Guapimirim weather in December

In December, Guapimirim sees average daytime highs of 28°C and overnight lows near 20°C, with 323 mm of rain across 23.6 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 28°C through the month. The sky is clear or mostly clear about 12% 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 Guapimirim's 11th-clearest and 6th-windiest month. For the whole year in context, see Guapimirim's year-round climate.

Daytime high
28°
4th warmest
Overnight low
20°
10th coldest
Rainfall
323 mm
23.6 wet days
Daylight
13 h 24 min
6:07 AM – 7:29 PM
Cloud cover
75%
11th clearest
Wind
5 km/h
6th windiest
Solar energy
5.54 kWh/m²
Travel score
4.2
out of 10

Guapimirim is human settlement in Brazil.

Air quality
Good
PM10 16 µg/m³ · 2012

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 28°C through the month.

A typical December day in Guapimirim reaches about 28°C in the afternoon and slips back to 20°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 24°C and 31°C. Set against its neighbours, December runs about 2°C warmer than November and about 1°C cooler than January.

15°20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
12720
22720
32720
42720
52720
62720
72720
82720
92720
102720
112820
122820
132820
142820
152820
162821
172821
182821
192821
202821
212821
222821
232821
242821
252821
262821
272821
282821
292821
302821
312821

Guapimirim 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
Jan29° / 21°32823.313.23.8
Feb29° / 21°24218.712.84.0
Mar28° / 20°25922.212.24.3
Apr27° / 19°11915.311.55.7
May24° / 16°8011.410.96.8
Jun24° / 15°497.410.67.6
Jul24° / 14°487.210.87.6
Aug24° / 15°497.511.27.5
Sep25° / 16°1021211.96.6
Oct26° / 18°1501612.55.6
Nov26° / 19°27220.713.14.7
Dec28° / 20°32323.613.44.2

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 12% 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 75%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
12476
22377
32278
42278
52179
62179
72179
82080
92080
102179
112179
122377
132575
142575
152674
162674
172872
182872
192971
203070
213070
223169
233169
243169
253070
262971
272971
282872
292872
302773
312674

Chance of precipitation in December

Any precipitation

Guapimirim gets around 323 mm of rain over 23.6 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 76% and peaks near 81% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%151015202531
Rain chance (%)
170
270
370
471
571
671
772
872
972
1073
1173
1274
1374
1475
1575
1676
1776
1876
1977
2078
2178
2279
2379
2480
2581
2681
2781
2881
2981
3081
3180

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 57% of days. Sticky, muggy-or-worse air turns up on roughly 89% of them.

0%25%50%75%100%151015202531
Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
12206018
22196019
32186020
42176021
51166122
61166023
71156024
81146025
91136026
101126027
111125928
121115929
131105930
14195931
15195931
16086032
17085933
18085933
19075934
20075835
21075736
22065737
23065638
24065539
25055540
26055441
27055342
28055243
29065044
30065044
31065045

Wind in December

Winds average 5 km/h in December.

Across December, daily wind ranges from about 5 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
185calm
195calm
205calm
215calm
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm
315calm

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 6:03 AM to 6:14 AM, and sunset from 7:20 PM to 7:36 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.36:037:20
213.36:037:21
313.36:037:21
413.36:047:22
513.36:047:23
613.36:047:23
713.36:047:24
813.36:047:25
913.36:057:25
1013.36:057:26
1113.46:057:26
1213.46:057:27
1313.46:067:28
1413.46:067:28
1513.46:077:29
1613.46:077:29
1713.46:077:30
1813.46:087:30
1913.46:087:31
2013.46:097:31
2113.46:097:32
2213.46:097:32
2313.46:107:33
2413.46:107:33
2513.46:117:34
2613.46:117:34
2713.46:127:35
2813.46:127:35
2913.46:137:35
3013.46:147:36
3113.46:147:36

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 5.54 kWh/m².

For context, solar energy here swings from a low near 3.39 kWh/m² to a high of 5.92 kWh/m² in February across the year — December's 5.54 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
75.4Bright
85.4Bright
95.4Bright
105.4Bright
115.4Bright
125.4Bright
135.5Bright
145.5Bright
155.5Bright
165.5Bright
175.5Bright
185.5Bright
195.6Bright
205.6Bright
215.6Bright
225.6Bright
235.6Bright
245.6Bright
255.6Bright
265.7Bright
275.7Bright
285.7Bright
295.7Bright
305.7Bright
315.7Bright
Planning a trip in December

Hazard calendar for Guapimirim

In seasonPeak

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

Guapimirim'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 Guapimirim?

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

4.2
Sightseeing
10th-best month of the year
4.6
Beach & pool
12th-best month of the year

December is a reasonable time to visit Guapimirim for sightseeing.

What to pack for Guapimirim in December

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

In December, Guapimirim sees daytime highs around 28°C and nights near 20°C. Pack light clothes and rain gear. Worth having: sun protection. About 24 days see rain.

light clothesrain gearsun protection

Sea temperature near Guapimirim 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 66 km away) is warmest in March at about 25°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°JanFebMarAprMayJunJulAugSepOctNovDeccoolrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan25Warm
Feb25Warm
Mar25Warm
Apr25Warm
May24Refreshing
Jun23Refreshing
Jul22Refreshing
Aug21Refreshing
Sep21Refreshing
Oct22Refreshing
Nov23Refreshing
Dec24Warm

UV index in Guapimirim 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 Guapimirim peaks around January 21 at about 14 (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 highExtremeJan 21UV 14Jul 11UV 6
UV index (midday)Level
Jan15Extreme
Feb14Extreme
Mar13Extreme
Apr10Very high
May7High
Jun6High
Jul6High
Aug8Very high
Sep7Very high
Oct12Extreme
Nov14Extreme
Dec14Extreme

Air quality in Guapimirim 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 Guapimirim is worst in September — around 19 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (March, 10 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodSep 1518 µg/m³Mar 1110 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb11Good
Mar10Good
Apr12Good
May15Moderate
Jun16Moderate
Jul15Moderate
Aug15Moderate
Sep19Moderate
Oct13Moderate
Nov11Good
Dec10Good
Location & terrain

Where is Guapimirim?

Guapimirim sits at 22.5°S, 43.0°W, 33 m above sea level, in Brazil. The nearest listed city is São Pedro, 13 km away.

Topography around Guapimirim

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

Within 3 km, the terrain around Guapimirim has significant variations in elevation — a maximum elevation change of 480 m around an average of 97 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 2,243 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,252 m.

The land around Guapimirim is covered by trees (74%) within 3 km, trees (71%) and grassland (22%) within 16 km, and trees (47%) and grassland (29%) within 80 km.

3 km
480 m
16 km
2,243 m
80 km
2,252 m
treesgrasslandcroplandartificial surfaceswaterwetland
December weather nearby: São Pedro 13 km · Teresópolis 13 km · Magé 14 km · Petrópolis 21 km · Itaboraí 26 km · Cachoeiras de Macacu 35 km · Tanguá 35 km · Niterói 40 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 Guapimirim (-22.5372°, -42.9819°, elevation 33 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).