Deadliest meteorological events in 2023

On 6 March 2023, a series of landslides were triggered by continuous rain in Serasan Island of Serasan District, Natuna Regency, Riau Islands, Indonesia. Around 50 people were killed and four others were missing while contact to the Serasan Island was entirely lost. An entire village was reportedly buried.

An avalanche struck a road in Nyingchi at around 7:50 PM China Standard Time on 17 January 2023. Twenty-eight people were killed and 53 others were rescued, five of whom were seriously injured.

Very Intense Tropical Cyclone Freddy, also known as Severe Tropical Cyclone Freddy, was an exceptionally long-lived, powerful, and deadly tropical cyclone that traversed the southern Indian Ocean for more than five weeks in February and March 2023. Freddy was the longest-lasting tropical cyclone ever recorded worldwide, and produced the most accumulated cyclone energy—a metric used to measure the total energy generated by tropical cyclones—of any individual cyclone on record globally. Additionally, it is the third-deadliest tropical cyclone recorded in the Southern Hemisphere, only behind 2019's Cyclone Idai and the 1973 Flores cyclone.

Tropical Cyclone Cheneso was a strong tropical cyclone that affected Madagascar in January 2023. The fourth tropical storm and fifth tropical cyclone of the 2022–23 South-West Indian Ocean cyclone season, Cheneso developed out of a zone of disturbed weather status which was first monitored at RSMC La Réunion on 17 January. Despite convection wrapping into the curved band pattern, the system formed into a tropical depression on 18 January. The depression strengthened into Severe Tropical Storm Cheneso on the following day. Cheneso made landfall over northern Madagascar and weakened into an inland depression, before emerging into the Mozambique Channel. Cheneso later strengthened into a tropical cyclone on 25 January. The system continued moving southeast, before transitioning into a post–tropical depression on 29 January.

The 2023 Pakistan floods occurred from March to July of 2023, caused by monsoon rains which returned to Pakistan after nine months after the 2022 Pakistan floods. Floods worsened at the end of June due to upcoming monsoon rains. At least 159 people were killed, including many children.

During the 2023 Brazilian Carnival holiday weekend, record-breaking rainfall—reaching 682 mm (26.9 in) in 24 hours—caused deadly floods and landslides across the state of São Paulo. At least 65 people were killed, of which 64 were in São Sebastião.

Periods of heavy rainfall caused by multiple atmospheric rivers in California between December 31, 2022, and March 25, 2023, resulted in floods that affected parts of Southern California, the California Central Coast, Northern California and Nevada. The flooding resulted in property damage and at least 22 fatalities. At least 200,000 homes and businesses lost power during the December-January storms and 6,000 individuals were ordered to evacuate.

In December 2022, a series of floods began to severely affect the provinces of Misamis Occidental and Misamis Oriental, and some parts of the southern island of Mindanao in the Philippines. The floods were caused by intense rain, which poured down on the central and southern parts of the country.