Honolulu Future Trends
Hawaii · US States · Trend-based projections to 2050
This page uses Honolulu's own 50 year weather record to project one trend line forward to 2030, 2040 and 2050, with a Best and Worst scenario range built from the trend's own statistical uncertainty. For where that trend has already gone, see the Climate Capitals Trends, or for current and historical day-to-day weather, see Meteo Capital Cities. See how this trend ranks against every other world capital on the Climate Shift Index.Compare its projection against all 195 world capitals on the full interactive map.
Data through August 4, 2026.
Frequently asked questions about Honolulu's projected trends
How warm will Honolulu be in 2050?
Extrapolated from Honolulu's own record since 1976, the average daytime high in 2050 works out at roughly 27.7°C, down 0.3°C from 2025. This is a straight-line projection of measured weather data, not a climate model or a scenario-based forecast.
How certain is the temperature projection for Honolulu?
The 2050 range runs from 27.3°C to 28.1°C. That spread comes from the 95% confidence interval on the trend line's own slope, so the noisier Honolulu's record, the wider the band. The trend accounts for 57% of the variation between years; the rest is ordinary year-to-year swing.
How many days above 30°C will Honolulu get in 2050?
The trend line lands on roughly 20 days above 30°C a year in 2050, against 45 in 2025. So no increase here, which means the warming in this city sits in the milder months rather than the summer peaks.
Will Honolulu still get frost in 2050?
Honolulu already recorded no frost days in 2025, and the trend line does not change that. Frost is not a useful measure here, though the heat figures above are.
Is Honolulu getting wetter or drier by 2050?
The trend line lands on roughly 365mm of precipitation a year in 2050, against 515mm in 2025, so drier. An annual total says little about distribution though: the same rainfall can arrive in shorter, harder bursts, and that is what loads drains and water storage.
Will Honolulu get more sunshine by 2050?
The trend line lands on roughly 4108 sunshine hours a year in 2050, against 4127 in 2025, so less sun. Sunshine hours bear directly on rooftop solar yield, though heat works against it at the same time: a panel loses efficiency at high temperatures.
