Casa Grande weather in May

In May, Casa Grande sees average daytime highs of 94°F and overnight lows near 65°F, with 0.1 in of rain across 0.6 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 91°F in the first days to 98°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 Casa Grande's 3rd-clearest and 2nd-windiest month. For the whole year in context, see Casa Grande's year-round climate.

Daytime high
94°
5th warmest
Overnight low
65°
8th coldest
Rainfall
0.1 in
0.6 wet days
Daylight
13 h 42 min
5:33 AM – 7:14 PM
Cloud cover
22%
3rd clearest
Wind
5 mph
2nd windiest
Solar energy
8.22 kWh/m²
Travel score
3.5
out of 10

Casa Grande is city in Pinal County, Arizona, United States.

Density
180/km²
people per km²
Founded
1879

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 91°F in the first days to 98°F by the end.

A typical May day in Casa Grande reaches about 94°F in the afternoon and slips back to 65°F overnight — a 29°F spread between the day's warmth and the night's chill. On most days the high lands between 84°F and 103°F. Set against its neighbours, May runs about 9°F warmer than April and about 9°F cooler than June.

60°80°100°151015202531
Avg high (°F)Avg low (°F)
19062
29162
39162
49163
59163
69263
79264
89264
99264
109364
119365
129365
139465
149465
159465
169466
179466
189566
199566
209566
219567
229667
239667
249667
259768
269768
279768
289868
299869
309969
319969

How May really feels in Casa Grande

Once humidity and wind are folded in, May averages 31 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
31
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.

Casa Grande 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
Jan67° / 43°1.03.510.17.5
Feb71° / 47°1.13.710.87.8
Mar78° / 52°0.72.711.88.3
Apr85° / 57°0.21.112.86.8
May94° / 65°0.10.613.73.5
Jun104° / 74°0.10.514.10.4
Jul105° / 81°0.83.913.90.0
Aug103° / 81°1.14.313.20.2
Sep99° / 74°0.93.112.21.8
Oct89° / 63°0.52.111.25.5
Nov76° / 51°0.51.810.38.6
Dec66° / 43°0.93.69.97.4

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 10% of May, with mostly cloudy or overcast conditions the remaining 13%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
18713
28713
38713
48713
58713
68713
78713
88515
98515
108515
118515
128515
138515
148515
158515
168515
178515
188515
198515
208515
218515
228713
238713
248713
258713
268911
278911
288911
299010
30919
31919

Chance of precipitation in May

Any precipitation

Casa Grande gets around 0.1 in of rain over 0.6 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 2% and peaks near 3% on the wettest days.

0%10%20%30%151015202531
Rain chance (%)
12
22
32
42
52
62
72
82
92
102
112
122
132
143
153
163
173
183
193
203
213
223
232
242
252
262
272
282
291
301
311

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
131000
141000
151000
16991
17991
18991
19991
20991
21991
22991
23991
24991
25991
26991
27991
28991
29991
30991
31991

Wind in May

Winds average 5 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
185calm
195calm
205calm
215calm
225calm
235calm
245calm
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 5:46 AM to 5:25 AM, and sunset from 7:03 PM to 7:24 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.35:467:03
213.35:457:03
313.35:447:04
413.45:437:05
513.45:427:06
613.45:417:06
713.55:407:07
813.55:397:08
913.55:387:09
1013.55:377:09
1113.65:367:10
1213.65:367:11
1313.65:357:12
1413.65:347:12
1513.75:337:13
1613.75:337:14
1713.75:327:15
1813.75:317:15
1913.85:317:16
2013.85:307:17
2113.85:297:17
2213.85:297:18
2313.85:287:19
2413.95:287:20
2513.95:277:20
2613.95:277:21
2713.95:267:22
2813.95:267:22
2914.05:267:23
3014.05:257:23
3114.05:257:24

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 8.22 kWh/m².

For context, solar energy here swings from a low near 3.25 kWh/m² to a high of 8.47 kWh/m² in June across the year — May's 8.22 kWh/m² sits near the top of that range.

02468151015202531
Solar energy (kWh/m²)Level
18.0Intense
28.0Intense
38.0Intense
48.0Intense
58.0Intense
68.1Intense
78.1Intense
88.1Intense
98.1Intense
108.1Intense
118.1Intense
128.2Intense
138.2Intense
148.2Intense
158.2Intense
168.2Intense
178.2Intense
188.2Intense
198.2Intense
208.3Intense
218.3Intense
228.3Intense
238.3Intense
248.3Intense
258.3Intense
268.4Intense
278.4Intense
288.4Intense
298.4Intense
308.4Intense
318.4Intense
Planning a trip in May

Is May a good time to visit Casa Grande?

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

3.5
Sightseeing
8th-best month of the year
7.2
Beach & pool
5th-best month of the year

May is a weaker month for outdoor sightseeing in Casa Grande. The water and warmth also suit a beach or pool day.

What to pack for Casa Grande in May

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

In May, Casa Grande sees daytime highs around 94°F and nights near 65°F. Pack light clothes and sun protection.

light clothessun protection

UV index in Casa Grande 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 Casa Grande 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 — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateVery highExtremeVery highHighModerateJun 23UV 11Dec 20UV 3
UV index (midday)Level
Jan4Moderate
Feb5Moderate
Mar5Moderate
Apr8Very high
May9Very high
Jun11Extreme
Jul11Extreme
Aug11Extreme
Sep9Very high
Oct7High
Nov5Moderate
Dec3Moderate

Air quality in Casa Grande 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 Casa Grande is worst in June — around 28 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (October, 12 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateJun 1626 µg/m³Oct 1212 µg/m³
PM2.5 (µg/m³)Level
Jan13Moderate
Feb13Moderate
Mar14Moderate
Apr14Moderate
May14Moderate
Jun28Moderate
Jul14Moderate
Aug13Moderate
Sep13Moderate
Oct12Moderate
Nov13Moderate
Dec13Moderate
Location & terrain

Where is Casa Grande?

Casa Grande sits at 32.9°N, 111.8°W, 1,398 ft above sea level, in United States. The nearest listed city is Eloy, 14 mi away.

Topography around Casa Grande

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

Within 2 miles, the terrain around Casa Grande has only modest variations in elevation — a maximum elevation change of 102 ft around an average of 1,398 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 2,182 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 4,928 ft.

The land around Casa Grande is covered by bare terrain (44%) and artificial surfaces (38%) within 2 miles, bare terrain (43%) and shrubs (25%) within 10 miles, and shrubs (59%) and bare terrain (20%) within 50 miles.

2 miles
102 ft
10 miles
2,182 ft
50 miles
4,928 ft
treesshrubsgrasslandcroplandartificial surfacesbare terrain
May weather nearby: Eloy 14 mi · Maricopa 21 mi · Florence 24 mi · San Tan Valley 25 mi · Queen Creek 27 mi · Chandler 30 mi · Gilbert 33 mi · Ahwatukee Foothills 35 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 Casa Grande (32.8795°, -111.7574°, elevation 1,398 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).