Weather Averages in Phoenix

Here is a quick breakdown of the Valley of the Sun’s weather and climate. Phoenix has a hot desert climate (Köppen climate classification BWh), typical of the Sonoran Desert. Phoenix has long, extremely hot summers and short, mild to warm winters. The city is located within the sunniest region in the world. Measuring 3,872 hours of bright sunshine annually, Phoenix receives the most sunshine of any major city on Earth. Average high temperatures in summer are the hottest of any major city in the United States. On average, there are 107 days annually with a high of at least 100 °F (38 °C) including most days from late May through early October. Highs top 110 °F (43 °C) an average of 18 days during the year. On June 26, 1990, the temperature reached an all-time recorded high of 122 °F (50 °C). Despite the city’s claim to the most extreme heat in summer, however, it does not have the highest average annual temperature in the contiguous United States. In that respect, it comes second to Miami; Phoenix has an average daily temperature of 75 °F (24 °C), compared to Miami’s 77 °F (25 °C).

As for monthly averages and a combined annual average, here is a quick breakdown. All temperatures in Fahrenheit are not in parentheses, while Celsius temperature measurements are.

In January, average high temperatures are 67.2 (19.6) degrees with a maximum average high temperature of 78.7 (25.9) degrees, while average low temperatures are 45.6 (7.6) degrees, with a maximum average low temperature of 36.2 (2.3) degrees. Average temperatures in between being 56.4 (13.6) degrees.

In February, average high temperatures are 70.7 (21.5) degrees with a maximum average high temperature of 82.8 (28.2) degrees, while average low temperatures are 48.7 (9.3) degrees, with a maximum average low temperature of 39.4 (4.1) degrees. Average temperatures in between being 59.7 (15.4) degrees.

In March, average high temperatures are 76.9 (24.9) degrees with a maximum average high temperature of 90.0 (32.2) degrees, while average low temperatures are 53.5 (11.9) degrees, with a maximum average low temperature of 43.2 (6.2) degrees. Average temperatures in between being 65.2 (18.4) degrees.

In April, average high temperatures are 85.2 (29.6) degrees with a maximum average high temperature of 98.6 (37) degrees, while average low temperatures are 60.2 (15.7) degrees, with a maximum average low temperature of 49.5 (9.7) degrees. Average temperatures in between being 72.7 (22.6) degrees.

In May, average high temperatures are 94.8 (34.9) degrees with a maximum average high temperature of 105.9 (41.1) degrees, while average low temperatures are 69.4 (20.8) degrees, with a maximum average low temperature of 58.0 (14.4) degrees. Average temperatures in between being 82.1 (27.8) degrees.

In June, average high temperatures are 103.9 (39.9) degrees with a maximum average high temperature of 112.5 (44.7) degrees, while average low temperatures are 77.7 (25.4) degrees, with a maximum average low temperature of 68.4 (20.2) degrees. Average temperatures in between being 90.8 (32.7) degrees.

In July, average high temperatures are 106.1 (41.2) degrees with a maximum average high temperature of 114.4 (45.8) degrees, while average low temperatures are 83.5 (28.6) degrees, with a maximum average low temperature of 73.7 (23.2) degrees. Average temperatures in between being 94.8 (34.9) degrees.

In August, average high temperatures are 104.4 (40.2) degrees with a maximum average high temperature of 112.5 (44.7) degrees, while average low temperatures are 82.7 (28.2) degrees, with a maximum average low temperature of 73.7 (23.2) degrees. Average temperatures in between being 93.6 (34.2) degrees.

In September, average high temperatures are 99.8 (37.7) degrees with a maximum average high temperature of 108.6 (42.6) degrees, while average low temperatures are 76.9 (24.9) degrees, with a maximum average low temperature of 67.1 (19.5) degrees. Average temperatures in between being 88.4 (31.3) degrees.

In October, average high temperatures are 88.5 (31.4) degrees with a maximum average high temperature of 100.1 (37.8) degrees, while average low temperatures are 64.8 (18.2) degrees, with a maximum average low temperature of 53.6 (12) degrees. Average temperatures in between being 76.7 (24.8) degrees.

In November, average high temperatures are 75.5 (24.2) degrees with a maximum average high temperature of 88.1 (31.2) degrees, while average low temperatures are 52.7 (11.5) degrees, with a maximum average low temperature of 40.8 (4.9) degrees. Average temperatures in between being 64.1 (17.8) degrees.

In December, average high temperatures are 66.0 (18.9) degrees with a maximum average high temperature of 77.1 (25.1) degrees, while average low temperatures are 44.8 (7.1) degrees, with a maximum average low temperature of 34.6 (1.4) degrees. Average temperatures in between being 55.4 (13) degrees.

Across the year, all these combined, average high temperatures are 86.6 (30.3) degrees with a maximum average high temperature of 115.2 (46.2) degrees, while average low temperatures are 63.4 (17.4) degrees, with a maximum average low temperature of 33.5 (0.8) degrees. Average temperatures in between being 75.1 (23.9) degrees.

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