Callao weather in December

In December, Callao sees average daytime highs of 20°C and overnight lows near 19°C, with 3 mm of rain across 0.6 wet days and about 12.7 hours of daylight. It is the 5th-warmest and 9th-wettest month of the year here.

Highs climb over the month, from about 19°C in the first days to 21°C by the end. The sky is clear or mostly clear about 8% of the time in December, and the air most often feels humid.

Daylight stretches from about 12 h 42 min at the start of December to 12 h 42 min by month's end. Set against the rest of the year, December is Callao's 10th-clearest and 8th-windiest month. For the whole year in context, see Callao's year-round climate.

Daytime high
20°
5th warmest
Overnight low
19°
8th coldest
Rainfall
3 mm
0.6 wet days
Daylight
12 h 42 min
5:44 AM – 6:26 PM
Cloud cover
78%
10th clearest
Wind
17 km/h
8th windiest
Solar energy
6.65 kWh/m²
Travel score
7.1
out of 10

Callao is city and main seaport of Peru.

Air quality
High
PM2.5 25.5 µg/m³ · 2016
Density
8,343/km²
people per km²
Founded
1537

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

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 19°C in the first days to 21°C by the end.

A typical December day in Callao reaches about 20°C in the afternoon and slips back to 19°C overnight — a 1°C spread between the day's warmth and the night's chill. On most days the high lands between 19°C and 21°C. Set against its neighbours, December runs about 2°C warmer than November and about 2°C cooler than January.

15°18°20°23°25°151015202531
Avg high (°C)Avg low (°C)
11918
21918
31918
41918
51918
61918
71918
81918
91918
101918
111918
122018
132018
142018
152018
162018
172019
182019
192019
202019
212019
222019
232019
242019
252019
262019
272119
282119
292119
302119
312119

Callao weather by month

How December compares with the rest of the year at a glance. December is the 5th-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan22° / 20°51.512.67.4
Feb23° / 21°8212.47.4
Mar22° / 21°61.712.17.4
Apr20° / 19°20.211.77.4
May19° / 18°20.211.57.1
Jun18° / 17°51.111.36.5
Jul17° / 16°51.211.46.1
Aug16° / 15°51.211.66.0
Sep16° / 15°40.511.96.0
Oct17° / 16°30.312.36.2
Nov18° / 17°20.112.66.9
Dec20° / 19°30.612.77.1

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 8% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 12% of December, with mostly cloudy or overcast conditions the remaining 79%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
12377
22377
32476
42476
52377
62377
72377
82377
92278
102278
112278
122278
132179
142080
152080
162080
172080
181981
191981
201981
211981
221981
231981
241981
251981
262080
272080
282080
291981
301981
311981

Chance of precipitation in December

Any precipitation

Callao gets around 3 mm of rain over 0.6 wet days in December. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 2% and peaks near 3% on the wettest days.

0%10%20%30%151015202531
Rain chance (%)
11
21
31
41
51
61
71
81
91
101
111
122
132
142
152
162
172
182
192
203
213
223
233
243
253
263
272
282
292
302
312

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, December lands in the humid band about 74% of days. Sticky, muggy-or-worse air turns up on roughly 26% of them.

0%25%50%75%100%151015202531
Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
169040
259140
349240
439340
529350
619450
719360
819360
909370
1009280
1109190
12090100
13088120
14087130
15085150
16082171
17080191
18077221
19074251
20071281
21067312
22064342
23060382
24056422
25053452
26048493
27044533
28041563
29037603
30033643
31030673

Wind in December

Winds average 17 km/h in December.

Across December, daily wind ranges from about 16 km/h on the calmest days to 18 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
118light breeze
218light breeze
317light breeze
417light breeze
517light breeze
617light breeze
717light breeze
817light breeze
917light breeze
1017light breeze
1117light breeze
1217light breeze
1317light breeze
1417light breeze
1517light 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 December

DaylightNight

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

Days grow by about 0 minutes over December. Sunrise moves from 5:39 AM to 5:51 AM, and sunset from 6:18 PM to 6:33 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.75:396:18
212.75:396:19
312.75:396:19
412.75:396:20
512.75:406:20
612.75:406:21
712.75:406:21
812.75:416:22
912.75:416:22
1012.75:416:23
1112.75:426:23
1212.75:426:24
1312.75:426:24
1412.75:436:25
1512.75:436:25
1612.75:446:26
1712.75:446:26
1812.75:446:27
1912.75:456:27
2012.75:456:28
2112.75:466:28
2212.75:466:29
2312.75:476:29
2412.75:476:30
2512.75:486:30
2612.75:486:31
2712.75:496:31
2812.75:496:31
2912.75:506:32
3012.75:506:32
3112.75:516:33

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 6.65 kWh/m².

For context, solar energy here swings from a low near 4.37 kWh/m² to a high of 6.75 kWh/m² in November across the year — December's 6.65 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
16.7Intense
26.7Intense
36.7Intense
46.7Intense
56.7Intense
66.7Intense
76.7Intense
86.7Intense
96.7Intense
106.7Intense
116.7Intense
126.7Intense
136.7Intense
146.7Intense
156.6Intense
166.6Intense
176.6Intense
186.6Intense
196.6Intense
206.6Intense
216.6Intense
226.6Intense
236.6Intense
246.6Intense
256.6Intense
266.6Intense
276.6Intense
286.6Intense
296.6Intense
306.6Intense
316.6Intense
Planning a trip in December

Is December a good time to visit Callao?

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

7.1
Sightseeing
5th-best month of the year
3.6
Beach & pool
5th-best month of the year

December is one of the better times to visit Callao for general sightseeing.

What to pack for Callao in December

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

In December, Callao sees daytime highs around 20°C and nights near 19°C. Pack sun protection.

sun protection

Sea temperature near Callao in December

The nearest coast averages about 19°C in December — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea offshore is warmest in February at about 22°C and coldest in September near 17°C.

It's comfortable for a long swim from Jan 1 to Apr 9 — about 3.3 months when the water holds above 20°C.

16°18°20°22°JanFebMarAprMayJunJulAugSepOctNovDeccoolrefreshingcomfortable to swim
Sea temperature (°C)Comfort
Jan21Refreshing
Feb22Refreshing
Mar21Refreshing
Apr20Cool
May19Cool
Jun18Cool
Jul18Cool
Aug17Cool
Sep17Cool
Oct17Cool
Nov18Cool
Dec19Cool

UV index in Callao in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 13 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Callao peaks around February 12 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 22 at about 8 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highExtremeFeb 12UV 15Jun 22UV 8
UV index (midday)Level
Jan14Extreme
Feb16Extreme
Mar13Extreme
Apr12Extreme
May10Very high
Jun8Very high
Jul8Very high
Aug10Extreme
Sep10Extreme
Oct13Extreme
Nov12Extreme
Dec13Extreme

Air quality in Callao in December

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in Callao is worst in March — around 30 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.

Seasonal pattern from CAMS reanalysis, scaled to Callao's WHO annual average of 25.5 µg/m³.

010203040JanFebMarAprMayJunJulAugSepOctNovDecModerateMar 2030 µg/m³Nov 2022 µg/m³
PM2.5 (µg/m³)Level
Jan22Moderate
Feb27Moderate
Mar30Moderate
Apr28Moderate
May29Moderate
Jun28Moderate
Jul26Moderate
Aug25Moderate
Sep23Moderate
Oct23Moderate
Nov22Moderate
Dec22Moderate
Location & terrain

Where is Callao?

Callao sits at 12.1°S, 77.1°W, 5 m above sea level, in Peru. The nearest listed city is Carmen De La Legua Reynoso, 4.0 km away.

Topography around Callao

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

Within 3 km, the terrain around Callao has only modest variations in elevation — a maximum elevation change of 43 m around an average of 10 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 737 m; within 80 km, extreme variations in elevation — a maximum elevation change of 4,870 m.

The land around Callao is covered by artificial surfaces (54%) and water (33%) within 3 km, water (60%) and artificial surfaces (30%) within 16 km, and water (50%) and bare terrain (29%) within 80 km.

3 km
43 m
16 km
737 m
80 km
4,870 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
December weather nearby: Carmen De La Legua Reynoso 4.0 km · Breña 9.0 km · Jesus Maria 10 km · San Isidro 11 km · Lima 12 km · Miraflores 13 km · San Francisco De Borja 15 km · Barranco 16 km

Peru travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type A / B / C
220 V · 60 Hz
Prices
≈ 51% of US
price level, 2025
GDP per capita
$9,684
2025
Happiness
6.0 / 10
World Happiness, 2025
Safe drinking water
49%
of population, 2024
Homicide rate
8.6
per 100k, 2021
Road deaths
13.6
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
Moderate
EF EPI 519
Religion
Catholic 76%Evangelical Christian 16%no religion 5%other religions 3%

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 Callao (-12.0516°, -77.1345°, elevation 5 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. 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).