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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Reading Wire weather desk. Data from national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
Phoenix weather is defined by extreme summer heat, with daily highs often exceeding 40°C from June through September, making it one of the hottest major cities in the United States. The live forecast above shows today’s conditions.
What makes Phoenix weather so extreme?
Phoenix sits in the Sonoran Desert, which gives it a hot desert climate with very low humidity and intense sunshine. Summer highs regularly hit 43°C, and overnight lows can stay above 30°C, offering little relief. Winters are mild and pleasant, with daytime temperatures around 20°C, while rainfall is scarce—most of the annual 200mm falls during the brief monsoon season from July to September.
What should you know before visiting Phoenix?
If you’re planning a trip, the best time to visit is between November and March, when temperatures are comfortable for outdoor activities. In summer, you’ll need to stay hydrated, wear sunscreen, and avoid being outside during the peak heat of the afternoon. Flash flooding can occur during monsoon storms, so check local warnings. For comparison, you can see how this contrasts with UK weather or the milder conditions in Bristol Weather.
Does Phoenix ever get cold?
Yes, winter nights can drop to around 7°C, and frost is possible a few times a year. However, daytime temperatures remain mild, so it rarely feels truly cold for long.
What is the monsoon season in Phoenix?
Monsoon season runs from mid-June to September, bringing brief but intense thunderstorms, dust storms (haboobs), and the risk of flash flooding. Humidity rises noticeably during this period.
Is Phoenix humidity low?
Most of the year, yes. Humidity averages below 30% in summer, which makes the heat feel slightly more bearable, but it also leads to rapid dehydration. Monsoon months are the exception, with humidity spiking temporarily.