Itatiaia weather in December

In December, Itatiaia sees average daytime highs of 26°C and overnight lows near 18°C, with 380 mm of rain across 25.2 wet days and about 13.4 hours of daylight. It is the 4th-warmest and 2nd-wettest month of the year here.

Day-to-day highs hold fairly steady near 26°C through the month. The sky is clear or mostly clear about 9% of the time in December, and the air most often feels muggy.

Daylight stretches from about 13 h 18 min at the start of December to 13 h 24 min by month's end. Set against the rest of the year, December is Itatiaia's 10th-clearest and 6th-windiest month. For the whole year in context, see Itatiaia's year-round climate.

Daytime high
26°
4th warmest
Overnight low
18°
10th coldest
Rainfall
380 mm
25.2 wet days
Daylight
13 h 24 min
6:13 AM – 7:36 PM
Cloud cover
77%
10th clearest
Wind
5 km/h
6th windiest
Solar energy
5.36 kWh/m²
Travel score
4.2
out of 10

Itatiaia is human settlement in Brazil.

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

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 26°C through the month.

A typical December day in Itatiaia reaches about 26°C in the afternoon and slips back to 18°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 22°C and 30°C. Set against its neighbours, December runs about 1°C warmer than November and on par with January.

15°20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
12618
22618
32618
42618
52618
62618
72618
82618
92618
102618
112618
122618
132618
142618
152618
162618
172618
182618
192718
202718
212718
222718
232718
242718
252718
262719
272719
282719
292719
302719
312719

Itatiaia weather by month

How December compares with the rest of the year at a glance. December is the 4th-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan27° / 19°40424.913.24.2
Feb27° / 18°3072012.84.6
Mar26° / 18°30722.712.24.7
Apr25° / 16°13215.111.56.0
May23° / 14°7711.210.96.7
Jun22° / 12°457.710.67.3
Jul22° / 12°457.410.87.3
Aug23° / 12°477.511.27.5
Sep24° / 14°11513.711.96.4
Oct25° / 16°19419.112.55.3
Nov25° / 17°31022.613.14.6
Dec26° / 18°38025.213.44.2

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 9% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 13% of December, with mostly cloudy or overcast conditions the remaining 78%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
12179
22179
32179
42179
52080
61981
71981
82080
92080
102179
112179
122278
132278
142377
152377
162377
172377
182377
192575
202575
212575
222674
232575
242575
252575
262377
272377
282377
292377
302278
312278

Chance of precipitation in December

Any precipitation

Itatiaia gets around 380 mm of rain over 25.2 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 81% and peaks near 85% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%100%151015202531
Rain chance (%)
175
276
376
476
577
677
778
878
979
1079
1179
1280
1380
1481
1581
1682
1782
1883
1983
2083
2184
2284
2384
2484
2585
2685
2785
2885
2985
3085
3185

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, December lands in the muggy band about 59% of days. Sticky, muggy-or-worse air turns up on roughly 59% of them.

0%25%50%75%100%151015202531
Comfortable (%)Humid (%)Muggy (%)
1104743
294644
384546
484448
574449
674350
764252
864153
954055
1053956
1143957
1243858
1343858
1433760
1533760
1633760
1733661
1833661
1933661
2033562
2133562
2233463
2333364
2433364
2533265
2633166
2733166
2833067
2933067
3022969
3122969

Wind in December

Winds average 5 km/h in December.

Across December, daily wind ranges from about 4 km/h on the calmest days to 5 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
184calm
194calm
204calm
214calm
224calm
234calm
244calm
254calm
264calm
274calm
284calm
294calm
304calm
314calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 13 h 18 min at the start of December to 13 h 24 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 6 minutes over December. Sunrise moves from 6:10 AM to 6:21 AM, and sunset from 7:26 PM to 7:42 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.36:107:26
213.36:107:27
313.36:107:28
413.36:107:28
513.36:107:29
613.36:107:30
713.36:117:30
813.36:117:31
913.36:117:31
1013.36:117:32
1113.46:127:33
1213.46:127:33
1313.46:127:34
1413.46:137:34
1513.46:137:35
1613.46:137:36
1713.46:147:36
1813.46:147:37
1913.46:157:37
2013.46:157:38
2113.46:157:38
2213.46:167:39
2313.46:167:39
2413.46:177:40
2513.46:177:40
2613.46:187:40
2713.46:187:41
2813.46:197:41
2913.46:197:42
3013.46:207:42
3113.46:217:42

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 5.36 kWh/m².

For context, solar energy here swings from a low near 3.55 kWh/m² to a high of 5.52 kWh/m² in February across the year — December's 5.36 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.3Bright
25.3Bright
35.3Bright
45.3Bright
55.3Bright
65.3Bright
75.3Bright
85.3Bright
95.3Bright
105.3Bright
115.3Bright
125.3Bright
135.3Bright
145.3Bright
155.3Bright
165.3Bright
175.3Bright
185.4Bright
195.4Bright
205.4Bright
215.4Bright
225.4Bright
235.4Bright
245.4Bright
255.3Bright
265.3Bright
275.3Bright
285.3Bright
295.3Bright
305.3Bright
315.3Bright
Planning a trip in December

Hazard calendar for Itatiaia

In seasonPeak

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

Itatiaia's rainy season runs October–March, when most of the year's rain falls.

Rainy season
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is December a good time to visit Itatiaia?

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

4.2
Sightseeing
11th-best month of the year
4.1
Beach & pool
12th-best month of the year

December is a reasonable time to visit Itatiaia for sightseeing.

What to pack for Itatiaia in December

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

In December, Itatiaia sees daytime highs around 26°C and nights near 18°C. Pack rain gear. Worth having: light clothes and sun protection. About 25 days see rain.

rain gearlight clothessun protection

Sea temperature near Itatiaia in December

The nearest coast averages about 25°C in December — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 70 km away) is warmest in February at about 27°C and coldest in August near 21°C.

The water stays above 20°C all year — warm enough for a swim any month.

20°22°24°26°28°JanFebMarAprMayJunJulAugSepOctNovDeccoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan27Warm
Feb27Warm
Mar27Warm
Apr26Warm
May24Warm
Jun23Refreshing
Jul22Refreshing
Aug21Refreshing
Sep22Refreshing
Oct23Refreshing
Nov23Refreshing
Dec25Warm

UV index in Itatiaia in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December 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 Itatiaia peaks around February 9 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 11 at about 6 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highHighVery highExtremeFeb 9UV 15Jul 11UV 6
UV index (midday)Level
Jan15Extreme
Feb15Extreme
Mar13Extreme
Apr10Very high
May7Very high
Jun6High
Jul6High
Aug8Very high
Sep7Very high
Oct12Extreme
Nov14Extreme
Dec14Extreme

Air quality in Itatiaia 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 Itatiaia is worst in September — around 33 µg/m³ PM2.5 (moderate), about 2.1× the cleanest month (December, 15 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecModerateSep 1332 µg/m³Dec 2115 µg/m³
PM2.5 (µg/m³)Level
Jan16Moderate
Feb16Moderate
Mar17Moderate
Apr19Moderate
May24Moderate
Jun29Moderate
Jul31Moderate
Aug27Moderate
Sep33Moderate
Oct20Moderate
Nov17Moderate
Dec15Moderate
Location & terrain

Where is Itatiaia?

Itatiaia sits at 22.5°S, 44.6°W, 406 m above sea level, in Brazil. The nearest listed city is Resende, 12 km away.

Topography around Itatiaia

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

Within 3 km, the terrain around Itatiaia has significant variations in elevation — a maximum elevation change of 253 m around an average of 452 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 2,300 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,761 m.

The land around Itatiaia is covered by grassland (51%) and trees (30%) within 3 km, trees (49%) and grassland (44%) within 16 km, and trees (50%) and grassland (42%) within 80 km.

3 km
253 m
16 km
2,300 m
80 km
2,761 m
treesgrasslandcroplandartificial surfacesbare terrainwater
December weather nearby: Resende 12 km · Porto Real 29 km · Barra Mansa 41 km · Cruzeiro 43 km · Passa Quatro 43 km · Itanhandu 44 km · Volta Redonda 47 km · Cachoeira Paulista 50 km

Brazil travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / N
127 / 220 V · 60 Hz
Prices
≈ 46% of US
price level, 2025
GDP per capita
$10,713
2025
Happiness
6.6 / 10
World Happiness, 2025
Safe drinking water
89%
of population, 2024
Homicide rate
19.3
per 100k, 2023
Road deaths
16
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
Low
EF EPI 482
Religion
Roman Catholic 57%Evangelical 27%none 9%other 4%

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 Itatiaia (-22.4961°, -44.5633°, elevation 406 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).