The 1966 Pacific hurricane season started on May 15, 1966, and ended November 30, 1966. The season was of little note. Hurricane Blanca traveled 4,300 miles, setting a new record. During September and October of the year, Hurricane Helga and Tropical Storms Kirsten, Lorraine, and Maggie hitting Mexico. Kirsten caused 8 deaths and US$5.6 million in damages in Mexico.

The 1970 Pacific hurricane season was an active Northern hemisphere hurricane season, especially during its early months. It officially started on May 15, 1970, in the eastern Pacific Ocean, and on June 1, 1970 in the central Pacific. It ended on November 30, 1970 in both regions. These dates conventionally delimit the period of each year when most tropical cyclogenesis occurs in these parts of the Pacific.