1940–49 Pacific typhoon seasons
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| Duration | February 1 – February 1 |
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| Peak intensity | Winds not specified |
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| Duration | April 9 – April 13 |
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| Peak intensity | Winds not specified |
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| Duration | April 21 – April 28 |
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| Peak intensity | Winds not specified |
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| Duration | June 9 – June 16 |
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| Peak intensity | Winds not specified |
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| Duration | July 1 – July 4 |
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| Peak intensity | Winds not specified |
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| Duration | June 29 – July 9 |
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| Peak intensity | Winds not specified |
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| Duration | July 4 – July 16 |
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| Peak intensity | Winds not specified |
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| Duration | July 11 – July 12 |
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| Peak intensity | Winds not specified |
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| Duration | July 12 – July 26 |
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| Peak intensity | Winds not specified |
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| Duration | July 13 – July 14 |
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| Peak intensity | Winds not specified |
The decade of the 1940s featured the 1940–49 Pacific typhoon seasons. The seasons had no official bounds, but most tropical cyclones tend to form in the northwestern Pacific Ocean between June and December. These dates conventionally delimit the period of each year when most tropical cyclones form in the northwestern Pacific Ocean.
The scope of this article is limited to the Pacific Ocean, north of the equator and west of the international date line. Storms that form east of the date line and north of the equator are called hurricanes; see 1940–1948 Pacific hurricane seasons. Tropical storms formed in the entire west pacific basin were assigned a name by the Joint Typhoon Warning Center.
A short lived system, the IBTrACS database contains only three 6-hour positions on the western side of the Philippines. Historical weather maps show only a circulation near 9 N 121 E. This was a weak system, likely a depression but may have been a briefly reached Tropical Storm strength.
Monthly Weather Review for April 1940 describes this as a depression of minor importance which formed near the western Carolina Islands. It moved westward passing close to and south of Yap before dissipating. The Historical Weather Map shows the system as a Tropical Storm (winds between 34 and 64 knots) from April 11 to April 13 before disintegrating into a low pressure area west of Luzon in the Philippines.
Described in Monthly Weather Review as a "typhoon, violent over a small area" that passed across northeast Mindanao. Towns along the eastern and northern coast experienced strong winds for a short time and heavy rains. On April 26 the ship S.S. Tjieboet from a position near 8 30' N 127 00' E reported winds of force 10 to 12 and a pressure of 738.8 mm (985.0 mb). Three lives were reported lost when the motorboat Fookien sank near 8 38' N 126 05'E.
The Historical Weather Map shows a depression near 7 N 143 E on April 21 and a Tropical Storm between April 22 and April 23. Thphoon winds were analyzed between April 24 and 27 as the system crossed into the South China Sea. By April 29, only a broad low pressure area remained near 8 N 113 E.
Monthly Weather Review describes this cyclone as a Typhoon first noted 300 miles east of Yap on June 10, 1940. Performing an anti-cyclonic loop near 17 N 132 E the system was tracked to the south of Japan where it apparently underwent extratropical transition. No loss of life was reported from Japan with this system.
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