Five days of heavy rains and winds have pounded Rohingya camps in the district displacing over 2,700, damaging over 3,400 houses and leaving two people dead, said IOM on Monday.
"We're only half way into the monsoon season and helped over 2,000 people in the past 72 hours. Our teams have been working round the clock," said spokesman of International Organization for Migration (IOM) George McLeod on Monday.
Preliminary damage estimates have already exceeded those recorded in 2018, McLeod added.
The destruction - triggered by monsoon weather systems sweeping into the Bay of Bengal - saw IOM staff and volunteers working throughout the camps to repair damaged structures and relocate the hardest-hit families to emergency shelters, according to an IOM media release.
Records from rain gauges between July 3-5 in the Kutupalong mega camp showed 510 mm while camp 16 - another major settlement - recorded 530 mm.
IOM and partners, including UNHCR and WFP, have been preparing for the monsoon and cyclone season since late 2018 through infrastructure upgrades and awareness-raising campaigns in both the camps and host communities.
IOM preliminary damage data covering the period July 2-6 includes 1,186 households affected by landslides, 216 households impacted by flooding, 1,840 households affected by wind, 15,534 people affected by flooding or other safety risks, 391 landslides and 51 wind storms.
As of Sunday night, IOM damage reports for the previous 24-hour period indicated 13 more landslides, nine windstorms and two floods affecting 2,200 individuals and 432 households.
The rains and wind are expected to continue this week.