Barra do Piraí weather in January

In January, Barra do Piraí sees average daytime highs of 30°C and overnight lows near 21°C, with 282 mm of rain across 22 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 30°C through the month. The sky is clear or mostly clear about 15% of the time in January, and the air most often feels muggy.

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 Barra do Piraí's 10th-clearest and 7th-windiest month. For the whole year in context, see Barra do Piraí's year-round climate.

Daytime high
30°
2nd warmest
Overnight low
21°
12th coldest
Rainfall
282 mm
22 wet days
Daylight
13 h 12 min
6:27 AM – 7:42 PM
Cloud cover
75%
10th clearest
Wind
7 km/h
7th windiest
Solar energy
5.6 kWh/m²
Travel score
3.7
out of 10

Barra do Piraí 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 30°C through the month.

A typical January day in Barra do Piraí reaches about 30°C in the afternoon and slips back to 21°C overnight — a 9°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
113021
123021
133021
143021
153021
163021
173021
183021
193021
203021
213021
223021
233021
243021
253021
263021
273021
283021
293021
303021
313021

How January really feels in Barra do Piraí

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.

Barra do Piraí 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
Jan30° / 21°2822213.23.7
Feb30° / 21°20017.612.83.9
Mar29° / 20°19520.312.24.2
Apr27° / 19°8912.511.56.0
May25° / 16°539.310.97.0
Jun25° / 15°285.510.77.8
Jul24° / 15°295.310.87.9
Aug25° / 15°275.511.27.7
Sep26° / 17°661011.96.6
Oct27° / 18°11214.112.55.7
Nov27° / 19°20219.313.14.8
Dec29° / 20°24922.213.44.1

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 15% of the time in January.

Beyond those clear spells, partly cloudy skies cover about 13% of January, with mostly cloudy or overcast conditions the remaining 72%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
12674
22773
32674
42674
52674
62773
72773
82773
92872
102872
112872
122872
132971
142971
152872
162872
172872
182872
192773
202773
212773
222773
232872
242872
252872
262872
272971
283070
293070
303169
313169

Chance of precipitation in January

Any precipitation

Barra do Piraí gets around 282 mm of rain over 22 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 71% and peaks near 76% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%80%151015202531
Rain chance (%)
176
275
375
474
574
673
772
872
971
1071
1171
1270
1370
1470
1570
1671
1771
1871
1971
2071
2171
2271
2371
2470
2570
2669
2769
2868
2967
3067
3166

Humidity in January

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, January lands in the muggy band about 54% of days. Sticky, muggy-or-worse air turns up on roughly 93% of them.

0%25%50%75%100%151015202531
Humid (%)Muggy (%)Oppressive (%)
175736
275736
375736
475637
575637
675637
775637
875637
975637
1075637
1175637
1275637
1375637
1475637
1575538
1675538
1775538
1875439
1975439
2075340
2175340
2275241
2375241
2475241
2575241
2685141
2785141
2885141
2985141
3085240
3185240

Wind in January

Winds average 7 km/h in January.

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

0246810151015202531
Wind speed (km/h)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm
317calm

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 6:18 AM to 6:38 AM, and sunset from 7:39 PM to 7:40 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.46:187:39
213.36:187:39
313.36:197:40
413.36:207:40
513.36:207:40
613.36:217:40
713.36:227:41
813.36:227:41
913.36:237:41
1013.36:237:41
1113.36:247:41
1213.36:257:41
1313.36:257:42
1413.36:267:42
1513.26:277:42
1613.26:277:42
1713.26:287:42
1813.26:297:42
1913.26:297:42
2013.26:307:42
2113.26:317:42
2213.26:327:41
2313.26:327:41
2413.16:337:41
2513.16:347:41
2613.16:347:41
2713.16:357:41
2813.16:367:40
2913.16:367:40
3013.16:377:40
3113.06:387:40

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 5.6 kWh/m².

For context, solar energy here swings from a low near 3.36 kWh/m² to a high of 5.8 kWh/m² in February across the year — January's 5.6 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.5Bright
25.5Bright
35.6Bright
45.6Bright
55.6Bright
65.6Bright
75.6Bright
85.6Bright
95.6Bright
105.6Bright
115.6Bright
125.6Bright
135.6Bright
145.7Bright
155.7Bright
165.7Bright
175.7Bright
185.7Bright
195.7Bright
205.7Bright
215.7Bright
225.7Bright
235.7Bright
245.7Bright
255.7Bright
265.7Bright
275.8Bright
285.8Bright
295.8Bright
305.8Bright
315.8Bright
Planning a trip in January

Hazard calendar for Barra do Piraí

In seasonPeak

In January, Barra do Piraí sits inside its monsoon season. The full year is below, with each hazard's peak months called out.

Barra do Piraí's monsoon runs November–March, when most of the year's rain falls.

Monsoon
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is January a good time to visit Barra do Piraí?

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
11th-best month of the year

January is a weaker month for outdoor sightseeing in Barra do Piraí.

What to pack for Barra do Piraí in January

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

In January, Barra do Piraí sees daytime highs around 30°C and nights near 21°C. Pack light clothes and rain gear. Worth having: sun protection. About 22 days see rain.

light clothesrain gearsun protection

UV index in Barra do Piraí 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 Barra do Piraí 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
Mar12Extreme
Apr10Very high
May7High
Jun6High
Jul5High
Aug8Very high
Sep7High
Oct12Extreme
Nov14Extreme
Dec14Extreme

Air quality in Barra do Piraí 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 Barra do Piraí 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 Barra do Piraí?

Barra do Piraí sits at 22.5°S, 43.8°W, 366 m above sea level, in Brazil. The nearest listed city is Mendes, 11 km away.

Topography around Barra do Piraí

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

Within 3 km, the terrain around Barra do Piraí has significant variations in elevation — a maximum elevation change of 273 m around an average of 429 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 789 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,208 m.

The land around Barra do Piraí is covered by grassland (53%) and trees (27%) within 3 km, grassland (50%) and trees (48%) within 16 km, and trees (46%) and grassland (38%) within 80 km.

3 km
273 m
16 km
789 m
80 km
2,208 m
treesgrasslandartificial surfaceswater
January weather nearby: Mendes 11 km · Vassouras 18 km · Pinheiral 19 km · Piraí 19 km · Paracambi 19 km · Japeri 26 km · Valença 28 km · Volta Redonda 29 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 Barra do Piraí (-22.47°, -43.8256°, elevation 366 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).