Casimiro de Abreu weather in December

In December, Casimiro de Abreu sees average daytime highs of 28°C and overnight lows near 21°C, with 308 mm of rain across 22.9 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 28°C through the month. The sky is clear or mostly clear about 14% 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 Casimiro de Abreu's 11th-clearest and 7th-windiest month. For the whole year in context, see Casimiro de Abreu's year-round climate.

Daytime high
28°
4th warmest
Overnight low
21°
10th coldest
Rainfall
308 mm
22.9 wet days
Daylight
13 h 24 min
6:04 AM – 7:26 PM
Cloud cover
74%
11th clearest
Wind
8 km/h
7th windiest
Solar energy
5.89 kWh/m²
Travel score
4.2
out of 10

Casimiro de Abreu 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 28°C through the month.

A typical December day in Casimiro de Abreu reaches about 28°C in the afternoon and slips back to 21°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
92721
102821
112821
122821
132821
142821
152821
162821
172821
182821
192821
202821
212821
222821
232821
242821
252821
262821
272821
282921
292921
302921
312921

How December really feels in Casimiro de Abreu

Once humidity and wind are folded in, December averages 0 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
0
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

December sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Casimiro de Abreu 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
Jan29° / 21°29121.613.24.0
Feb29° / 21°21016.812.84.2
Mar28° / 21°24021.512.24.3
Apr27° / 19°11914.911.55.8
May25° / 17°7912.210.96.6
Jun24° / 16°437.310.77.6
Jul24° / 15°407.410.87.7
Aug25° / 16°488.211.27.4
Sep25° / 17°10412.911.96.4
Oct26° / 18°1541612.55.6
Nov26° / 19°27521.213.14.7
Dec28° / 21°30822.913.44.2

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 13% of December, with mostly cloudy or overcast conditions the remaining 73%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
12377
22179
32179
42179
52179
62080
72080
82179
92179
102377
112377
122476
132674
142674
152674
162872
172971
182971
193070
203169
213169
223169
233169
243169
253169
263169
273169
283070
292971
302971
312971

Chance of precipitation in December

Any precipitation

Casimiro de Abreu gets around 308 mm of rain over 22.9 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 74% and peaks near 78% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%151015202531
Rain chance (%)
171
271
371
472
572
672
772
872
972
1072
1172
1272
1372
1472
1572
1673
1773
1873
1974
2074
2175
2275
2376
2476
2577
2677
2778
2878
2978
3078
3178

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 47% of days. Sticky, muggy-or-worse air turns up on roughly 92% of them.

0%25%50%75%100%151015202531
Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
12155627
22145628
32145529
42135431
52125432
61125334
71115335
81105336
91105138
10195139
11185041
12175042
13174944
14164845
15064746
16054748
17054649
18054550
19044452
20044353
21044353
22044254
23044254
24034156
25034057
26034057
27033958
28033958
29033859
30033958
31033958

Wind in December

Winds average 8 km/h in December.

Across December, daily wind ranges from about 7 km/h on the calmest days to 8 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
18calm
28calm
38calm
48calm
58calm
68calm
78calm
88calm
98calm
108calm
118calm
128calm
138calm
148calm
158calm
168calm
178calm
188calm
198calm
208calm
218calm
228calm
238calm
247calm
257calm
267calm
277calm
287calm
297calm
308calm
318calm

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 6:00 AM to 6:11 AM, and sunset from 7:17 PM to 7:33 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.36:007:17
213.36:007:18
313.36:007:18
413.36:017:19
513.36:017:20
613.36:017:20
713.36:017:21
813.36:017:21
913.36:027:22
1013.36:027:23
1113.46:027:23
1213.46:027:24
1313.46:037:24
1413.46:037:25
1513.46:047:26
1613.46:047:26
1713.46:047:27
1813.46:057:27
1913.46:057:28
2013.46:067:28
2113.46:067:29
2213.46:067:29
2313.46:077:30
2413.46:077:30
2513.46:087:30
2613.46:087:31
2713.46:097:31
2813.46:107:32
2913.46:107:32
3013.46:117:32
3113.46:117:33

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 5.89 kWh/m².

For context, solar energy here swings from a low near 3.54 kWh/m² to a high of 6.21 kWh/m² in February across the year — December's 5.89 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.7Bright
25.7Bright
35.7Bright
45.7Bright
55.7Bright
65.7Bright
75.7Bright
85.7Bright
95.8Bright
105.8Bright
115.8Bright
125.8Bright
135.8Bright
145.8Bright
155.8Bright
165.9Bright
175.9Bright
185.9Bright
195.9Bright
205.9Bright
215.9Bright
226.0Bright
236.0Bright
246.0Bright
256.0Bright
266.0Bright
276.0Bright
286.0Bright
296.0Bright
306.0Bright
316.0Bright
Planning a trip in December

Hazard calendar for Casimiro de Abreu

In seasonPeak

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

Casimiro de Abreu'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 Casimiro de Abreu?

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
4.7
Beach & pool
11th-best month of the year

December is a reasonable time to visit Casimiro de Abreu for sightseeing.

What to pack for Casimiro de Abreu in December

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

In December, Casimiro de Abreu sees daytime highs around 28°C and nights near 21°C. Pack light clothes and rain gear. Worth having: sun protection. About 23 days see rain.

light clothesrain gearsun protection

Sea temperature near Casimiro de Abreu 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 37 km away) is warmest in March at about 25°C and coldest in September 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
Jan24Refreshing
Feb24Warm
Mar25Warm
Apr25Warm
May24Refreshing
Jun23Refreshing
Jul22Refreshing
Aug22Refreshing
Sep21Refreshing
Oct22Refreshing
Nov22Refreshing
Dec24Refreshing

UV index in Casimiro de Abreu 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 Casimiro de Abreu peaks around January 17 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 17UV 14Jul 11UV 6
UV index (midday)Level
Jan14Extreme
Feb14Extreme
Mar13Extreme
Apr10Very high
May7High
Jun6High
Jul6High
Aug8Very high
Sep7Very high
Oct12Extreme
Nov14Extreme
Dec14Extreme
Location & terrain

Where is Casimiro de Abreu?

Casimiro de Abreu sits at 22.5°S, 42.2°W, 23 m above sea level, in Brazil. The nearest listed city is Silva Jardim, 27 km away.

Topography around Casimiro de Abreu

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

Within 3 km, the terrain around Casimiro de Abreu has significant variations in elevation — a maximum elevation change of 480 m around an average of 71 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,325 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,252 m.

The land around Casimiro de Abreu is covered by trees (51%) and grassland (39%) within 3 km, trees (59%) and grassland (32%) within 16 km, and trees (37%), grassland (31%) and water (30%) within 80 km.

3 km
480 m
16 km
1,325 m
80 km
2,252 m
treesgrasslandcroplandartificial surfaceswaterwetland
December weather nearby: Silva Jardim 27 km · Rio das Ostras 27 km · Iguaba Grande 40 km · Nova Friburgo 40 km · São Pedro da Aldeia 41 km · Bom Jardim 43 km · Buzios 44 km · Macaé 45 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 Casimiro de Abreu (-22.4806°, -42.2042°, elevation 23 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).