May Weather in Fountain Hills, United States

Last updated: June 24, 2025

In May, the average temperature in Fountain Hills, United States reaches a warm 27°C (81°F), with lows dipping to 12°C (54°F) and highs soaring to a scorching 42°C (108°F). This month sees minimal precipitation, with just 2 mm (0.1 in) over 0 days, contributing to an average humidity level of 40%. Perfect weather for outdoor adventures!

May Temperature in Fountain Hills

In May in Fountain Hills, the average temperature is 27°C (81°F). The maximum can reach 42°C (108°F), and the minimum can be as low as 12°C (54°F). Therefore, travelers should be prepared for a wide range of temperatures, making it essential to pack both light clothing for the heat and warmer layers for cooler evenings.

May Weather in Fountain Hills: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Fountain Hills, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Fountain Hills, May typically has an average temperature of 27°C (81°F), with highs reaching up to 42°C (108°F) and lows dropping to around 12°C (54°F).

Data source: Temperature data for Fountain Hills generated using information from the Copernicus Climate Change Service.

May Precipitation in Fountain Hills

In Fountain Hills in May, the precipitation amount is 2 mm (0.1 in) during a span of 0 days.

May Precipitation Trends in Fountain Hills

The chart displays monthly precipitation patterns in Fountain Hills, 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 Fountain Hills, May typically receives around 2 mm (0.1 inches) of precipitation spread over approximately 0 days.

Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

May Humidity in Fountain Hills

In Fountain Hills in May humidity is 40%. With an average temperature of 27°C (81°F), this humidity feels like a pleasant breeze, making it comfortable for exploring the outdoors and enjoying various activities without feeling overly sticky or drenched in sweat.

May Average Humidity in Fountain Hills

This chart illustrates the average monthly humidity levels in Fountain Hills, 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 Fountain Hills is approximately 40%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Fountain Hills

In Fountain Hills 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 Fountain Hills.

Maximum UV Index Levels in Fountain Hills for May

The chart shows the monthly maximum UV Index (UVI) for Fountain Hills 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 Fountain Hills typically reaches 11, which falls under the extreme exposure category.

Data source: Fountain Hills 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 Fountain Hills Compares to Other Months

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

This table compares monthly weather conditions in Fountain Hills, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	12°C (53°F)	33 mm (1.3 inches)	76%	moderate
February Weather	13°C (56°F)	44 mm (1.7 inches)	79%	high
March Weather	17°C (63°F)	31 mm (1.2 inches)	67%	very high
April Weather	23°C (74°F)	2 mm (0.1 inches)	55%	very high
May Weather	27°C (81°F)	2 mm (0.1 inches)	40%	extreme
June Weather	33°C (92°F)	2 mm (0.1 inches)	33%	extreme
July Weather	34°C (94°F)	38 mm (1.5 inches)	34%	extreme
August Weather	34°C (93°F)	33 mm (1.3 inches)	48%	extreme
September Weather	31°C (88°F)	28 mm (1.1 inches)	64%	very high
October Weather	24°C (75°F)	25 mm (1.0 inches)	67%	very high
November Weather	18°C (65°F)	23 mm (0.9 inches)	77%	moderate
December Weather	12°C (54°F)	27 mm (1.0 inches)	82%	moderate