Seasonal Forecasts
| Source | Date | Total TCs |
Tropical storms |
Typhoons |
| TSR | – | 27 | 17 | |
| GCACIC | Average (1950–2000) | 31 | 27 | 17 |
| TSR | March 16, 2009 | – | 26 | 16 |
| GCACIC | April 20, 2009 | 31 | 27 | 18 |
| TSR | May 7, 2009 | – | 28 | 18 |
| GCACIC | June 18, 2009 | 30 | 27 | 18 |
| CWB | June 30, 2009 | – | 24–27 | – |
| TSR | July 6, 2009 | – | 28 | 18 |
| TSR | August 4, 2009 | – | 28 | 18 |
| JMA | Actual activity | 39 | 22 | 13 |
| JTWC | Actual activity | 28 | 24 | 15 |
Each season several national meteorological services and scientific agencies forecast either the expected amount tropical cyclones, tropical storms, and typhoons forming in a season and/or how many tropical cyclones will affect a country or territory.
Read more about this topic: 2009 Pacific Typhoon Season