Piraí weather in January

In January, Piraí sees average daytime highs of 29°C and overnight lows near 22°C, with 309 mm of rain across 23.5 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 15% 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 Piraí's 10th-clearest and 7th-windiest month. For the whole year in context, see Piraí's year-round climate.

Daytime high
29°
2nd warmest
Overnight low
22°
12th coldest
Rainfall
309 mm
23.5 wet days
Daylight
13 h 12 min
6:27 AM – 7:42 PM
Cloud cover
75%
10th clearest
Wind
6 km/h
7th windiest
Solar energy
5.62 kWh/m²
Travel score
3.6
out of 10

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 29°C through the month.

A typical January day in Piraí reaches about 29°C in the afternoon and slips back to 22°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
22922
32922
42922
52922
62922
72922
82922
92922
102922
112922
122922
132922
142922
152922
162922
172922
182922
192922
202922
212922
222922
232922
243022
253022
263022
273022
283022
293022
303022
313022

How January really feels in Piraí

Once humidity and wind are folded in, January averages 8 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
8
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.

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
Jan29° / 22°30923.513.23.6
Feb30° / 22°2221912.83.8
Mar29° / 21°22522.612.24.1
Apr27° / 19°11714.511.55.8
May25° / 17°7011.310.96.7
Jun24° / 16°406.710.67.6
Jul24° / 15°427.410.87.7
Aug25° / 16°37711.27.5
Sep26° / 17°8111.811.96.4
Oct27° / 19°12015.612.55.5
Nov27° / 20°20020.413.14.7
Dec28° / 21°25223.213.44.0

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
22674
32674
42773
52773
62773
72674
82773
92872
102773
112773
122872
132872
142773
152773
162872
172872
182872
192773
202872
212872
222773
232872
242872
252971
262971
273070
283070
293070
303169
313268

Chance of precipitation in January

Any precipitation

Piraí gets around 309 mm of rain over 23.5 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 76% and peaks near 80% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%80%151015202531
Rain chance (%)
180
279
378
478
577
677
776
876
975
1075
1175
1275
1375
1475
1576
1676
1776
1877
1977
2077
2177
2276
2376
2475
2575
2674
2773
2872
2972
3071
3170

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 96% of them.

0%25%50%75%100%151015202531
Humid (%)Muggy (%)Oppressive (%)
154748
254749
344749
444749
544749
634749
734750
834750
934750
1034750
1134750
1234750
1334750
1434651
1534651
1634552
1734453
1844353
1944254
2044155
2144056
2254055
2353956
2453857
2553857
2653857
2753857
2853857
2953857
3043957
3143957

Wind in January

Winds average 6 km/h in January.

Across January, daily wind ranges from about 6 km/h on the calmest days to 6 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm
316calm

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 7:40 PM to 7:40 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.46:187:40
213.46:187:40
313.46:197:40
413.36:207:41
513.36:207:41
613.36:217:41
713.36:217:41
813.36:227:41
913.36:237:42
1013.36:237:42
1113.36:247:42
1213.36:257:42
1313.36:257:42
1413.36:267:42
1513.36:277:42
1613.26:277:42
1713.26:287:42
1813.26:297:42
1913.26:307:42
2013.26:307:42
2113.26:317:42
2213.26:327:42
2313.26:327:42
2413.16:337:42
2513.16:347:42
2613.16:347:41
2713.16:357:41
2813.16:367:41
2913.16:367:41
3013.16:377:41
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 5.62 kWh/m².

For context, solar energy here swings from a low near 3.36 kWh/m² to a high of 5.81 kWh/m² in February across the year — January's 5.62 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.6Bright
25.6Bright
35.6Bright
45.6Bright
55.6Bright
65.6Bright
75.6Bright
85.6Bright
95.6Bright
105.7Bright
115.7Bright
125.7Bright
135.7Bright
145.7Bright
155.7Bright
165.7Bright
175.7Bright
185.7Bright
195.7Bright
205.7Bright
215.7Bright
225.7Bright
235.7Bright
245.7Bright
255.8Bright
265.8Bright
275.8Bright
285.8Bright
295.8Bright
305.8Bright
315.8Bright
Planning a trip in January

Hazard calendar for Piraí

In seasonPeak

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

Piraí'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 Piraí?

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

3.6
Sightseeing
12th-best month of the year
4.8
Beach & pool
11th-best month of the year

January is a weaker month for outdoor sightseeing in Piraí.

What to pack for Piraí in January

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

In January, Piraí sees daytime highs around 29°C and nights near 22°C. Pack light clothes and rain gear. Worth having: sun protection. About 24 days see rain.

light clothesrain gearsun protection

Sea temperature near Piraí in January

The nearest coast averages about 26°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 55 km away) is warmest in February at about 26°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°28°JanFebMarAprMayJunJulAugSepOctNovDeccoolrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan26Warm
Feb26Warm
Mar26Warm
Apr25Warm
May24Refreshing
Jun23Refreshing
Jul22Refreshing
Aug21Refreshing
Sep21Refreshing
Oct22Refreshing
Nov23Refreshing
Dec24Warm

UV index in Piraí 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 Piraí peaks around February 9 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 12 at about 5 (high).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highHighVery highExtremeFeb 9UV 14Jul 12UV 5
UV index (midday)Level
Jan14Extreme
Feb14Extreme
Mar12Extreme
Apr9Very high
May7High
Jun6High
Jul5High
Aug8Very high
Sep7High
Oct11Extreme
Nov13Extreme
Dec14Extreme

Air quality in 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 Piraí is worst in September — around 33 µg/m³ PM2.5 (moderate), about 2.1× the cleanest month (December, 15 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecModerateSep 1332 µg/m³Dec 2115 µg/m³
PM2.5 (µg/m³)Level
Jan16Moderate
Feb16Moderate
Mar17Moderate
Apr19Moderate
May24Moderate
Jun29Moderate
Jul31Moderate
Aug27Moderate
Sep33Moderate
Oct20Moderate
Nov17Moderate
Dec15Moderate
Location & terrain

Where is Piraí?

Piraí sits at 22.6°S, 43.9°W, 381 m above sea level, in Brazil. The nearest listed city is Pinheiral, 17 km away.

Topography around Piraí

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

Within 3 km, the terrain around Piraí has only modest variations in elevation — a maximum elevation change of 209 m around an average of 430 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 806 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,556 m.

The land around Piraí is covered by trees (51%) and grassland (37%) within 3 km, trees (53%) and grassland (43%) within 16 km, and trees (43%), grassland (31%) and water (20%) within 80 km.

3 km
209 m
16 km
806 m
80 km
2,556 m
treesgrasslandartificial surfaceswater
January weather nearby: Pinheiral 17 km · Barra do Piraí 19 km · Paracambi 19 km · Mendes 20 km · Seropédica 23 km · Volta Redonda 24 km · Japeri 25 km · Universidade Rural 26 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 Piraí (-22.6292°, -43.8981°, elevation 381 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).