Rio Branco weather in January

In January, Rio Branco sees average daytime highs of 30°C and overnight lows near 23°C, with 255 mm of rain across 27.7 wet days and about 12.5 hours of daylight. It is the 9th-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 1% of the time in January, and the air most often feels oppressive.

Daylight stretches from about 12 h 36 min at the start of January to 12 h 24 min by month's end. Set against the rest of the year, January is Rio Branco's 11th-clearest and 5th-windiest month. For the whole year in context, see Rio Branco's year-round climate.

Daytime high: 30°; 9th warmest
Overnight low: 23°; 12th coldest
Rainfall: 255 mm; 27.7 wet days
Daylight: 12 h 30 min; 5:25 AM – 5:56 PM
Cloud cover: 88%; 11th clearest
Wind: 6 km/h; 5th windiest
Solar energy: 4.83 kWh/m²
Travel score: 2.8; out of 10

Rio Branco is human settlement in Acre, Brazil.

Founded: 1882

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

← December Rio Branco year-round climate February →Best places to visit in January

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

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 Rio Branco reaches about 30°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 28°C and 32°C. Set against its neighbours, January runs on par with December and on par with February.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Avg high (°C)	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30
Avg low (°C)	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23

	Avg high (°C)	Avg low (°C)
1	30	23
2	30	23
3	30	23
4	30	23
5	30	23
6	30	23
7	30	23
8	30	23
9	30	23
10	30	23
11	30	23
12	30	23
13	30	23
14	30	23
15	30	23
16	30	23
17	30	23
18	30	23
19	30	23
20	30	23
21	30	23
22	30	23
23	30	23
24	30	23
25	30	23
26	30	23
27	30	23
28	30	23
29	30	23
30	30	23
31	30	23

How January really feels in Rio Branco

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

heat index over the day's high

Days feeling ≤ 0°C

wind chill below the day's low

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

Rio Branco weather by month

How January compares with the rest of the year at a glance. January is the 9th-warmest and 1st-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	30° / 23°	255	27.7	12.5	2.8
Feb	30° / 23°	240	25	12.3	2.8
Mar	30° / 23°	249	27.2	12.1	2.8
Apr	30° / 22°	160	22.8	11.8	3.2
May	30° / 21°	76	15.4	11.5	4.3
Jun	30° / 20°	30	6.8	11.4	5.3
Jul	31° / 20°	21	4.2	11.5	5.1
Aug	33° / 20°	38	6.3	11.7	4.0
Sep	33° / 22°	76	11.9	11.9	3.2
Oct	33° / 23°	137	19.5	12.2	2.8
Nov	31° / 23°	199	22.9	12.5	2.8
Dec	30° / 23°	246	26.3	12.6	2.9

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 1% of the time in January.

Beyond those clear spells, partly cloudy skies cover about 5% of January, with mostly cloudy or overcast conditions the remaining 94%.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Clearer (%)	7	7	6	6	6	6	5	5	5	5	5	5	5	5	5	5	5	5	6	6	6	6	6	6	6	6	6	6	6	6	6
Cloudier (%)	93	93	94	94	94	94	95	95	95	95	95	95	95	95	95	95	95	95	94	94	94	94	94	94	94	94	94	94	94	94	94

	Clearer (%)	Cloudier (%)
1	7	93
2	7	93
3	6	94
4	6	94
5	6	94
6	6	94
7	5	95
8	5	95
9	5	95
10	5	95
11	5	95
12	5	95
13	5	95
14	5	95
15	5	95
16	5	95
17	5	95
18	5	95
19	6	94
20	6	94
21	6	94
22	6	94
23	6	94
24	6	94
25	6	94
26	6	94
27	6	94
28	6	94
29	6	94
30	6	94
31	6	94

Chance of precipitation in January

Any precipitation

Rio Branco gets around 255 mm of rain over 27.7 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 89% and peaks near 91% on the wettest days.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Rain chance (%)	85	86	86	86	86	87	87	88	88	89	89	90	90	90	90	91	91	91	91	90	90	90	90	90	89	89	89	89	89	89	89

	Rain chance (%)
1	85
2	86
3	86
4	86
5	86
6	87
7	87
8	88
9	88
10	89
11	89
12	90
13	90
14	90
15	90
16	91
17	91
18	91
19	91
20	90
21	90
22	90
23	90
24	90
25	89
26	89
27	89
28	89
29	89
30	89
31	89

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 72% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Oppressive (%)	75	75	75	75	75	75	75	75	76	76	75	75	75	74	74	73	72	72	71	70	70	69	68	68	68	67	67	67	67	66	66
Miserable (%)	25	25	25	25	25	25	25	25	24	24	25	25	25	26	26	27	28	28	29	30	30	31	32	32	32	33	33	33	33	34	34

	Oppressive (%)	Miserable (%)
1	75	25
2	75	25
3	75	25
4	75	25
5	75	25
6	75	25
7	75	25
8	75	25
9	76	24
10	76	24
11	75	25
12	75	25
13	75	25
14	74	26
15	74	26
16	73	27
17	72	28
18	72	28
19	71	29
20	70	30
21	70	30
22	69	31
23	68	32
24	68	32
25	68	32
26	67	33
27	67	33
28	67	33
29	67	33
30	66	34
31	66	34

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.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Wind speed (km/h)	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6
Feels	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm

	Wind speed (km/h)	Feels
1	6	calm
2	6	calm
3	6	calm
4	6	calm
5	6	calm
6	6	calm
7	6	calm
8	6	calm
9	6	calm
10	6	calm
11	6	calm
12	6	calm
13	6	calm
14	6	calm
15	6	calm
16	6	calm
17	6	calm
18	6	calm
19	6	calm
20	6	calm
21	6	calm
22	6	calm
23	6	calm
24	6	calm
25	6	calm
26	6	calm
27	6	calm
28	6	calm
29	6	calm
30	6	calm
31	6	calm

Sunrise & sunset in January

DaylightNight

Daylight runs from about 12 h 36 min at the start of January to 12 h 24 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 12 minutes over January. Sunrise moves from 5:17 AM to 5:31 AM, and sunset from 5:52 PM to 5:58 PM.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Daylight (h)	12.6	12.6	12.6	12.6	12.6	12.6	12.6	12.6	12.6	12.5	12.5	12.5	12.5	12.5	12.5	12.5	12.5	12.5	12.5	12.5	12.5	12.5	12.5	12.5	12.5	12.5	12.5	12.5	12.5	12.4	12.4
Sunrise (AM)	5:17	5:18	5:18	5:19	5:19	5:20	5:20	5:21	5:21	5:22	5:22	5:23	5:23	5:24	5:24	5:25	5:25	5:26	5:26	5:27	5:27	5:28	5:28	5:29	5:29	5:29	5:30	5:30	5:31	5:31	5:31
Sunset (PM)	5:52	5:52	5:52	5:53	5:53	5:53	5:54	5:54	5:54	5:55	5:55	5:55	5:56	5:56	5:56	5:56	5:56	5:57	5:57	5:57	5:57	5:57	5:57	5:57	5:58	5:58	5:58	5:58	5:58	5:58	5:58

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	12.6	5:17	5:52
2	12.6	5:18	5:52
3	12.6	5:18	5:52
4	12.6	5:19	5:53
5	12.6	5:19	5:53
6	12.6	5:20	5:53
7	12.6	5:20	5:54
8	12.6	5:21	5:54
9	12.6	5:21	5:54
10	12.5	5:22	5:55
11	12.5	5:22	5:55
12	12.5	5:23	5:55
13	12.5	5:23	5:56
14	12.5	5:24	5:56
15	12.5	5:24	5:56
16	12.5	5:25	5:56
17	12.5	5:25	5:56
18	12.5	5:26	5:57
19	12.5	5:26	5:57
20	12.5	5:27	5:57
21	12.5	5:27	5:57
22	12.5	5:28	5:57
23	12.5	5:28	5:57
24	12.5	5:29	5:57
25	12.5	5:29	5:58
26	12.5	5:29	5:58
27	12.5	5:30	5:58
28	12.5	5:30	5:58
29	12.5	5:31	5:58
30	12.4	5:31	5:58
31	12.4	5:31	5:58

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 4.83 kWh/m².

For context, solar energy here swings from a low near 4.25 kWh/m² to a high of 5.57 kWh/m² in September across the year — January's 4.83 kWh/m² falls in the middle.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Solar energy (kWh/m²)	4.9	4.9	4.9	4.9	4.9	4.9	4.8	4.8	4.8	4.8	4.8	4.8	4.8	4.8	4.8	4.8	4.8	4.8	4.8	4.8	4.8	4.8	4.8	4.8	4.8	4.9	4.9	4.9	4.9	4.8	4.8
Level	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright

	Solar energy (kWh/m²)	Level
1	4.9	Bright
2	4.9	Bright
3	4.9	Bright
4	4.9	Bright
5	4.9	Bright
6	4.9	Bright
7	4.8	Bright
8	4.8	Bright
9	4.8	Bright
10	4.8	Bright
11	4.8	Bright
12	4.8	Bright
13	4.8	Bright
14	4.8	Bright
15	4.8	Bright
16	4.8	Bright
17	4.8	Bright
18	4.8	Bright
19	4.8	Bright
20	4.8	Bright
21	4.8	Bright
22	4.8	Bright
23	4.8	Bright
24	4.8	Bright
25	4.8	Bright
26	4.9	Bright
27	4.9	Bright
28	4.9	Bright
29	4.9	Bright
30	4.8	Bright
31	4.8	Bright

Planning a trip in January

Hazard calendar for Rio Branco

In seasonPeak

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

Rio Branco's rainy season runs October–April, 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 Rio Branco?

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

2.8

Sightseeing

8th-best month of the year

3.9

Beach & pool

11th-best month of the year

January is a weaker month for outdoor sightseeing in Rio Branco.

What to pack for Rio Branco in January

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

In January, Rio Branco sees daytime highs around 30°C and nights near 23°C. Pack light clothes and rain gear. Worth having: sun protection. About 28 days see rain.

light clothesrain gearsun protection

UV index in Rio Branco 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 Rio Branco peaks around January 20 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near September 12 at about 5 (moderate).

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

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	15	15	14	13	11	9	8	7	4	12	13	13
Level	Extreme	Extreme	Extreme	Extreme	Extreme	Very high	Very high	High	Moderate	Extreme	Extreme	Extreme

	UV index (midday)	Level
Jan	15	Extreme
Feb	15	Extreme
Mar	14	Extreme
Apr	13	Extreme
May	11	Extreme
Jun	9	Very high
Jul	8	Very high
Aug	7	High
Sep	4	Moderate
Oct	12	Extreme
Nov	13	Extreme
Dec	13	Extreme

Air quality in Rio Branco 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 Rio Branco is worst in September — around 100 µg/m³ PM2.5 (unhealthy), about 12.4× the cleanest month (June, 8 µg/m³).

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

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
PM2.5 (µg/m³)	13	13	13	10	8	8	14	65	100	27	13	11
Level	Moderate	Moderate	Moderate	Good	Good	Good	Moderate	Unhealthy	Unhealthy	Moderate	Moderate	Good

	PM2.5 (µg/m³)	Level
Jan	13	Moderate
Feb	13	Moderate
Mar	13	Moderate
Apr	10	Good
May	8	Good
Jun	8	Good
Jul	14	Moderate
Aug	65	Unhealthy
Sep	100	Unhealthy
Oct	27	Moderate
Nov	13	Moderate
Dec	11	Good

Location & terrain

Where is Rio Branco?

Rio Branco sits at 10.0°S, 67.8°W, 153 m above sea level, in Brazil. The nearest listed city is Senador Guiomard, 21 km away.

Topography around Rio Branco

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

Within 3 km, the terrain around Rio Branco has only modest variations in elevation — a maximum elevation change of 50 m around an average of 142 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 103 m; within 80 km, only modest variations in elevation — a maximum elevation change of 165 m.

The land around Rio Branco is covered by artificial surfaces (54%) and trees (33%) within 3 km, trees (46%) and grassland (46%) within 16 km, and trees (61%) and grassland (38%) within 80 km.

3 km

50 m

artificial surfaces 54%

16 km

103 m

trees 46%

80 km

165 m

trees 61%

treesgrasslandartificial surfaceswater

← December Rio Branco year-round climate February →Best places to visit in January

January weather nearby: Senador Guiomard 21 km · Porto Acre 53 km · Plácido de Castro 79 km · Xapuri 107 km · Sena Madureira 139 km · Boca do Acre 143 km · Brasiléia 155 km · Epitaciolândia 155 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

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 Rio Branco (-9.9747°, -67.81°, elevation 153 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).

	Avg high (°C)	Avg low (°C)
1	30	23
2	30	23
3	30	23
4	30	23
5	30	23
6	30	23
7	30	23
8	30	23
9	30	23
10	30	23
11	30	23
12	30	23
13	30	23
14	30	23
15	30	23
16	30	23
17	30	23
18	30	23
19	30	23
20	30	23
21	30	23
22	30	23
23	30	23
24	30	23
25	30	23
26	30	23
27	30	23
28	30	23
29	30	23
30	30	23
31	30	23

	Clearer (%)	Cloudier (%)
1	7	93
2	7	93
3	6	94
4	6	94
5	6	94
6	6	94
7	5	95
8	5	95
9	5	95
10	5	95
11	5	95
12	5	95
13	5	95
14	5	95
15	5	95
16	5	95
17	5	95
18	5	95
19	6	94
20	6	94
21	6	94
22	6	94
23	6	94
24	6	94
25	6	94
26	6	94
27	6	94
28	6	94
29	6	94
30	6	94
31	6	94

	Rain chance (%)
1	85
2	86
3	86
4	86
5	86
6	87
7	87
8	88
9	88
10	89
11	89
12	90
13	90
14	90
15	90
16	91
17	91
18	91
19	91
20	90
21	90
22	90
23	90
24	90
25	89
26	89
27	89
28	89
29	89
30	89
31	89

	Oppressive (%)	Miserable (%)
1	75	25
2	75	25
3	75	25
4	75	25
5	75	25
6	75	25
7	75	25
8	75	25
9	76	24
10	76	24
11	75	25
12	75	25
13	75	25
14	74	26
15	74	26
16	73	27
17	72	28
18	72	28
19	71	29
20	70	30
21	70	30
22	69	31
23	68	32
24	68	32
25	68	32
26	67	33
27	67	33
28	67	33
29	67	33
30	66	34
31	66	34

	Avg high (°C)	Avg low (°C)
1	30	23
2	30	23
3	30	23
4	30	23
5	30	23
6	30	23
7	30	23
8	30	23
9	30	23
10	30	23
11	30	23
12	30	23
13	30	23
14	30	23
15	30	23
16	30	23
17	30	23
18	30	23
19	30	23
20	30	23
21	30	23
22	30	23
23	30	23
24	30	23
25	30	23
26	30	23
27	30	23
28	30	23
29	30	23
30	30	23
31	30	23

	Clearer (%)	Cloudier (%)
1	7	93
2	7	93
3	6	94
4	6	94
5	6	94
6	6	94
7	5	95
8	5	95
9	5	95
10	5	95
11	5	95
12	5	95
13	5	95
14	5	95
15	5	95
16	5	95
17	5	95
18	5	95
19	6	94
20	6	94
21	6	94
22	6	94
23	6	94
24	6	94
25	6	94
26	6	94
27	6	94
28	6	94
29	6	94
30	6	94
31	6	94

	Rain chance (%)
1	85
2	86
3	86
4	86
5	86
6	87
7	87
8	88
9	88
10	89
11	89
12	90
13	90
14	90
15	90
16	91
17	91
18	91
19	91
20	90
21	90
22	90
23	90
24	90
25	89
26	89
27	89
28	89
29	89
30	89
31	89

	Oppressive (%)	Miserable (%)
1	75	25
2	75	25
3	75	25
4	75	25
5	75	25
6	75	25
7	75	25
8	75	25
9	76	24
10	76	24
11	75	25
12	75	25
13	75	25
14	74	26
15	74	26
16	73	27
17	72	28
18	72	28
19	71	29
20	70	30
21	70	30
22	69	31
23	68	32
24	68	32
25	68	32
26	67	33
27	67	33
28	67	33
29	67	33
30	66	34
31	66	34

	Avg high (°C)	Avg low (°C)
1	30	23
2	30	23
3	30	23
4	30	23
5	30	23
6	30	23
7	30	23
8	30	23
9	30	23
10	30	23
11	30	23
12	30	23
13	30	23
14	30	23
15	30	23
16	30	23
17	30	23
18	30	23
19	30	23
20	30	23
21	30	23
22	30	23
23	30	23
24	30	23
25	30	23
26	30	23
27	30	23
28	30	23
29	30	23
30	30	23
31	30	23

	Clearer (%)	Cloudier (%)
1	7	93
2	7	93
3	6	94
4	6	94
5	6	94
6	6	94
7	5	95
8	5	95
9	5	95
10	5	95
11	5	95
12	5	95
13	5	95
14	5	95
15	5	95
16	5	95
17	5	95
18	5	95
19	6	94
20	6	94
21	6	94
22	6	94
23	6	94
24	6	94
25	6	94
26	6	94
27	6	94
28	6	94
29	6	94
30	6	94
31	6	94

	Rain chance (%)
1	85
2	86
3	86
4	86
5	86
6	87
7	87
8	88
9	88
10	89
11	89
12	90
13	90
14	90
15	90
16	91
17	91
18	91
19	91
20	90
21	90
22	90
23	90
24	90
25	89
26	89
27	89
28	89
29	89
30	89
31	89

	Oppressive (%)	Miserable (%)
1	75	25
2	75	25
3	75	25
4	75	25
5	75	25
6	75	25
7	75	25
8	75	25
9	76	24
10	76	24
11	75	25
12	75	25
13	75	25
14	74	26
15	74	26
16	73	27
17	72	28
18	72	28
19	71	29
20	70	30
21	70	30
22	69	31
23	68	32
24	68	32
25	68	32
26	67	33
27	67	33
28	67	33
29	67	33
30	66	34
31	66	34