. In 1842, a monument was erected to remember the sailors and fishermen lost at sea to the "October Gale" of 1841.

Hurricane Five The Key West Hurricane of 1841. October 18–21.Reassessment of Historical Atlantic Basin Tropical Cyclone Activity 1700-1855 (2006), M Chenoweth, Final Storm #337 In October, a hurricane hit Cuba, crossing near Havana. After crossing the island, it passed by the Florida Keys on October 18 and 19. The hurricane eroded part of Key West, destroyed the keeper's house at Sand Key Light, and damaged the seawall and later headed towards Bermuda. Wrecked many ships in Lower Keys.

1842 Atlantic hurricane season

The 1842 Atlantic hurricane season featured several maritime catastrophes in the Gulf of Mexico and along the U.S. East Coast, and produced one of the only known tropical cyclones to directly affect the Iberian Peninsula. As the season falls outside the scope of the Atlantic hurricane database, records of most storms in 1842 are scarce, and only approximate tracks are known.

Hurricane One The First North Carolina Hurricane of 1842. July 10–14.Reassessment of Historical Atlantic Basin Tropical Cyclone Activity 1700-1855 (2006), M Chenoweth, Final Storm #338 A major hurricane hit near Portsmouth, North Carolina, near Ocracoke on July 12. Two ships were capsized, killing their entire crews. It continued across Virginia, dissipating over Maryland. A second hurricane hit the same area in North Carolina just six weeks later.

Tropical Storm Two July 31-August 2.Reassessment of Historical Atlantic Basin Tropical Cyclone Activity 1700-1855 (2006), M Chenoweth, Final Storm #339 A tropical storm affected Northeastern Florida near Cedar Keys on August 2 and continued on to Jacksonville.

Hurricane Three The Second North Carolina Hurricane of 1842. August 24. A second North Carolina hurricane hit Ocracoke, North Carolina, on August 24, drowning livestock and washing away homes. In addition, it sank three ships, causing at least 8 deaths.

Hurricane Four Antje's / Florida Keys Hurricane. August 24-September 8.Reassessment of Historical Atlantic Basin Tropical Cyclone Activity 1700-1855 (2006), M Chenoweth, Final Storm #340 A westward moving hurricane originating near the Leeward Islands, nicknamed Antje's hurricane after a schooner of the same name that was dismasted by the storm. The cyclone moved across the Florida Keys on September 4. Damaged Sand Key lighthouse. It continued westward across the Gulf of Mexico, landing between Matamoros and Tampico, Mexico. Its unusual westward movement, also seen by a hurricane in 1932 and Hurricane Anita in 1977, was due to a strong high pressure system to its north.

Hurricane Five The Galveston Hurricane of 1842. September 9–30.Reassessment of Historical Atlantic Basin Tropical Cyclone Activity 1700-1855 (2006), M Chenoweth, Final Storm #341 A strong tropical storm started near Tobago and traveled into the Gulf of Mexico and hit Galveston on September 17. It caused $10,000 in damage, and killed 40 cattle.

Tropical Storm Six September 22-23. The Florida Panhandle experienced the effects of a tropical storm, marked by gale-force winds at Pensacola on September 22 and 23. No appreciable damage was reported. Ludlum considered that this may have been a continuation of the Galveston storm, but judged it to be a separate system.

Hurricane Seven The Gulf to Bermuda Hurricane of 1842. September 30-October 9.Reassessment of Historical Atlantic Basin Tropical Cyclone Activity 1700-1855 (2006), M Chenoweth, Final Storm #342 A hurricane passed by Galveston on October 5, causing flooding and the sinking of one ship. It continued eastward, becoming a major hurricane before hitting near St. Marks, Florida. It caused $500,000 in damage before moving out to sea near Bermuda on the 10th. A 20-foot storm surge was reported at Cedar Key, Florida.

Hurricane Eight October 24-October 27.Reassessment of Historical Atlantic Basin Tropical Cyclone Activity 1700-1855 (2006), M Chenoweth, Final Storm #343 A cyclone, first detected southwest of Madeira on October 24, passed the island on October 26, moving northeast towards the Iberian Peninsula. It struck southern Spain on October 29, and moved inland as far as Madrid. It peaked at as a Category 2 hurricane near Madeira on October 26. The storm can be considered a historical precedent for Hurricane Vince of the 2005 Atlantic hurricane season.

Tropical Storm Nine October 24-November 1.Reassessment of Historical Atlantic Basin Tropical Cyclone Activity 1700-1855 (2006), M Chenoweth, Final Storm #344 This cyclone was first detected east of Miami on October 26. It paralleled the coastlines of Florida, Georgia, and South Carolina before dissipating on the 30th south of North Carolina.

1843 Atlantic hurricane season Tropical Storm One July 11–14.Reassessment of Historical Atlantic Basin Tropical Cyclone Activity 1700-1855 (2006), M Chenoweth, Final Storm #345 A Tropical storm hit near Jamaica then traveled near the Florida Keys.

Hurricane Two August 15–20. September 30-October 9.Reassessment of Historical Atlantic Basin Tropical Cyclone Activity 1700-1855 (2006), M Chenoweth, Final Storm #346 Hurricane originated north of the Leeward Islands and traveled northward out to sea near Nova Scotia.

Hurricane Three The Port Leon Florida Hurricane of 1843. September 13–15. September 30-October 9.Reassessment of Historical Atlantic Basin Tropical Cyclone Activity 1700-1855 (2006), M Chenoweth, Final Storm #347 A major hurricane moved northward through the Gulf of Mexico. It hit Port Leon, Florida, on September 13, destroying the town from the flooding and storm surge. Fourteen people were killed. The town residents moved the town three miles (5 km) northward to New Port, now called Newport, Florida. The storm continued on up to Maryland.

1844 Atlantic hurricane season Tropical Storm One June 11-June 15. A tropical storm hit near Lake Charles, Louisiana, on June 11. It moved slowly northward to the west of the town, dissipating on the 15th.

Hurricane Two The Matamoros Hurricane of 1844 August 4–5.Reassessment of Historical Atlantic Basin Tropical Cyclone Activity 1700-1855 (2006), M Chenoweth, Final Storm #348 A major hurricane moving through the Gulf of Mexico hit the Rio Grande valley on August 4. It slowly moved through the area, causing 70 deaths. It did not leave a house standing at the mouth of the river or the Brazos Santiago on the north end of the barrier island. The Mexican customs house was removed after this storm to the mainland.

Hurricane Three September 8–16.Reassessment of Historical Atlantic Basin Tropical Cyclone Activity 1700-1855 (2006), M Chenoweth, Final Storm #349 On September 8, a hurricane moved into Florida south of St. Augustine. It moved across the state, emerging into the Gulf of Mexico before turning northeastward and hitting Florida again on the 9th. This hurricane destroyed most of what was left of the deserted town of St. Joseph, Gulf County, Florida.

Tropical Storm Four September 25-October 2.Reassessment of Historical Atlantic Basin Tropical Cyclone Activity 1700-1855 (2006), M Chenoweth, Final Storm #350 Storm originated near the southern Leeward Islands and headed past Jamaica to Key West.

Hurricane Five The Cuban Hurricane of 1844 September 30-October 7.Reassessment of Historical Atlantic Basin Tropical Cyclone Activity 1700-1855 (2006), M Chenoweth, Final Storm #351 A hurricane originating near Barbados hit Cuba on October 4, causing 101 deaths. It moved northeastward, bringing rain and strong winds to the United States coastline but remaining offshore. The schooner revenue cutter Vigilant, USRC Vigilant, was lost off Key West during this hurricane on the 4th and 5th. Many of the structures built by the Navy on Indian Key and all wharves were washed away.Maritime Business Strategies, LLC. William H. Webb. Retrieved on 2007-02-18.

1845 Atlantic hurricane season Hurricane One October 27–29.Reassessment of Historical Atlantic Basin Tropical Cyclone Activity 1700-1855 (2006), M Chenoweth, Final Storm #352 Hurricane reported near Bermuda out in the Atlantic Ocean.

1846 Atlantic hurricane season Hurricane One

The Hatteras Inlets Hurricane of 1846. September 5–11.Reassessment of Historical Atlantic Basin Tropical Cyclone Activity 1700-1855 (2006), M Chenoweth, Final Storm #353 A slow-moving hurricane remained offshore of Cape Hatteras on September 6. It pushed water into the Pamlico Sound. When the hurricane moved far enough north, the northerly winds pushed the water back out, creating two major inlets on the Outer Banks, the Hatteras Inlet and the Oregon Inlet. The latter bearing the name of the first large ship that passed through it.

Hurricane Two