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March Weather in Phoenix, United States

Last updated: June 24, 2025

In March, the average temperature in Phoenix, United States hovers around 5°C (42°F). During this time, you can expect a minimum temperature of -8°C (18°F) and a maximum of 21°C (70°F). With 119 mm (4.7 in) of precipitation spread over 16 days, the air feels quite humid, with an average humidity of 86%. Prepare for a mix of chilly winds and occasional warmth!

March Temperature in Phoenix

In March in Phoenix, the average temperature is 5°C (42°F), with maximums reaching up to 21°C (70°F) and minimums plummeting as low as -8°C (18°F). It’s advisable to pack layers to prepare for the temperature fluctuations you may encounter while traveling.

March Weather in Phoenix: Daily Temperature Highs, Lows, and Averages

The chart illustrates March temperature patterns in Phoenix, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Phoenix, March typically has an average temperature of 5°C (42°F), with highs reaching up to 21°C (70°F) and lows dropping to around -8°C (18°F).
JanFebMarAprMayJunJulAugSepOctNovDec383742475462696961504237
Data source: Temperature data for Phoenix generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

March Precipitation in Phoenix

In Phoenix in March, the total precipitation amount reaches 119 mm (4.7 in) over the course of 16 days.

March Precipitation Trends in Phoenix

The chart displays monthly precipitation patterns in Phoenix, with values for each month alongside March’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how March’s conditions compare to those of other months. In Phoenix, March typically receives around 119 mm (4.7 inches) of precipitation spread over approximately 16 days.
JanFebMarAprMayJunJulAugSepOctNovDec12613611996673249445194106
Data source: Precipitation data for March generated using information from the Copernicus Climate Change Service.
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March Humidity in Phoenix

In Phoenix in March, humidity is 86%. With an average temperature of 5°C (42°F), this humidity feels like a damp chill that penetrates your layers, making outdoor activities quite uncomfortable and prompting you to seek warmth indoors more often.

March Average Humidity in Phoenix

This chart illustrates the average monthly humidity levels in Phoenix, with March’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In March, average humidity in Phoenix is approximately 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%85%86%83%83%83%78%67%66%77%87%87%
Data source: Humidity data for March generated using information from the Copernicus Climate Change Service.

March UV Index in Phoenix

In Phoenix in March, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Phoenix.

Maximum UV Index Levels in Phoenix for March

The chart shows the monthly maximum UV Index (UVI) for Phoenix in March, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In March, the maximum UV index in Phoenix typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3478111110108642
Data source: Phoenix March UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How March Weather in Phoenix Compares to Other Months

Weather in Phoenix varies notably across the year, with each month offering distinct climate conditions. This page compares March’s weather to other months in Phoenix, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Phoenix, showing how March’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather3°C (38°F)125 mm (4.9 inches)84%moderate
February Weather3°C (38°F)136 mm (5.4 inches)85%moderate
March Weather5°C (42°F)119 mm (4.7 inches)86%high
April Weather8°C (47°F)96 mm (3.8 inches)83%very high
May Weather12°C (54°F)67 mm (2.6 inches)83%extreme
June Weather17°C (62°F)32 mm (1.3 inches)83%extreme
July Weather21°C (70°F)4 mm (0.2 inches)78%very high
August Weather20°C (69°F)9 mm (0.4 inches)67%very high
September Weather16°C (61°F)44 mm (1.7 inches)66%very high
October Weather10°C (51°F)51 mm (2.0 inches)77%high
November Weather6°C (43°F)94 mm (3.7 inches)87%moderate
December Weather3°C (37°F)106 mm (4.2 inches)87%low

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