Idaho local data guide

Boise, Idaho Current Weather Forecast

As of September 16, 2026, the National Weather Service forecasts a sunny day for Boise with a high near 82°F, shifting to partly cloudy overnight with a low of 57°F and a chance of late-night precipitation.

Updated with grounded research as of 2026-09-16.

The short answer

The Boise, Idaho weather forecast for September 16, 2026, predicts a high temperature of 82°F under sunny skies. Conditions are expected to transition to partly cloudy during the evening, with a low near 57°F and a 30% chance of showers and thunderstorms developing after midnight.

Key facts

Forecast High (Sept 16, 2026)
82°F
Forecast Low (Sept 16, 2026)
57°F
Overnight Precipitation Risk
30% chance of showers and thunderstorms after midnight

Daily Weather Outlook

Boise residents can expect a standard late-summer day today, characterized by sunny conditions and warm afternoon temperatures suitable for outdoor activities. As the sun sets, the atmosphere will shift, bringing increased cloud cover and a moderate chance of nocturnal precipitation.

Planning for Local Conditions

The temperature drop from an 82°F high to a 57°F low indicates significant diurnal cooling, typical of the high-desert climate in the Treasure Valley. Those planning evening events or late-night commutes should remain mindful of the 30% chance of showers and potential thunderstorms arriving after midnight.

Climate Context

September in Boise marks the transition from the arid heat of summer to the milder, cooler temperatures of autumn. While daytime highs often remain warm, the region frequently experiences sharp drops in temperature after sunset, making layering essential for anyone navigating local transit or outdoor real estate viewings.

Common questions

Is the weather in Boise typically this warm in mid-September?

Yes, September is generally a pleasant month in Boise, though daytime temperatures can fluctuate significantly. Average highs often sit in the 70s and 80s, while nighttime lows frequently dip into the 40s and 50s.

Where can I monitor real-time weather alerts for the Treasure Valley?

The National Weather Service office in Boise provides the most accurate, localized, and real-time data for the region, including severe weather watches and warnings.

Related Idaho questions

  • What is the typical September climate for Boise, Idaho?
  • Where can I find current air quality reports for Boise?

Sources and verification