Itaboraí weather in January

In January, Itaboraí sees average daytime highs of 31°C and overnight lows near 23°C, with 259 mm of rain across 21.3 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 31°C through the month. The sky is clear or mostly clear about 22% 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 h 06 min by month's end. Set against the rest of the year, January is Itaboraí's 10th-clearest and 8th-windiest month. For the whole year in context, see Itaboraí's year-round climate.

Daytime high
31°
2nd warmest
Overnight low
23°
12th coldest
Rainfall
259 mm
21.3 wet days
Daylight
13 h 18 min
6:23 AM – 7:38 PM
Cloud cover
70%
10th clearest
Wind
6 km/h
8th windiest
Solar energy
5.89 kWh/m²
Travel score
3.4
out of 10

Itaboraí is human settlement in Brazil.

Air quality
Good
PM2.5 8 µg/m³ · 2015

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 31°C through the month.

A typical January day in Itaboraí reaches about 31°C in the afternoon and slips back to 23°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 26°C and 34°C. Set against its neighbours, January runs about 1°C warmer than December and on par with February.

20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
13023
23023
33023
43023
53023
63023
73023
83023
93023
103023
113023
123023
133123
143123
153123
163123
173123
183123
193123
203123
213123
223123
233123
243123
253123
263123
273123
283123
293123
303123
313123

How January really feels in Itaboraí

Once humidity and wind are folded in, January averages 31 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
31
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.

Itaboraí 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
Jan31° / 23°25921.313.23.4
Feb31° / 23°19918.112.83.5
Mar30° / 23°22021.912.23.8
Apr28° / 21°10814.211.55.4
May26° / 19°771110.96.7
Jun26° / 18°44710.67.4
Jul25° / 17°447.210.77.6
Aug26° / 17°437.311.27.4
Sep26° / 19°8210.911.96.5
Oct27° / 20°11213.512.55.8
Nov28° / 21°21018.713.14.8
Dec29° / 23°25421.613.43.8

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 22% 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 66%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13268
23367
33268
43268
53268
63268
73169
83169
93268
103367
113367
123367
133565
143466
153466
163565
173466
183466
193466
203466
213466
223565
233565
243664
253664
263763
273763
283763
293862
303862
313961

Chance of precipitation in January

Any precipitation

Itaboraí gets around 259 mm of rain over 21.3 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 69% and peaks near 75% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%80%151015202531
Rain chance (%)
175
274
374
473
572
671
770
869
969
1068
1167
1267
1367
1467
1567
1667
1767
1868
1968
2068
2168
2268
2368
2468
2568
2668
2767
2867
2967
3067
3166

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 71% of days. Sticky, muggy-or-worse air turns up on roughly 99% of them.

0%25%50%75%100%151015202531
Humid (%)Muggy (%)Oppressive (%)Miserable (%)
11137412
21137412
31137412
41137313
51137313
61137313
71137313
81137214
91137214
101137214
111137214
121137214
131137115
141137115
151137115
161137115
171137115
181137016
191137016
201136917
211136917
221136917
231136818
241136818
251136818
261126918
271126918
281126918
290127018
300117118
310117118

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 h 06 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 18 minutes over January. Sunrise moves from 6:13 AM to 6:33 AM, and sunset from 7:36 PM to 7:36 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.46:137:36
213.46:147:36
313.46:157:36
413.46:157:37
513.46:167:37
613.36:167:37
713.36:177:37
813.36:187:38
913.36:187:38
1013.36:197:38
1113.36:207:38
1213.36:207:38
1313.36:217:38
1413.36:227:38
1513.36:227:38
1613.36:237:38
1713.26:247:38
1813.26:247:38
1913.26:257:38
2013.26:267:38
2113.26:277:38
2213.26:277:38
2313.26:287:38
2413.26:297:38
2513.16:297:38
2613.16:307:38
2713.16:317:37
2813.16:317:37
2913.16:327:37
3013.16:337:37
3113.16:337:36

Solar energy in January

Daily solar energy (kWh/m²)

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

For context, solar energy here swings from a low near 3.42 kWh/m² to a high of 6.06 kWh/m² in February across the year — January's 5.89 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.8Bright
25.8Bright
35.9Bright
45.9Bright
55.9Bright
65.9Bright
75.9Bright
85.9Bright
95.9Bright
105.9Bright
115.9Bright
125.9Bright
135.9Bright
145.9Bright
155.9Bright
165.9Bright
175.9Bright
185.9Bright
196.0Bright
206.0Bright
216.0Bright
226.0Bright
236.0Bright
246.0Intense
256.0Intense
266.0Intense
276.0Intense
286.0Intense
296.1Intense
306.1Intense
316.1Intense
Planning a trip in January

Hazard calendar for Itaboraí

In seasonPeak

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

Itaboraí'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 Itaboraí?

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

3.4
Sightseeing
12th-best month of the year
4.9
Beach & pool
12th-best month of the year

January is a weaker month for outdoor sightseeing in Itaboraí.

What to pack for Itaboraí in January

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

In January, Itaboraí sees daytime highs around 31°C and nights near 23°C. Pack light clothes and rain gear. Worth having: sun protection. About 21 days see rain.

light clothesrain gearsun protection

Sea temperature near Itaboraí 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 42 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 Itaboraí 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 Itaboraí peaks around January 13 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 13 at about 5 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highHighHighVery highExtremeJan 13UV 14Jul 13UV 5
UV index (midday)Level
Jan14Extreme
Feb13Extreme
Mar12Extreme
Apr9Very high
May7High
Jun6High
Jul5Moderate
Aug8Very high
Sep7High
Oct12Extreme
Nov13Extreme
Dec14Extreme
Location & terrain

Where is Itaboraí?

Itaboraí sits at 22.7°S, 42.9°W, 47 m above sea level, in Brazil. The nearest listed city is Tanguá, 15 km away.

Topography around Itaboraí

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

Within 3 km, the terrain around Itaboraí has only modest variations in elevation — a maximum elevation change of 76 m around an average of 22 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 741 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,252 m.

The land around Itaboraí is covered by artificial surfaces (36%), trees (34%) and grassland (29%) within 3 km, grassland (42%) and trees (38%) within 16 km, and trees (42%), water (28%) and grassland (22%) within 80 km.

3 km
76 m
16 km
741 m
80 km
2,252 m
treesgrasslandartificial surfaceswaterwetlandmangroves
January weather nearby: Tanguá 15 km · Maricá 20 km · Magé 21 km · Rio Bonito 26 km · Guapimirim 26 km · Niterói 29 km · São Pedro 37 km · Rio de Janeiro 38 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 Itaboraí (-22.7444°, -42.8594°, elevation 47 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).