Phoenix weather in May
In May, Phoenix has an average high of 35 °C96 °F and an average low of 18 °C65 °F, with about 6 mm0.2 in of precipitation. It is the 5th warmest month of the year and ranks 11th for precipitation.
How May compares with other months
Compared with April, May is 5.3 °C9.6 °F warmer on average. Compared with June, May is 6 °C10.9 °F cooler on average. Daylight lasts about 13.9 hours around the middle of the month. Average relative humidity is 22% and the average cloud amount 22%.
Is May a good time to visit Phoenix?
May is not among the most comfortable months by our comfort score: it is hot (average high 35 °C96 °F). The most comfortable months in Phoenix are November–March.
What to wear in May
For Phoenix in May, pack very light, breathable clothing, a sun hat and plenty of water.
May in nearby places
| Place | High °C°F | Low °C°F | Precip. mmin |
|---|---|---|---|
| Phoenix | 3596 | 1865 | 60.2 |
| Peoria | 3595 | 1865 | 30.1 |
| Mesa | 3595 | 1865 | 60.2 |
| Tucson | 3492 | 1661 | 40.2 |
| Yuma | 3595 | 1763 | 20.1 |
| Nogales | 3087 | 1355 | 40.1 |
| San Luis Río Colorado | 3697 | 1762 | 20.1 |
| Mexicali | 3697 | 1864 | 30.1 |
| Henderson | 3392 | 1762 | 40.1 |
Nearby places that are more than 1 °C1.8 °F cooler: Tucson, Nogales and Henderson.
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 May?
In May the average high in Phoenix is 35 °C (96 °F) and the average low is 18 °C (65 °F).
Does it rain a lot in Phoenix in May?
On average about 6 mm (0.2 in) of precipitation falls in May; it ranks 11th of the 12 months.
Is May the warmest month in Phoenix?
No. The warmest month in Phoenix is July, with an average high of 42 °C (107 °F). The coldest month is December, with an average low of 5 °C (42 °F).
How long is the day in Phoenix in May?
In the middle of May the day in Phoenix lasts about 13.9 hours from sunrise to sunset. The value is calculated from the position of the city and the sun.
How humid is Phoenix in May?
The average relative humidity in May is about 22%. This is a long-term average for the whole day.
How cloudy is Phoenix in May?
On average about 22% of the sky is covered by cloud in May. 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.