Aripuanã weather in September

In September, Aripuanã sees average daytime highs of 33°C and overnight lows near 23°C, with 81 mm of rain across 12.6 wet days and about 11.9 hours of daylight. It is the 2nd-warmest and 8th-wettest month of the year here.

Highs ease over the month, from about 34°C in the first days to 32°C by the end. The sky is clear or mostly clear about 35% of the time in September, and the air most often feels oppressive.

Daylight stretches from about 11 h 48 min at the start of September to 12 h 06 min by month's end. Set against the rest of the year, September is Aripuanã's 4th-clearest and 4th-windiest month. For the whole year in context, see Aripuanã's year-round climate.

Daytime high
33°
2nd warmest
Overnight low
23°
12th coldest
Rainfall
81 mm
12.6 wet days
Daylight
11 h 54 min
6:54 AM – 6:50 PM
Cloud cover
55%
4th clearest
Wind
6 km/h
4th windiest
Solar energy
5.57 kWh/m²
Travel score
3.2
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 34°C in the first days to 32°C by the end.

A typical September day in Aripuanã reaches about 33°C in the afternoon and slips back to 23°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 30°C and 36°C. Set against its neighbours, September runs about 1°C cooler than August and about 2°C warmer than October.

20°25°30°35°40°151015202530
Avg high (°C)Avg low (°C)
13422
23422
33422
43422
53422
63422
73422
83422
93422
103423
113423
123423
133423
143323
153323
163323
173323
183323
193323
203323
213323
223323
233323
243323
253323
263323
273323
283223
293223
303223

How September really feels in Aripuanã

Once humidity and wind are folded in, September averages 30 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
30
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

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

Aripuanã weather by month

How September compares with the rest of the year at a glance. September is the 2nd-warmest and 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan29° / 22°32229.312.52.9
Feb29° / 22°29726.412.32.9
Mar29° / 22°28129.212.12.9
Apr30° / 22°1852511.83.2
May30° / 22°7312.911.54.6
Jun31° / 21°14311.45.2
Jul33° / 21°71.411.54.6
Aug34° / 22°173.311.73.5
Sep33° / 23°8112.611.93.2
Oct32° / 23°18022.612.23.0
Nov30° / 22°22725.312.53.0
Dec29° / 22°30028.112.63.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 35% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 22% of September, with mostly cloudy or overcast conditions the remaining 43%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
17426
27426
37228
47129
57030
66931
76733
86733
96535
106535
116337
126238
136040
145941
155743
165644
175545
185446
195347
205248
214951
224951
234852
244654
254555
264456
274357
284258
294159
304159

Chance of precipitation in September

Any precipitation

Aripuanã gets around 81 mm of rain over 12.6 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 41% and peaks near 61% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
124
225
326
427
528
629
730
831
932
1033
1134
1235
1337
1438
1539
1641
1743
1844
1946
2047
2149
2250
2352
2454
2555
2657
2758
2859
2960
3061

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the oppressive band about 56% of days. Sticky, muggy-or-worse air turns up on roughly 80% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
17111936280
26101836290
36101837300
4591837310
5591836330
6481836340
7481835360
8471834370
9371733390
10361732420
11361730440
12361629460
13251628490
14251526520
15241525540
16141424570
17131323600
18131221630
19131120650
20121119670
21121018690
2212917710
2302816740
2402715760
2501614790
2601513810
2701513810
2801412830
2901412821
3001311841

Wind in September

Winds average 6 km/h in September.

Across September, daily wind ranges from about 5 km/h on the calmest days to 6 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
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
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 48 min at the start of September to 12 h 06 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 18 minutes over September. Sunrise moves from 7:03 AM to 6:45 AM, and sunset from 6:52 PM to 6:49 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.87:036:52
211.87:036:52
311.87:026:51
411.87:026:51
511.87:016:51
611.87:006:51
711.97:006:51
811.96:596:51
911.96:586:51
1011.96:586:51
1111.96:576:51
1211.96:566:51
1311.96:566:51
1411.96:556:51
1511.96:546:51
1611.96:546:50
1712.06:536:50
1812.06:526:50
1912.06:526:50
2012.06:516:50
2112.06:506:50
2212.06:506:50
2312.06:496:50
2412.06:496:50
2512.06:486:50
2612.06:476:50
2712.16:476:50
2812.16:466:50
2912.16:456:50
3012.16:456:49

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.57 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 4.45 kWh/m² to a high of 5.57 kWh/m² in September across the year — September's 5.57 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
15.5Bright
25.5Bright
35.5Bright
45.5Bright
55.6Bright
65.6Bright
75.6Bright
85.6Bright
95.6Bright
105.6Bright
115.6Bright
125.6Bright
135.6Bright
145.6Bright
155.6Bright
165.6Bright
175.6Bright
185.6Bright
195.6Bright
205.6Bright
215.6Bright
225.6Bright
235.6Bright
245.6Bright
255.6Bright
265.6Bright
275.6Bright
285.6Bright
295.6Bright
305.6Bright
Planning a trip in September

Hazard calendar for Aripuanã

In seasonPeak

None of Aripuanã's seasonal hazards are active in September. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Aripuanã's monsoon runs October–April, when most of the year's rain falls.

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

Is September a good time to visit Aripuanã?

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

3.2
Sightseeing
5th-best month of the year
5.8
Beach & pool
5th-best month of the year

September is a weaker month for outdoor sightseeing in Aripuanã.

What to pack for Aripuanã in September

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

In September, Aripuanã sees daytime highs around 33°C and nights near 23°C. Pack light clothes. Worth having: rain gear and sun protection. About 13 days see rain.

light clothesrain gearsun protection

UV index in Aripuanã in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 4 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Aripuanã peaks around February 16 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near September 14 at about 5 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highHighExtremeFeb 16UV 15Sep 14UV 5
UV index (midday)Level
Jan14Extreme
Feb15Extreme
Mar15Extreme
Apr13Extreme
May10Very high
Jun9Very high
Jul9Very high
Aug8Very high
Sep4Moderate
Oct11Extreme
Nov13Extreme
Dec13Extreme

Air quality in Aripuanã in September

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where September falls, not just the annual average.

Air quality in Aripuanã is worst in September — around 89 µg/m³ PM2.5 (unhealthy), about 14.4× the cleanest month (July, 6 µg/m³).

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

0306090JanFebMarAprMayJunJulAugSepOctNovDecGoodUnhealthyModerateSep 1583 µg/m³Jul 107 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb10Good
Mar10Good
Apr9Good
May8Good
Jun8Good
Jul6Good
Aug41Poor
Sep89Unhealthy
Oct26Moderate
Nov17Moderate
Dec12Moderate
Location & terrain

Where is Aripuanã?

Aripuanã sits at 10.2°S, 59.4°W, 191 m above sea level, in Brazil. The nearest listed city is Colniza, 97 km away.

Pimenta BuenoCacoalBrasnorteJi Paraná

Topography around Aripuanã

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

Within 3 km, the terrain around Aripuanã has only modest variations in elevation — a maximum elevation change of 193 m around an average of 231 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 284 m; within 80 km, significant variations in elevation — a maximum elevation change of 449 m.

The land around Aripuanã is covered by trees (53%) and grassland (29%) within 3 km, trees (65%) and grassland (32%) within 16 km, and trees (81%) within 80 km.

3 km
193 m
16 km
284 m
80 km
449 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Colniza 97 km · Juína 158 km · Espigão dOeste 227 km · Juara 243 km · Pimenta Bueno 253 km · Cacoal 259 km · Brasnorte 268 km · Ji Paraná 285 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 Aripuanã (-10.1765°, -59.4491°, elevation 191 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).