Casimiro de Abreu weather in January

In January, Casimiro de Abreu sees average daytime highs of 29°C and overnight lows near 21°C, with 291 mm of rain across 21.6 wet days and about 13.2 hours of daylight. It is the 2nd-warmest and 2nd-wettest month of the year here.

Day-to-day highs hold fairly steady near 29°C through the month. The sky is clear or mostly clear about 19% of the time in January, and the air most often feels oppressive.

Daylight stretches from about 13 h 24 min at the start of January to 13 hours by month's end. Set against the rest of the year, January is Casimiro de Abreu's 10th-clearest and 7th-windiest month. For the whole year in context, see Casimiro de Abreu's year-round climate.

Daytime high
29°
2nd warmest
Overnight low
21°
12th coldest
Rainfall
291 mm
21.6 wet days
Daylight
13 h 12 min
6:21 AM – 7:35 PM
Cloud cover
72%
10th clearest
Wind
8 km/h
7th windiest
Solar energy
6.04 kWh/m²
Travel score
4.0
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 January

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 29°C through the month.

A typical January day in Casimiro de Abreu reaches about 29°C in the afternoon and slips back to 21°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 25°C and 32°C. Set against its neighbours, January runs about 1°C warmer than December and on par with February.

15°20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
12921
22921
32921
42921
52921
62921
72921
82921
92921
102921
112921
122921
132921
142921
152921
162921
172921
182921
192921
202922
212922
222922
232922
242922
252922
262922
272922
282922
292922
302922
312922

How January really feels in Casimiro de Abreu

Once humidity and wind are folded in, January 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

January 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 January compares with the rest of the year at a glance. January is the 2nd-warmest and 2nd-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 January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 19% of the time in January.

Beyond those clear spells, partly cloudy skies cover about 12% of January, with mostly cloudy or overcast conditions the remaining 69%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13070
22971
32971
42971
52971
62971
72971
83070
93070
103070
113070
123169
133169
143169
153268
163268
173268
183169
193070
203070
213169
223169
233268
243367
253367
263466
273466
283565
293664
303763
313862

Chance of precipitation in January

Any precipitation

Casimiro de Abreu gets around 291 mm of rain over 21.6 wet days in January. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 69% and peaks near 77% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%80%151015202531
Rain chance (%)
177
276
375
474
574
673
772
871
970
1069
1169
1268
1368
1467
1567
1667
1767
1868
1968
2068
2168
2267
2367
2467
2566
2665
2765
2864
2964
3063
3163

Humidity in January

DryComfortableHumidMuggyOppressiveMiserable

Most of January feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, January lands in the oppressive band about 58% of days. Sticky, muggy-or-worse air turns up on roughly 98% of them.

0%25%50%75%100%151015202531
Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1339580
2340570
3340570
4340570
5241570
6241570
7242560
8242560
9242560
10243550
11243550
12243550
13243550
14243550
15243550
16242560
17242560
18241570
19240580
20240580
21239590
22238600
23238600
24237610
25237610
26236620
27236620
28236611
29236611
30236611
31236611

Wind in January

Winds average 8 km/h in January.

Across January, daily wind ranges from about 8 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
248calm
258calm
268calm
278calm
288calm
298calm
308calm
318calm

Sunrise & sunset in January

DaylightNight

Daylight runs from about 13 h 24 min at the start of January to 13 hours by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 24 minutes over January. Sunrise moves from 6:11 AM to 6:31 AM, and sunset from 7:33 PM to 7:33 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.46:117:33
213.46:127:33
313.36:137:33
413.36:137:33
513.36:147:34
613.36:147:34
713.36:157:34
813.36:167:34
913.36:167:35
1013.36:177:35
1113.36:187:35
1213.36:187:35
1313.36:197:35
1413.36:207:35
1513.26:207:35
1613.26:217:35
1713.26:227:35
1813.26:227:35
1913.26:237:35
2013.26:247:35
2113.26:247:35
2213.26:257:35
2313.26:267:35
2413.16:267:35
2513.16:277:35
2613.16:287:34
2713.16:287:34
2813.16:297:34
2913.16:307:34
3013.16:307:34
3113.06:317:33

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 6.04 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 — January's 6.04 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
16.0Bright
26.0Intense
36.0Intense
46.0Intense
56.0Intense
66.0Intense
76.0Intense
86.1Intense
96.1Intense
106.1Intense
116.1Intense
126.1Intense
136.1Intense
146.1Intense
156.1Intense
166.1Intense
176.1Intense
186.1Intense
196.1Intense
206.1Intense
216.1Intense
226.1Intense
236.1Intense
246.1Intense
256.2Intense
266.2Intense
276.2Intense
286.2Intense
296.2Intense
306.2Intense
316.2Intense
Planning a trip in January

Hazard calendar for Casimiro de Abreu

In seasonPeak

In January, 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 January a good time to visit Casimiro de Abreu?

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

4.0
Sightseeing
12th-best month of the year
5.1
Beach & pool
10th-best month of the year

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

What to pack for Casimiro de Abreu in January

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

In January, Casimiro de Abreu sees daytime highs around 29°C and nights near 21°C. Pack light clothes, rain gear and sun protection. About 22 days see rain.

light clothesrain gearsun protection

Sea temperature near Casimiro de Abreu in January

The nearest coast averages about 24°C in January — 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 January

LowModerateHighVery highExtreme

Clear-sky midday UV in January 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
January 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).