Hurricane Gamma was a tropical cyclone that brought heavy rains, flooding, and landslides to the Yucatán Peninsula in early October 2020.

Numerous tropical cyclone watches and warnings were issued for parts of Mexico in the Yucatán Peninsula following the formation of Gamma and thousands of people were evacuated.

On September 29, the National Hurricane Center began to monitor a tropical wave over the Lesser Antilles for potential development as it moved into the Western Caribbean.

[2] As it neared the coast of Honduras on October 1, the wave spawned a broad low pressure area and began to quickly organize over the unusually warm waters of the Western Caribbean.

[7] By 16:45 UTC that same day, Gamma had reached minimal Category 1 hurricane status and made landfall near Tulum, Quintana Roo, Mexico, at peak intensity, with 1-minute sustained winds of 75 mph (121 km/h) and a minimum central pressure of 978 mbar (28.9 inHg).

[8] Operationally, the NHC noted that Gamma was very near hurricane strength at the time of landfall, but kept it at high-end tropical storm status.

[11] As Gamma stalled a rapid increase in wind shear decoupled central convection by that evening, causing it to move further east than originally forecast.

[15] Operationally, Gamma was declared post tropical at 03:00 UTC on October 5 as the convection being produced around the cyclone was assessed as being due to a sea breeze boundary.

The storm weakened to a tropical depression at 18:00 UTC on October 5 and began moving southwestward due to a building mid-level ridge to its north as well as a binary interaction with the circulation of soon-to-be Hurricane Delta.

[8][18] Tropical storm watches and warnings were issued for the northeastern part of the Yucatán Peninsula when advisories were first initiated on October 2.

[8] At least 6 people died and thousands were evacuated in southeastern Mexico after Tropical Storm Gamma lashed the Yucatán Peninsula.