Tres Arroyos weather in January

In January, Tres Arroyos sees average daytime highs of 28°C and overnight lows near 15°C, with 74 mm of rain across 9.7 wet days and about 14.4 hours of daylight. It is the 1st-warmest and 6th-wettest month of the year here.

Day-to-day highs hold fairly steady near 28°C through the month. The sky is clear or mostly clear about 56% of the time in January, and the air most often feels dry.

Daylight stretches from about 14 h 36 min at the start of January to 14 hours by month's end. Set against the rest of the year, January is Tres Arroyos's 1st-clearest and 2nd-windiest month. For the whole year in context, see Tres Arroyos's year-round climate.

Daytime high
28°
1st warmest
Overnight low
15°
12th coldest
Rainfall
74 mm
9.7 wet days
Daylight
14 h 24 min
5:58 AM – 8:22 PM
Cloud cover
39%
1st clearest
Wind
16 km/h
2nd windiest
Solar energy
7.64 kWh/m²
Travel score
6.1
out of 10

Tres Arroyos is city in Buenos Aires Province, Argentina.

Density
3,139/km²
people per km²
Founded
1884

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 28°C through the month.

A typical January day in Tres Arroyos reaches about 28°C in the afternoon and slips back to 15°C overnight — a 13°C spread between the day's warmth and the night's chill. On most days the high lands between 23°C and 34°C. Set against its neighbours, January runs about 2°C warmer than December and about 1°C warmer than February.

10°15°20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
12915
22915
32915
42915
52915
62915
72915
82915
92915
102915
112915
122915
132915
142915
152915
162915
172915
182915
192915
202915
212916
222916
232916
242816
252816
262816
272816
282816
292816
302816
312816

How January really feels in Tres Arroyos

Once humidity and wind are folded in, January averages 0 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
0
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

January sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Tres Arroyos weather by month

How January compares with the rest of the year at a glance. January is the 1st-warmest and 6th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan28° / 15°749.714.46.1
Feb27° / 15°758.313.56.9
Mar25° / 13°768.212.37.4
Apr21° / 10°647.2116.9
May17° / 466.29.95.7
Jun13° / 335.29.44.2
Jul13° / 386.19.63.8
Aug15° / 475.810.54.9
Sep17° / 516.911.75.8
Oct20° / 789.4136.4
Nov23° / 11°839.314.17.1
Dec27° / 14°788.814.66.9

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 56% of the time in January, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 15% of January, with mostly cloudy or overcast conditions the remaining 29%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
17228
27228
37129
47129
57129
67030
77030
87129
97129
107129
117129
127129
137129
147228
157228
167228
177228
187228
197228
207327
217228
227327
237228
247327
257327
267228
277228
287129
297129
307030
316931

Chance of precipitation in January

Any precipitation

Tres Arroyos gets around 74 mm of rain over 9.7 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 31% and peaks near 32% on the wettest days.

0%10%20%30%40%151015202531
Rain chance (%)
132
232
332
432
531
631
731
831
931
1030
1130
1230
1330
1430
1530
1630
1730
1830
1930
2030
2131
2231
2331
2431
2531
2631
2731
2831
2931
3031
3131

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 50% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
15127175
25127175
35127175
45226175
55226175
65326165
75326165
85426164
95525164
105525164
115525164
125525164
135426164
145326174
155326174
165226184
175226184
185126194
195026204
204926204
214826215
224826215
234726225
244627225
254627225
264627225
274527235
284527225
294527225
304627226
314627226

Wind in January

Winds average 16 km/h in January.

Across January, daily wind ranges from about 16 km/h on the calmest days to 17 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
117light breeze
217light breeze
317light breeze
416light breeze
516light breeze
616light breeze
716light breeze
816light breeze
916light breeze
1016light breeze
1116light breeze
1216light breeze
1316light breeze
1416light breeze
1516light breeze
1616light breeze
1716light breeze
1816light breeze
1916light breeze
2016light breeze
2116light breeze
2216light breeze
2316light breeze
2416light breeze
2516light breeze
2616light breeze
2716light breeze
2816light breeze
2916light breeze
3016light breeze
3116light breeze

Sunrise & sunset in January

DaylightNight

Daylight runs from about 14 h 36 min at the start of January to 14 hours by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 36 minutes over January. Sunrise moves from 5:45 AM to 6:14 AM, and sunset from 8:23 PM to 8:14 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.65:458:23
214.65:468:23
314.65:478:23
414.65:488:24
514.65:488:24
614.65:498:24
714.65:508:24
814.55:518:24
914.55:528:24
1014.55:538:24
1114.55:548:23
1214.55:558:23
1314.55:568:23
1414.45:568:23
1514.45:578:23
1614.45:588:22
1714.45:598:22
1814.46:008:22
1914.36:018:21
2014.36:038:21
2114.36:048:20
2214.36:058:20
2314.26:068:20
2414.26:078:19
2514.26:088:18
2614.16:098:18
2714.16:108:17
2814.16:118:17
2914.16:128:16
3014.06:138:15
3114.06:148:14

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 7.64 kWh/m².

For context, solar energy here swings from a low near 1.95 kWh/m² to a high of 7.77 kWh/m² in December across the year — January's 7.64 kWh/m² sits near the top of that range.

02468151015202531
Solar energy (kWh/m²)Level
17.8Intense
27.8Intense
37.8Intense
47.8Intense
57.8Intense
67.8Intense
77.8Intense
87.8Intense
97.8Intense
107.8Intense
117.8Intense
127.8Intense
137.8Intense
147.8Intense
157.7Intense
167.7Intense
177.7Intense
187.7Intense
197.6Intense
207.6Intense
217.6Intense
227.5Intense
237.5Intense
247.4Intense
257.4Intense
267.3Intense
277.3Intense
287.3Intense
297.2Intense
307.2Intense
317.1Intense
Planning a trip in January

Is January a good time to visit Tres Arroyos?

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

6.1
Sightseeing
7th-best month of the year
7.3
Beach & pool
1st-best month of the year

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

What to pack for Tres Arroyos in January

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

In January, Tres Arroyos sees daytime highs around 28°C and nights near 15°C. Pack light clothes and sun protection. Worth having: rain gear. About 10 days see rain.

light clothessun protectionrain gear

Sea temperature near Tres Arroyos in January

The nearest coast averages about 21°C in January — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 56 km away) is warmest in February at about 21°C and coldest in August near 10°C.

It's comfortable for a long swim from Jan 8 to Mar 21 — about 2.4 months when the water holds above 20°C.

10°15°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingcomfortable to swim
Sea temperature (°C)Comfort
Jan21Refreshing
Feb21Refreshing
Mar20Refreshing
Apr18Cool
May15Cool
Jun12Bracing
Jul10Bracing
Aug10Bracing
Sep11Bracing
Oct13Bracing
Nov16Cool
Dec18Cool

UV index in Tres Arroyos in January

LowModerateHighVery highExtreme

Clear-sky midday UV in January peaks around 12 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Tres Arroyos peaks around December 20 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 21 at about 2 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highModerateModerateVery highExtremeDec 20UV 12Jun 21UV 2
UV index (midday)Level
Jan12Extreme
Feb12Extreme
Mar8Very high
Apr6High
May3Moderate
Jun2Low
Jul2Moderate
Aug3Moderate
Sep5Moderate
Oct7Very high
Nov10Very high
Dec13Extreme
Location & terrain

Where is Tres Arroyos?

Tres Arroyos sits at 38.4°S, 60.3°W, 100 m above sea level, in Argentina. The nearest listed city is Benito Juárez, 89 km away.

Topography around Tres Arroyos

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

Within 3 km, the terrain around Tres Arroyos has only modest variations in elevation — a maximum elevation change of 21 m around an average of 109 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 93 m; within 80 km, significant variations in elevation — a maximum elevation change of 268 m.

The land around Tres Arroyos is covered by artificial surfaces (43%) and grassland (41%) within 3 km, cropland (81%) within 16 km, and cropland (61%) and grassland (28%) within 80 km.

3 km
21 m
16 km
93 m
80 km
268 m
treesgrasslandcroplandartificial surfacesbare terrainwater
January weather nearby: Benito Juárez 89 km · Coronel Pringles 104 km · Necochea 135 km · Tandil 154 km · Olavarría 165 km · Punta Alta 166 km · Bahía Blanca 177 km · Coronel Suárez 178 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 Tres Arroyos (-38.3769°, -60.2756°, elevation 100 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. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. 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).