The 2024 Pacific hurricane season was the annual cycle of tropical cyclone formation over the Pacific Ocean north of the equator and east of the International Date Line (IDL). The season officially began on May 15 in the Eastern Pacific proper (east of 140°W) and June 1 in the Central Pacific (140°W to the IDL), and ended on November 30 in both areas. This is historically the period during which most tropical cyclogenesis occurs in these respective areas. The season's first system, Tropical Storm Aletta, developed on July 4, marking the latest start to a season since the satellite era began in 1966. The season's final system, Tropical Depression , dissipated on November 7.

Tropical cyclone activity was generally below average during the 2024 season. A total of fourteen nameable tropical storms developed, with five becoming hurricanes and three intensifying into major hurricanes—Category 3 or higher on the five-level Saffir–Simpson scale. Two systems—hurricanes Gilma and Hone—existed in the Central Pacific basin. A fifteenth tropical depression formed that did not reach tropical storm strength. Hurricane John was the only tropical cyclone to make landfall this season, doing so twice in Mexico—first as a Category 3 hurricane, then as a tropical storm. John's slow movement near and over mountainous terrain resulted in prolonged heavy rainfall, which in turn caused catastrophic flooding that was estimated to have killed people and wrought US$2.45 billion in damage.

This timeline documents tropical cyclone formations, strengthening, weakening, landfalls, and dissipations during the season. It includes information that was not released throughout the season, meaning that data from post-storm reviews by the National Hurricane Center has been included.

The time stamp for each event is first stated using Coordinated Universal Time (UTC), the 24-hour clock where 00:00 = midnight UTC. The NHC uses both UTC and the time zone where the center of the tropical cyclone is currently located. The time zones utilized (east to west) are: Central, Mountain, Pacific and Hawaii. In this timeline, the respective area time is included in parentheses. Additionally, figures for maximum sustained winds and position estimates are rounded to the nearest 5 units (miles, or kilometers), following National Hurricane Center practice. Direct wind observations are rounded to the nearest whole number. Atmospheric pressures are listed to the nearest millibar and nearest hundredth of an inch of mercury. __TOC__

Timeline

May No tropical cyclones form in the Eastern Pacific basin during the month of May.

May 15 The 2024 Eastern Pacific hurricane season officially begins.

June No tropical cyclones form in the Eastern or Central Pacific basins during the month of June. June 1 The 2024 Central Pacific hurricane season officially begins.

July July 4

06:00 UTC (12:00 a.m. CST) at Tropical Depression forms from a tropical wave about south of Manzanillo, Colima. 12:00 UTC (6:00 a.m. CST) at Tropical Depression strengthens into Tropical Storm Aletta about 160 mi (260 km) south-southwest of Manzanillo; it simultaneously reaches its peak intensity, with maximum sustained winds of and a minimum barometric pressure of .

July 5 06:00 UTC (11:00 p.m. MST, July 4) at Tropical Storm Aletta weakens into a tropical depression about 270 mi (435 km) west of Manzanillo.

July 6 00:00 UTC (5:00 p.m. MST, July 5) at Tropical Depression Aletta degenerates into a remnant low about 445 mi (715 km) west of Manzanillo, and later dissipates.

July 24 12:00 UTC (5:00 a.m. MST) at The second tropical depression of the season forms from an area of unsettled weather about south of Cabo San Lucas, Baja California Sur. 18:00 UTC (11:00 a.m. MST) at The second tropical depression of the season strengthens into Tropical Storm Bud about 430 mi (695 km) south-southwest of Cabo San Lucas.

July 25

06:00 UTC (11:00 p.m. MST, July 24) at Tropical Storm Bud reaches its peak intensity, with maximum sustained winds of and a minimum barometric pressure of , about 435 mi (705 km) southwest of Cabo San Lucas.

July 26 06:00 UTC (11:00 p.m. PDT, July 25) at Tropical Storm Bud degenerates into a post-tropical cyclone about 615 mi (990 km) west-southwest of Cabo San Lucas, and subsequently dissipates.

July 31 06:00 UTC (11:00 p.m. MST, July 30) at Tropical Depression forms from a tropical wave south-southwest of Manzanillo, Colima. 12:00 UTC (5:00 a.m. MST) at Tropical Depression strengthens into Tropical Storm Carlotta about 320 mi (520 km) south-southwest of Manzanillo.

August August 2

06:00 UTC (11:00 p.m. MST, August 1) at Tropical Storm Carlotta strengthens into a Category 1 hurricane about 80 mi (130 km) east-southeast of Clarion Island.

August 3 00:00 UTC (5:00 p.m. PDT, August 2) at The fourth tropical depression of the season forms from an area of unsettled weather about west-southwest of the southern tip of the Baja California peninsula. 06:00 UTC (11:00 p.m. PDT, August 2) at Hurricane Carlotta reaches its peak intensity, with maximum sustained winds of and a minimum barometric pressure of , about 240 mi (390 km) west of Clarion Island. 06:00 UTC (11:00 p.m. PDT, August 2) at The fourth tropical depression of the season strengthens into Tropical Storm Daniel about west-southwest of the southern tip of the Baja California peninsula.

August 4 12:00 UTC (5:00 a.m. PDT) at Hurricane Carlotta weakens into a tropical storm about 580 mi (935 km) west of Clarion Island. 12:00 UTC (5:00 a.m. MST) at Tropical Depression forms from an area of low pressure about 605 mi (975 km) west-southwest of Manzanillo, Colima. 18:00 UTC (11:00 a.m. PDT) at Tropical Storm Daniel reaches its peak intensity, with maximum sustained winds of 40 mph (65 km/h) and a minimum barometric pressure of , about west-southwest of the southern tip of the Baja California peninsula.

August 5 00:00 UTC (5:00 p.m. MST, August 4) at Tropical Depression strengthens into Tropical Storm Emilia about 660 mi (1,065 km) west-southwest of Manzanillo. 12:00 UTC (5:00 a.m. MST) at Tropical Storm Fabio forms from an area of low pressure about south-southwest of Manzanillo. 18:00 UTC (11:00 a.m. PDT) at Tropical Storm Daniel weakens into a tropical depression about west-southwest of the southern tip of the Baja California peninsula, and subsequently dissipates.

August 6

00:00 UTC (5:00 p.m. PDT, August 5) at Tropical Storm Carlotta degenerates into a post-tropical cyclone about 885 mi (1,425 km) west of Clarion Island, and subsequently dissipates. 12:00 UTC (5:00 a.m. MST) at Tropical Storm Fabio reaches its peak intensity, with maximum sustained winds of and a minimum barometric pressure of , about west-southwest of Manzanillo.

August 7 06:00 UTC (11:00 p.m. PDT, August 6) at Tropical Storm Emilia reaches its peak intensity, with maximum sustained winds of 70 mph (110 km/h) and a minimum barometric pressure of , about 775 mi (1,250 km) west-southwest of Manzanillo. 18:00 UTC (11:00 a.m. PDT) at Tropical Storm Fabio transitions to a post-tropical cyclone about west of Manzanillo, and is subsequently absorbed by Tropical Storm Emilia.

August 8 18:00 UTC (11:00 a.m. PDT) at Tropical Storm Emilia degenerates into a remnant low about 1,280 mi (2,055 km) west of Manzanillo.

August 18 06:00 UTC (11:00 p.m. MST, August 17) at Tropical Depression forms from an interaction between a tropical wave and the monsoon trough about 610 mi (980 km) south of the southern tip of the Baja California peninsula. 18:00 UTC (11:00 a.m. MST) at Tropical Depression strengthens into Tropical Storm Gilma about 580 mi (935 km) south of the southern tip of the Baja California peninsula.

August 21 06:00 UTC (11:00 p.m. PDT, August 20) at Tropical Storm Gilma strengthens into a Category 1 hurricane about 915 mi (1,475 km) west-southwest of the southern tip of the Baja California peninsula. 18:00 UTC (11:00 a.m. PDT) at Hurricane Gilma strengthens to Category 2 intensity about 975 mi (1,565 km) west-southwest of the southern tip of the Baja California peninsula.

August 22

00:00 UTC (5:00 p.m. PDT, August 21) at Hurricane Gilma strengthens to Category 3 intensity about 990 mi (1,595 km) west-southwest of the southern tip of the Baja California peninsula, making it the first major hurricane of the season. 00:00 UTC (5:00 p.m. PDT, August 21) at Tropical Depression forms about 1,190 mi (1,920 km) east-southeast of Hilo, Hawaii. 12:00 UTC (5:00 a.m. PDT) at Hurricane Gilma reaches its initial peak intensity, with maximum sustained winds of 125 mph (205 km/h) and a barometric pressure of , about 1,035 mi (1,665 km) west-southwest of the southern tip of the Baja California peninsula. 18:00 UTC (8:00 a.m. HST) at Tropical Depression strengthens into Tropical Storm Hone about 940 mi (1,510 km) east-southeast of Hilo.

August 23 18:00 UTC (11:00 a.m. PDT) at Hurricane Gilma weakens to Category 2 intensity about 1,180 mi (1,900 km) west-southwest of the southern tip of the Baja California peninsula.

August 24 18:00 UTC (11:00 a.m. PDT) at Hurricane Gilma restrengthens to Category 3 intensity about 1,380 mi (2,225 km) west-southwest of the southern tip of the Baja California peninsula.

August 25

00:00 UTC (2:00 p.m. HST, August 24) at Hurricane Gilma strengthens to Category 4 intensity about 1,435 mi (2,305 km) west-southwest of the southern tip of the Baja California peninsula. It simultaneously reaches its peak intensity, with maximum sustained winds of 130 mph (215 km/h) and a minimum barometric pressure of . 06:00 UTC (8:00 p.m. HST, August 24) at Tropical Storm Hone strengthens into a Category 1 hurricane about 115 mi (185 km) south of Hilo. 06:00 UTC (11:00 p.m. PDT, August 24) at The eighth tropical depression of the season forms from an area of low pressure about 800 mi (1,290 km) southwest of the southern tip of the Baja California peninsula. 12:00 UTC (5:00 a.m. PDT) at Hurricane Gilma weakens to Category 3 intensity about 1,540 mi (2,485 km) west of the southern tip of the Baja California peninsula. 12:00 UTC (2:00 a.m. HST) at Hurricane Hone reaches its peak intensity, with maximum sustained winds of 85 mph (140 km/h) and a minimum barometric pressure of , about 50 mi (85 km) south of South Point, Hawaii. 12:00 UTC (5:00 a.m. PDT) at The eighth tropical depression of the season strengthens into Tropical Storm Hector about 865 mi (1,390 km) southwest of the southern tip of the Baja California peninsula.

August 26 00:00 UTC (5:00 p.m. PDT, August 25) at Hurricane Gilma weakens to Category 2 intensity about 1,645 mi (2,650 km) west of the southern tip of the Baja California peninsula. 00:00 UTC (2:00 p.m. HST, August 25) at Hurricane Hone weakens into a tropical storm about 160 mi (260 km) south of Honolulu, Hawaii.

August 27 00:00 UTC (5:00 p.m. PDT, August 26) at Tropical Storm Hector reaches its peak intensity, with maximum sustained winds of 60 mph (95 km/h) and a minimum barometric pressure of , about 1,135 mi (1,825 km) west-southwest of the southern tip of the Baja California peninsula. 12:00 UTC (2:00 a.m. HST) at Hurricane Gilma weakens to Category 1 intensity about 1,975 mi (3,180 km) west of the southern tip of the Baja California peninsula, shortly after crossing over into the Central Pacific basin. 18:00 UTC (8:00 a.m. HST) at Hurricane Gilma weakens into a tropical storm about 2,060 mi (3,315 km) west of the southern tip of the Baja California peninsula.

August 28 18:00 UTC (11:00 a.m. PDT) at Tropical Storm Hector degenerates into a post-tropical cyclone about 1,535 mi (2,475 km) west-southwest of the southern tip of the Baja California peninsula.

August 29 12:00 UTC (2:00 a.m. HST) at Tropical Storm Gilma weakens into a tropical depression about 2,585 mi (4,160 km) west of the southern tip of the Baja California peninsula.

August 30