Phoenix weather in August
Temperature, rain and sunshine in August: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in August
Fair
Best time to visit: November – April
What is the weather like in Phoenix in August?
In August, Phoenix is very hot: daytime highs average 40 °C, and even at night it stays warm at around 28 °C. With around 10 hours of sunshine a day, there is plenty of sun. Rain is rare: about 4 days bring 22 mm in total. On about 31 days the thermometer climbs to 30 °C or more. All in all, August is a so-so month for a holiday in Phoenix.
August compared
How the weather changes from July to September. Tap a month to open it.
| JulyJul | AugustAug | SeptemberSep | |
|---|---|---|---|
| Score | 50 | 50 | 50 |
| Day | 41° | 40° | 37° |
| Night | 29° | 28° | 24° |
| Sun | 10 h | 10 h | 9 h |
| Rain days | 3 | 4 | 3 |
More details for August
- Daylight
- 13 h 26 min05:50 – 19:16
- UV index
- 10 · very highclear sky, noon (estimate)All months
- Muggy days
- 6 daysdew point 18 °C or moreAll months
- Wind
- 14 km/haverage daily peakAll months
- Cloud cover
- 34 %on averageAll months
- Hot days
- 31 days30 °C or moreAll months
- Time zone
- UTC−7America/Phoenix
How the score comes together
- Temperatureweight 50 %0 %
- Sunshineweight 20 %100 %
- Few rainy daysweight 30 %100 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in August
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Water bottle – drink plenty
Phoenix in August: quick answers
Is Phoenix hot in August?
Yes. In August, Phoenix is very hot: daytime highs average 40 °C and nights stay around 28 °C. On about 31 days the thermometer climbs to 30 °C or more.
Does it rain much in Phoenix in August?
Rain is rare: about 4 days bring 22 mm in total.
Phoenix month by month
The whole year in PhoenixAll destinations: USAWhere to go in August
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences