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May Weather in San Tan Valley, United States

Last updated: June 24, 2025

In May, the average temperature in San Tan Valley, United States is a warm 27°C (80°F). Expect a range of temperatures, from a cool 12°C (53°F) to a scorching 42°C (108°F). With just 3 mm (0.1 in) of precipitation over 0 days, the weather is typically dry, and the average humidity hovers around a comfortable 40%.

May Temperature in San Tan Valley

In May in San Tan Valley, the average temperature is 27°C (80°F), with maximums potentially soaring to 42°C (108°F) and minimums dropping as low as 12°C (53°F). This makes it essential for travelers to prepare for both warm days and cooler evenings.

May Weather in San Tan Valley: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in San Tan Valley, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Tan Valley, May typically has an average temperature of 27°C (80°F), with highs reaching up to 42°C (108°F) and lows dropping to around 12°C (53°F).
JanFebMarAprMayJunJulAugSepOctNovDec545663738091939287756554
Data source: Temperature data for San Tan Valley 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.

May Precipitation in San Tan Valley

In San Tan Valley in May, the precipitation amount is 3 mm (0.1 in) during a total of 0 days.

May Precipitation Trends in San Tan Valley

The chart displays monthly precipitation patterns in San Tan Valley, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In San Tan Valley, May typically receives around 3 mm (0.1 inches) of precipitation spread over approximately 0 days.
JanFebMarAprMayJunJulAugSepOctNovDec334225233453429202130
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in San Tan Valley

In San Tan Valley in May, humidity is 40%. With an average temperature of 27°C (80°F), this humidity feels like a comfortable embrace, making it ideal for leisurely strolls and exploring the local attractions without feeling overly sticky or weighed down by heat.

May Average Humidity in San Tan Valley

This chart illustrates the average monthly humidity levels in San Tan Valley, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, average humidity in San Tan Valley is approximately 40%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%79%67%55%40%33%34%48%64%67%77%82%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in San Tan Valley

In San Tan Valley in May, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in San Tan Valley.

Maximum UV Index Levels in San Tan Valley for May

The chart shows the monthly maximum UV Index (UVI) for San Tan Valley in May, 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 May, the maximum UV index in San Tan Valley typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec469111112111110854
Data source: San Tan Valley May 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 May Weather in San Tan Valley Compares to Other Months

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

This table compares monthly weather conditions in San Tan Valley, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather12°C (54°F)33 mm (1.3 inches)76%moderate
February Weather13°C (56°F)42 mm (1.7 inches)79%high
March Weather17°C (64°F)25 mm (1.0 inches)67%very high
April Weather23°C (73°F)2 mm (0.1 inches)55%extreme
May Weather27°C (80°F)3 mm (0.1 inches)40%extreme
June Weather33°C (91°F)3 mm (0.1 inches)33%extreme
July Weather34°C (93°F)45 mm (1.8 inches)34%extreme
August Weather33°C (92°F)34 mm (1.4 inches)48%extreme
September Weather30°C (87°F)29 mm (1.2 inches)64%very high
October Weather24°C (75°F)20 mm (0.8 inches)67%very high
November Weather18°C (65°F)21 mm (0.8 inches)77%moderate
December Weather12°C (55°F)30 mm (1.2 inches)82%moderate

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