San Luis weather in May

In May, San Luis sees average daytime highs of 18°C and overnight lows near 8°C, with 25 mm of precipitation across 4.2 wet days and about 10.3 hours of daylight. It is the 9th-warmest and 9th-wettest month of the year here.

Highs ease over the month, from about 20°C in the first days to 17°C by the end. The sky is clear or mostly clear about 43% of the time in May, and the air most often feels dry.

Daylight stretches from about 10 h 42 min at the start of May to 10 hours by month's end. Set against the rest of the year, May is San Luis's 12th-clearest and 12th-windiest month. For the whole year in context, see San Luis's year-round climate.

Daytime high
18°
9th warmest
Overnight low
4th coldest
Precipitation
25 mm
4.2 wet days
Daylight
10 h 18 min
8:13 AM – 6:30 PM
Cloud cover
49%
12th clearest
Wind
9 km/h
12th windiest
Solar energy
3.03 kWh/m²
Travel score
6.8
out of 10

San Luis is capital city of the San Luis Province in the Cuyo region of Argentina.

Founded
1594

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

Temperature in May

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 20°C in the first days to 17°C by the end.

A typical May day in San Luis reaches about 18°C in the afternoon and slips back to 8°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 12°C and 24°C. Set against its neighbours, May runs about 4°C cooler than April and about 2°C warmer than June.

10°20°30°151015202531
Avg high (°C)Avg low (°C)
12010
22010
32010
4209
5209
6209
7209
8209
9199
10199
11199
12198
13198
14198
15188
16188
17188
18188
19187
20187
21187
22177
23177
24177
25177
26176
27176
28176
29176
30176
31176

San Luis weather by month

How May compares with the rest of the year at a glance. May is the 9th-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan29° / 18°10713.3145.3
Feb28° / 17°8110.913.26.3
Mar26° / 15°8010.112.37.1
Apr22° / 11°53711.27.4
May18° / 254.210.36.8
Jun16° / 81.99.86.3
Jul16° / 92.1106.1
Aug18° / 152.610.87.4
Sep21° / 304.611.87.6
Oct24° / 12°668.712.87.5
Nov26° / 14°8911.713.76.7
Dec28° / 17°10213.114.25.8

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 43% of the time in May, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 15% of May, with mostly cloudy or overcast conditions the remaining 42%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16139
26139
36139
46139
56139
66040
76040
86040
95941
105941
115941
125941
135743
145743
155644
165644
175644
185644
195545
205545
215545
225545
235545
245644
255644
265743
275842
285941
296040
306139
316238

Chance of precipitation in May

Any precipitation

San Luis gets around 25 mm of rain and snow over 4.2 wet days in May. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 14% and peaks near 16% on the wettest days, and about 0 day brings snow.

0%10%20%30%151015202531
Rain chance (%)
116
215
315
415
515
614
714
814
914
1014
1115
1215
1315
1415
1515
1615
1715
1815
1915
2015
2115
2214
2314
2413
2513
2612
2712
2811
2910
3010
319

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 94% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
187121
287121
387121
488111
588111
690100
790100
89190
99280
109370
119370
129460
139460
149550
159550
169640
179640
189730
199730
209730
219730
229820
239820
249820
259820
269820
279820
289910
299910
309910
319910

Wind in May

Winds average 9 km/h in May, the calmest month.

Across May, daily wind ranges from about 9 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
69calm
79calm
89calm
99calm
109calm
119calm
129calm
139calm
149calm
159calm
169calm
179calm
189calm
199calm
209calm
219calm
229calm
239calm
249calm
259calm
269calm
279calm
289calm
299calm
309calm
319calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 10 h 42 min at the start of May to 10 hours by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 42 minutes over May. Sunrise moves from 8:02 AM to 8:23 AM, and sunset from 6:43 PM to 6:22 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
110.78:026:43
210.78:026:42
310.68:036:41
410.68:046:40
510.68:056:39
610.58:056:38
710.58:066:38
810.58:076:37
910.58:086:36
1010.48:086:35
1110.48:096:34
1210.48:106:33
1310.48:116:32
1410.38:116:32
1510.38:126:31
1610.38:136:30
1710.38:146:29
1810.28:146:29
1910.28:156:28
2010.28:166:27
2110.28:176:27
2210.18:176:26
2310.18:186:26
2410.18:196:25
2510.18:196:25
2610.18:206:24
2710.08:216:24
2810.08:216:23
2910.08:226:23
3010.08:236:22
3110.08:236:22

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 3.03 kWh/m².

For context, solar energy here swings from a low near 2.78 kWh/m² to a high of 7.59 kWh/m² in December across the year — May's 3.03 kWh/m² sits near the bottom.

01234151015202531
Solar energy (kWh/m²)Level
13.5Moderate
23.4Moderate
33.4Moderate
43.4Moderate
53.3Moderate
63.3Moderate
73.3Moderate
83.2Moderate
93.2Moderate
103.2Moderate
113.1Moderate
123.1Moderate
133.1Moderate
143.0Moderate
153.0Moderate
163.0Moderate
173.0Moderate
182.9Moderate
192.9Moderate
202.9Moderate
212.9Moderate
222.9Moderate
232.9Moderate
242.9Moderate
252.8Moderate
262.8Moderate
272.8Moderate
282.8Moderate
292.8Moderate
302.8Moderate
312.8Moderate
Planning a trip in May

Hazard calendar for San Luis

In seasonPeak

None of San Luis's seasonal hazards are active in May. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

San Luis's rainy season runs October–April, when most of the year's rain falls.

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

Is May a good time to visit San Luis?

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

6.8
Sightseeing
6th-best month of the year
2.6
Beach & pool
10th-best month of the year

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

What to pack for San Luis in May

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

In May, San Luis sees daytime highs around 18°C and nights near 8°C. Worth packing: a warm layer. About 4 days see rain.

a warm layer

UV index in San Luis in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May peaks around 4 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in San Luis peaks around January 17 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 21 at about 3 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeModerateHighVery highExtremeJan 17UV 14Jun 21UV 3
UV index (midday)Level
Jan14Extreme
Feb13Extreme
Mar10Extreme
Apr6High
May4Moderate
Jun3Moderate
Jul3Moderate
Aug4Moderate
Sep6High
Oct10Very high
Nov12Extreme
Dec13Extreme
Location & terrain

Where is San Luis?

San Luis sits at 33.3°S, 66.3°W, 729 m above sea level, in Argentina. The nearest listed city is Villa Mercedes, 91 km away.

Rodeo del MedioGeneral Alvear

Topography around San Luis

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

Within 3 km, the terrain around San Luis has only modest variations in elevation — a maximum elevation change of 121 m around an average of 743 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,416 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,820 m.

The land around San Luis is covered by artificial surfaces (72%) within 3 km, shrubs (50%) and grassland (24%) within 16 km, and shrubs (59%) and grassland (22%) within 80 km.

3 km
121 m
16 km
1,416 m
80 km
1,820 m
treesshrubsgrasslandcroplandartificial surfacesbare terrain
May weather nearby: Villa Mercedes 91 km · Villa Dolores 184 km · Río Cuarto 184 km · Rivadavia 199 km · San Martín 201 km · Embalse 217 km · Rodeo del Medio 222 km · General Alvear 226 km

Argentina travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type C / I
220 V · 50 Hz
Prices
≈ 46% of US
price level, 2025
GDP per capita
$14,898
2025
Happiness
6.4 / 10
World Happiness, 2025
Homicide rate
4.5
per 100k, 2023
Road deaths
14.1
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
High
EF EPI 575
Religion
Roman Catholic 63%none 19%Evangelical 15%Jehovah's Witness and Church of Jesus Christ 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 (-33.2914°, -66.3247°, elevation 729 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).