Boise Future Trends
Idaho · US States · Trend-based projections to 2050
This page uses Boise'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 Boise's projected trends
How warm will Boise be in 2050?
Extrapolated from Boise's own record since 1976, the average daytime high in 2050 works out at roughly 19.2°C, up 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 Boise?
The 2050 range runs from 18.5°C to 20.0°C. That spread comes from the 95% confidence interval on the trend line's own slope, so the noisier Boise's record, the wider the band. The trend accounts for 36% of the variation between years; the rest is ordinary year-to-year swing.
How many days above 30°C will Boise get in 2050?
The trend line lands on roughly 91 days above 30°C a year in 2050, against 86 in 2025. These are the days that set peak cooling demand, so this figure matters more for grid planning and building design than the annual average above.
Will Boise still get frost in 2050?
The trend line lands on roughly 94 frost days a year in 2050, against 86 in 2025. Fewer frost days sounds pleasant, but it also shortens the natural cold period plants and pest control rely on.
Is Boise getting wetter or drier by 2050?
The trend line lands on roughly 337mm of precipitation a year in 2050, against 448mm 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 Boise get more sunshine by 2050?
The trend line lands on roughly 3616 sunshine hours a year in 2050, against 3654 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.
