When to Visit Tucson

Expect 19°C (66°F) afternoons and 4°C (40°F) dawns - good for cycling the 131-mile Loop path, but you'll share the trail with snowbirds. Crowds are medium. Overnight frost on windshields is common. Rainfall is a forgettable 20 mm (0.8 in).

Much like January, just a touch warmer (20°C / 69°F). Desert wildflowers can start as early as the third week if winter rain cooperated. Hummingbirds return; crowd level still medium.

The city's outdoor season kicks in: 24°C (75°F) days, 9°C (48°F) nights, and almost guaranteed sun. Gem & Mineral Show stragglers keep hotel prices high early in the month - crowds medium-high.

28°C (82°F) afternoons, zero humidity, endless blue sky. Saguaro National Park blooms. But pollen counts soar. Pack antihistamines. With college kids gone, crowds ease back to medium.

First true taste of blast-furnace heat: 33°C (91°F) by day, 16°C (61°F) at night. Hotel pools become social centres. Room rates still reasonable. Crowd level low outside Memorial Day weekend.

The hottest month - 39°C (102°F) is routine, 22°C (71°F) at midnight. Locals flee to Mount Lemmon or San Diego. Visitor numbers drop to yearly lows. Afternoon thunderstorms are rare before mid-month.

Still 38°C (100°F) but now add 2-3 inches of rain, usually in 30-minute evening bursts. Lightning photography on Gates Pass is spectacular. Crowds inch up as families hunt budget summer trips.

Slightly cooler (37°C / 98°F) and just as wet. Humidity peaks; flash-flood warnings are daily talk-radio fodder. Hotel deals evaporate. Crowd level medium.

Heat backs off to 35°C (95°F) and rain tapers, making late-month hiking in Sabino Canyon sublime. University of Arizona students return - restaurants on University Boulevard buzz. Crowds medium-high.

The sweet spot: 30°C (86°F) days, 15°C (59°F) nights, virtually no rain. Cyclists love El Tour de Tucson training weather. Hotel prices rise; crowds medium.

24°C (75°F) afternoons feel like May in most of the U.S. Day-of-the-Dead processions downtown and the Tucson Arts & Crafts Fair keep things lively. Crowds medium.

Back to 18°C (65°F) highs, 4°C (40°F) lows. Snow dusts the Rincons most winters, giving you cactus-and-snow postcards. Winter Texans arrive. Holiday weekends push crowds to medium-high.