San Rafael weather in May

In May, San Rafael sees average daytime highs of 21°C and overnight lows near 8°C, with 166 mm of rain across 19.1 wet days and about 12.9 hours of daylight. It is the 2nd-warmest and 5th-wettest month of the year here.

Day-to-day highs hold fairly steady near 21°C through the month. The sky is clear or mostly clear about 18% of the time in May, and the air most often feels dry.

Daylight stretches from about 12 h 42 min at the start of May to 13 h 06 min by month's end. Set against the rest of the year, May is San Rafael's 7th-clearest and 8th-windiest month. For the whole year in context, see San Rafael's year-round climate.

Daytime high
21°
2nd warmest
Overnight low
8th coldest
Rainfall
166 mm
19.1 wet days
Daylight
12 h 54 min
6:04 AM – 6:58 PM
Cloud cover
62%
7th clearest
Wind
5 km/h
8th windiest
Solar energy
6.6 kWh/m²
Travel score
5.2
out of 10

San Rafael is town in Tlalmanalco municipality, State of Mexico, Mexico.

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

Temperature in May

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 21°C through the month.

A typical May day in San Rafael reaches about 21°C in the afternoon and slips back to 8°C overnight — a 13°C spread between the day's warmth and the night's chill. On most days the high lands between 18°C and 24°C. Set against its neighbours, May runs on par with April and about 1°C warmer than June.

10°15°20°25°151015202531
Avg high (°C)Avg low (°C)
1218
2218
3218
4218
5218
6218
7218
8218
9218
10218
11218
12218
13218
14218
15218
16218
17218
18218
19218
20218
21218
22218
23219
24219
25219
26219
27219
28219
29219
30219
31219

San Rafael weather by month

How May compares with the rest of the year at a glance. May is the 2nd-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan17° / 285.3116.5
Feb19° / 285.911.37.0
Mar20° / 539.811.96.7
Apr21° / 9713.912.46.0
May21° / 16619.112.95.2
Jun20° / 27423.313.14.2
Jul19° / 27626.7133.7
Aug19° / 28626.812.73.7
Sep19° / 27424.712.13.8
Oct19° / 1351611.65.2
Nov18° / 498.211.16.4
Dec18° / 193.910.96.8

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 18% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 28% of May, with mostly cloudy or overcast conditions the remaining 54%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15248
25149
35149
45050
54852
64852
74753
84753
94555
104555
114456
124456
134456
144456
154555
164654
174753
184753
194654
204654
214753
224654
234654
244654
254456
264357
274357
284357
294159
304060
313961

Chance of precipitation in May

Any precipitation

San Rafael gets around 166 mm of rain over 19.1 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 61% and peaks near 65% on the wettest days.

0%20%40%60%80%151015202531
Rain chance (%)
158
259
360
461
562
662
763
863
964
1064
1163
1263
1363
1462
1562
1661
1761
1860
1960
2059
2159
2259
2359
2460
2560
2661
2761
2862
2963
3064
3165

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 100% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)
1100
2100
3100
4100
5100
6100
7100
8100
9100
10100
11100
12100
13100
14100
15100
16100
17100
18100
19100
20100
21100
22100
23100
24100
25100
26100
27100
28100
29100
30100
31100

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 5 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
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 42 min at the start of May to 13 h 06 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 24 minutes over May. Sunrise moves from 6:12 AM to 6:01 AM, and sunset from 6:53 PM to 7:04 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.76:126:53
212.76:116:53
312.76:106:54
412.76:106:54
512.86:096:54
612.86:096:55
712.86:086:55
812.86:086:55
912.86:076:56
1012.86:076:56
1112.86:066:56
1212.96:066:57
1312.96:056:57
1412.96:056:58
1512.96:056:58
1612.96:046:58
1712.96:046:59
1812.96:036:59
1912.96:037:00
2013.06:037:00
2113.06:037:00
2213.06:027:01
2313.06:027:01
2413.06:027:02
2513.06:027:02
2613.06:017:02
2713.06:017:03
2813.06:017:03
2913.06:017:04
3013.16:017:04
3113.16:017:04

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 6.6 kWh/m².

For context, solar energy here swings from a low near 5.02 kWh/m² to a high of 6.88 kWh/m² in April across the year — May's 6.6 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
16.8Intense
26.8Intense
36.7Intense
46.7Intense
56.7Intense
66.7Intense
76.7Intense
86.7Intense
96.6Intense
106.6Intense
116.6Intense
126.6Intense
136.6Intense
146.6Intense
156.6Intense
166.6Intense
176.6Intense
186.6Intense
196.6Intense
206.6Intense
216.6Intense
226.6Intense
236.6Intense
246.5Intense
256.5Intense
266.5Intense
276.5Intense
286.5Intense
296.4Intense
306.4Intense
316.4Intense
Planning a trip in May

Hazard calendar for San Rafael

In seasonPeak

In May, San Rafael sits inside its monsoon season. The full year is below, with each hazard's peak months called out.

San Rafael's monsoon runs May–October, when most of the year's rain falls.

Monsoon
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is May a good time to visit San Rafael?

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

5.2
Sightseeing
7th-best month of the year
3.2
Beach & pool
3rd-best month of the year

May is a reasonable time to visit San Rafael for sightseeing.

What to pack for San Rafael in May

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

In May, San Rafael sees daytime highs around 21°C and nights near 8°C. Pack rain gear and sun protection. About 19 days see rain.

rain gearsun protection

UV index in San Rafael 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 San Rafael peaks around April 10 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 14 at about 8 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highApr 10UV 15Dec 14UV 8
UV index (midday)Level
Jan9Very high
Feb12Extreme
Mar14Extreme
Apr15Extreme
May11Extreme
Jun14Extreme
Jul12Extreme
Aug14Extreme
Sep12Extreme
Oct11Extreme
Nov9Very high
Dec8Very high

Air quality in San Rafael 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 San Rafael is worst in December — around 179 µg/m³ PM2.5 (very unhealthy), and holds fairly steady the rest of the year.

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

0306090120150180210JanFebMarAprMayJunJulAugSepOctNovDecUnhealthyVery unhealthyDec 11178 µg/m³Apr 14115 µg/m³
PM2.5 (µg/m³)Level
Jan149Unhealthy
Feb141Unhealthy
Mar126Unhealthy
Apr113Unhealthy
May134Unhealthy
Jun126Unhealthy
Jul135Unhealthy
Aug127Unhealthy
Sep136Unhealthy
Oct137Unhealthy
Nov174Very unhealthy
Dec179Very unhealthy
Location & terrain

Where is San Rafael?

San Rafael sits at 19.2°N, 98.8°W, 2,552 m above sea level, in Mexico. The nearest listed city is Amecameca, 10 km away.

Topography around San Rafael

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

Within 3 km, the terrain around San Rafael has large variations in elevation — a maximum elevation change of 787 m around an average of 2,666 m above sea level; within 16 km, extreme variations in elevation — a maximum elevation change of 2,970 m; within 80 km, extreme variations in elevation — a maximum elevation change of 4,520 m.

The land around San Rafael is covered by trees (73%) within 3 km, trees (48%) and cropland (25%) within 16 km, and trees (32%) and cropland (28%) within 80 km.

3 km
787 m
16 km
2,970 m
80 km
4,520 m
treesshrubsgrasslandcroplandartificial surfacesbare terrain
May weather nearby: Amecameca 10 km · San Martín Cuautlalpan 11 km · San Jerónimo Cuatro Vientos 13 km · San Buenaventura 15 km · Chalco 16 km · Juchitepec 18 km · Ixtapaluca 18 km · San Mateo Huitzilzingo 18 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 San Rafael (19.2096°, -98.7564°, elevation 2,552 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).