Alamo weather in May

In May, Alamo sees average daytime highs of 91°F and overnight lows near 73°F, with 2.1 in of rain across 6.9 wet days and about 13.3 hours of daylight. It is the 5th-warmest and 5th-wettest month of the year here.

Highs climb over the month, from about 90°F in the first days to 94°F by the end. The sky is clear or mostly clear about 41% of the time in May, and the air most often feels oppressive.

Daylight stretches from about 13 hours at the start of May to 13 h 30 min by month's end. Set against the rest of the year, May is Alamo's 5th-clearest and 1st-windiest month. For the whole year in context, see Alamo's year-round climate.

Daytime high
91°
5th warmest
Overnight low
73°
8th coldest
Rainfall
2.1 in
6.9 wet days
Daylight
13 h 18 min
5:50 AM – 7:07 PM
Cloud cover
48%
5th clearest
Wind
12 mph
1st windiest
Solar energy
6.27 kWh/m²
Travel score
3.8
out of 10

Alamo is city in Hidalgo County, Texas, United States.

Density
1,046/km²
people per km²
Founded
1924

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 90°F in the first days to 94°F by the end.

A typical May day in Alamo reaches about 91°F in the afternoon and slips back to 73°F overnight — a 18°F spread between the day's warmth and the night's chill. On most days the high lands between 84°F and 98°F. Set against its neighbours, May runs about 5°F warmer than April and about 4°F cooler than June.

60°70°80°90°100°151015202531
Avg high (°F)Avg low (°F)
18971
29071
39071
49071
59072
69072
79072
89072
99172
109173
119173
129173
139173
149173
159173
169173
179174
189274
199274
209274
219274
229274
239274
249275
259375
269375
279375
289375
299476
309476
319476

How May really feels in Alamo

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
2 feel dangerously hot (≥ 102°F)
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.

Alamo weather by month

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

MonthHigh / Low (°F)Rainfall (inches)Wet daysDaylight (hours)Travel score
Jan72° / 53°1.14.810.57.4
Feb76° / 56°1.04.811.17.7
Mar81° / 62°1.55.511.87.0
Apr87° / 68°1.75.512.65.3
May91° / 73°2.16.913.33.8
Jun95° / 77°2.17.713.62.7
Jul97° / 78°2.2713.52.3
Aug97° / 78°1.77.712.92.1
Sep92° / 75°3.61312.23.2
Oct87° / 68°2.57.211.45.3
Nov79° / 60°1.56.210.77.4
Dec73° / 54°1.35.410.47.5

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 41% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 23% of May, with mostly cloudy or overcast conditions the remaining 35%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15941
25941
35842
45842
55941
65842
75842
85842
95842
105842
115941
126139
136238
146238
156337
166436
176535
186634
196733
206832
216931
226931
237129
247129
257228
267228
277327
287426
297426
307426
317624

Chance of precipitation in May

Any precipitation

Alamo gets around 2.1 in of rain over 6.9 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 22% and peaks near 24% on the wettest days.

0%10%20%30%151015202531
Rain chance (%)
118
218
319
419
520
620
721
822
922
1022
1123
1223
1323
1423
1523
1623
1723
1823
1923
2023
2122
2222
2323
2423
2523
2623
2723
2823
2924
3024
3124

Humidity in May

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, May lands in the oppressive band about 59% of days. Sticky, muggy-or-worse air turns up on roughly 87% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1791227432
2791226452
3781225472
4671124492
5671124502
6561023542
7561023542
8551023552
9451023562
1045923563
1134923583
1234923583
1324923584
1424924574
1524824575
1613824586
1713824586
1813724587
1913724587
2012624598
2112623608
2212522628
2312522619
2412421639
2511420659
2601319689
2701318699
28012177010
29002167210
30001157311
31001157311

Wind in May

Winds average 12 mph in May, the windiest month of the year.

Across May, daily wind ranges from about 11 mph on the calmest days to 12 mph at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (mph)Feels
112light breeze
212light breeze
312light breeze
412light breeze
512light breeze
612light breeze
712light breeze
812light breeze
912light breeze
1012light breeze
1112light breeze
1212light breeze
1312light breeze
1412light breeze
1512light breeze
1612light breeze
1712light breeze
1812light breeze
1912light breeze
2012light breeze
2112light breeze
2212light breeze
2312light breeze
2412light breeze
2511light breeze
2611light breeze
2711light breeze
2811light breeze
2911light breeze
3011light breeze
3111light breeze

Sunrise & sunset in May

DaylightNight

Daylight runs from about 13 hours at the start of May to 13 h 30 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 30 minutes over May. Sunrise moves from 6:00 AM to 5:45 AM, and sunset from 6:59 PM to 7:15 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.06:006:59
213.06:006:59
313.05:597:00
413.05:587:01
513.15:577:01
613.15:577:02
713.15:567:02
813.15:557:03
913.15:557:03
1013.25:547:04
1113.25:537:04
1213.25:537:05
1313.25:527:05
1413.25:517:06
1513.35:517:07
1613.35:507:07
1713.35:507:08
1813.35:497:08
1913.35:497:09
2013.35:487:09
2113.45:487:10
2213.45:487:10
2313.45:477:11
2413.45:477:11
2513.45:467:12
2613.45:467:12
2713.55:467:13
2813.55:457:14
2913.55:457:14
3013.55:457:15
3113.55:457:15

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 6.27 kWh/m².

For context, solar energy here swings from a low near 2.99 kWh/m² to a high of 6.73 kWh/m² in July across the year — May's 6.27 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
16.1Intense
26.1Intense
36.1Intense
46.1Intense
56.1Intense
66.1Intense
76.1Intense
86.2Intense
96.2Intense
106.2Intense
116.2Intense
126.2Intense
136.2Intense
146.2Intense
156.2Intense
166.3Intense
176.3Intense
186.3Intense
196.3Intense
206.3Intense
216.4Intense
226.4Intense
236.4Intense
246.4Intense
256.4Intense
266.5Intense
276.5Intense
286.5Intense
296.5Intense
306.5Intense
316.5Intense
Planning a trip in May

Is May a good time to visit Alamo?

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

3.8
Sightseeing
8th-best month of the year
6.8
Beach & pool
5th-best month of the year

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

What to pack for Alamo in May

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

In May, Alamo sees daytime highs around 91°F and nights near 73°F. Pack light clothes and sun protection. About 7 days see rain.

light clothessun protection

UV index in Alamo 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 Alamo peaks around June 21 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 5 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecHighVery highExtremeVery highExtremeVery highHighJun 21UV 12Dec 22UV 5
UV index (midday)Level
Jan5Moderate
Feb7High
Mar8Very high
Apr11Extreme
May9Very high
Jun12Extreme
Jul11Extreme
Aug11Extreme
Sep10Very high
Oct8Very high
Nov6High
Dec5Moderate

Air quality in Alamo 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 Alamo is worst in July — around 26 µg/m³ PM2.5 (moderate), about 3.5× the cleanest month (November, 7 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1625 µg/m³Nov 107 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb10Good
Mar11Good
Apr13Moderate
May20Moderate
Jun21Moderate
Jul26Moderate
Aug19Moderate
Sep12Moderate
Oct8Good
Nov7Good
Dec9Good
Location & terrain

Where is Alamo?

Alamo sits at 26.2°N, 98.1°W, 98 ft above sea level, in United States. The nearest listed city is San Juan, 1.9 mi away.

Topography around Alamo

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

Within 2 miles, the terrain around Alamo has only modest variations in elevation — a maximum elevation change of 33 ft around an average of 102 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 167 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,010 ft.

The land around Alamo is covered by artificial surfaces (40%) and cropland (21%) within 2 miles, cropland (34%), artificial surfaces (24%) and trees (20%) within 10 miles, and cropland (38%) and grassland (25%) within 50 miles.

2 miles
33 ft
10 miles
167 ft
50 miles
1,010 ft
treesshrubsgrasslandcroplandartificial surfacesbare terrainwaterwetland
May weather nearby: San Juan 1.9 mi · Pharr 3.7 mi · Donna 4.3 mi · McAllen 6.8 mi · Weslaco 8.1 mi · Edinburg 8.7 mi · Reynosa 12 mi · Mission 12 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 Alamo (26.1837°, -98.1231°, elevation 98 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).