Heat stress in Boise
High-desert heat — hot, dry, sun-drenched summer afternoons trending hotter in recent years.
Heat stress is low right now — normal outdoor activity is fine.
Wet-bulb globe temperature via the Liljegren (2008) method. This page is cached and refreshes in the background, so the live badge below can be a few minutes ahead of it.
View Boise on the live mapOutdoor plans are fine. Normal hydration is enough for anyone in good health.
Screening guidance from ACGIH TLV, GHSA/KSI/NATA, and TB MED 507. WBGT is a composite index, not air temperature. These are acclimatized-population defaults — the unacclimatized, older, ill, or those on certain medications are at higher risk. Not a substitute for a required on-site WBGT reading or your employer / league / command policy.
Reading heat stress in Boise
Wet-bulb globe temperature (WBGT) is the heat measure that actually tracks danger to the body. Unlike the plain air temperature on your phone, it folds in humidity, wind, and direct sun — the factors that decide whether your sweat can still cool you. It’s the standard the military, athletic associations, and occupational-safety bodies use to call when outdoor activity is no longer safe.
That matters in Boise because high-desert heat — hot, dry, sun-drenched summer afternoons trending hotter in recent years. The number above is the live outdoor WBGT for the city right now; tap through to the live map to inspect any neighborhood, scrub the forecast hour by hour, and see the 7-day outlook.
How hot Boise usually gets
Across 2015–2024, Boise averaged a 89°F daily high in summer — above the median for the cities we track, and July is typically the warmest month.
Summer humidity averages only about 32%, so sweat evaporates efficiently — the danger here is sun and raw heat rather than mugginess.
Daily high temperatures and humidity from ERA5 reanalysis, 2015–2024 (hottest day in the sample: 2021-07-26). These are climate averages for context — the reading at the top of this page is the live one.
Heat in Boise: common questions
How hot does it usually get in Boise?
Across 2015–2024, Boise averaged a 89°F daily high through summer, with about 55 days a year at or above 90°F and 11 at or above 100°F. July is typically the hottest month, and the hottest day in that sample reached 107°F. Figures are from ERA5 daily reanalysis.
When is the hottest time of year in Boise?
July has the highest average daily high in Boise. Summer humidity averages only about 32%, so sweat evaporates efficiently — the danger here is sun and raw heat rather than mugginess. Use the forecast on this page to plan around the specific days that matter.
What is the WBGT in Boise right now?
The reading at the top of this page is the current wet-bulb globe temperature for Boise, Idaho, computed from live weather by the Liljegren (2008) method and labelled with how recently it updated. For an exact reading at your own neighbourhood, plus an hour-by-hour forecast, open the live map.
Why is WBGT more useful than the temperature for Boise?
Air temperature ignores humidity, wind, and sun — the things that decide whether heat is dangerous. Boise's climate (high-desert heat — hot, dry, sun-drenched summer afternoons trending hotter in recent years.) is exactly why a single "feels-like" or thermometer reading can understate the real risk. WBGT captures all of it in one number.
When is heat most dangerous in Boise?
Heat stress typically peaks in the early-to-mid afternoon, when sun load is highest. Plan strenuous outdoor activity for early morning or evening, hydrate ahead of time, and use the forecast scrubber on the live map to find the safest window.
Is WetBulbTracker free to use for Boise?
Yes. WetBulbTracker is free, needs no account, and works for anywhere on Earth — not just Boise. You can install it to your home screen and even set heat alerts.
Put Boise’s live heat stress on your site
A self-updating WBGT badge for schools, teams, camps, and local sites — it always shows the current reading and links back here.
<iframe src="https://wetbulbtracker.com/embed/boise-id" width="340" height="150" style="border:0" title="Live WBGT — Boise, ID" loading="lazy"></iframe>Paste it into any website. The badge updates itself and links back here. Add ?theme=light for light sites.