Fountain Hills weather in May

In May, Fountain Hills sees average daytime highs of 92°F and overnight lows near 66°F, with 0.2 in of rain across 0.8 wet days and about 13.7 hours of daylight. It is the 5th-warmest and 11th-wettest month of the year here.

Highs climb over the month, from about 89°F in the first days to 96°F by the end. The sky is clear or mostly clear about 77% of the time in May, and the air most often feels dry.

Daylight stretches from about 13 h 18 min at the start of May to 14 hours by month's end. Set against the rest of the year, May is Fountain Hills's 3rd-clearest and 2nd-windiest month. For the whole year in context, see Fountain Hills's year-round climate.

Daytime high
92°
5th warmest
Overnight low
66°
8th coldest
Rainfall
0.2 in
0.8 wet days
Daylight
13 h 42 min
5:31 AM – 7:15 PM
Cloud cover
22%
3rd clearest
Wind
6 mph
2nd windiest
Solar energy
8.17 kWh/m²
Travel score
4.3
out of 10

Fountain Hills is town in Maricopa County, Arizona, United States.

Density
452/km²
people per km²
Founded
1989

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in May

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 89°F in the first days to 96°F by the end.

A typical May day in Fountain Hills reaches about 92°F in the afternoon and slips back to 66°F overnight — a 27°F spread between the day's warmth and the night's chill. On most days the high lands between 82°F and 101°F. Set against its neighbours, May runs about 9°F warmer than April and about 10°F cooler than June.

60°80°100°151015202531
Avg high (°F)Avg low (°F)
18861
28962
38962
48962
58963
69063
79063
89064
99164
109164
119164
129165
139265
149265
159265
169266
179266
189366
199366
209367
219367
229467
239467
249468
259568
269568
279569
289669
299669
309769
319770

How May really feels in Fountain Hills

Once humidity and wind are folded in, May averages 26 days that feel above 90°F and 0 that feel at or below 32°F — the comfort signal a plain temperature reading hides.

Days feeling ≥ 90°F
26
heat index over the day's high
Days feeling ≤ 32°F
0
wind chill below the day's low

The story in May is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Fountain Hills weather by month

How May compares with the rest of the year at a glance. May is the 5th-warmest and 11th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysDaylight (hours)Travel score
Jan65° / 42°1.63.9107.3
Feb69° / 45°1.74.510.87.4
Mar75° / 50°1.13.211.78.3
Apr83° / 56°0.41.412.87.4
May92° / 66°0.20.813.74.3
Jun102° / 75°0.10.414.20.9
Jul104° / 82°0.73.2140.1
Aug102° / 81°1.0413.20.6
Sep97° / 74°1.0312.22.4
Oct87° / 61°0.82.211.26.2
Nov74° / 49°0.82.410.38.5
Dec64° / 42°1.34.19.87.0

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 77% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 9% of May, with mostly cloudy or overcast conditions the remaining 14%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
18713
28614
38614
48614
58614
68515
78515
88515
98515
108416
118416
128416
138416
148416
158416
168416
178416
188416
198416
208416
218416
228515
238614
248614
258713
268713
278812
288812
298911
309010
319010

Chance of precipitation in May

Any precipitation

Fountain Hills gets around 0.2 in of rain over 0.8 wet days in May. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 3% and peaks near 3% on the wettest days.

0%10%20%30%151015202531
Rain chance (%)
13
23
33
43
52
62
72
82
92
102
112
122
132
143
153
163
173
183
193
203
213
223
233
243
253
263
273
282
292
302
312

Humidity in May

DryComfortableHumidMuggyOppressiveMiserable

Most of May feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, May lands in the dry band about 99% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)
11000
21000
31000
41000
51000
61000
71000
81000
91000
101000
111000
121000
13991
14991
15991
16991
17991
18991
19991
20991
21991
22991
23991
24991
25991
26991
27991
28991
29991
30991
31991

Wind in May

Winds average 6 mph in May.

Across May, daily wind ranges from about 5 mph on the calmest days to 6 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (mph)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
255calm
265calm
275calm
285calm
295calm
305calm
315calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 13 h 18 min at the start of May to 14 hours by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 42 minutes over May. Sunrise moves from 5:44 AM to 5:23 AM, and sunset from 7:04 PM to 7:26 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.35:447:04
213.45:437:04
313.45:427:05
413.45:417:06
513.45:407:07
613.55:397:08
713.55:397:08
813.55:387:09
913.65:377:10
1013.65:367:11
1113.65:357:11
1213.65:347:12
1313.75:337:13
1413.75:337:14
1513.75:327:14
1613.75:317:15
1713.85:307:16
1813.85:307:17
1913.85:297:17
2013.85:287:18
2113.95:287:19
2213.95:277:20
2313.95:277:20
2413.95:267:21
2513.95:257:22
2614.05:257:22
2714.05:257:23
2814.05:247:24
2914.05:247:24
3014.05:237:25
3114.05:237:26

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 8.17 kWh/m².

For context, solar energy here swings from a low near 3.15 kWh/m² to a high of 8.46 kWh/m² in June across the year — May's 8.17 kWh/m² sits near the top of that range.

02468151015202531
Solar energy (kWh/m²)Level
17.9Intense
27.9Intense
37.9Intense
48.0Intense
58.0Intense
68.0Intense
78.0Intense
88.0Intense
98.1Intense
108.1Intense
118.1Intense
128.1Intense
138.1Intense
148.1Intense
158.1Intense
168.1Intense
178.2Intense
188.2Intense
198.2Intense
208.2Intense
218.2Intense
228.2Intense
238.3Intense
248.3Intense
258.3Intense
268.3Intense
278.3Intense
288.4Intense
298.4Intense
308.4Intense
318.4Intense
Planning a trip in May

Is May a good time to visit Fountain Hills?

Our two travel scores rate May for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

4.3
Sightseeing
8th-best month of the year
7.7
Beach & pool
3rd-best month of the year

May is a reasonable time to visit Fountain Hills for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Fountain Hills in May

From May's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In May, Fountain Hills sees daytime highs around 92°F and nights near 66°F. Pack light clothes and sun protection.

light clothessun protection

UV index in Fountain Hills in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May peaks around 9 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Fountain Hills peaks around June 23 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 11 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highExtremeVery highHighModerateJun 23UV 11Dec 20UV 3
UV index (midday)Level
Jan4Moderate
Feb5Moderate
Mar5Moderate
Apr7High
May9Very high
Jun11Extreme
Jul11Extreme
Aug11Extreme
Sep9Very high
Oct6High
Nov4Moderate
Dec3Moderate

Air quality in Fountain Hills in May

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where May falls, not just the annual average.

Air quality in Fountain Hills is worst in June — around 32 µg/m³ PM2.5 (moderate), about 2.8× the cleanest month (December, 11 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

010203040JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateGoodJun 1730 µg/m³Dec 1211 µg/m³
PM2.5 (µg/m³)Level
Jan12Moderate
Feb12Good
Mar12Good
Apr12Good
May13Moderate
Jun32Moderate
Jul15Moderate
Aug13Moderate
Sep13Moderate
Oct13Moderate
Nov12Good
Dec11Good
Location & terrain

Where is Fountain Hills?

Fountain Hills sits at 33.6°N, 111.7°W, 1,604 ft above sea level, in United States. The nearest listed city is Scottsdale, 12 mi away.

Topography around Fountain Hills

How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Fountain Hills.

Within 2 miles, the terrain around Fountain Hills has only modest variations in elevation — a maximum elevation change of 604 ft around an average of 1,647 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 2,822 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 7,270 ft.

The land around Fountain Hills is covered by shrubs (52%) and artificial surfaces (38%) within 2 miles, shrubs (69%) within 10 miles, and shrubs (54%) within 50 miles.

2 miles
604 ft
10 miles
2,822 ft
50 miles
7,270 ft
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
May weather nearby: Scottsdale 12 mi · Mesa 14 mi · Apache Junction 17 mi · Tempe 17 mi · Gilbert 19 mi · Tempe Junction 19 mi · Chandler 22 mi · Encanto 23 mi

United States travel facts

Power plugs
Type A / B
120 V · 60 Hz
Prices
≈ 100% of US
price level, 2025
GDP per capita
$90,027
2025
Happiness
6.8 / 10
World Happiness, 2025
Safe drinking water
98%
of population, 2024
Homicide rate
5.8
per 100k, 2023
Road deaths
12.7
per 100k/yr, 2019
Income group
High
World Bank
Religion
Protestant 47%unaffiliated 23%Roman Catholic 21%Jewish 2%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Fountain Hills (33.6117°, -111.7174°, elevation 1,604 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).