In late September, Hurricanes Rosa and Sergio formed, both of which eventually brought thunderstorms and flash flooding to the Baja California Peninsula and the Southwestern United States.

Aletta peaked as a Category 4 hurricane with maximum sustained winds of 140 mph (220 km/h) and a minimum central pressure of 943 mbar (27.85 inHg) at 12:00 UTC on June 8, while located about 575 mi (925 km) south-southwest of Manzanillo.

A low-pressure area formed the next day and continued to increase in organization, spawning a tropical depression at 18:00 UTC on June 9, about 330 mi (530 km) south of Acapulco, Mexico.

The cyclone ultimately peaked as a Category 4 hurricane with winds of 140 mph (220 km/h) and a pressure of 943 mbar (27.85 inHg) around 00:00 UTC on June 12, while located approximately 200 mi (320 km) southwest of Manzanillo, Mexico.

The disturbance improved in organization over the next couple of days, forming a tropical depression on June 24 at 00:00 UTC, approximately 725 mi (1,167 km) south-southwest of the southern tip of the Baja California peninsula.

The convection of the storm completely dissipated, resulting in it becoming a remnant low around 06:00 UTC on June 26, while about 615 mi (990 km) west-southwest of the southern tip of the Baja California peninsula.

The system continued to organize over the next couple of days as it moved north of west, developing into a tropical depression on June 27 at 18:00 UTC, while about 470 mi (755 km) southwest of Manzanillo, Mexico.

Located within a favorable environment of warm sea surface temperatures, moist air, and low wind shear, Fabio continued to consolidate over the next couple of days.

The storm peaked at 18:00 UTC on the next day as a high-end Category 2 hurricane with winds of 110 mph (175 km/h) and a pressure of 964 mbar (28.47 inHg), while located 645 mi (1,038 km) southwest of the southern tip of the Baja California peninsula.

Gilma reached its peak intensity of 45 mph (75 km/h) winds and a pressure of 1,005 mbar (29.68 inHg) at 06:00 UTC on July 27, while located 1,210 mi (1,950 km) west-southwest of the southern tip of the Baja California peninsula.

During this time, lower sea surface temperatures and ocean heat content as well as mid-level dry air caused Hector to gradually weaken into a low-end Category 3 storm.

Despite its close proximity to the larger disturbance which later became Hurricane John, the system rapidly organized into a tropical depression by 18:00 UTC, 230 mi (370 km) south-southeast of Puerto Ángel, Mexico.

Ileana reached its peak intensity at 12:00 UTC on August 6 with winds of 65 miles per hour (105 km/h) and a pressure of 998 mbar (29.47 inHg), while located 115 mi (185 km) southwest of Acapulco.

A period of rapid intensification ensued as a result of John being located in a favorable environment of low wind shear, warm sea surface temperatures, and a high quantity of mid-level moisture.

Convection quickly dissipated near the center of the cyclone, causing it to be downgraded to a post-tropical system by 12:00 UTC on August 10, approximately 345 mi (555 km) west-southwest of Punta Eugenia, Mexico.

[86] Soon after, a period of rapid intensification commenced as Lane entered a favorable environment of warm sea surface temperatures, low wind shear, and moist air.

The cyclone began to weaken after entering the Central Pacific due to moderate southwesterly wind shear imparted by an upper-level trough located near the Hawaiian Islands.

The cyclone moved around the western edge of a mid-level ridge, shifting its track northward; at its closest point to the state of Hawaii, Lane was about 150 mi (240 km) away from most islands.

[98] Embedded within a favorable environment of moist air, low wind shear, and 82 °F (28 °C) sea surface temperatures, Miriam strengthened to 65 miles per hour (105 km/h) by 12:00 UTC on August 27, while located 1,485 mi (2,390 km) west-southwest of the southern tip of the Baja California peninsula.

Located within a favorable environment of moist air, low wind shear, and 84–86 °F (29–30 °C) sea surface temperatures, Norman began a two-day period of rapid intensification around 18:00 UTC on August 28.

It reached its peak intensity on August 30 at 18:00 UTC as a Category 4 hurricane with winds of 150 miles per hour (240 km/h) and a pressure of 937 mbar (27.67 inHg), while 520 mi (835 km) southwest of the southern tip of the Baja California peninsula.

Olivia turned towards the west and began a period of rapid intensification, reaching hurricane intensity on September 4 at 00:00 UTC, while located 575 mi (925 km) southwest of Cabo San Lucas.

Olivia peaked at 00:00 UTC on September 7 as a Category 4 hurricane with winds of 130 miles per hour (210 km/h) and a pressure of 951 mbar (28.08 inHg), while over 1,265 mi (2,036 km) west of Cabo San Lucas.

The depression's convection dispersed later in the day, resulting in the system being downgraded to a remnant low around 00:00 UTC on September 12 while it was about 1,035 mi (1,666 km) west of the southern tip of the Baja California peninsula.

Rosa made landfall around 11:00 UTC on October 2 as a 35 miles per hour (56 km/h) tropical depression, about 70 mi (115 km) southeast of Punta San Antonio on the Baja California Peninsula.

Sergio peaked around 06:00 UTC on October 4 as a Category 4 hurricane with winds of 140 miles per hour (230 km/h) and a pressure of 942 mbar (27.82 inHg), while located 825 mi (1,328 km) southwest of Cabo San Lucas, Mexico.

Increasing wind shear and lower sea surface temperatures caused Walaka to quickly weaken over the next couple of days, with the system falling to tropical storm strength by 06:00 UTC on October 5.

An increase in convection and the formation of a central dense overcast resulted in the depression being upgraded to Tropical Storm Willa by 12:00 UTC on the same day, about 290 mi (465 km) south-southwest of Manzanillo.

Willa peaked as a Category 5 hurricane on October 22 at 06:00 UTC with winds of 160 miles per hour (260 km/h) and a pressure of 925 mbar (27.32 inHg), while located 195 mi (315 km) south-southwest of Cabo Corrientes, Mexico.

Despite being located in a region of high southwesterly wind shear, disparate upper-level flows allowed the depression to intensify into Tropical Storm Xavier by 00:00 UTC on November 3.