Santiago weather in May

In May, Santiago sees average daytime highs of 27°C and overnight lows near 16°C, with 158 mm of rain across 16 wet days and about 13.2 hours of daylight. It is the 4th-warmest and 3rd-wettest month of the year here.

Highs climb over the month, from about 26°C in the first days to 28°C by the end. The sky is clear or mostly clear about 39% of the time in May, and the air most often feels humid.

Daylight stretches from about 12 h 54 min at the start of May to 13 h 30 min by month's end. Set against the rest of the year, May is Santiago's 9th-clearest and 6th-windiest month. For the whole year in context, see Santiago's year-round climate.

Daytime high
27°
4th warmest
Overnight low
16°
8th coldest
Rainfall
158 mm
16 wet days
Daylight
13 h 12 min
6:00 AM – 7:14 PM
Cloud cover
50%
9th clearest
Wind
5 km/h
6th windiest
Solar energy
6.63 kWh/m²
Travel score
5.9
out of 10

Santiago is municipal seat of Santiago, State of Nuevo León, Mexico.

Founded
1648

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 26°C in the first days to 28°C by the end.

A typical May day in Santiago reaches about 27°C in the afternoon and slips back to 16°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 23°C and 31°C. Set against its neighbours, May runs about 2°C warmer than April and about 2°C cooler than June.

10°15°20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
12615
22615
32615
42615
52616
62616
72616
82616
92616
102616
112616
122716
132716
142716
152716
162716
172716
182716
192717
202717
212717
222717
232717
242717
252717
262717
272817
282817
292817
302817
312817

Santiago weather by month

How May compares with the rest of the year at a glance. May is the 4th-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan17° / 609.310.65.9
Feb20° / 8410.111.16.3
Mar22° / 11°13114.211.86.2
Apr25° / 14°17215.612.66.1
May27° / 16°1581613.25.9
Jun28° / 18°871113.66.0
Jul29° / 18°8810.413.45.8
Aug29° / 18°6810.412.95.9
Sep26° / 17°19116.212.25.8
Oct24° / 14°10711.111.47.0
Nov20° / 10°669.210.86.7
Dec18° / 477.110.46.3

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 39% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 25% of May, with mostly cloudy or overcast conditions the remaining 36%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16040
25941
36040
46040
56139
66139
76238
86238
96238
106238
116337
126337
136337
146337
156436
166337
176436
186436
196436
206436
216436
226535
236535
246634
256634
266733
276733
286832
296832
306931
316931

Chance of precipitation in May

Any precipitation

Santiago gets around 158 mm of rain over 16 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 51% and peaks near 54% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)
152
253
353
453
553
654
754
854
954
1054
1154
1254
1354
1454
1554
1653
1753
1853
1952
2052
2151
2250
2349
2448
2547
2646
2745
2844
2943
3042
3141

Humidity in May

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, May lands in the humid band about 51% of days. Sticky, muggy-or-worse air turns up on roughly 21% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
121284110
219284210
318274411
416274512
515264613
613264714
712254914
810255015
99255016
108255116
117255117
126245317
135245318
145245318
154235419
164235320
174225321
184215322
193205423
203195424
213185425
222175526
232175427
242165428
252155528
261145629
271145530
281135531
291135432
301135333
311135234

Wind in May

Winds average 5 km/h in May.

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

0246810151015202531
Wind speed (km/h)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
185calm
195calm
205calm
215calm
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm
315calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 12 h 54 min 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 36 minutes over May. Sunrise moves from 6:10 AM to 5:54 AM, and sunset from 7:06 PM to 7:22 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.96:107:06
213.06:097:07
313.06:087:07
413.06:077:08
513.06:077:08
613.06:067:09
713.16:057:09
813.16:047:10
913.16:047:10
1013.16:037:11
1113.16:037:11
1213.26:027:12
1313.26:017:12
1413.26:017:13
1513.26:007:13
1613.26:007:14
1713.35:597:14
1813.35:597:15
1913.35:587:16
2013.35:587:16
2113.35:577:17
2213.35:577:17
2313.35:577:18
2413.45:567:18
2513.45:567:19
2613.45:567:19
2713.45:557:20
2813.45:557:20
2913.45:557:21
3013.45:557:21
3113.55:547:22

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 6.63 kWh/m².

For context, solar energy here swings from a low near 3.73 kWh/m² to a high of 6.76 kWh/m² in June across the year — May's 6.63 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
16.5Intense
26.5Intense
36.5Intense
46.6Intense
56.6Intense
66.6Intense
76.6Intense
86.6Intense
96.6Intense
106.6Intense
116.6Intense
126.6Intense
136.6Intense
146.6Intense
156.6Intense
166.6Intense
176.6Intense
186.6Intense
196.7Intense
206.7Intense
216.7Intense
226.7Intense
236.7Intense
246.7Intense
256.7Intense
266.7Intense
276.7Intense
286.8Intense
296.8Intense
306.8Intense
316.8Intense
Planning a trip in May

Is May a good time to visit Santiago?

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

5.9
Sightseeing
8th-best month of the year
5.9
Beach & pool
4th-best month of the year

May is a reasonable time to visit Santiago for sightseeing.

What to pack for Santiago in May

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

In May, Santiago sees daytime highs around 27°C and nights near 16°C. Pack rain gear and sun protection. Worth having: light clothes. About 16 days see rain.

rain gearsun protectionlight clothes

UV index in Santiago in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May peaks around 11 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Santiago peaks around June 21 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 19 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 highHighJun 21UV 11Dec 19UV 5
UV index (midday)Level
Jan5High
Feb7Very high
Mar9Very high
Apr11Extreme
May11Extreme
Jun12Extreme
Jul11Extreme
Aug12Extreme
Sep9Very high
Oct8Very high
Nov6High
Dec5Moderate

Air quality in Santiago 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 Santiago is worst in December — around 24 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateDec 1724 µg/m³Aug 1518 µg/m³
PM2.5 (µg/m³)Level
Jan23Moderate
Feb21Moderate
Mar24Moderate
Apr21Moderate
May22Moderate
Jun20Moderate
Jul19Moderate
Aug18Moderate
Sep20Moderate
Oct20Moderate
Nov22Moderate
Dec24Moderate
Location & terrain

Where is Santiago?

Santiago sits at 25.4°N, 100.2°W, 486 m above sea level, in Mexico. The nearest listed city is Ciudad de Allende, 21 km away.

Topography around Santiago

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Santiago.

Within 3 km, the terrain around Santiago has significant variations in elevation — a maximum elevation change of 452 m around an average of 513 m above sea level; within 16 km, extreme variations in elevation — a maximum elevation change of 2,598 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,555 m.

The land around Santiago is covered by trees (68%) within 3 km, trees (81%) within 16 km, and shrubs (47%) and trees (36%) within 80 km.

3 km
452 m
16 km
2,598 m
80 km
3,555 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
May weather nearby: Ciudad de Allende 21 km · Jardines de la Silla 23 km · Cadereyta Jiménez 24 km · Cadereyta 24 km · Ciudad Benito Juárez 25 km · Guadalupe 30 km · Monterrey 33 km · San Pedro Garza García 36 km

Mexico travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type A / B
120 / 127 V · 60 Hz
Prices
≈ 54% of US
price level, 2025
GDP per capita
$13,889
2025
Happiness
7.0 / 10
World Happiness, 2025
Safe drinking water
43%
of population, 2024
Homicide rate
24.9
per 100k, 2023
Road deaths
12.8
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
Very low
EF EPI 440
Religion
Catholic 78%no religion 11%other Evangelical Churches 8%Jehovah Witness 1%

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 Santiago (25.426°, -100.154°, elevation 486 m), 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).