The first storm of the season, Hurricane Adolph, became the southernmost-forming east Pacific tropical cyclone on record after forming at a latitude of 7.1°N.

After a slow start, activity picked up in July, when Hurricane Gil moved through the Hawaiian Islands, resulting in minor damage.

Although most of its impact occurred in Mexico, Tico's remnants brought significant flooding in the Central United States, resulting in six deaths and $42 million in damage.

[3] At 1800 UTC on June 12, Barbara was estimated to have attained hurricane status while centered 175 mi (280 km) north of Clipperton Island.

The system gradually intensified over waters as warm as 86 °F (30 °C) and at 0000 UTC on July 13, the agency upgraded the low into a tropical storm.

Early on August 5, the system was downgraded into a tropical depression and degenerated into a trough about 300 mi (485 km) west-northwest of Tern Island later that day.

The storm dissipated the next day at a high latitude, though the remnants of Henriette brought cloud cover to Oregon and Washington.

Moving toward a strong trough off the west coast of the peninsula, Juliette reached its peak intensity as a mid-level tropical storm early on August 29, with winds of 60 mph (95 km/h).

[7] Initially expected to turn west and head out to sea,[17] the storm moved northwest while paralleling the Mexican coast.

[3] Shortly after its peak, a combination of cooler waters and increased wind shear associated with the subtropical jetstream[7] resulted in rapid weakening.

[3] The outer rainbands of Hurricane Kiko caused considerable damage to homes and hotels situated near the coast of Mexico, forcing the evacuation of hundreds.

[38] While at sea, Hurricane Kiko was responsible for 12 ft (3.7 m) waves along Newport Beach, California, resulting in more than 100 lifeguard rescues.

A disturbance moved westward and was classified as a tropical depression about 90 mi (145 km) south of Acapulco early on September 6.

[7] Very early on September 9, the EPHC downgraded Lorena weakened into a Category 1 hurricane;[3] the storm was expected to emerge into the southern Gulf of California in about 48 hours and thereafter meander.

After briefly weakening back to a Category 1 hurricane,[3] Lorena moved west-northwest and into a low wind shear environment.

[7] Subsequently, Lorena attained its secondary peak with winds of 105 mph (170 km/h) while passing about 150 mi (240 km) south of Cabo San Lucas.

[3] Later that day, Lorena weakened into a tropical storm due to a combination of strong shear and cold sea surface temperatures.

[45] A total 3,000 customers lost electricity in Porterville because of high winds, heavy rains, which led to minor damage.

[50] Several hours after Manuel dissipated on September 20, a tropical disturbance formed 200 mi (320 km) south of Socorro Island.

It quickly intensified and early on September 29, a Hurricane Hunter aircraft reported winds of 70 mph (110 km/h) and the formation of an eye.

[83] While still a Category 2 hurricane, the outer rainbands of Priscilla brought rains to California, resulting in power outages, hail, and traffic accidents.

[7] Despite the presence of strong wind shear, it was upgraded to a tropical depression 764 mi (1,230 km) south-southeast of Cabo San Lucas on October 8.

[3] With continued warm waters, the system crossed into the CPHC warning zone,[7] reaching a secondary peak of 140 mph (230 km/h) on October 14 while becoming one of the strongest storms ever recorded in the region.

[86] Because meteorologists were predicting that the storm may pose a threat to the Hawaiian island group, the CPHC issued a hurricane watch for Hawaii.

There was one fatality when a sailor, Richard Sharp, was killed overboard off the 44-foot (13 m) yacht Hazaña; the boat, which was dismasted, was also occupied by his girlfriend, Tami Oldham Ashcraft, from Tahiti to San Diego, but the course was altered to Hawaii because of the storm.

However, outflow from Hurricane Raymond weakened the system and Sonia dissipated on October 14 over 1,000 miles (1,610 km) south-southeast of the Big Island.

Over warm waters, the system was sufficiently organized to be declared Tropical Depression Twenty-One on October 11, about 575 mi (925 km) south of Acapulco.

Throughout the state of Sinaloa, the hurricane destroyed nearly 19,000 acres (77 km2) of bean and corn, although most of the agricultural damage occurred south of Mazatlán.

[7] Due to a combination of unusually warm sea surface temperatures and the displacement of the ITCZ to north, a small area of disturbed weather formed in early December.

Due to wind shear caused by a trough, Winnie began to rapidly deteriorate, and it was downgraded into a tropical storm that night.