May weather forecastFountain Hills, AZ
May
Weather in May
May embodies the brisk transition from spring towards summer in Fountain Hills, depicting a noticeable shift from April. The escalation in temperatures advances rapidly throughout this month. Simultaneously, the weather retains its predominant aridity, further reducing humidity and rainfall levels. Longer daylight durations accompanied by a reduced cloud cover optimises the penetration of sunlight. A marked rise in temperatures from 63.1°F (17.3°C) to 86.7°F (30.4°C) underlines the atmospheric shift towards the heated summer months.Temperature
The onset of May in Fountain Hills introduces a subtle rise in the average high-temperature, nudging from a moderately hot 79.3°F (26.3°C) in April to a hot 86.7°F (30.4°C). Fountain Hills's nighttime average of 63.1°F (17.3°C) during May reflects a substantial decrease from the daytime temperature.Humidity
In May, the average relative humidity in Fountain Hills is 21%.Rainfall
The months with the least rainfall in Fountain Hills are May and June Rain falls for 2.7 days and accumulates 0.12" (3mm) of rain.Daylight
In May, the average length of the day is 13h and 55min.On the first day of May in Fountain Hills, sunrise is at 5:37 am and sunset at 7:10 pm. On the last day of the month, sunrise is at 5:17 am and sunset at 7:31 pm MST.
Sunshine
In May, the average sunshine in Fountain Hills is 11.9h.UV index
The average daily maximum UV index in May is 7. A UV Index reading of 6 to 7 represents a high health vulnerability from unprotected exposure to Sun's UV rays for average individuals.Note: A maximum daily UV index of 7 during May morphs into the following directions:
Act on precautions and pay attention to sun safety recommendations. Avoidance of sunburn is obligatory. Limit your exposure to the sun's UV radiation, which is strongest between 10 a.m. and 4 p.m., and note that parasols or canopies may not provide full sun protection. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Fountain Hills, AZ
- Average high temperature in May: 86.7°F
The warmest month (with the highest average high temperature) is July (99.1°F).
The month with the lowest average high temperature is December (60.3°F).
- Average low temperature in May: 63.1°F
The month with the highest average low temperature is August (80.4°F).
The coldest month (with the lowest average low temperature) is December (44.2°F).
Average pressure in May
Fountain Hills, AZ
- Average pressure in May: 29.85"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.83"Hg).
Average wind speed in May
Fountain Hills, AZ
- Average wind speed in May: 6.5mph
The windiest months (with the highest average wind speed) are April and May (6.5mph).
The calmest month (with the lowest average wind speed) is December (4.8mph).
Average humidity in May
Fountain Hills, AZ
- Average humidity in May: 21%
The month with the highest relative humidity is December (46%).
The month with the lowest relative humidity is June (17%).
Average rainfall in May
Fountain Hills, AZ
- Average rainfall in May: 0.12"
The wettest month (with the highest rainfall) is July (1.54").
The driest months (with the least rainfall) are May and June (0.12").
Average rainfall days in May
Fountain Hills, AZ
- Average rainfall days in May: 2.7 days
The month with the highest number of rainy days is July (12.2 days).
The month with the least rainy days is June (1.6 days).
Average daylight in May /
Average sunshine in May
Fountain Hills, AZ
- Average daylight in May: 13h and 54min
The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).
- Average sunshine in May: 11h and 54min
The month with the most sunshine is June (Average sunshine: 12h and 12min).
The month with the least sunshine is December (Average sunshine: 6h and 48min).
Average sunshine days in May
Fountain Hills, AZ
- Average sunshine days in May: 28 days
The month with the most sunshine days is May (28 days).
The month with the least sunshine days is July (14 days).
Average UV index in May
Fountain Hills, AZ
- Average UV index in May: 7
The months with the highest UV index are June, July and August (UV index 8).
The month with the lowest UV index is December (UV index 3).
Average cloud cover in May
Fountain Hills, AZ
- Average cloud cover in May: 8
The month with the most cloud cover is December (Cloud cover 21).
The month with the least cloud cover is June (Cloud cover 6).
Average visibility in May
Fountain Hills, AZ
- Average visibility in May: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
