São João da Barra weather in December

In December, São João da Barra sees average daytime highs of 27°C and overnight lows near 24°C, with 151 mm of rain across 14.3 wet days and about 13.3 hours of daylight. It is the 5th-warmest and 1st-wettest month of the year here.

Day-to-day highs hold fairly steady near 27°C through the month. The sky is clear or mostly clear about 24% of the time in December, and the air most often feels oppressive.

Daylight stretches from about 13 h 12 min at the start of December to 13 h 18 min by month's end. Set against the rest of the year, December is São João da Barra's 11th-clearest and 6th-windiest month. For the whole year in context, see São João da Barra's year-round climate.

Daytime high
27°
5th warmest
Overnight low
24°
9th coldest
Rainfall
151 mm
14.3 wet days
Daylight
13 h 18 min
6:01 AM – 7:20 PM
Cloud cover
66%
11th clearest
Wind
19 km/h
6th windiest
Solar energy
6.28 kWh/m²
Travel score
5.8
out of 10

São João da Barra is 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 27°C through the month.

A typical December day in São João da Barra reaches about 27°C in the afternoon and slips back to 24°C overnight — a 3°C spread between the day's warmth and the night's chill. On most days the high lands between 25°C and 28°C. Set against its neighbours, December runs about 1°C warmer than November and on par with January.

20°23°25°28°30°151015202531
Avg high (°C)Avg low (°C)
12623
22623
32623
42623
52623
62623
72623
82623
92723
102723
112724
122724
132724
142724
152724
162724
172724
182724
192724
202724
212724
222724
232724
242724
252724
262724
272724
282724
292724
302724
312724

São João da Barra weather by month

How December compares with the rest of the year at a glance. December is the 5th-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan27° / 24°11410.413.26.3
Feb28° / 24°547.612.76.5
Mar28° / 24°11212.712.26.0
Apr27° / 23°7511.411.56.5
May25° / 22°519.6117.1
Jun25° / 21°256.310.77.8
Jul24° / 20°296.510.88.0
Aug24° / 20°26611.38.0
Sep25° / 21°488.111.97.5
Oct25° / 22°788.812.57.0
Nov26° / 23°13913.8135.9
Dec27° / 24°15114.313.35.8

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

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

Beyond those clear spells, partly cloudy skies cover about 14% of December, with mostly cloudy or overcast conditions the remaining 62%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13565
23466
33367
43367
53367
63367
73268
83268
93367
103466
113466
123565
133565
143763
153862
163862
173961
184060
194159
204159
214159
224258
234357
244258
254258
264357
274159
284159
294159
304060
314060

Chance of precipitation in December

Any precipitation

São João da Barra gets around 151 mm of rain over 14.3 wet days in December, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 46% and peaks near 50% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)
149
249
350
450
550
650
750
849
949
1049
1148
1248
1347
1447
1546
1645
1745
1844
1944
2044
2143
2243
2343
2443
2543
2643
2742
2842
2942
3041
3140

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 80% of days. Sticky, muggy-or-worse air turns up on roughly 96% of them.

0%25%50%75%100%151015202531
Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
11823671
21822681
31822681
41721692
51720702
61720702
71619713
81619713
91618723
100517753
110417763
120416773
130315793
140315793
150214813
160213823
170212833
180212833
190211843
200110863
210110872
22019882
23019882
24019882
25018892
26018892
27018892
28018883
29018883
30018883
31018883

Wind in December

Winds average 19 km/h in December.

Across December, daily wind ranges from about 19 km/h on the calmest days to 20 km/h at its breeziest. It stays fairly steady from day to day.

0510152025151015202531
Wind speed (km/h)Feels
119light breeze
219light breeze
319light breeze
419light breeze
519light breeze
619light breeze
719light breeze
819light breeze
919light breeze
1019light breeze
1119light breeze
1219light breeze
1319light breeze
1419light breeze
1519light breeze
1619light breeze
1719light breeze
1819light breeze
1919light breeze
2019light breeze
2119light breeze
2219light breeze
2319light breeze
2419light breeze
2519light breeze
2619light breeze
2719light breeze
2820light breeze
2920light breeze
3020light breeze
3120light breeze

Sunrise & sunset in December

DaylightNight

Daylight runs from about 13 h 12 min at the start of December to 13 h 18 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 5:57 AM to 6:08 AM, and sunset from 7:11 PM to 7:26 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.25:577:11
213.25:577:11
313.25:577:12
413.35:587:13
513.35:587:13
613.35:587:14
713.35:587:15
813.35:587:15
913.35:597:16
1013.35:597:16
1113.35:597:17
1213.36:007:17
1313.36:007:18
1413.36:007:19
1513.36:017:19
1613.36:017:20
1713.36:017:20
1813.36:027:21
1913.36:027:21
2013.36:037:22
2113.36:037:22
2213.36:047:23
2313.36:047:23
2413.36:057:24
2513.36:057:24
2613.36:067:25
2713.36:067:25
2813.36:077:25
2913.36:077:26
3013.36:087:26
3113.36:087:26

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 6.28 kWh/m².

For context, solar energy here swings from a low near 3.64 kWh/m² to a high of 6.72 kWh/m² in February across the year — December's 6.28 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
16.0Intense
26.0Intense
36.0Intense
46.0Intense
56.0Intense
66.0Intense
76.0Intense
86.1Intense
96.1Intense
106.1Intense
116.1Intense
126.2Intense
136.2Intense
146.2Intense
156.2Intense
166.3Intense
176.3Intense
186.3Intense
196.4Intense
206.4Intense
216.4Intense
226.4Intense
236.5Intense
246.5Intense
256.5Intense
266.5Intense
276.5Intense
286.5Intense
296.5Intense
306.5Intense
316.5Intense
Planning a trip in December

Hazard calendar for São João da Barra

In seasonPeak

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

São João da Barra's rainy season runs October–January, 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 São João da Barra?

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

5.8
Sightseeing
12th-best month of the year
5.9
Beach & pool
11th-best month of the year

December is a reasonable time to visit São João da Barra for sightseeing.

What to pack for São João da Barra in December

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

In December, São João da Barra sees daytime highs around 27°C and nights near 24°C. Pack rain gear and sun protection. Worth having: light clothes. About 14 days see rain.

rain gearsun protectionlight clothes

Sea temperature near São João da Barra in December

The nearest coast averages about 24°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 18 km away) is warmest in March at about 25°C and coldest in August near 22°C.

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

20°22°24°26°JanFebMarAprMayJunJulAugSepOctNovDecrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan24Warm
Feb25Warm
Mar25Warm
Apr25Warm
May24Warm
Jun23Refreshing
Jul23Refreshing
Aug22Refreshing
Sep22Refreshing
Oct23Refreshing
Nov24Refreshing
Dec24Warm

UV index in São João da Barra 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 São João da Barra peaks around February 9 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 23 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 14Jun 23UV 6
UV index (midday)Level
Jan14Extreme
Feb14Extreme
Mar12Extreme
Apr9Very high
May7High
Jun6High
Jul6High
Aug8Very high
Sep9Very high
Oct12Extreme
Nov13Extreme
Dec13Extreme
Location & terrain

Where is São João da Barra?

São João da Barra sits at 21.6°S, 41.1°W, 7 m above sea level, in Brazil. The nearest listed city is Campos dos Goytacazes, 31 km away.

Topography around São João da Barra

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of São João da Barra.

Within 3 km, the terrain around São João da Barra has only modest variations in elevation — a maximum elevation change of 11 m around an average of 2 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 19 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,525 m.

The land around São João da Barra is covered by grassland (59%) within 3 km, water (47%) and grassland (37%) within 16 km, and grassland (44%) and water (38%) within 80 km.

3 km
11 m
16 km
19 m
80 km
1,525 m
treesgrasslandcroplandartificial surfacesbare terrainwaterwetlandmangroves
December weather nearby: Campos dos Goytacazes 31 km · São Francisco de Itabapoana 39 km · Quissamã 68 km · Marataizes 70 km · Mimoso do Sul 72 km · São Fidélis 72 km · Itapemirim 73 km · Bom Jesus do Itabapoana 86 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 São João da Barra (-21.6403°, -41.0511°, elevation 7 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).