Petrópolis weather in January

In January, Petrópolis sees average daytime highs of 29°C and overnight lows near 21°C, with 315 mm of rain across 22.8 wet days and about 13.2 hours of daylight. It is the 2nd-warmest and 1st-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 14% 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 Petrópolis's 10th-clearest and 7th-windiest month. For the whole year in context, see Petrópolis's year-round climate.

Daytime high
29°
2nd warmest
Overnight low
21°
12th coldest
Rainfall
315 mm
22.8 wet days
Daylight
13 h 12 min
6:25 AM – 7:39 PM
Cloud cover
75%
10th clearest
Wind
5 km/h
7th windiest
Solar energy
5.7 kWh/m²
Travel score
3.7
out of 10

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 Petrópolis 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 33°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
202921
212921
222921
232921
242921
252921
263021
273021
283021
293021
303021
313021

How January really feels in Petrópolis

Once humidity and wind are folded in, January averages 6 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
6
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

The story in January is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Petrópolis weather by month

How January compares with the rest of the year at a glance. January is the 2nd-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan29° / 21°31522.813.23.7
Feb30° / 21°23118.512.83.9
Mar29° / 21°24422.112.24.2
Apr27° / 19°10514.111.55.8
May25° / 16°701110.96.8
Jun24° / 15°41710.67.6
Jul24° / 15°406.610.87.8
Aug25° / 15°427.211.27.6
Sep26° / 17°8810.711.96.6
Oct26° / 18°13715.112.55.7
Nov27° / 19°2522013.14.8
Dec28° / 21°29623.313.44.1

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 14% of the time in January.

Beyond those clear spells, partly cloudy skies cover about 15% of January, with mostly cloudy or overcast conditions the remaining 71%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
12773
22773
32773
42773
52674
62773
72872
82872
92872
102872
112971
122971
132971
142971
152971
162971
172971
182971
192872
202872
212971
222971
232971
242971
253169
263169
273169
283367
293367
303268
313367

Chance of precipitation in January

Any precipitation

Petrópolis gets around 315 mm of rain over 22.8 wet days in January, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 73% and peaks near 78% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%80%151015202531
Rain chance (%)
178
277
377
476
576
675
775
874
974
1073
1173
1273
1373
1473
1573
1673
1774
1874
1974
2074
2174
2273
2373
2473
2572
2671
2771
2870
2969
3069
3168

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 53% of days. Sticky, muggy-or-worse air turns up on roughly 97% of them.

0%25%50%75%100%151015202531
Humid (%)Muggy (%)Oppressive (%)
154550
244551
344551
444551
544551
644551
734651
834651
934651
1034750
1134750
1224751
1324751
1424751
1524751
1624652
1724652
1824553
1934552
2034453
2134354
2234255
2334156
2434156
2534057
2634057
2734057
2833958
2934057
3034057
3134057

Wind in January

Winds average 5 km/h in January.

Across January, 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 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 6:15 AM to 6:35 AM, and sunset from 7:37 PM to 7:37 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.46:157:37
213.46:167:37
313.36:167:37
413.36:177:37
513.36:187:38
613.36:187:38
713.36:197:38
813.36:207:38
913.36:207:39
1013.36:217:39
1113.36:217:39
1213.36:227:39
1313.36:237:39
1413.36:237:39
1513.36:247:39
1613.26:257:39
1713.26:257:39
1813.26:267:39
1913.26:277:39
2013.26:287:39
2113.26:287:39
2213.26:297:39
2313.26:307:39
2413.16:307:39
2513.16:317:39
2613.16:327:38
2713.16:327:38
2813.16:337:38
2913.16:347:38
3013.16:347:37
3113.06:357:37

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 5.7 kWh/m².

For context, solar energy here swings from a low near 3.35 kWh/m² to a high of 5.87 kWh/m² in February across the year — January's 5.7 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
95.7Bright
105.7Bright
115.7Bright
125.7Bright
135.7Bright
145.8Bright
155.8Bright
165.8Bright
175.8Bright
185.8Bright
195.8Bright
205.8Bright
215.8Bright
225.8Bright
235.8Bright
245.8Bright
255.8Bright
265.8Bright
275.8Bright
285.8Bright
295.9Bright
305.9Bright
315.9Bright
Planning a trip in January

Hazard calendar for Petrópolis

In seasonPeak

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

Petrópolis'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 January a good time to visit Petrópolis?

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

3.7
Sightseeing
12th-best month of the year
4.9
Beach & pool
10th-best month of the year

January is a weaker month for outdoor sightseeing in Petrópolis.

What to pack for Petrópolis in January

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

In January, Petrópolis sees daytime highs around 29°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 Petrópolis in January

The nearest coast averages about 25°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 69 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 Petrópolis in January

LowModerateHighVery highExtreme

Clear-sky midday UV in January peaks around 15 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Petrópolis peaks around January 24 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 12 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 24UV 15Jul 12UV 6
UV index (midday)Level
Jan15Extreme
Feb15Extreme
Mar13Extreme
Apr9Very high
May7High
Jun6High
Jul6High
Aug8Very high
Sep7High
Oct12Extreme
Nov14Extreme
Dec14Extreme

Air quality in Petrópolis in January

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where January falls, not just the annual average.

Air quality in Petrópolis is worst in July — around 38 µg/m³ PM2.5 (poor), about 2.0× the cleanest month (December, 19 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecModeratePoorModerateModerateJul 1237 µg/m³Dec 2319 µg/m³
PM2.5 (µg/m³)Level
Jan19Moderate
Feb19Moderate
Mar21Moderate
Apr24Moderate
May31Moderate
Jun36Poor
Jul38Poor
Aug32Moderate
Sep37Poor
Oct24Moderate
Nov20Moderate
Dec19Moderate
Location & terrain

Where is Petrópolis?

Petrópolis sits at 22.5°S, 43.2°W, 819 m above sea level, in Brazil. The nearest listed city is Guapimirim, 21 km away.

Topography around Petrópolis

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

Within 3 km, the terrain around Petrópolis has large variations in elevation — a maximum elevation change of 611 m around an average of 927 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 2,242 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,252 m.

The land around Petrópolis is covered by trees (70%) and artificial surfaces (23%) within 3 km, trees (81%) within 16 km, and trees (47%) and grassland (32%) within 80 km.

3 km
611 m
16 km
2,242 m
80 km
2,252 m
treesgrasslandartificial surfaceswaterwetlandmangroves
January weather nearby: Guapimirim 21 km · Magé 22 km · Teresópolis 23 km · São Pedro 24 km · Paty do Alferes 26 km · Miguel Pereira 30 km · Duque de Caxias 34 km · Belford Roxo 37 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 Petrópolis (-22.505°, -43.1786°, elevation 819 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).