Rio Branco weather in October

In October, Rio Branco sees average daytime highs of 33°C and overnight lows near 23°C, with 137 mm of rain across 19.5 wet days and about 12.2 hours of daylight. It is the 3rd-warmest and 7th-wettest month of the year here.

Day-to-day highs hold fairly steady near 33°C through the month. The sky is clear or mostly clear about 11% of the time in October, and the air most often feels oppressive.

Daylight stretches from about 12 h 06 min at the start of October to 12 h 24 min by month's end. Set against the rest of the year, October is Rio Branco's 6th-clearest and 6th-windiest month. For the whole year in context, see Rio Branco's year-round climate.

Daytime high
33°
3rd warmest
Overnight low
23°
8th coldest
Rainfall
137 mm
19.5 wet days
Daylight
12 h 12 min
5:10 AM – 5:23 PM
Cloud cover
74%
6th clearest
Wind
6 km/h
6th windiest
Solar energy
5.5 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.

Temperature in October

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 33°C through the month.

A typical October day in Rio Branco reaches about 33°C in the afternoon and slips back to 23°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 29°C and 35°C. Set against its neighbours, October runs about 1°C cooler than September and about 1°C warmer than November.

20°25°30°35°40°151015202531
Avg high (°C)Avg low (°C)
13323
23323
33323
43323
53323
63323
73323
83323
93323
103323
113323
123323
133323
143323
153323
163323
173323
183223
193223
203223
213223
223223
233223
243223
253223
263223
273223
283223
293223
303223
313223

How October really feels in Rio Branco

Once humidity and wind are folded in, October 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 October is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Rio Branco weather by month

How October compares with the rest of the year at a glance. October is the 3rd-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 23°25527.712.52.8
Feb30° / 23°2402512.32.8
Mar30° / 23°24927.212.12.8
Apr30° / 22°16022.811.83.2
May30° / 21°7615.411.54.3
Jun30° / 20°306.811.45.3
Jul31° / 20°214.211.55.1
Aug33° / 20°386.311.74.0
Sep33° / 22°7611.911.93.2
Oct33° / 23°13719.512.22.8
Nov31° / 23°19922.912.52.8
Dec30° / 23°24626.312.62.9

Cloud cover in October

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 11% of the time in October.

Beyond those clear spells, partly cloudy skies cover about 15% of October, with mostly cloudy or overcast conditions the remaining 74%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13862
23763
33763
43664
53565
63664
73466
83466
93367
103268
113169
123169
132971
142971
152773
162575
172575
182476
192278
202179
212179
221981
231882
241882
251684
261684
271585
281585
291585
301486
311486

Chance of precipitation in October

Any precipitation

Rio Branco gets around 137 mm of rain over 19.5 wet days in October. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 62% and peaks near 72% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%151015202531
Rain chance (%)
151
251
352
453
553
654
755
855
956
1057
1157
1258
1359
1460
1561
1662
1763
1864
1965
2066
2167
2268
2369
2470
2571
2671
2772
2872
2972
3072
3172

Humidity in October

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, October lands in the oppressive band about 79% of days. Sticky, muggy-or-worse air turns up on roughly 99% of them.

0%25%50%75%100%151015202531
Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1129835
2129835
3129826
4128827
5128827
6118828
7118819
8117829
91178110
101178011
110168211
120168112
130158113
140158014
150158014
160048115
170048016
180038017
190037918
200037819
210027919
220027820
230027721
240027721
250027622
260027622
270027523
280037423
290037324
300037324
310037324

Wind in October

Winds average 6 km/h in October.

Across October, 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 October

DaylightNight

Daylight runs from about 12 h 06 min at the start of October to 12 h 24 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 18 minutes over October. Sunrise moves from 5:18 AM to 5:04 AM, and sunset from 5:23 PM to 5:25 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.15:185:23
212.15:175:23
312.15:165:23
412.15:165:23
512.15:155:23
612.15:155:23
712.15:145:23
812.25:145:23
912.25:135:23
1012.25:125:23
1112.25:125:23
1212.25:115:23
1312.25:115:23
1412.25:105:23
1512.25:105:23
1612.25:105:23
1712.25:095:23
1812.25:095:23
1912.35:085:23
2012.35:085:23
2112.35:075:24
2212.35:075:24
2312.35:075:24
2412.35:065:24
2512.35:065:24
2612.35:065:24
2712.35:055:24
2812.35:055:25
2912.35:055:25
3012.35:045:25
3112.45:045:25

Solar energy in October

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in October, about 5.5 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 — October's 5.5 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
105.6Bright
115.6Bright
125.6Bright
135.6Bright
145.5Bright
155.5Bright
165.5Bright
175.5Bright
185.5Bright
195.5Bright
205.5Bright
215.5Bright
225.5Bright
235.4Bright
245.4Bright
255.4Bright
265.4Bright
275.4Bright
285.3Bright
295.3Bright
305.3Bright
315.3Bright
Planning a trip in October

Hazard calendar for Rio Branco

In seasonPeak

In October, 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 October a good time to visit Rio Branco?

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

2.8
Sightseeing
8th-best month of the year
4.8
Beach & pool
6th-best month of the year

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

What to pack for Rio Branco in October

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

In October, Rio Branco sees daytime highs around 33°C and nights near 23°C. Pack light clothes and rain gear. Worth having: sun protection. About 20 days see rain.

light clothesrain gearsun protection

UV index in Rio Branco in October

LowModerateHighVery highExtreme

Clear-sky midday UV in October peaks around 12 (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.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highHighExtremeJan 20UV 15Sep 12UV 5
UV index (midday)Level
Jan15Extreme
Feb15Extreme
Mar14Extreme
Apr13Extreme
May11Extreme
Jun9Very high
Jul8Very high
Aug7High
Sep4Moderate
Oct12Extreme
Nov13Extreme
Dec13Extreme

Air quality in Rio Branco in October

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where October 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).

0306090120JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateUnhealthyModerateGoodSep 1394 µg/m³Jun 98 µg/m³
PM2.5 (µg/m³)Level
Jan13Moderate
Feb13Moderate
Mar13Moderate
Apr10Good
May8Good
Jun8Good
Jul14Moderate
Aug65Unhealthy
Sep100Unhealthy
Oct27Moderate
Nov13Moderate
Dec11Good
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
16 km
103 m
80 km
165 m
treesgrasslandartificial surfaceswater
October 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
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 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).