San Luis Río Colorado weather in May

In May, San Luis Río Colorado sees average daytime highs of 35°C and overnight lows near 20°C, with 1 mm of rain across 0.2 wet days and about 13.6 hours of daylight. It is the 5th-warmest and 11th-wettest month of the year here.

Highs climb over the month, from about 33°C in the first days to 36°C by the end. The sky is clear or mostly clear about 83% 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 San Luis Río Colorado's 4th-clearest and 4th-windiest month. For the whole year in context, see San Luis Río Colorado's year-round climate.

Daytime high
35°
5th warmest
Overnight low
20°
8th coldest
Rainfall
1 mm
0.2 wet days
Daylight
13 h 42 min
5:46 AM – 7:25 PM
Cloud cover
17%
4th clearest
Wind
10 km/h
4th windiest
Solar energy
8.25 kWh/m²
Travel score
3.5
out of 10

San Luis Río Colorado is municipal seat of San Luis, State of Sonora, Mexico.

Founded
1918

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 33°C in the first days to 36°C by the end.

A typical May day in San Luis Río Colorado reaches about 35°C in the afternoon and slips back to 20°C overnight — a 15°C spread between the day's warmth and the night's chill. On most days the high lands between 30°C and 40°C. Set against its neighbours, May runs about 4°C warmer than April and about 4°C cooler than June.

10°20°30°40°151015202531
Avg high (°C)Avg low (°C)
13318
23318
33319
43419
53419
63419
73419
83419
93419
103419
113419
123420
133420
143520
153520
163520
173520
183520
193520
203520
213520
223521
233621
243621
253621
263621
273621
283621
293621
303722
313722

How May really feels in San Luis Río Colorado

Once humidity and wind are folded in, May averages 31 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
31
heat index over the day's high
Days feeling ≤ C
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.

San Luis Río Colorado 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 (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan22° / 10°91.510.18.4
Feb24° / 11°132.310.88.6
Mar27° / 13°101.511.88.1
Apr31° / 16°30.612.86.1
May35° / 20°10.213.63.5
Jun39° / 24°10.214.10.7
Jul41° / 28°51.513.90.0
Aug41° / 29°112.913.20.0
Sep38° / 25°132.212.21.2
Oct33° / 19°50.911.24.9
Nov26° / 13°60.810.38.6
Dec21° / 91.79.98.2

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 83% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 8% of May, with mostly cloudy or overcast conditions the remaining 10%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
1919
2919
3919
49010
59010
69010
79010
89010
99010
109010
118911
128911
138911
148911
159010
169010
179010
189010
199010
209010
219010
229010
23919
24919
259010
26919
27919
28919
29919
30919
31919

Chance of precipitation in May

Any precipitation

San Luis Río Colorado gets around 1 mm of rain over 0.2 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 1% and peaks near 1% on the wettest days.

0%10%20%30%151015202531
Rain chance (%)
11
21
31
41
51
61
71
81
91
101
111
121
131
141
151
161
171
181
191
201
211
221
231
241
251
261
271
281
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 96% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
110000
29910
39910
49910
59910
69910
79910
89910
99910
109820
119820
129820
139820
149820
159820
169730
179730
189730
199730
209640
219640
229541
239451
249451
259361
269361
279271
289271
299181
309181
319091

Wind in May

Winds average 10 km/h in May.

Across May, daily wind ranges from about 10 km/h on the calmest days to 10 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
110calm
210calm
310calm
410calm
510calm
610calm
710calm
810calm
910calm
1010calm
1110calm
1210calm
1310calm
1410calm
1510calm
1610calm
1710calm
1810calm
1910calm
2010calm
2110calm
2210calm
2310calm
2410calm
2510calm
2610calm
2710calm
2810calm
2910calm
3010calm
3110calm

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 5:58 AM to 5:38 AM, and sunset from 7:14 PM to 7:35 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.35:587:14
213.35:577:15
313.35:567:16
413.35:557:16
513.45:557:17
613.45:547:18
713.45:537:19
813.55:527:19
913.55:517:20
1013.55:507:21
1113.55:497:22
1213.65:487:22
1313.65:487:23
1413.65:477:24
1513.65:467:24
1613.75:467:25
1713.75:457:26
1813.75:447:27
1913.75:447:27
2013.85:437:28
2113.85:427:29
2213.85:427:29
2313.85:417:30
2413.85:417:31
2513.95:407:31
2613.95:407:32
2713.95:397:33
2813.95:397:33
2913.95:397:34
3013.95:387:35
3114.05:387:35

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 8.25 kWh/m².

For context, solar energy here swings from a low near 3.4 kWh/m² to a high of 8.49 kWh/m² in June across the year — May's 8.25 kWh/m² sits near the top of that range.

02468151015202531
Solar energy (kWh/m²)Level
18.0Intense
28.0Intense
38.0Intense
48.1Intense
58.1Intense
68.1Intense
78.1Intense
88.1Intense
98.1Intense
108.2Intense
118.2Intense
128.2Intense
138.2Intense
148.2Intense
158.2Intense
168.3Intense
178.3Intense
188.3Intense
198.3Intense
208.3Intense
218.3Intense
228.3Intense
238.4Intense
248.4Intense
258.4Intense
268.4Intense
278.4Intense
288.4Intense
298.4Intense
308.4Intense
318.5Intense
Planning a trip in May

Is May a good time to visit San Luis Río Colorado?

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
7.3
Beach & pool
5th-best month of the year

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

What to pack for San Luis Río Colorado in May

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

In May, San Luis Río Colorado sees daytime highs around 35°C and nights near 20°C. Pack light clothes and sun protection.

light clothessun protection

UV index in San Luis Río Colorado in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May peaks around 8 (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 Luis Río Colorado peaks around June 23 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 18 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 18UV 3
UV index (midday)Level
Jan4Moderate
Feb5Moderate
Mar5Moderate
Apr8Very high
May8Very high
Jun11Extreme
Jul11Extreme
Aug10Very high
Sep9Very high
Oct6High
Nov4Moderate
Dec3Moderate
Location & terrain

Where is San Luis Río Colorado?

San Luis Río Colorado sits at 32.5°N, 114.8°W, 36 m above sea level, in Mexico. The nearest listed city is San Luis, 4.0 km away.

Topography around San Luis Río Colorado

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

Within 3 km, the terrain around San Luis Río Colorado has only modest variations in elevation — a maximum elevation change of 24 m around an average of 44 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 53 m; within 80 km, large variations in elevation — a maximum elevation change of 1,108 m.

The land around San Luis Río Colorado is covered by artificial surfaces (83%) within 3 km, bare terrain (56%) and cropland (32%) within 16 km, and bare terrain (73%) within 80 km.

3 km
24 m
16 km
53 m
80 km
1,108 m
treesshrubscroplandartificial surfacesbare terrainwaterwetland
May weather nearby: San Luis 4.0 km · Somerton 17 km · Yuma 33 km · Ciudad Guadalupe Victoria 36 km · Fortuna Foothills 40 km · Puebla 56 km · Mexicali 67 km · Calexico 73 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 Luis Río Colorado (32.4555°, -114.7704°, elevation 36 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. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).