| Basin: | SWI |
| Year: | 1970 |
| Track: | 1969-1970 South-West Indian Ocean cyclone season summary.png |
| First Storm Formed: | August 19, 1969 |
| Last Storm Dissipated: | April 1, 1970 |
| Strongest Storm Name: | Jane |
| Strongest Storm Winds: | 125 |
| Average Wind Speed: | 1 |
| Total Depressions: | 13 |
| Total Storms: | 13 |
| Total Hurricanes: | 6 |
| Fatalities: | 30 |
| Five Seasons: | 1967–68, 1968–69, 1969–70, 1970–71 1971–72 |
| Australian Season: | 1969–70 Australian region cyclone season |
| South Pacific Season: | 1969–70 South Pacific cyclone season |
| Total Intense: | 0 |
| Total Extreme: | 2 |
The 1969–70 South-West Indian Ocean cyclone season was an active cyclone season.
__TOC__
| Basin: | SWI |
| Track: | Aline 1969 track.png |
| Formed: | August 19 |
| Dissipated: | August 22 |
| 10-Min Winds: | 55 |
Aline existed from August 19 to August 22.
| Basin: | SWI |
| Track: | SWI Blanche 1969 track.png |
| Formed: | October 7 |
| Dissipated: | October 15 |
| 10-Min Winds: | 70 |
October 7 to October 15.
| Basin: | SWI |
| Track: | Corrine 1969 track.png |
| Formed: | November 11 |
| Dissipated: | November 21 |
| 10-Min Winds: | 45 |
26 deaths in Comoros and Mozambique.[1]
| Basin: | SWI |
| Track: | Delphine 1969 track.png |
| Formed: | December 29 |
| Dissipated: | January 1 |
| 10-Min Winds: | 35 |
Delphine existed from December 29 to January 1.
| Basin: | SWI |
| Track: | Diane-Francoise 1970 track.png |
| Formed: | January 10 (entered basin) |
| Dissipated: | January 16 |
| 10-Min Winds: | 70 |
This system entered the basin on January 7 and dissipated on January 17.
| Basin: | SWI |
| Track: | Eliane 1970 track.png |
| Formed: | January 7 |
| Dissipated: | January 11 |
| 10-Min Winds: | 35 |
The storm struck western Madagascar, bringing rainfall.[2]
| Basin: | SWI |
| Track: | Genevieve 1970 track.png |
| Formed: | January 10 |
| Dissipated: | January 19 |
| 10-Min Winds: | 65 |
Four deaths in Madagascar due to flooding.[3]
| Basin: | SWI |
| Track: | Hermine 1970 track.png |
| Formed: | January 22 |
| Dissipated: | January 27 |
| 10-Min Winds: | 65 |
One death on Reunion.[4]
| Basin: | SWI |
| Track: | Iseult 1970 track.png |
| Formed: | February 3 (entered basin) |
| Dissipated: | February 13 |
| 10-Min Winds: | 120 |
Iseult existed from February 2 to February 15.
| Basin: | SWI |
| Track: | Jane 1970 track.png |
| Formed: | February 11 (entered basin) |
| Dissipated: | February 28 |
| 10-Min Winds: | 125 |
It was named Josephine in its formative stages due to being in what was considered the Australian basin at the time.[5]
| Basin: | SWI |
| Track: | Katia 1970 track.png |
| Formed: | March 16 |
| Dissipated: | March 26 |
| 10-Min Winds: | 45 |
Katia existed from March 16 to March 26.
| Basin: | SWI |
| Track: | SWI Louise 1970 track.png |
| Formed: | March 20 |
| Dissipated: | April 1 |
| 10-Min Winds: | 85 |
Louise existed from March 20 to April 1.
| Basin: | SWI |
| Track: | Kathy-Michelle 1970 track.png |
| Formed: | March 26 (entered basin) |
| Dissipated: | March 30 |
| 10-Min Winds: | 75 |
Michelle entered the basin on March 24 and dissipated on March 30.