Agwaetiti Mentawai nwere ụfọdụ sọfụ kacha mma n'ụwa. Enwere aka ekpe na ikike zuru oke n'otu mpaghara karịa ebe ọ bụla n'ụwa. Ndị Mentawais na-enweta ọzịza n'afọ niile yana oge kachasị agbanwe agbanwe n'etiti Maachị na Nọvemba. Na-efegharị ebili mmiri na-enweghị igwe mmadụ n'ọtụtụ mmiri mmiri dị iche iche, ezumike n'akụkụ osimiri, oge nkwụsịtụ na ọnụ mmiri ndị zoro ezo. Ebe okpomọkụ, mmiri na-acha anụnụ anụnụ na-acha anụnụ anụnụ na ọtụtụ ụdị ebili mmiri na-anabata ọkwa nka site na etiti ruo pro.
Ọ bụ ezie na e nwere ebili mmiri n'afọ niile, na oge "apụ" nwere ike ime ka ndị mmadụ zuo oke, oge kacha mma n'afọ bụ n'oge ọkọchị. Site na ngwụcha Machị ruo mbido Nọvemba, n'oge oyi nke ndịda ụwa, oke osimiri India na-amịpụta ahịhịa na-adịghị akwụsị akwụsị.
Agwaetiti Mentawais nwere ọnọdụ ugogbe anya nke nwere ikuku ikuku n'ime afọ 80 ruo 90, yana oge mmiri n'etiti 80 dị elu. Anyanwụ siri ike nke ukwuu n'akụkụ equator, na-eme ka ihu anyanwụ na-arụ ọrụ dị elu, ndị nche ọkụ ọkụ, okpu, na ọtụtụ hydration.
Azụmaahịa Ista na-achịkwa Mee site na Ọgọst/Septemba ma dịkwa mma maka ọtụtụ oge ezumike. N'ọnwa Nọvemba ruo Febụwarị na-enwekarị ifufe nke si n'ebe ugwu ọdịda anyanwụ, ma enwere ebe ụfọdụ na-akwado ụzọ ifufe a. Ọnwa mgbanwe, n'oge mgbanwe nke oge nke March/April na September/October nwere ìhè na ifufe na-agbanwe agbanwe. Oge ndị a na-enwekarị ugegbe ma nwee ike bụrụ oge kachasị mma maka ịlele ọtụtụ ntụpọ.