Cachoeiras de Macacu weather in December

In December, Cachoeiras de Macacu sees average daytime highs of 27°C and overnight lows near 20°C, with 367 mm of rain across 24.7 wet days and about 13.4 hours of daylight. It is the 4th-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 11% 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 Cachoeiras de Macacu's 11th-clearest and 7th-windiest month. For the whole year in context, see Cachoeiras de Macacu's year-round climate.

Daytime high
27°
4th warmest
Overnight low
20°
10th coldest
Rainfall
367 mm
24.7 wet days
Daylight
13 h 24 min
6:06 AM – 7:28 PM
Cloud cover
76%
11th clearest
Wind
5 km/h
7th windiest
Solar energy
5.62 kWh/m²
Travel score
4.2
out of 10

Cachoeiras de Macacu 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 27°C through the month.

A typical December day in Cachoeiras de Macacu reaches about 27°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 23°C and 31°C. Set against its neighbours, December runs about 1°C warmer than November and about 1°C cooler than January.

15°20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
12719
22719
32719
42719
52720
62720
72720
82720
92720
102720
112720
122720
132720
142720
152720
162720
172720
182720
192820
202820
212820
222820
232820
242820
252820
262820
272820
282820
292820
302820
312820

Cachoeiras de Macacu weather by month

How December compares with the rest of the year at a glance. December is the 4th-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan28° / 21°36224.113.23.9
Feb29° / 20°2772012.84.0
Mar28° / 20°2872412.24.3
Apr26° / 18°13416.411.55.6
May24° / 16°871210.96.7
Jun24° / 15°497.710.77.5
Jul23° / 14°487.110.87.6
Aug24° / 14°517.711.27.5
Sep25° / 16°10812.311.96.6
Oct25° / 18°15916.512.55.6
Nov26° / 19°29721.613.14.7
Dec27° / 20°36724.713.44.2

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 11% 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 76%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
12377
22278
32179
42179
52080
62179
72080
82080
92080
102080
112080
122179
132179
142278
152278
162476
172476
182674
192674
202872
212971
222971
233070
243070
253070
262971
272971
282872
292872
302674
312674

Chance of precipitation in December

Any precipitation

Cachoeiras de Macacu gets around 367 mm of rain over 24.7 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 79% and peaks near 86% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%100%151015202531
Rain chance (%)
171
271
371
472
572
673
774
874
975
1076
1176
1277
1378
1478
1579
1679
1780
1881
1981
2082
2183
2283
2384
2485
2585
2686
2786
2886
2986
3086
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 61% of days. Sticky, muggy-or-worse air turns up on roughly 88% of them.

0%25%50%75%100%151015202531
Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
14216015
23206116
33196117
43186118
53186019
62176120
72166121
82156122
92146222
102146123
111136224
121126324
131116325
141116226
151106326
161106227
17096328
18096328
19086329
20086230
21076231
22076231
23076132
24066133
25066034
26065836
27065737
28065638
29065638
30065539
31065440

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 6:02 AM to 6:13 AM, and sunset from 7:19 PM to 7:35 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.36:027:19
213.36:027:19
313.36:027:20
413.36:027:21
513.36:037:21
613.36:037:22
713.36:037:23
813.36:037:23
913.36:037:24
1013.36:047:24
1113.36:047:25
1213.46:047:26
1313.46:057:26
1413.46:057:27
1513.46:057:27
1613.46:067:28
1713.46:067:28
1813.46:077:29
1913.46:077:29
2013.46:077:30
2113.46:087:30
2213.46:087:31
2313.46:097:31
2413.46:097:32
2513.46:107:32
2613.46:107:33
2713.46:117:33
2813.46:117:33
2913.46:127:34
3013.46:127:34
3113.46:137:35

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 5.62 kWh/m².

For context, solar energy here swings from a low near 3.44 kWh/m² to a high of 5.99 kWh/m² in February across the year — December's 5.62 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.4Bright
25.4Bright
35.4Bright
45.4Bright
55.4Bright
65.5Bright
75.5Bright
85.5Bright
95.5Bright
105.5Bright
115.5Bright
125.5Bright
135.5Bright
145.5Bright
155.6Bright
165.6Bright
175.6Bright
185.6Bright
195.6Bright
205.7Bright
215.7Bright
225.7Bright
235.7Bright
245.7Bright
255.7Bright
265.7Bright
275.7Bright
285.7Bright
295.7Bright
305.7Bright
315.7Bright
Planning a trip in December

Hazard calendar for Cachoeiras de Macacu

In seasonPeak

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

Cachoeiras de Macacu's rainy season runs November–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 Cachoeiras de Macacu?

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
4.4
Beach & pool
12th-best month of the year

December is a reasonable time to visit Cachoeiras de Macacu for sightseeing.

What to pack for Cachoeiras de Macacu in December

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

In December, Cachoeiras de Macacu sees daytime highs around 27°C and nights near 20°C. Pack light clothes and rain gear. Worth having: sun protection. About 25 days see rain.

light clothesrain gearsun protection

UV index in Cachoeiras de Macacu 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 Cachoeiras de Macacu 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 Cachoeiras de Macacu 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 Cachoeiras de Macacu 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 Cachoeiras de Macacu?

Cachoeiras de Macacu sits at 22.5°S, 42.7°W, 63 m above sea level, in Brazil. The nearest listed city is Nova Friburgo, 24 km away.

Topography around Cachoeiras de Macacu

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

Within 3 km, the terrain around Cachoeiras de Macacu has large variations in elevation — a maximum elevation change of 710 m around an average of 239 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 2,264 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,252 m.

The land around Cachoeiras de Macacu is covered by trees (80%) within 3 km, trees (86%) within 16 km, and trees (46%) and grassland (33%) within 80 km.

3 km
710 m
16 km
2,264 m
80 km
2,252 m
treesgrasslandartificial surfaceswaterwetland
December weather nearby: Nova Friburgo 24 km · Rio Bonito 28 km · Tanguá 30 km · São Pedro 32 km · Teresópolis 34 km · Silva Jardim 34 km · Guapimirim 35 km · Itaboraí 38 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 Cachoeiras de Macacu (-22.4625°, -42.6531°, elevation 63 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).