When Can I Be Outside?
Hour-by-hour windows for hiking and being outdoors in the Sedona heat, on the published NWS scale — in plain words.
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Hour-by-hour windows for hiking and being outdoors in the Sedona heat, on the published NWS scale — in plain words.
In summer the red rocks bake. Most days the question on a Sedona trail isn't whether it gets hot — it's which hours are safe to be out on the exposed slickrock. This reads the hourly heat forecast and names the easier windows, so you can be back before the worst of it.
Best windows today: before 9 am, and after 2 pm.
As of 15 June at 0:37. Modelled forecast for the area around central Sedona, refreshed about every half hour.
UV peaks near 9 today. On the EPA’s UV index scale, 1–2 is low; 8 and above is very high to extreme and calls for extra sun protection.
| Day | Best windows | Peak feels-like | Peak air |
|---|---|---|---|
| Tuesday 16 June | before 9 am, and after 8 pm | 95°F | 48 · Good |
| Wednesday 17 June | before 10 am, and after 7 pm | 91°F | 48 · Good |
Guidance, not a medical call
Heat uses the National Weather Service’s heat-index categories, applied to the modelled feels-like temperature: Caution 80°F–90°F, Extreme Caution 90°F–103°F, Danger 103°F–124°F, Extreme Danger 125°F and up.
Air uses the US EPA air quality index: Good 0–50, Moderate 51–100, Unhealthy for Sensitive Groups 101–150, Unhealthy 151–200, Very Unhealthy 201–300, Hazardous above that. The number here is that same EPA index, computed by Open-Meteo from the Copernicus CAMS model.
Each hour takes the harder of the two constraints, and the strip says which one. A “best window” means hours where the feels-like temperature stays below 80°F (below the NWS Caution band) and the air is no worse than Moderate — the EPA’s general-population activity cautions start at 101. No thresholds on this page are ours.
Cathedral Rock, Devil's Bridge, Bell Rock and the Airport Mesa loop are open slickrock with almost no shade — they feel hotter than this page's town number, and there's no water on them. The Oak Creek corridor trails (West Fork, the creekside stretches) run noticeably cooler and shadier. On a hot day, save the mesas for the early window and keep the canyon for midday.
From June through August, the comfortable window is usually the first hours after sunrise. Aim to be parked and walking by 6:30–7 a.m.; trailhead lots also fill early, so the early start solves two problems at once. Carry more water than you think you need — a gallon per person on a long exposed hike.
From July the afternoons can turn from clear to thunderstorm fast. An early finish keeps you off exposed high ground (and out of slot canyons and washes) when lightning and flash-flood runoff arrive — check the creek-flood page too on stormy days.
Sedona sits at 4,360 feet, so it's cooler than Phoenix — but July still averages a high near 97°F, and the slickrock radiates heat well past it. On the genuinely extreme days no hour is easy, and this page will say so rather than pretend.
Source: NWS Flagstaff, checked 2026-06-15
Fetched 15 June at 0:37. These are modelled estimates for the area around central Sedona, not measurements — a shadeless trail at 3 pm runs hotter than the area-wide number. Weather and air-quality data by Open-Meteo (CC BY 4.0); air quality based on Copernicus CAMS. Heat categories from the National Weather Service; air bands from the US EPA.