Phoenix Weather in August

What's the weather like in Phoenix (Arizona) in August 2025?

The climate in Phoenix during August can be summarized as very hot and dry.

August is in the summer in Phoenix and is typically the 2nd warmest month of the year. Daytime maximum temperatures average around a hot 40°C (104°F), whilst at night 25°C (78°F) is normal.

Phoenix weather averages (imperial / metric)
Daytime temperature 40°C 103.9°F
Nightly temperature 25.3°C 77.5°F
Average temperature 32.6°C 90.7°F
Daily sunshine 12.4 hrs
Avg rainfall 29 mm 1.2 ins
Rainy days 5 days
Sea temperature 22.2°C 71.9°F
Humidity 37%
Windspeed 13kph 8 mph

On average August is the wettest month of the year in Phoenix with around 29mm 1.2 inches of rain making it a dry time to visit. This rainfall is typically spread over 5 days, although this may vary considerably.

On the flip side this corresponds to an average of 12.4 hours of sunshine per day.

August temperatures in Phoenix

Phoenix average temperature in August

August rainfall

Phoenix average rain in August

August hourly sunshine

Phoenix average rain in August

The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Phoenix in August 2025.

Other monthly averages

Best places to visit in August

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

Phoenix weather stats

Phoenix weather statistics
Hottest month: July 40.9°C 105.6°F
Driest month: June 2mm 0.1ins
Sunniest month: June 14.5hrs
Coldest month: January 18.7°C 65.7°F
Wettest month: August 29mm 1.1ins
Map showing location of Phoenix (33.44838, -112.07404) Phoenix map pin © Google

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