Phoenix Weather in August
August in Phoenix sees daytime temperatures around 40°C (104°F) and lows of 28°C (82°F) at night. As the wettest month of the year, keep in mind that rainfall is at its highest.
Rainfall in Phoenix in August
Prepare for the wettest month with an umbrella to protect yourself from frequent rain. Historically, August sees about 6 days of rain, with a monthly average of 32 mm (1.3 in). The occasional light shower is possible, but rain is rarely an issue this month.
Temperature in Phoenix in August
If you're visiting Phoenix in August, expect highs of 40°C (104°F) and overnight lows around 28°C (82°F). Sunshine and humidity can make it feel even warmer than the raw temperature suggests. At 28°C (82°F) overnight, the heat doesn't let up much after dark. If you're staying somewhere without air conditioning, a cold shower before bed and keeping the air moving can help.
Sunshine in Phoenix in August
The days are predominantly sunny, with an estimated total of around 360 hours of sunshine. These sun-filled days are perfect for playing sports, visiting parks, or going for a bike ride.Our weather planner can help you find worldwide destinations with pleasant weather during this period. January, February, March, November and December typically offer the best weather for Phoenix.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Phoenix's climate page.
Phoenix Temperature in August
Min Temperature
28°C (82°F)
Max Temperature
40°C (104°F)
Chance of Rain
20%
Precipitation
32 mm (1.3 in)
Rainy days
6 days
Humidity
36%
Sunshine
360 hours
Percentage Sunshine
87%
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Phoenix typically stay consistent throughout August, with daily highs averaging around 40°C (104°F). Nights are warm, with lows typically ranging from 28°C (82°F) to 30°C (86°F).
Average temperatures in August
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in August
Historical weather for Phoenix in August
Browse day-by-day weather records for Phoenix spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Phoenix historical weather extremes in August
Our historical data for Phoenix spans 1976 to 2025, revealing these weather extremes.
- On August 7, 2025, temperatures climbed to 48°C (118°F), marking the warmest August day on record.
- On August 23, 1992, Phoenix saw its coldest August day with temperatures maxing out at 25°C (77°F).
- The coldest night in August in Phoenix was on August 28, 2008, with a minimum of 19°C (66°F).
Best Places in the United States of America in August
Find out more about the weather in the United States of America and which places have the best travel conditions in this month. See all of the United States of America in August →
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What to Wear in Phoenix in August
Pack for serious heat in Phoenix in August. Prioritize clothing that breathes and doesn't cling or stick. Lightweight cotton, linen, and moisture-wicking fabrics are ideal. A wide hat provides welcome shade. Light rain is possible, so consider bringing a small umbrella or rain jacket. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.What To Do in Phoenix in August
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Phoenix's climate page.
Temperature Rainfall Sunshine Humidity
See the full Phoenix climate overview or explore weather in the United States of America.
