With its arid climate Phoenix has been ranked the hottest city in the United States, and one of the hottest in the world. The temperature in Phoenix registers at least 100°F (38°C) or more on an average of 90 days out of the year, mostly between June and September. Most days are sunny, and rainfall is scarce, although there are thunderstorms sometimes during July and September caused by humid air blowing in from the Gulf of California. Winters bring mild, sunny days, with occasional fog. Snow is rare, but has been recorded, but frost is frequent in winter months.

Phoenix is spread out, and distances between places of interest to visitors tend to be significant; therefore, outside of the downtown area, a rental car is a must. However, the construction of the METRO light rail, expected to be completed in 2008, may help shorten these gaps a bit. In the meantime, keep in mind that local drivers often speed and tailgate. At present, the city's public transport system is geared more towards commuters rather than tourists, although the free central city shuttle bus service, called DASH (Downtown Area Shuttle), is useful for accessing attractions like the state capitol and major shopping malls. The buses run on weekdays between 6.30am and 5.30pm. The city's bus service is called Valley Metro, and schedules are available from the Central Station and Frys supermarkets. Taxis are freely available from local companies but tend to be expensive and are not recommended for getting around, unless for a short trip within a limited area.

English is the most common language but Spanish is often spoken in south-western states.

The US Dollar (USD) is the unit of currency and is divided into 100 cents. Only major banks exchange foreign currency. ATMs are widespread and credit cards and travellers cheques are widely accepted. Travellers cheques should be taken in US Dollars to avoid hassles. Banking hours are Monday to Friday 9am to 3pm.