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Hilo (/ËhiËloÊ/) is the largest city, census-designated place (CDP), and settlement in Hawaii County, Hawaii, which encompasses the Island of HawaiÊ»i. The population was 40,759 at the 2000 census. The population increased by 6.1% to 43,263 at the 2010 census.
Average Temperatures for Hilo. Hilo's coldest month is February when the average temperature overnight is 63.5Â°F. In September, the warmest month, the average day time temperature rises to 83.4Â°F.