San Luis weather in January

In January, San Luis sees average daytime highs of 29°C and overnight lows near 18°C, with 107 mm of rain across 13.3 wet days and about 14 hours of daylight. It is the 1st-warmest and 1st-wettest month of the year here.

Day-to-day highs hold fairly steady near 29°C through the month. The sky is clear or mostly clear about 50% of the time in January, and the air most often feels dry.

Daylight stretches from about 14 h 12 min at the start of January to 13 h 42 min by month's end. Set against the rest of the year, January is San Luis's 10th-clearest and 6th-windiest month. For the whole year in context, see San Luis's year-round climate.

Daytime high
29°
1st warmest
Overnight low
18°
12th coldest
Rainfall
107 mm
13.3 wet days
Daylight
14 hours
6:35 AM – 8:34 PM
Cloud cover
42%
10th clearest
Wind
11 km/h
6th windiest
Solar energy
7.32 kWh/m²
Travel score
5.3
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 January

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 29°C through the month.

A typical January day in San Luis reaches about 29°C in the afternoon and slips back to 18°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 24°C and 34°C. Set against its neighbours, January runs on par with December and about 1°C warmer than February.

10°15°20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
12918
22918
32918
42918
52918
62918
72918
82918
92918
102918
112918
122918
132918
142918
152918
162918
172918
182918
192918
202918
212918
222918
232918
242918
252918
262918
272918
282918
292918
302918
312918

San Luis weather by month

How January compares with the rest of the year at a glance. January is the 1st-warmest and 1st-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 January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 50% of the time in January.

Beyond those clear spells, partly cloudy skies cover about 26% of January, with mostly cloudy or overcast conditions the remaining 24%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
17426
27426
37228
47228
57228
67228
77228
87327
97327
107327
117327
127426
137426
147426
157525
167525
177624
187624
197624
207822
217822
227822
237822
247921
257921
267921
277921
287921
297822
307822
317822

Chance of precipitation in January

Any precipitation

San Luis gets around 107 mm of rain over 13.3 wet days in January, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 43% and peaks near 46% on the wettest days.

0%20%40%60%151015202531
Rain chance (%)
145
245
346
446
546
646
746
845
945
1045
1144
1244
1344
1444
1543
1643
1742
1842
1942
2041
2141
2241
2341
2441
2541
2641
2742
2842
2942
3042
3142

Humidity in January

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, January lands in the dry band about 34% of days. Sticky, muggy-or-worse air turns up on roughly 7% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
13827297
23726307
33725308
43625318
53624318
63624328
73624318
83624318
93625308
103626308
113627298
123528288
133530278
143431278
153433267
163334257
173336257
183237247
193238236
203239236
213240226
223240226
233240226
243241226
253140226
263140226
273139237
283139237
293138247
303137248
313136258

Wind in January

Winds average 11 km/h in January.

Across January, daily wind ranges from about 11 km/h on the calmest days to 12 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
112calm
212calm
311calm
411calm
511calm
611calm
711calm
811calm
911calm
1011calm
1111calm
1211calm
1311calm
1411calm
1511calm
1611calm
1711calm
1811calm
1911calm
2011calm
2111calm
2211calm
2311calm
2411calm
2511calm
2611calm
2711calm
2811calm
2911calm
3011calm
3111calm

Sunrise & sunset in January

DaylightNight

Daylight runs from about 14 h 12 min at the start of January to 13 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 30 minutes over January. Sunrise moves from 6:23 AM to 6:49 AM, and sunset from 8:33 PM to 8:28 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.26:238:33
214.26:248:34
314.26:258:34
414.16:268:34
514.16:268:34
614.16:278:34
714.16:288:34
814.16:298:34
914.16:298:34
1014.16:308:34
1114.16:318:34
1214.06:328:34
1314.06:338:34
1414.06:348:34
1514.06:348:34
1614.06:358:34
1714.06:368:34
1813.96:378:34
1913.96:388:33
2013.96:398:33
2113.96:408:33
2213.96:418:32
2313.86:428:32
2413.86:428:32
2513.86:438:31
2613.86:448:31
2713.86:458:30
2813.76:468:30
2913.76:478:29
3013.76:488:29
3113.76:498:28

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 7.32 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 — January's 7.32 kWh/m² sits near the top of that range.

02468151015202531
Solar energy (kWh/m²)Level
17.5Intense
27.4Intense
37.4Intense
47.4Intense
57.4Intense
67.4Intense
77.4Intense
87.3Intense
97.3Intense
107.3Intense
117.3Intense
127.3Intense
137.3Intense
147.3Intense
157.3Intense
167.3Intense
177.3Intense
187.3Intense
197.3Intense
207.3Intense
217.3Intense
227.3Intense
237.3Intense
247.3Intense
257.2Intense
267.2Intense
277.2Intense
287.1Intense
297.1Intense
307.1Intense
317.0Intense
Planning a trip in January

Hazard calendar for San Luis

In seasonPeak

In January, San Luis sits inside its rainy season season. The full year is below, with each hazard's peak months called out.

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 January a good time to visit San Luis?

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

5.3
Sightseeing
12th-best month of the year
6.8
Beach & pool
2nd-best month of the year

January is a reasonable time to visit San Luis for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for San Luis in January

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

In January, San Luis sees daytime highs around 29°C and nights near 18°C. Pack light clothes and sun protection. Worth having: rain gear. About 13 days see rain.

light clothessun protectionrain gear

UV index in San Luis in January

LowModerateHighVery highExtreme

Clear-sky midday UV in January peaks around 14 (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 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
January 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).