From Wikipedia: Heʻeia is a census-designated place comprising several neighborhoods located in the city and county of Honolulu and the Koʻolaupoko district on the island of Oʻahu north of Kāneʻohe.
i ke kau kupulau = in the spring
i ke kau wela = in the summer
i ke kau hāʻulelau = in the fall
i ke kau hoʻoilo = in the winter
From "Spoken Hawaiian" by Samuel H. Elbert (University of Hawaii Press, 1970): Pronunciation of Hawaiian (intro/no page number):" o as in only (malo, malu, pao, pau); u as the oo in moon, with well-rounded lips...
A before i and u sometimes assimilates to e and o: kaikaina is usually keikeina, ikaika is ikeika; mao is sometimes mou.
A is probably shorter before i and u than before e and o...
[I've read that fast-spoken Hawaiian, as with any language, sounds a little different than slowly, carefully enunciated spoken Hawaiian.]
I've noticed when reading the prompts out loud that, if I try to go too fast, my o's and u's start to blend together and sometimes form an "euh" sound. I don't know if this also happens to experienced speakers, but that may explain it, especially since I don't hear an outright "Oh" sound there.