1870 Atlantic hurricane season
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| Season summary map | |
| First storm formed | July 30, 1870 |
|---|---|
| Last storm dissipated | November 3, 1870 |
| Strongest storm | Hurricane Four – – 948 mbar (hPa) (28.01 inHg), 125 mph (205 km/h) |
| Total storms | 11 |
| Hurricanes | 10 |
| Major hurricanes (Cat. 3+) | 2 |
| Total fatalities | Unknown |
| Total damage | Unknown |
| Atlantic hurricane seasons 1868, 1869, 1870, 1871, 1872 | |
The 1870 Atlantic hurricane season was a hurricane season in the Atlantic Ocean. Because of a lack of information, many storm tracks appear short and incomplete.
Storms
Hurricane One
| Category 1 hurricane | |
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| Duration | July 30 – July 30 |
|---|---|
| Peak intensity | 80 mph (130 km/h) (1-min) |
This hurricane is known to have impacted the Mobile, Alabama, area on July 30.
Hurricane Two
| Category 2 hurricane | |
 | |
| Duration | August 30 – September 4 |
|---|---|
| Peak intensity | 105 mph (165 km/h) (1-min) |
This hurricane is known to have lasted from August 30 to September 4.
Tropical Storm Three
| Tropical storm | |
 | |
| Duration | September 1 – September 4 |
|---|---|
| Peak intensity | 70 mph (110 km/h) (1-min) 1004 mbar (hPa) |
This tropical storm is known to have lasted from September 1 to September 4.
Hurricane Four
| Category 3 hurricane | |
 | |
| Duration | September 9 – September 13 |
|---|---|
| Peak intensity | 125 mph (205 km/h) (1-min) 948 mbar (hPa) |
This hurricane is known to have lasted from September 9 to September 13. At its strongest, the storm was a Category 3 hurricane with winds of 125 mph (205 km/h), making it the strongest of the season.
Hurricane Five
| Category 1 hurricane | |
 | |
| Duration | September 17 – September 20 |
|---|---|
| Peak intensity | 90 mph (150 km/h) (1-min) 969 mbar (hPa) |
This hurricane is known to have lasted from September 17 to September 20.
Hurricane Six
| Category 3 hurricane | |
 | |
| Duration | October 5 – October 14 |
|---|---|
| Peak intensity | 115 mph (185 km/h) (1-min) 959 mbar (hPa) |
On October 5, a tropical storm formed south of Haiti. It moved west-northwest, becoming a hurricane south of Cuba on the 6th. The hurricane strengthened fast to its top winds of 115 mph before hitting Matanzas, Cuba on the 7th. After crossing the island, it moved slowly over the Florida Keys and then out to sea, last being seen on the 14th. The hurricane, known as the Hurricane of San Marcos or the Straits of Florida Hurricane, caused lots of flooding in Cuba and south Florida, resulting in 800 or more deaths.
Hurricane Seven
| Category 1 hurricane | |
 | |
| Duration | October 7 – October 7 |
|---|---|
| Peak intensity | 80 mph (130 km/h) (1-min) |
This hurricane is known to have existed on October 7.
Hurricane Eight
| Category 1 hurricane | |
 | |
| Duration | October 10 – October 11 |
|---|---|
| Peak intensity | 80 mph (130 km/h) (1-min) |
This hurricane is known to have existed on October 10 and October 11.
Hurricane Nine
| Category 2 hurricane | |
 | |
| Duration | October 19 – October 22 |
|---|---|
| Peak intensity | 105 mph (165 km/h) (1-min) |
This hurricane is known to have lasted from October 19 to October 22. It struck Cuba as a Category 2 hurricane and then Florida on October 20 as a Category 1 hurricane. The storm caused 52 deaths.
Hurricane Ten
| Category 2 hurricane | |
 | |
| Duration | October 23 – October 23 |
|---|---|
| Peak intensity | 105 mph (165 km/h) (1-min) |
This hurricane is known to have existed near the Turks and Caicos Islands on October 23.
Hurricane Eleven
| Category 1 hurricane | |
 | |
| Duration | October 30 – November 3 |
|---|---|
| Peak intensity | 80 mph (130 km/h) (1-min) |
The final storm of the season is known to have existed from October 30 to November 3 and struck the Yucatán Peninsula of Mexico on November 1.