List of Category 4 Pacific hurricanes

A well developed hurricane approaching Baja California, Mexico, from the south. It features a mostly circular cloud mass surrounding a defined eye.
Hurricane Odile after its peak intensity. Odile had the lowest atmospheric pressure of a Category 4 hurricane in the Pacific basin, east of 180°W, at 918 mbar (hPa; 27.11 inHg).

Category 4, the second-highest classification on the Saffir–Simpson scale,[nb 1] is used for tropical cyclones that have winds of 130–156 mph (209–251 km/h; 113–136 kn). The division of the eastern and central Pacific basins occurs at 140° W; the eastern Pacific covers area east of 140° W, while the central Pacific extends between 140° W to 180° W. Both basins' division points are at 66° N as a northern point and the equator as the southern point. As of 2024, 143 hurricanes have attained Category 4 status in the northeastern Pacific basins. This list does not include storms that also attained Category 5 status on the scale.

Numerous climatological factors influence the formation of hurricanes in the Pacific basins. The North Pacific High and Aleutian Low, usually present between January and April, cause strong wind shear and unfavorable conditions for the development of hurricanes. During its presence, El Niño results in increased numbers of powerful hurricanes through weaker wind shear, while La Niña reduces the number of such hurricanes through the opposite. Global warming may also influence the formation of tropical cyclones in the Pacific basin. During a thirty-year period with two sub-periods, the first between 1975 and 1989 and the second between 1990 and 2004, an increase of thirteen Category 4 or 5 storms was observed from the first sub-period.

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