Castro weather in January

In January, Castro sees average daytime highs of 20°C and overnight lows near 10°C, with 63 mm of rain across 9.8 wet days and about 14.8 hours of daylight. It is the 2nd-warmest and 11th-wettest month of the year here.

Day-to-day highs hold fairly steady near 20°C through the month. The sky is clear or mostly clear about 24% of the time in January, and the air most often feels dry.

Daylight stretches from about 15 h 06 min at the start of January to 14 h 18 min by month's end. Set against the rest of the year, January is Castro's 2nd-clearest and 9th-windiest month. For the whole year in context, see Castro's year-round climate.

Daytime high
20°
2nd warmest
Overnight low
10°
11th coldest
Rainfall
63 mm
9.8 wet days
Daylight
14 h 48 min
6:41 AM – 9:28 PM
Cloud cover
62%
2nd clearest
Wind
10 km/h
9th windiest
Solar energy
6.04 kWh/m²
Travel score
6.2
out of 10

Castro is Chilean city.

Density
2,926/km²
people per km²
Founded
1567

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 20°C through the month.

A typical January day in Castro reaches about 20°C in the afternoon and slips back to 10°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 16°C and 24°C. Set against its neighbours, January runs about 2°C warmer than December and on par with February.

10°15°20°25°151015202531
Avg high (°C)Avg low (°C)
11910
21910
31910
41910
51910
61910
71910
81910
91910
101910
111910
121910
132010
142010
152010
162010
172010
182010
192010
202010
212010
222010
232010
242010
252010
262010
272010
282010
292010
302010
312010

Castro weather by month

How January compares with the rest of the year at a glance. January is the 2nd-warmest and 11th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan20° / 10°639.814.86.2
Feb20° / 10°568.313.76.4
Mar18° / 8611.512.45.6
Apr15° / 11213.610.94.0
May12° / 17217.39.62.7
Jun10° / 19219.38.91.8
Jul10° / 17417.99.21.8
Aug11° / 19619.910.32.0
Sep12° / 13016.211.72.8
Oct14° / 12416.313.23.5
Nov16° / 9813.414.44.4
Dec18° / 8212.615.15.4

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 24% of the time in January.

Beyond those clear spells, partly cloudy skies cover about 15% of January, with mostly cloudy or overcast conditions the remaining 61%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13070
23070
33169
43268
53268
63268
73367
83466
93466
103565
113763
123763
133862
143961
154060
164258
174258
184357
194456
204456
214456
224456
234456
244456
254456
264456
274357
284357
294456
304456
314456

Chance of precipitation in January

Any precipitation

Castro gets around 63 mm of rain over 9.8 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 32% and peaks near 38% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%50%151015202531
Rain chance (%)
138
238
337
437
536
636
735
835
934
1034
1133
1232
1332
1431
1531
1630
1730
1829
1929
2029
2129
2229
2330
2430
2530
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 90% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)
1937
2937
3937
4937
5937
6937
7937
8937
9937
10928
11928
12919
13919
149010
159010
168911
178911
188812
198812
208812
218812
228812
238812
248812
258812
268812
278812
288911
298911
309010
319010

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 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 January

DaylightNight

Daylight runs from about 15 h 06 min at the start of January to 14 h 18 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 48 minutes over January. Sunrise moves from 6:26 AM to 6:59 AM, and sunset from 9:30 PM to 9:18 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
115.16:269:30
215.16:279:30
315.06:289:30
415.06:299:30
515.06:309:30
615.06:319:30
715.06:319:30
815.06:329:30
914.96:339:30
1014.96:349:30
1114.96:359:30
1214.96:369:29
1314.96:379:29
1414.86:399:29
1514.86:409:28
1614.86:419:28
1714.86:429:28
1814.76:439:27
1914.76:449:27
2014.76:459:26
2114.76:469:26
2214.66:489:25
2314.66:499:24
2414.66:509:24
2514.56:519:23
2614.56:539:22
2714.56:549:21
2814.46:559:21
2914.46:569:20
3014.46:589:19
3114.36:599:18

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 6.04 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 1.16 kWh/m² to a high of 6.04 kWh/m² in January across the year — January's 6.04 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
16.0Bright
26.0Intense
36.0Intense
46.0Intense
56.0Intense
66.0Intense
76.1Intense
86.1Intense
96.1Intense
106.1Intense
116.1Intense
126.1Intense
136.1Intense
146.1Intense
156.1Intense
166.1Intense
176.1Intense
186.1Intense
196.1Intense
206.1Intense
216.1Intense
226.0Intense
236.0Intense
246.0Bright
255.9Bright
265.9Bright
275.9Bright
285.8Bright
295.8Bright
305.8Bright
315.8Bright
Planning a trip in January

Is January a good time to visit Castro?

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

6.2
Sightseeing
2nd-best month of the year
3.0
Beach & pool
2nd-best month of the year

January is a reasonable time to visit Castro for sightseeing.

What to pack for Castro in January

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

In January, Castro sees daytime highs around 20°C and nights near 10°C. Pack sun protection. Worth having: rain gear. About 10 days see rain.

sun protectionrain gear

Sea temperature near Castro in January

The nearest coast averages about 14°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 31 km away) is warmest in January at about 14°C and coldest in August near 11°C.

The water stays below 20°C all year — cool enough that most swimmers want a wetsuit.

10°12°14°16°JanFebMarAprMayJunJulAugSepOctNovDecbracingcool
Sea temperature (°C)Comfort
Jan14Bracing
Feb14Bracing
Mar14Bracing
Apr13Bracing
May12Bracing
Jun12Bracing
Jul11Bracing
Aug11Bracing
Sep11Bracing
Oct11Bracing
Nov12Bracing
Dec13Bracing

UV index in Castro in January

LowModerateHighVery highExtreme

Clear-sky midday UV in January peaks around 11 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Castro peaks around December 23 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 20 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeModerateLowModerateHighVery highExtremeDec 23UV 12Jun 20UV 1
UV index (midday)Level
Jan11Extreme
Feb11Extreme
Mar7High
Apr4Moderate
May2Moderate
Jun1Low
Jul2Low
Aug2Moderate
Sep4Moderate
Oct7High
Nov8Very high
Dec12Extreme
Location & terrain

Where is Castro?

Castro sits at 42.5°S, 73.8°W, 81 m above sea level, in Chile. The nearest listed city is Ancud, 67 km away.

Topography around Castro

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

Within 3 km, the terrain around Castro has significant variations in elevation — a maximum elevation change of 306 m around an average of 69 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 835 m; within 80 km, large variations in elevation — a maximum elevation change of 847 m.

The land around Castro is covered by trees (39%), water (27%) and grassland (20%) within 3 km, trees (54%) and grassland (25%) within 16 km, and water (58%) and trees (34%) within 80 km.

3 km
306 m
16 km
835 m
80 km
847 m
treesgrasslandartificial surfaceswater
January weather nearby: Ancud 67 km · Quellón 73 km · Calbuco 94 km · Maullín 96 km · Puerto Montt 131 km · Puerto Varas 144 km · Llanquihue 149 km · Frutillar 161 km

Chile travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / F / L
220 V · 50 Hz
Prices
≈ 48% of US
price level, 2025
GDP per capita
$17,995
2025
Happiness
6.3 / 10
World Happiness, 2025
Safe drinking water
98%
of population, 2024
Homicide rate
6.3
per 100k, 2023
Road deaths
14.9
per 100k/yr, 2019
Income group
High
World Bank
English
Moderate
EF EPI 517
Religion
Catholic 57%none 26%Evangelical or Protestant 16%other Christians and traditions related to 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 Castro (-42.4721°, -73.7732°, elevation 81 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).