Açu weather in January

In January, Açu sees average daytime highs of 35°C and overnight lows near 24°C, with 50 mm of rain across 8.7 wet days and about 12.3 hours of daylight. It is the 5th-warmest and 4th-wettest month of the year here.

Day-to-day highs hold fairly steady near 35°C through the month. The sky is clear or mostly clear about 26% of the time in January, and the air most often feels muggy.

Daylight stretches from about 12 h 18 min at the start of January to 12 h 12 min by month's end. Set against the rest of the year, January is Açu's 9th-clearest and 7th-windiest month. For the whole year in context, see Açu's year-round climate.

Daytime high
35°
5th warmest
Overnight low
24°
12th coldest
Rainfall
50 mm
8.7 wet days
Daylight
12 h 18 min
5:28 AM – 5:46 PM
Cloud cover
61%
9th clearest
Wind
14 km/h
7th windiest
Solar energy
5.92 kWh/m²
Travel score
2.7
out of 10

Açu 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 35°C through the month.

A typical January day in Açu reaches about 35°C in the afternoon and slips back to 24°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 32°C and 37°C. Set against its neighbours, January runs about 1°C cooler than December and on par with February.

20°25°30°35°40°151015202531
Avg high (°C)Avg low (°C)
13525
23525
33525
43525
53525
63525
73525
83525
93525
103525
113525
123525
133525
143524
153524
163524
173524
183524
193424
203424
213424
223424
233424
243424
253424
263424
273424
283424
293524
303524
313524

How January really feels in Açu

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.

Açu weather by month

How January compares with the rest of the year at a glance. January is the 5th-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan35° / 24°508.712.32.7
Feb34° / 24°6310.512.22.8
Mar33° / 24°9214.8122.9
Apr33° / 24°8613.311.93.2
May33° / 24°406.711.73.6
Jun33° / 23°244.311.74.1
Jul33° / 22°152.411.74.2
Aug34° / 22°30.411.83.7
Sep35° / 23°10.1123.1
Oct36° / 23°10.112.12.7
Nov36° / 24°20.412.32.7
Dec36° / 24°102.512.32.6

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 26% of the time in January.

Beyond those clear spells, partly cloudy skies cover about 23% of January, with mostly cloudy or overcast conditions the remaining 51%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15545
25446
35446
45347
55248
65248
75149
85050
95050
104951
114852
124852
134753
144753
154654
164654
174654
184654
194555
204654
214654
224654
234654
244753
254753
264852
274852
284951
294951
305050
315050

Chance of precipitation in January

Any precipitation

Açu gets around 50 mm of rain over 8.7 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 28% and peaks near 34% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%151015202531
Rain chance (%)
117
218
318
419
520
620
721
822
923
1024
1125
1226
1328
1429
1530
1631
1732
1832
1933
2033
2134
2234
2334
2434
2534
2634
2734
2833
2933
3032
3131

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 50% of days. Sticky, muggy-or-worse air turns up on roughly 96% of them.

0%25%50%75%100%151015202531
Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1566290
2565300
3465310
4464320
5463330
6461341
7461341
8460351
9459361
10458371
11456391
12455401
13453421
14451441
15349461
16348481
17346491
18345511
19344521
20343531
21342541
22341551
23341551
24340561
25340570
26340570
27341560
28341560
29342550
30343531
31343531

Wind in January

Winds average 14 km/h in January.

Across January, daily wind ranges from about 14 km/h on the calmest days to 16 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
116light breeze
216light breeze
316light breeze
416light breeze
515light breeze
615light breeze
715light breeze
815light breeze
915light breeze
1015light breeze
1115light breeze
1215light breeze
1315light breeze
1415light breeze
1514light breeze
1614light breeze
1714light breeze
1814light breeze
1914light breeze
2014light breeze
2114light breeze
2214light breeze
2314light breeze
2414light breeze
2514light breeze
2614light breeze
2714light breeze
2814light breeze
2914light breeze
3014light breeze
3114light breeze

Sunrise & sunset in January

DaylightNight

Daylight runs from about 12 h 18 min at the start of January to 12 h 12 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 6 minutes over January. Sunrise moves from 5:21 AM to 5:34 AM, and sunset from 5:40 PM to 5:48 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.35:215:40
212.35:225:41
312.35:225:41
412.35:235:42
512.35:235:42
612.35:245:42
712.35:245:43
812.35:255:43
912.35:255:43
1012.35:265:44
1112.35:265:44
1212.35:265:44
1312.35:275:45
1412.35:275:45
1512.35:285:45
1612.35:285:46
1712.35:295:46
1812.35:295:46
1912.35:295:46
2012.35:305:47
2112.35:305:47
2212.35:315:47
2312.35:315:47
2412.35:315:47
2512.35:325:48
2612.35:325:48
2712.35:325:48
2812.35:335:48
2912.35:335:48
3012.25:335:48
3112.25:345:48

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 5.92 kWh/m².

For context, solar energy here swings from a low near 4.66 kWh/m² to a high of 6.8 kWh/m² in October across the year — January's 5.92 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
16.1Intense
26.1Intense
36.1Intense
46.0Intense
56.0Intense
66.0Intense
76.0Bright
86.0Bright
96.0Bright
105.9Bright
115.9Bright
125.9Bright
135.9Bright
145.9Bright
155.9Bright
165.8Bright
175.8Bright
185.8Bright
195.8Bright
205.8Bright
215.8Bright
225.9Bright
235.9Bright
245.9Bright
255.9Bright
265.9Bright
275.9Bright
285.9Bright
296.0Bright
306.0Bright
316.0Bright
Planning a trip in January

Is January a good time to visit Açu?

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

2.7
Sightseeing
9th-best month of the year
5.7
Beach & pool
9th-best month of the year

January is a weaker month for outdoor sightseeing in Açu.

What to pack for Açu in January

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

In January, Açu sees daytime highs around 35°C and nights near 24°C. Pack light clothes. Worth having: rain gear and sun protection. About 9 days see rain.

light clothesrain gearsun protection

UV index in Açu in January

LowModerateHighVery highExtreme

Clear-sky midday UV in January peaks around 13 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Açu peaks around March 15 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 14 at about 10 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highExtremeMar 15UV 15Jul 14UV 10
UV index (midday)Level
Jan13Extreme
Feb14Extreme
Mar15Extreme
Apr14Extreme
May11Extreme
Jun10Very high
Jul10Very high
Aug10Extreme
Sep12Extreme
Oct12Extreme
Nov12Extreme
Dec12Extreme
Location & terrain

Where is Açu?

Açu sits at 5.6°S, 36.9°W, 36 m above sea level, in Brazil. The nearest listed city is Jucurutu, 52 km away.

Topography around Açu

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

Within 3 km, the terrain around Açu has only modest variations in elevation — a maximum elevation change of 78 m around an average of 37 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 132 m; within 80 km, large variations in elevation — a maximum elevation change of 749 m.

The land around Açu is covered by grassland (35%) and artificial surfaces (22%) within 3 km, shrubs (49%) and grassland (35%) within 16 km, and shrubs (66%) and grassland (20%) within 80 km.

3 km
78 m
16 km
132 m
80 km
749 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwaterwetland
January weather nearby: Jucurutu 52 km · Macau 60 km · Mossoró 65 km · Areia Branca 73 km · Lagoa Nova 75 km · Caraúbas 76 km · Guamaré 83 km · Currais Novos 87 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 Açu (-5.5767°, -36.9086°, elevation 36 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. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).