Ilha Grande weather in December

In December, Ilha Grande sees average daytime highs of 29°C and overnight lows near 26°C, with 34 mm of rain across 7.7 wet days and about 12.2 hours of daylight. It is the 7th-warmest and 7th-wettest month of the year here.

Day-to-day highs hold fairly steady near 29°C through the month. The sky is clear or mostly clear about 43% of the time in December, and the air most often feels oppressive.

Daylight stretches from about 12 h 12 min at the start of December to 12 h 12 min by month's end. Set against the rest of the year, December is Ilha Grande's 7th-clearest and 5th-windiest month. For the whole year in context, see Ilha Grande's year-round climate.

Daytime high
29°
7th warmest
Overnight low
26°
12th coldest
Rainfall
34 mm
7.7 wet days
Daylight
12 h 12 min
5:39 AM – 5:48 PM
Cloud cover
50%
7th clearest
Wind
27 km/h
5th windiest
Solar energy
6.24 kWh/m²
Travel score
5.9
out of 10

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 29°C through the month.

A typical December day in Ilha Grande reaches about 29°C in the afternoon and slips back to 26°C overnight — a 3°C spread between the day's warmth and the night's chill. On most days the high lands between 28°C and 30°C. Set against its neighbours, December runs on par with November and on par with January.

24°26°28°30°32°151015202531
Avg high (°C)Avg low (°C)
12926
22926
32926
42926
52926
62926
72926
82926
92926
102926
112926
122926
132926
142926
152926
162926
172926
182926
192926
202926
212926
222926
232926
242926
252926
262926
272926
282926
292926
302926
312926

How December really feels in Ilha Grande

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

Ilha Grande weather by month

How December compares with the rest of the year at a glance. December is the 7th-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan28° / 26°14621.312.14.3
Feb28° / 26°21123.712.13.9
Mar28° / 25°32328.3123.7
Apr28° / 26°34327.311.93.5
May29° / 26°17820.711.94.3
Jun29° / 26°5111.311.85.5
Jul29° / 26°224.311.96.5
Aug30° / 26°20.411.97.0
Sep29° / 26°10.2127.2
Oct29° / 26°60.812.17.1
Nov29° / 26°71.612.16.8
Dec29° / 26°347.712.25.9

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 43% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 18% of December, with mostly cloudy or overcast conditions the remaining 39%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16733
26733
36733
46733
56733
66634
76634
86634
96634
106634
116535
126535
136535
146436
156436
166238
176238
186139
196139
206040
215941
225842
235842
245743
255644
265545
275446
285446
295248
305149
315050

Chance of precipitation in December

Any precipitation

Ilha Grande gets around 34 mm of rain over 7.7 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 25% and peaks near 49% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)
19
210
310
411
512
612
713
814
915
1016
1117
1218
1320
1421
1522
1623
1725
1826
1928
2030
2131
2233
2334
2436
2538
2640
2741
2843
2945
3047
3149

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, December lands in the oppressive band about 84% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Oppressive (%)Miserable (%)
1937
2928
3928
4928
5928
6919
7919
89010
99010
108911
118812
128713
138614
148515
158416
168317
178317
188218
198119
208020
217921
227822
237723
247723
257624
267624
277624
287525
297525
307525
317624

Wind in December

Winds average 27 km/h in December.

Across December, daily wind ranges from about 24 km/h on the calmest days to 28 km/h at its breeziest. It stays fairly steady from day to day.

0102030151015202531
Wind speed (km/h)Feels
128breezy
228breezy
328breezy
428breezy
528breezy
628breezy
728breezy
828breezy
928breezy
1027breezy
1127breezy
1227breezy
1327breezy
1427breezy
1527breezy
1627breezy
1727breezy
1827breezy
1926breezy
2026breezy
2126breezy
2226breezy
2326breezy
2426breezy
2525breezy
2625breezy
2725breezy
2825breezy
2925breezy
3024breezy
3124breezy

Sunrise & sunset in December

DaylightNight

Daylight runs from about 12 h 12 min at the start of December to 12 h 12 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 5:32 AM to 5:46 AM, and sunset from 5:42 PM to 5:55 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.25:325:42
212.25:335:42
312.25:335:42
412.25:335:43
512.25:345:43
612.25:345:44
712.25:355:44
812.25:355:45
912.25:355:45
1012.25:365:46
1112.25:365:46
1212.25:375:46
1312.25:375:47
1412.25:385:47
1512.25:385:48
1612.25:395:48
1712.25:395:49
1812.25:395:49
1912.25:405:50
2012.25:405:50
2112.25:415:51
2212.25:415:51
2312.25:425:52
2412.25:425:52
2512.25:435:53
2612.25:435:53
2712.25:445:54
2812.25:445:54
2912.25:455:54
3012.25:455:55
3112.25:465:55

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 6.24 kWh/m².

For context, solar energy here swings from a low near 4.98 kWh/m² to a high of 7.04 kWh/m² in October across the year — December's 6.24 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
16.5Intense
26.5Intense
36.5Intense
46.5Intense
56.5Intense
66.5Intense
76.5Intense
86.4Intense
96.4Intense
106.4Intense
116.4Intense
126.3Intense
136.3Intense
146.3Intense
156.3Intense
166.2Intense
176.2Intense
186.2Intense
196.1Intense
206.1Intense
216.1Intense
226.1Intense
236.0Intense
246.0Intense
256.0Intense
266.0Intense
276.0Bright
286.0Bright
295.9Bright
305.9Bright
315.9Bright
Planning a trip in December

Hazard calendar for Ilha Grande

In seasonPeak

None of Ilha Grande's seasonal hazards are active in December. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Ilha Grande's monsoon runs February–May, when most of the year's rain falls.

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

Is December a good time to visit Ilha Grande?

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

5.9
Sightseeing
6th-best month of the year
7.5
Beach & pool
6th-best month of the year

December is a reasonable time to visit Ilha Grande for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Ilha Grande in December

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

In December, Ilha Grande sees daytime highs around 29°C and nights near 26°C. Pack light clothes and sun protection. Worth having: a windbreaker. About 8 days see rain.

light clothessun protectiona windbreaker

Sea temperature near Ilha Grande in December

The nearest coast averages about 28°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 21 km away) is warmest in May at about 29°C and coldest in September near 27°C.

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

26°28°30°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan28Tropical
Feb28Tropical
Mar29Tropical
Apr29Tropical
May29Tropical
Jun29Tropical
Jul28Warm
Aug27Warm
Sep27Warm
Oct27Warm
Nov28Warm
Dec28Tropical

UV index in Ilha Grande in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December 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 Ilha Grande peaks around March 17 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 14 at about 10 (extreme).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeMar 17UV 15Jul 14UV 10
UV index (midday)Level
Jan13Extreme
Feb14Extreme
Mar16Extreme
Apr14Extreme
May12Extreme
Jun10Extreme
Jul10Extreme
Aug10Extreme
Sep12Extreme
Oct12Extreme
Nov11Extreme
Dec11Extreme

Air quality in Ilha Grande 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 Ilha Grande is worst in December — around 18 µg/m³ PM2.5 (moderate), about 3.0× the cleanest month (August, 6 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateDec 1217 µg/m³Aug 216 µg/m³
PM2.5 (µg/m³)Level
Jan12Moderate
Feb15Moderate
Mar13Moderate
Apr11Good
May8Good
Jun7Good
Jul9Good
Aug6Good
Sep7Good
Oct10Good
Nov16Moderate
Dec18Moderate
Location & terrain

Where is Ilha Grande?

Ilha Grande sits at 2.9°S, 41.8°W, 0 m above sea level, in Brazil. The nearest listed city is Parnaíba, 7.0 km away.

Topography around Ilha Grande

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

Within 3 km, the terrain around Ilha Grande has only modest variations in elevation — a maximum elevation change of 24 m around an average of 4 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 45 m; within 80 km, large variations in elevation — a maximum elevation change of 656 m.

The land around Ilha Grande is covered by grassland (49%) and trees (22%) within 3 km, grassland (32%) within 16 km, and trees (38%) and water (35%) within 80 km.

3 km
24 m
16 km
45 m
80 km
656 m
treesshrubsgrasslandartificial surfacesbare terrainwaterwetlandmangroves
December weather nearby: Parnaíba 7.0 km · Araioses 10 km · Luís Correia 17 km · Buriti dos Lopes 36 km · Tutóia 52 km · Cocal 75 km · Paulino Neves 81 km · São Bernardo 88 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 Ilha Grande (-2.8521°, -41.8169°, elevation 0 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).