The 2017 Pacific typhoon season was a below-average season in terms of accumulated cyclone energy and the number of typhoons and super typhoons, and the first since the 1977 season to not produce a Category 5-equivalent typhoon on the Saffir–Simpson scale. The season produced a total of 27 named storms, 11 typhoons, and only two super typhoons, making it an slightly above-average season in terms of storm numbers. It was an event in the annual cycle of tropical cyclone formation, in which tropical cyclones form in the western Pacific Ocean. The season runs throughout 2017, though most tropical cyclones typically develop between May and October. The season's first named storm, Muifa, developed on April 25, while the season's last-named storm, Tembin, dissipated on December 26. This season also featured the latest occurrence of the first typhoon of the year since 1998, with Noru reaching this intensity on July 23.

This timeline documents all of the events of the 2017 Pacific typhoon season. Most of the tropical cyclones forming between May and November. The scope of this article is limited to the Pacific Ocean, north of the equator between 100°E and the International Date Line. During the season, 42 systems were designated as tropical depressions by either, the Japan Meteorological Agency (JMA), the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA), the United States' Joint Typhoon Warning Center (JTWC), or other National Meteorological and Hydrological Services such as the China Meteorological Administration and the Hong Kong Observatory. As they run the Regional Specialized Meteorological Centre for the Western Pacific, the JMA assigns names to tropical depressions should they intensify into a tropical storm. Tropical depressions that form in this basin are given a number with a "W" suffix by the JTWC. PAGASA also assigns local names to tropical depressions which form within or enter their area of responsibility; however, these names are not in common use outside of PAGASA's area of responsibility. In this season, 22 systems entered or formed in the Philippine Area of Responsibility (PAR), of which 10 of them made landfall over the Philippines, a record-high number since 2009. __TOC__

Timeline

January January 1 00:00 UTC — The 2017 Pacific typhoon season officially begins.

January 7 00:00 UTC At — The JMA classifies a tropical depression located over the Philippine Sea east of Mindanao. (08:00 PHT) at — The PAGASA designates the tropical depression east of Mindanao as Auring. 06:00 UTC At — The JMA assesses Auring to have attained 10-minute sustained winds of and a central pressure of 1002 hPa. (14:00 PHT) at — The PAGASA also assesses Auring to have attained 10-minute sustained winds of but with a lower central pressure of 1000 hPa.

January 8 00:00 UTC at — The JTWC starts tracking on Auring as a tropical depression, designating it 01W while it nears Mindanao. 06:00 UTC at — The JMA analyzes 01W (Auring)'s central pressure slightly fell to 1002 hPa as it was about to landfall. 07:00 UTC (15:00 PHT) at — Tropical Depression 01W (Auring) makes its first landfall on Siargao Island, Surigao del Norte. 08:00 UTC (16:00 PHT) at — Tropical Depression 01W (Auring) makes its second landfall on the province of Dinagat Islands. 10:00 UTC (18:00 PHT) at — Tropical Depression 01W (Auring) strikes the southern tip of Panaon Island, Southern Leyte for its third landfall. 12:00 UTC at — The JTWC analyzes 01W (Auring) to have attained its peak 1-minute sustained winds of as it traverses Bohol Sea. 18:00 UTC at — After attaining its strongest winds, the JTWC also assesses 01W (Auring)'s central pressure had dropped to 1000 hPa as it closes in on Bohol. 20:45 UTC (04:45 PHT, January 9) at — Tropical Depression 01W (Auring) makes its fourth and final landfall on Ubay, Bohol.

January 9 00:00 UTC (08:00 PHT) at — The PAGASA downgrades 01W (Auring) to a low-pressure area after making multiple landfalls in the archipelago. 06:00 UTC At — After a brief increase in pressure, the JMA analyzes 01W's central pressure slightly fell to 1004 hPa. At — The JTWC also assesses 01W has weakened to a tropical wave. 12:00 UTC at — The JMA downgrades 01W to a low-pressure area as it crosses Visayas.

January 11 06:00 UTC at — The JMA starts re-tracking the remnant low of Ex-01W as a tropical depression now located over the South China Sea.

January 12 06:00 UTC at — The JMA analyzes Ex-01W's central pressure had slightly dropped to 1004 hPa as it continues to move westwards.

January 13 06:00 UTC at — Tropical Depression Ex-01W's central pressure slightly drops again to 1004 hPa after pressure fluctuations. 18:00 UTC at — The JTWC reports the remnants of 01W has regained tropical depression status and subsequently peaked with 1-minute sustained winds of and a central pressure of 1004 hPa.

January 14 18:00 UTC at — The JTWC downgrades 01W again to a weather disturbance as it moves to the west-southwest.

January 16 00:00 UTC at — The JMA last notes Tropical Depression Ex-01W as it nears the coast of Vietnam; the depression dissipates six hours later.

February

February 3 06:00 UTC At — A tropical depression forms near Palau over the Philippine Sea. The JMA analyzes the system having 10-minute sustained winds of and a central pressure of 1002 hPa. (14:00 PHT) at — The PAGASA names the tropical depression near Palau as Bising as it was within the PAR. The agency assesses the system having 10-minute sustained winds of and a central pressure of 1004 hPa.

February 4 06:00 UTC at — The JMA analyzes Tropical Depression Bising had attained a lower central pressure of 1000 hPa. 18:00 UTC at — Tropical Depression Bising re-attains its lowest central pressure of 1000 hPa.

February 5 06:00 UTC at — Tropical Depression Bising's central pressure briefly drops to 1002 hPa as it starts to move to the north-northeast. 18:00 UTC at — Tropical Depression Bising's central pressure fluctuates, slightly dropping back to 1002 hPa.

February 6 06:00 UTC At — Tropical Depression Bising's central pressure briefly drops to 1002 hPa again as it continues its generally northward movement. (14:00 PHT) at — Tropical Depression Bising weakens to a low-pressure area, according to the PAGASA as it was now located to the east of Bicol Region. 18:00 UTC at — Tropical Depression Ex-Bising's central pressure continues to fluctuate, dropping back to 1002 hPa as it starts to turn south.

February 7 06:00 UTC at — The JMA analyzes Ex-Bising's central pressure briefly drops to 1002 hPa again. 18:00 UTC at — As Ex-Bising meanders in the same area, its central pressure drops back to 1002 hPa for the final time. Six hours later, the JMA finally downgrades Ex-Bising to a low-pressure area east of Visayas.

March March 19 00:00 UTC at — The JMA reports a tropical depression has formed west-northwest of Palau. 06:00 UTC at — The tropical depression west-northwest of Palau attains its lowest central pressure of 1008 hPa as it moves west-northwest.

March 20 18:00 UTC at — After crossing Leyte Island, the tropical depression formerly west-northwest of Palau re-attains its lowest central pressure of 1008 hPa over the Visayan Sea.

March 21 06:00 UTC at — The JMA last notes the tropical depression formerly over the Visayan Sea after having crossed Masbate Island and had now emerged over the Sibuyan Sea; the depression dissipates six hours later.

April April 13 00:00 UTC at — A tropical depression forms nearly northeast of Palau with a central pressure of 1008 hPa.

April 14 06:00 UTC At — The tropical depression now to the west-northwest of Palau attains 10-minute sustained winds of and a central pressure of 1006 hPa as it nears Visayas. (14:00 PHT) at — The PAGASA names the tropical depression nearing Visayas as Crising, assessing the system having reached its lowest central pressure at 1004 hPa.

April 15 00:00 UTC (08:00 PHT) at — The PAGASA reports Tropical Depression Crising attains its peak 10-minute sustained winds of as it continues moving toward Samar Island. 06:00 UTC at — The JMA reports Crising re-attained its lowest central pressure of 1006 hPa. 10:30 UTC (18:30 PHT) at — Tropical Depression Crising strikes Hernani, Eastern Samar. 12:00 UTC (20:00 PHT) at — The PAGASA assesses Crising has weakened to a remnant low as it continues to cross Samar Island.

April 16 06:00 UTC at — After crossing Visayas and emerging off Panay Island, the JMA determines Ex-Crising re-attained a central pressure of 1008 hPa. 18:00 UTC at — Tropical Depression Ex-Crising's central pressure slightly drops to 1008 hPa after briefly fluctuating as the system moves over the South China Sea.

April 18 00:00 UTC at — The JTWC designates Ex-Crising as 02W as it moves north-northeast over the South China Sea. Subsequently, the agency determines the system peaked with 1-minute sustained winds of and a central pressure of 1004 hPa. 06:00 UTC at — Tropical Depression 02W re-attains a central pressure of 1008 hPa for the fourth time, according to the JMA.

April 19 06:00 UTC at — 02W's central pressure fluctuates down to 1008 hPa for the final time as it turns to the northeast. 12:00 UTC at — The JTWC downgrades 02W to a weather disturbance as it enters Luzon Strait.

April 20 00:00 UTC at — The JMA last notes Ex-02W as it moves northeastward across the Luzon Strait; the system dissipates six hours later.

April 22 18:00 UTC at — The JMA determines the formation of a tropical depression south of Guam.

April 25 00:00 UTC at — The JTWC designates the tropical depression now west-southwest of Guam as 03W with its pressure dropping to 1004 hPa as it slows down while moving west-northwest. 18:00 UTC At — The JMA upgrades 03W to a tropical storm, naming it Muifa, becoming the first named storm of the season. Subsequently, it peaked with 10-minute sustained winds of and a central pressure of 1002 hPa. At — The JTWC follows suit and upgrades Muifa to a tropical storm as well.

April 26 00:00 UTC (08:00 PHT) at — The PAGASA reports Tropical Storm Muifa had entered the PAR and was named Dante while at its peak intensity of 10-minute sustained winds of and a central pressure of 998 hPa. 18:00 UTC at — The JTWC assesses Muifa (Dante) has attained its peak intensity with 1-minute sustained winds of and a central pressure of 993 hPa as it turns to the north-northeast.

April 27 06:00 UTC at — The JMA downgrades Muifa (Dante) back to a tropical depression. 12:00 UTC At — The JTWC follows suit and downgrades Muifa (Dante) to a tropical depression as it picks up speed. (20:00 PHT) at — The PAGASA follows suit and downgrades Muifa (Dante) to a tropical depression as it was about to leave the PAR. 14:00 UTC (22:00 PHT) at — The PAGASA reports Muifa (Dante) has left the PAR.

April 28 00:00 UTC at — The JTWC downgrades Muifa further to a weather disturbance as it moves northeast.

April 29 06:00 UTC at — The JMA last notes Muifa as it becomes embedded on a stationary front; the depression fully embeds six hours later.

May There is no tropical cyclone activity during May.

June June 10 00:00 UTC at — The JMA marks a tropical depression over the South China Sea west of Mindoro. 18:00 UTC at — The JTWC tags the tropical depression west of Mindoro as Tropical Depression 04W.

June 11 00:00 UTC at — The JMA upgrades 04W to a tropical storm, naming it Merbok as it moves generally northwards. 06:00 UTC at — The JTWC reports Merbok has strengthened to a tropical storm with its pressure slightly dropping to 996 hPa on their analysis.

June 12 00:00 UTC at — The JTWC reports Tropical Storm Merbok has peaked with 1-minute sustained winds of and a central pressure of 989 hPa as it nears South China. 06:00 UTC at — The JMA further upgrades Merbok to a severe tropical storm as it moves closer to land.