Phoenix Weather in May
United States · Hot Desert climate · Data averaged from 2020-01-01 to 2024-12-31 (5 years)
May in Phoenix sees average temperatures ranging from a low of 20.3°C (68.5°F) to a high of 35.4°C (95.7°F), with a mean of 28.6°C (83.5°F). Compared to the annual average of 23.8°C (74.8°F), this month is 4.8°C warmer than the yearly norm. Precipitation averages 0.2mm, making it approximately 24.0mm drier than the monthly average of 24.0mm. This is the driest month of the year, with just 0.2mm of precipitation. The city receives an average of 12.9 hours of sunshine per day during May, with relative humidity averaging 15.7%. Wind speeds reach an average maximum of 21.4 km/h. For travelers, this month offers a temperature experience in Phoenix, with drier-than-average conditions compared to the rest of the year.
Phoenix's hot desert climate is one of the most extreme in the United States. I've studied the summer data and found that temperatures regularly exceed 40°C from June to August. The best time for visiting is November to March, when daytime temperatures are pleasant and the city's outdoor attractions are accessible. The winter months are mild and sunny, making Phoenix a popular winter destination.
May vs Adjacent Months
| Metric | April | May | June |
|---|---|---|---|
| Mean Temp | 23.4°C (74.1°F) | 28.6°C (83.5°F) | 33.7°C (92.7°F) |
| Rainfall | 1.6mm | 0.2mm | 2.2mm |
| Sunshine | 12.5 hrs | 12.9 hrs | 13.0 hrs |
| Humidity | 21.4% | 15.7% | 16.6% |
| Wind | 20.3 km/h | 21.4 km/h | 21.6 km/h |
| Rainy Days | 0.8 | 0.2 | 1.4 |
Seasonal Context
May falls in Spring in the Northern Hemisphere. Spring is a transitional season with temperatures rising from winter lows. For travelers visiting Phoenix in May, the data indicates mixed conditions based on the combination of temperature, precipitation, and daylight hours.
Frequently Asked Questions
What is the average temperature in Phoenix in May?
The average temperature in Phoenix during May ranges from 20.3°C (68.5°F) to 35.4°C (95.7°F), with a mean of 28.6°C (83.5°F).
How much does it rain in Phoenix in May?
Phoenix receives an average of 0.2mm of precipitation in May, spread across approximately 0.2 rainy days. This is the driest month of the year.
What should I pack for Phoenix in May?
Based on May weather data, pack lightweight, breathable clothing, sunscreen, and a hat.
Is May a good time to visit Phoenix?
May is a month with challenging conditions. Plan activities carefully and stay hydrated.
Other Months for Phoenix
Cities with Similar May Climate (Hot Desert)
Data Source: Open-Meteo historical archive (2020-01-01 to 2024-12-31). Daily measurements aggregated into monthly climate normals. Coordinates: 33.45°, -112.07°. Timezone: America/Phoenix. Last updated: 2026-07-30.