Phoenix weather in July
In July, Phoenix has an average high of 42 °C107 °F and an average low of 28 °C83 °F, with about 33 mm1.3 in of precipitation. July is the warmest month of the year and ranks 3rd for precipitation.
How July compares with other months
Compared with June, July is 1.9 °C3.5 °F warmer on average and wetter by 31 mm1.2 in. Compared with August, July is 0.9 °C1.7 °F warmer on average. Daylight lasts about 14.2 hours around the middle of the month. Average relative humidity is 30% and the average cloud amount 43%.
Is July a good time to visit Phoenix?
July is not among the most comfortable months by our comfort score: it is hot (average high 42 °C107 °F). The most comfortable months in Phoenix are November–March.
What to wear in July
For Phoenix in July, pack very light, breathable clothing, a sun hat and plenty of water.
July in nearby places
| Place | High °C°F | Low °C°F | Precip. mmin |
|---|---|---|---|
| Phoenix | 42107 | 2883 | 331.3 |
| Peoria | 42107 | 2882 | 241.0 |
| Mesa | 42107 | 2882 | 331.3 |
| Tucson | 3799 | 2476 | 823.2 |
| Yuma | 42107 | 2780 | 130.5 |
| Nogales | 3392 | 2170 | 1003.9 |
| San Luis Río Colorado | 43110 | 2780 | 70.3 |
| Mexicali | 44112 | 2882 | 60.2 |
| Henderson | 42108 | 2781 | 150.6 |
Nearby places that are more than 1 °C1.8 °F warmer in July: Mexicali; cooler: Tucson and Nogales.
Other months in Phoenix
- January19 °C67 °F / 6 °C42 °F
- February21 °C70 °F / 7 °C44 °F
- March26 °C78 °F / 10 °C50 °F
- April30 °C86 °F / 13 °C56 °F
- May35 °C96 °F / 18 °C65 °F
- June42 °C107 °F / 24 °C76 °F
- July42 °C107 °F / 28 °C83 °F
- August41 °C105 °F / 27 °C81 °F
- September38 °C101 °F / 24 °C75 °F
- October32 °C90 °F / 17 °C63 °F
- November25 °C77 °F / 11 °C51 °F
- December19 °C66 °F / 5 °C42 °F
Frequently asked questions
How warm is Phoenix in July?
In July the average high in Phoenix is 42 °C (107 °F) and the average low is 28 °C (83 °F).
Does it rain a lot in Phoenix in July?
On average about 33 mm (1.3 in) of precipitation falls in July; it ranks 3rd of the 12 months.
Is July the warmest month in Phoenix?
Yes. July is the warmest month in Phoenix. The coldest month is December, with an average low of 5 °C (42 °F).
How long is the day in Phoenix in July?
In the middle of July the day in Phoenix lasts about 14.2 hours from sunrise to sunset. The value is calculated from the position of the city and the sun.
How humid is Phoenix in July?
The average relative humidity in July is about 30%. This is a long-term average for the whole day.
How cloudy is Phoenix in July?
On average about 43% of the sky is covered by cloud in July. This is the mean cloud amount from satellite data, not the number of sunny days.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.
The grid cell’s average elevation is 494 m, while Phoenix lies at about 331 m. Temperatures on this page were therefore adjusted by +1.1 °C1.9 °F using the standard lapse rate of 6.5 °C per 1,000 m.