By mid-century, temperatures in Hawai'i are expected to rise by 1-3 degrees F. By late century, under a high emissions scenario, temperatures are expected to rise by 4-5 degrees F.

Temperatures in Hawai'i have warmed by 0.76 degrees F over the past 100 years. Periods of warming and cooling have occurred over the past century, with a statistically significant trend toward warmer temperatures. Warming is occurring at both high and low elevations, although higher elevation areas have been warming faster than lower elevations over the past 30 years. Much of the warming can be attributed to higher minimum temperatures.