March weather forecast and climate
Phoenix, AZ

The city of Phoenix, Arizona at dusk
The city of Phoenix, Arizona at dusk
There is a sharp drop in humidity in March to 29%, and with it comes more sunshine hours across the day of up to eleven. More extended sunshine makes the temperatures even hotter ranging between 46.4°F (8°C) and 75.2°F (24°C).
That creates a perfect time to visit the beaches and bask away in the sun. Even better, expect a few showers of rain, averaging 1" (25.4mm) in March, in the afternoons to help cool the sun's heat.
Average temperature in March - Phoenix, AZ
  • Average high temperature in March: 24.9°C

The warmest month (with the highest average high temperature) is July (41.2°C).
The month with the lowest average high temperature is December (18.9°C).

  • Average low temperature in March: 11.9°C

The month with the highest average low temperature is July (28.6°C).
The coldest month (with the lowest average low temperature) is December (7.1°C).

Average humidity in March - Phoenix, AZ
  • Average humidity in March: 39.3%

The month with the highest relative humidity is December (51.8%).
The month with the lowest relative humidity is June (19.4%).

Average rainfall in March - Phoenix, AZ
  • Average rainfall in March: 25.1mm

The wettest month (with the highest rainfall) is July (26.7mm).
The driest month (with the lowest rainfall) is June (0.5mm).

Average rainfall days in March - Phoenix, AZ
  • Average rainfall days in March: 3.9 days

The month with the highest number of rainy days is August (5 days).
The month with the lowest number of rainy days is June (0.5 days).

Average daylight in March / Average sunshine in March - Phoenix, AZ
  • Average daylight in March: 12h

The month with the longest days is June (Average daylight: 14.3h).
The month with shortest days is December (Average daylight: 10h).

  • Average sunshine in March: 10.3h

The month with most sunshine is June (Average sunshine: 13.6h).
The month with least sunshine is December (Average sunshine: 7.9h).

Average UV index in March - Phoenix, AZ
  • Average UV index in March: 6

The month with the highest UV index is July (UV index 11).
Months with the lowest UV index are January and December (UV index 3).

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