Alto Paraíso weather in September

In September, Alto Paraíso sees average daytime highs of 34°C and overnight lows near 23°C, with 98 mm of rain across 15.7 wet days and about 11.9 hours of daylight. It is the 2nd-warmest and 9th-wettest month of the year here.

Day-to-day highs hold fairly steady near 34°C through the month. The sky is clear or mostly clear about 29% 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 Alto Paraíso's 4th-clearest and 4th-windiest month. For the whole year in context, see Alto Paraíso's year-round climate.

Daytime high
34°
2nd warmest
Overnight low
23°
6th coldest
Rainfall
98 mm
15.7 wet days
Daylight
11 h 54 min
6:09 AM – 6:06 PM
Cloud cover
59%
4th clearest
Wind
5 km/h
4th windiest
Solar energy
5.56 kWh/m²
Travel score
2.8
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 34°C through the month.

A typical September day in Alto Paraíso reaches about 34°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 on par with August and about 1°C warmer than October.

20°25°30°35°40°151015202530
Avg high (°C)Avg low (°C)
13422
23422
33422
43422
53422
63423
73423
83423
93423
103423
113423
123423
133423
143423
153423
163423
173423
183423
193423
203423
213423
223423
233323
243323
253323
263323
273323
283323
293323
303323

How September really feels in Alto Paraíso

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.

Alto Paraíso weather by month

How September compares with the rest of the year at a glance. September is the 2nd-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 23°31128.212.52.7
Feb30° / 23°29126.412.32.7
Mar30° / 23°29228.812.12.7
Apr30° / 23°20125.211.83.0
May30° / 22°10517.911.63.9
Jun31° / 21°296.511.44.8
Jul33° / 21°173.211.54.3
Aug34° / 22°426.611.73.3
Sep34° / 23°9815.711.92.8
Oct33° / 23°16822.512.22.6
Nov31° / 23°2352512.42.7
Dec30° / 23°27227.612.62.7

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 29% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 23% of September, with mostly cloudy or overcast conditions the remaining 49%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
16733
26535
36436
46337
56238
66238
76040
86040
95842
105842
115644
125644
135545
145347
155248
165149
175050
184852
194753
204555
214555
224456
234357
244258
254159
264159
274060
284060
293961
303961

Chance of precipitation in September

Any precipitation

Alto Paraíso gets around 98 mm of rain over 15.7 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 52% and peaks near 64% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
138
239
340
441
542
643
744
845
945
1046
1147
1248
1349
1450
1551
1652
1753
1854
1956
2056
2157
2258
2359
2460
2561
2662
2762
2863
2964
3064

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 72% of days. Sticky, muggy-or-worse air turns up on roughly 92% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
134922593
224822613
324821623
423821633
523821624
613820644
713820644
813719664
912719674
1012718684
1112717694
1212716704
1302616724
1402615734
1502614744
1602613754
1702513755
1802512765
1901511776
2001411786
2101410787
2201410787
230139798
240139798
250138799
260128809
2701287910
2801278010
2901278010
3001278010

Wind in September

Winds average 5 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
155calm
165calm
175calm
185calm
195calm
205calm
215calm
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 6:19 AM to 6:00 AM, and sunset from 6:07 PM to 6:05 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.86:196:07
211.86:186:07
311.86:176:07
411.86:176:07
511.86:166:07
611.96:166:07
711.96:156:07
811.96:146:07
911.96:146:07
1011.96:136:07
1111.96:126:06
1211.96:126:06
1311.96:116:06
1411.96:106:06
1511.96:106:06
1611.96:096:06
1712.06:096:06
1812.06:086:06
1912.06:076:06
2012.06:076:06
2112.06:066:06
2212.06:056:05
2312.06:056:05
2412.06:046:05
2512.06:036:05
2612.06:036:05
2712.06:026:05
2812.16:016:05
2912.16:016:05
3012.16:006:05

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.56 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 4.35 kWh/m² to a high of 5.56 kWh/m² in September across the year — September's 5.56 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
15.5Bright
25.5Bright
35.5Bright
45.5Bright
55.5Bright
65.5Bright
75.5Bright
85.5Bright
95.5Bright
105.5Bright
115.5Bright
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 Alto Paraíso

In seasonPeak

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

Alto Paraíso'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 September a good time to visit Alto Paraíso?

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

2.8
Sightseeing
6th-best month of the year
5.3
Beach & pool
5th-best month of the year

September is a weaker month for outdoor sightseeing in Alto Paraíso.

What to pack for Alto Paraíso in September

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

In September, Alto Paraíso sees daytime highs around 34°C and nights near 23°C. Pack light clothes and rain gear. Worth having: sun protection. About 16 days see rain.

light clothesrain gearsun protection

UV index in Alto Paraíso in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 3. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Alto Paraíso peaks around March 10 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near September 12 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 11 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highModerateExtremeMar 10UV 15Sep 12UV 3
UV index (midday)Level
Jan15Extreme
Feb15Extreme
Mar15Extreme
Apr13Extreme
May10Extreme
Jun9Very high
Jul9Very high
Aug5High
Sep3Moderate
Oct11Extreme
Nov13Extreme
Dec14Extreme

Air quality in Alto Paraíso 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 Alto Paraíso is worst in September — around 101 µg/m³ PM2.5 (unhealthy), about 10.3× the cleanest month (May, 10 µg/m³).

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

0306090120JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateUnhealthyModerateSep 1496 µg/m³May 1710 µg/m³
PM2.5 (µg/m³)Level
Jan13Moderate
Feb12Moderate
Mar14Moderate
Apr11Good
May10Good
Jun11Good
Jul15Moderate
Aug68Unhealthy
Sep101Unhealthy
Oct41Poor
Nov21Moderate
Dec15Moderate
Location & terrain

Where is Alto Paraíso?

Alto Paraíso sits at 9.7°S, 63.3°W, 137 m above sea level, in Brazil. The nearest listed city is Ariquemes, 36 km away.

Topography around Alto Paraíso

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

Within 3 km, the terrain around Alto Paraíso has only modest variations in elevation — a maximum elevation change of 49 m around an average of 135 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 173 m; within 80 km, significant variations in elevation — a maximum elevation change of 358 m.

The land around Alto Paraíso is covered by grassland (65%) and trees (20%) within 3 km, grassland (60%) and trees (34%) within 16 km, and grassland (52%) and trees (46%) within 80 km.

3 km
49 m
16 km
173 m
80 km
358 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Ariquemes 36 km · Buritis 79 km · Candeias do Jamari 110 km · Jaru 122 km · Porto Velho 125 km · Machadinho d'Oeste 149 km · Ouro Preto do Oeste 165 km · Ji Paraná 197 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 Alto Paraíso (-9.7228°, -63.3102°, elevation 137 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).