Juan José Castelli weather in January

In January, Juan José Castelli sees average daytime highs of 33°C and overnight lows near 23°C, with 124 mm of rain across 11.2 wet days and about 13.4 hours of daylight. It is the 1st-warmest and 5th-wettest month of the year here.

Day-to-day highs hold fairly steady near 33°C through the month. The sky is clear or mostly clear about 42% of the time in January, and the air most often feels oppressive.

Daylight stretches from about 13 h 36 min at the start of January to 13 h 12 min by month's end. Set against the rest of the year, January is Juan José Castelli's 7th-clearest and 8th-windiest month. For the whole year in context, see Juan José Castelli's year-round climate.

Daytime high
33°
1st warmest
Overnight low
23°
12th coldest
Rainfall
124 mm
11.2 wet days
Daylight
13 h 30 min
6:28 AM – 7:56 PM
Cloud cover
52%
7th clearest
Wind
10 km/h
8th windiest
Solar energy
6.71 kWh/m²
Travel score
3.3
out of 10

Juan José Castelli is human settlement.

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 33°C through the month.

A typical January day in Juan José Castelli reaches about 33°C in the afternoon and slips back to 23°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 29°C and 38°C. Set against its neighbours, January runs about 1°C warmer than December and about 1°C warmer than February.

15°20°25°30°35°40°151015202531
Avg high (°C)Avg low (°C)
13423
23423
33423
43423
53423
63423
73423
83423
93423
103423
113423
123423
133423
143423
153323
163323
173323
183322
193322
203322
213322
223322
233322
243322
253322
263322
273322
283322
293322
303322
313322

How January really feels in Juan José Castelli

Once humidity and wind are folded in, January 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 January is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Juan José Castelli weather by month

How January compares with the rest of the year at a glance. January is the 1st-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan33° / 23°12411.213.43.3
Feb32° / 22°13711.112.93.8
Mar30° / 21°13711.112.24.8
Apr27° / 18°1179.311.46.5
May24° / 14°627.810.77.2
Jun22° / 13°436.810.47.1
Jul22° / 11°315.810.57.6
Aug25° / 13°404.511.18.1
Sep28° / 15°586.711.87.0
Oct30° / 18°1201012.65.2
Nov31° / 20°14010.113.34.6
Dec33° / 22°13511.113.63.6

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 42% of the time in January.

Beyond those clear spells, partly cloudy skies cover about 14% of January, with mostly cloudy or overcast conditions the remaining 43%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15446
25446
35446
45446
55545
65644
75743
85743
95743
105842
115842
125842
135941
145941
155842
165842
175842
185842
195842
205842
215842
225743
235743
245743
255743
265644
275644
285545
295545
305545
315644

Chance of precipitation in January

Any precipitation

Juan José Castelli gets around 124 mm of rain over 11.2 wet days in January. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 37% and peaks near 40% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
136
236
335
435
534
634
734
833
933
1033
1133
1234
1334
1435
1535
1636
1737
1838
1938
2039
2139
2239
2339
2440
2540
2640
2740
2840
2939
3039
3139

Humidity in January

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, January lands in the oppressive band about 43% of days. Sticky, muggy-or-worse air turns up on roughly 77% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1191526418
2181526419
3181526419
4181526419
5181526409
6181527409
7281527399
8281528399
9271628399
10271628389
11271629388
12271629398
13261629398
14261629408
15261628408
16251628418
17251628427
18251627437
19251627437
20251626447
21251626456
22251626466
23251526476
24151526475
25141527485
26141427495
27141427495
28141427495
29141427495
30141428485
31141428485

Wind in January

Winds average 10 km/h in January.

Across January, daily wind ranges from about 10 km/h on the calmest days to 11 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
111calm
211calm
311calm
411calm
511calm
611calm
711calm
811calm
911calm
1011calm
1111calm
1210calm
1310calm
1410calm
1510calm
1610calm
1710calm
1810calm
1910calm
2010calm
2110calm
2210calm
2310calm
2410calm
2510calm
2610calm
2710calm
2810calm
2910calm
3011calm
3111calm

Sunrise & sunset in January

DaylightNight

Daylight runs from about 13 h 36 min at the start of January to 13 h 12 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 24 minutes over January. Sunrise moves from 6:18 AM to 6:39 AM, and sunset from 7:54 PM to 7:52 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.66:187:54
213.66:187:54
313.66:197:54
413.66:207:54
513.66:207:55
613.66:217:55
713.66:227:55
813.56:227:55
913.56:237:55
1013.56:247:55
1113.56:247:55
1213.56:257:55
1313.56:267:56
1413.56:277:56
1513.56:277:56
1613.56:287:56
1713.46:297:55
1813.46:297:55
1913.46:307:55
2013.46:317:55
2113.46:327:55
2213.46:327:55
2313.46:337:55
2413.36:347:55
2513.36:357:54
2613.36:357:54
2713.36:367:54
2813.36:377:53
2913.36:387:53
3013.26:387:53
3113.26:397:52

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 6.71 kWh/m².

For context, solar energy here swings from a low near 2.67 kWh/m² to a high of 6.73 kWh/m² in December across the year — January's 6.71 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
16.8Intense
26.8Intense
36.8Intense
46.8Intense
56.8Intense
66.8Intense
76.8Intense
86.8Intense
96.8Intense
106.8Intense
116.8Intense
126.8Intense
136.8Intense
146.8Intense
156.7Intense
166.7Intense
176.7Intense
186.7Intense
196.7Intense
206.6Intense
216.6Intense
226.6Intense
236.6Intense
246.6Intense
256.5Intense
266.5Intense
276.5Intense
286.5Intense
296.5Intense
306.4Intense
316.4Intense
Planning a trip in January

Is January a good time to visit Juan José Castelli?

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

3.3
Sightseeing
12th-best month of the year
6.0
Beach & pool
9th-best month of the year

January is a weaker month for outdoor sightseeing in Juan José Castelli. The water and warmth also suit a beach or pool day.

What to pack for Juan José Castelli in January

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

In January, Juan José Castelli sees daytime highs around 33°C and nights near 23°C. Pack light clothes and sun protection. Worth having: rain gear. About 11 days see rain.

light clothessun protectionrain gear

UV index in Juan José Castelli in January

LowModerateHighVery highExtreme

Clear-sky midday UV in January peaks around 15 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Juan José Castelli peaks around January 18 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 11 at about 5 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highHighModerateHighVery highExtremeJan 18UV 14Jul 11UV 5
UV index (midday)Level
Jan15Extreme
Feb14Extreme
Mar12Extreme
Apr9Very high
May6High
Jun5Moderate
Jul5Moderate
Aug6High
Sep8Very high
Oct7High
Nov12Extreme
Dec14Extreme

Air quality in Juan José Castelli in January

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where January falls, not just the annual average.

Air quality in Juan José Castelli is worst in August — around 31 µg/m³ PM2.5 (moderate), about 5.1× the cleanest month (April, 6 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodAug 2330 µg/m³Apr 236 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb10Good
Mar8Good
Apr6Good
May6Good
Jun7Good
Jul15Moderate
Aug31Moderate
Sep29Moderate
Oct18Moderate
Nov10Good
Dec9Good
Location & terrain

Where is Juan José Castelli?

Juan José Castelli sits at 25.9°S, 60.6°W, 113 m above sea level, in Argentina. The nearest listed city is Tres Isletas, 48 km away.

Topography around Juan José Castelli

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

Within 3 km, the terrain around Juan José Castelli has only modest variations in elevation — a maximum elevation change of 9 m around an average of 110 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 20 m; within 80 km, only modest variations in elevation — a maximum elevation change of 64 m.

The land around Juan José Castelli is covered by cropland (30%), artificial surfaces (29%) and grassland (22%) within 3 km, trees (56%) and cropland (30%) within 16 km, and trees (75%) within 80 km.

3 km
9 m
16 km
20 m
80 km
64 m
treesshrubsgrasslandcroplandartificial surfaces
January weather nearby: Tres Isletas 48 km · Presidencia Roque Sáenz Peña 96 km · Quitilipi 110 km · Machagai 123 km · Las Breñas 135 km · General José de San Martín 143 km · Charata 152 km · Pirané 153 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 Juan José Castelli (-25.9466°, -60.6201°, elevation 113 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).