Porto Grande weather in December

In December, Porto Grande sees average daytime highs of 32°C and overnight lows near 23°C, with 104 mm of rain across 19.5 wet days and about 12 hours of daylight. It is the 4th-warmest and 7th-wettest month of the year here.

Highs ease over the month, from about 33°C in the first days to 31°C by the end. The sky is clear or mostly clear about 14% of the time in December, and the air most often feels oppressive.

Daylight stretches from about 12 hours at the start of December to 12 hours by month's end. Set against the rest of the year, December is Porto Grande's 7th-clearest and 4th-windiest month. For the whole year in context, see Porto Grande's year-round climate.

Daytime high
32°
4th warmest
Overnight low
23°
12th coldest
Rainfall
104 mm
19.5 wet days
Daylight
12 hours
6:23 AM – 6:21 PM
Cloud cover
67%
7th clearest
Wind
10 km/h
4th windiest
Solar energy
4.75 kWh/m²
Travel score
3.0
out of 10

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 33°C in the first days to 31°C by the end.

A typical December day in Porto Grande reaches about 32°C in the afternoon and slips back to 23°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 30°C and 35°C. Set against its neighbours, December runs about 2°C cooler than November and about 2°C warmer than January.

20°25°30°35°40°151015202531
Avg high (°C)Avg low (°C)
13423
23423
33323
43323
53323
63323
73323
83323
93323
103323
113323
123323
133323
143223
153223
163223
173223
183223
193223
203223
213223
223223
233223
243223
253123
263123
273123
283123
293123
303123
313123

How December really feels in Porto 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.

Porto Grande weather by month

How December compares with the rest of the year at a glance. December is the 4th-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 23°19327.1122.9
Feb29° / 23°23924.9123.0
Mar30° / 23°25627.1123.0
Apr30° / 23°27128122.8
May30° / 23°24528.6122.8
Jun30° / 22°12725123.1
Jul31° / 22°9321.6123.5
Aug32° / 23°4212123.9
Sep34° / 23°174.3123.6
Oct35° / 23°153.4123.1
Nov34° / 23°316.6123.0
Dec32° / 23°10419.5123.0

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 14% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 24% of December, with mostly cloudy or overcast conditions the remaining 61%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15347
25347
35248
45149
55149
65050
74951
84852
94753
104753
114654
124555
134357
144159
154159
164060
173862
183763
193466
203367
213268
223169
232971
242971
252872
262773
272674
282674
292575
302575
312377

Chance of precipitation in December

Any precipitation

Porto Grande gets around 104 mm of rain over 19.5 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 62% 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 (%)
135
236
338
440
541
643
745
847
949
1051
1153
1256
1358
1460
1562
1664
1766
1868
1970
2072
2173
2275
2377
2478
2579
2681
2782
2883
2983
3084
3185

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 91% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Muggy (%)Oppressive (%)Miserable (%)
118820
217830
316840
415850
515850
614860
713870
812880
911881
1010891
119901
129901
138911
147921
157912
166922
176922
185932
195923
204933
214933
224933
233943
243943
253943
263943
272953
282953
292962
302962
312962

Wind in December

Winds average 10 km/h in December.

Across December, daily wind ranges from about 9 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
229calm
239calm
249calm
259calm
269calm
279calm
289calm
299calm
309calm
319calm

Sunrise & sunset in December

DaylightNight

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

Days grow by about 0 minutes over December. Sunrise moves from 6:17 AM to 6:30 AM, and sunset from 6:14 PM to 6:28 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.06:176:14
212.06:176:15
312.06:176:15
412.06:186:15
512.06:186:16
612.06:196:16
712.06:196:17
812.06:196:17
912.06:206:17
1012.06:206:18
1112.06:216:18
1212.06:216:19
1312.06:226:19
1412.06:226:20
1512.06:236:20
1612.06:236:21
1712.06:246:21
1812.06:246:22
1912.06:246:22
2012.06:256:22
2112.06:256:23
2212.06:266:23
2312.06:266:24
2412.06:276:24
2512.06:276:25
2612.06:286:25
2712.06:286:26
2812.06:296:26
2912.06:296:27
3012.06:306:27
3112.06:306:28

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 4.75 kWh/m².

For context, solar energy here swings from a low near 3.67 kWh/m² to a high of 6.23 kWh/m² in October across the year — December's 4.75 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.3Bright
25.3Bright
35.2Bright
45.2Bright
55.2Bright
65.1Bright
75.1Bright
85.0Bright
95.0Bright
105.0Bright
114.9Bright
124.9Bright
134.8Bright
144.8Bright
154.8Bright
164.7Bright
174.7Bright
184.6Bright
194.6Bright
204.6Bright
214.5Bright
224.5Bright
234.5Bright
244.5Bright
254.4Bright
264.4Bright
274.4Bright
284.3Bright
294.3Bright
304.3Bright
314.3Bright
Planning a trip in December

Hazard calendar for Porto Grande

In seasonPeak

None of Porto 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.

Porto Grande's monsoon runs January–June, 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 Porto Grande?

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

3.0
Sightseeing
6th-best month of the year
4.9
Beach & pool
6th-best month of the year

December is a weaker month for outdoor sightseeing in Porto Grande.

What to pack for Porto Grande in December

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

In December, Porto Grande sees daytime highs around 32°C and nights near 23°C. Pack light clothes and rain gear. Worth having: sun protection. About 20 days see rain.

light clothesrain gearsun protection

UV index in Porto 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 Porto Grande peaks around February 22 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near August 10 at about 11 (extreme).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeFeb 22UV 15Aug 10UV 11
UV index (midday)Level
Jan13Extreme
Feb15Extreme
Mar15Extreme
Apr14Extreme
May12Extreme
Jun11Extreme
Jul11Extreme
Aug11Extreme
Sep12Extreme
Oct12Extreme
Nov11Extreme
Dec11Extreme

Air quality in Porto 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 Porto Grande is worst in February — around 20 µg/m³ PM2.5 (moderate), about 2.6× the cleanest month (July, 8 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateFeb 2020 µg/m³Jul 218 µg/m³
PM2.5 (µg/m³)Level
Jan17Moderate
Feb20Moderate
Mar19Moderate
Apr17Moderate
May10Good
Jun8Good
Jul8Good
Aug8Good
Sep10Good
Oct14Moderate
Nov14Moderate
Dec15Moderate
Location & terrain

Where is Porto Grande?

Porto Grande sits at 0.7°N, 51.4°W, 68 m above sea level, in Brazil. The nearest listed city is Macapá, 84 km away.

Anajás

Topography around Porto Grande

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

Within 3 km, the terrain around Porto Grande has only modest variations in elevation — a maximum elevation change of 59 m around an average of 74 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 177 m; within 80 km, significant variations in elevation — a maximum elevation change of 440 m.

The land around Porto Grande is covered by trees (40%) and grassland (34%) within 3 km, trees (73%) and grassland (22%) within 16 km, and trees (78%) within 80 km.

3 km
59 m
16 km
177 m
80 km
440 m
treesgrasslandartificial surfacesbare terrainwaterwetland
December weather nearby: Macapá 84 km · Santana 88 km · Mazagão 93 km · Afuá 150 km · Chaves 186 km · Laranjal do Jari 210 km · Gurupá 237 km · Anajás 250 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 Porto Grande (0.7133°, -51.4133°, elevation 68 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. 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).