May on the Arizona Trail is mostly dry and sunny, with heat in the low deserts and much cooler conditions at higher elevations. Clear spells are punctuated by brief showers and a few heavier pulses over mountains and the high plateau. Daytime highs range from 16–39°C, while nights run from -1–22°C. Cloud cover flips between clear and overcast on some days, but rainfall is usually brief and localized.
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From the border through the rolling foothills, most days are clear to mainly clear with occasional overcast spells and virtually no rain. Highs run 24–34°C, with a few cooler days 14–23°C, and nights 1–19°C. Skies brighten northward, where warmth peaks and conditions stay dry.
Approaching the desert valleys, brief showers pop up, with isolated 1–2 mm and local bursts near 5 mm. Between showers, sunshine is common and temperatures spike, with highs often 23–36°C and nights 9–21°C. Cloud cover flips between overcast bursts and clear skies.
Climbing into the mountains, a disturbance brings several showery days, including a wet burst around 18 mm at high elevation. Highs swing 12–30°C, with cool nights 1–15°C. Clear breaks follow the rain but clouds linger at times.
Across the uplands, sun dominates with only spotty drizzle until a sharper storm drops about 17 mm on one day. Highs reach 26–35°C, with warm nights 12–21°C. Cloud cover varies from clear to overcast around the change.
Farther north, heat surges in the low country to around 39°C before scattered showers return. Rainfall ranges from a few tenths to about 12 mm near river corridors, with additional 1–5 mm in nearby foothills. Highs vary 17–39°C, and nights 6–25°C. Skies alternate between overcast pulses and bright sun.
Into the transition zone, days are warm with intermittent light to moderate drizzle totaling 1–6 mm. Highs generally sit 22–34°C, with cooler pockets, and nights 6–22°C. Sunshine returns quickly between showers.
A notably wetter stretch follows, with widespread showers and periods of steady rain delivering about 2–21 mm. Cloudier skies keep highs 17–33°C, and nights 1–17°C. Clear windows still appear between bands of rain.
Conditions dry out again along canyons and the rim, though a quick cold snap brings about 3 mm of precipitation and much cooler daytime readings. Highs range 18–36°C across this leg, with nights 7–18°C. Skies shift from clear to overcast and back.
Scattered light showers continue with totals near 1–4 mm, mixed with long sunny spells. Highs hover 17–26°C, and nights 3–13°C. Overcast mornings often yield to clearer afternoons.
Over the plateau forests, a few showers develop, including local bursts around 3–5 mm. Highs vary 17–29°C with cool nights 5–13°C. Skies toggle between overcast and clear.
Mostly dry weather returns, interrupted by brief drizzles up to about 4 mm. Afternoons warm to 23–32°C, and nights sit 7–19°C. Sunshine dominates despite occasional overcast.
Approaching the canyon, isolated showers of 1–4 mm dot the route amid frequent sun. Highs span 16–33°C with cool nights 3–16°C. Cloud cover alternates between overcast and clear.
Across the far north, most days are dry with a few light pulses of 0–4 mm, and one day drops to about -1°C at dawn. Highs climb 6–37°C depending on elevation, and nights 0–22°C. Skies range from clear to overcast but lean sunny at the end.
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