Colorado do Oeste weather in September

In September, Colorado do Oeste sees average daytime highs of 32°C and overnight lows near 21°C, with 67 mm of rain across 11.7 wet days and about 11.9 hours of daylight. It is the 1st-warmest and 8th-wettest month of the year here.

Day-to-day highs hold fairly steady near 32°C through the month. The sky is clear or mostly clear about 40% of the time in September, and the air most often feels muggy.

Daylight stretches from about 11 h 42 min at the start of September to 12 h 06 min by month's end. Set against the rest of the year, September is Colorado do Oeste's 4th-clearest and 3rd-windiest month. For the whole year in context, see Colorado do Oeste's year-round climate.

Daytime high
32°
1st warmest
Overnight low
21°
6th coldest
Rainfall
67 mm
11.7 wet days
Daylight
11 h 54 min
5:59 AM – 5:54 PM
Cloud cover
52%
4th clearest
Wind
7 km/h
3rd windiest
Solar energy
5.7 kWh/m²
Travel score
3.9
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 32°C through the month.

A typical September day in Colorado do Oeste reaches about 32°C in the afternoon and slips back to 21°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 28°C and 35°C. Set against its neighbours, September runs on par with August and about 1°C warmer than October.

15°20°25°30°35°40°151015202530
Avg high (°C)Avg low (°C)
13221
23221
33221
43221
53221
63221
73221
83221
93221
103221
113221
123221
133221
143221
153221
163221
173221
183221
193221
203221
213222
223222
233222
243222
253222
263222
273222
283222
293222
303222

How September really feels in Colorado do Oeste

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.

Colorado do Oeste weather by month

How September compares with the rest of the year at a glance. September is the 1st-warmest and 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan29° / 22°25528.612.73.1
Feb29° / 22°24825.712.43.1
Mar29° / 22°21927.712.13.1
Apr29° / 21°11620.411.73.9
May29° / 20°5611.411.45.4
Jun29° / 19°132.711.26.4
Jul30° / 18°101.711.36.2
Aug32° / 19°213.811.65.0
Sep32° / 21°6711.711.93.9
Oct31° / 22°13619.812.33.4
Nov30° / 22°18823.612.63.2
Dec29° / 22°23326.812.83.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 40% 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 38%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
17822
27822
37624
47525
57327
67327
77129
87129
97030
106832
116832
126634
136535
146436
156337
166238
176139
186040
195941
205842
215644
225644
235446
245347
255248
265149
275050
285050
294852
304753

Chance of precipitation in September

Any precipitation

Colorado do Oeste gets around 67 mm of rain over 11.7 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 39% and peaks near 56% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
122
223
324
425
526
627
728
829
930
1031
1132
1233
1334
1436
1537
1639
1740
1841
1943
2044
2146
2247
2349
2450
2551
2653
2754
2854
2955
3056

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the muggy band about 42% of days. Sticky, muggy-or-worse air turns up on roughly 78% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1514234513
2513224614
3513214715
4512204716
5412194816
6412194818
7411184919
8411174920
9310164921
10310164923
1139154825
1239144827
1338134829
1437134731
1527124633
1626114535
1725114437
1825114339
1924104242
2024104144
212493946
222393848
232383651
242383552
252283454
262273356
271273258
281263160
291263061
301262962

Wind in September

Winds average 7 km/h in September.

Across September, daily wind ranges from about 7 km/h on the calmest days to 7 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 42 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 24 minutes over September. Sunrise moves from 6:10 AM to 5:48 AM, and sunset from 5:54 PM to 5:55 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.76:105:54
211.86:095:54
311.86:085:54
411.86:075:54
511.86:075:54
611.86:065:54
711.86:055:54
811.86:055:54
911.86:045:54
1011.96:035:54
1111.96:025:54
1211.96:025:54
1311.96:015:54
1411.96:005:54
1511.95:595:54
1611.95:595:54
1711.95:585:54
1812.05:575:54
1912.05:565:54
2012.05:565:54
2112.05:555:54
2212.05:545:54
2312.05:535:54
2412.05:535:54
2512.05:525:54
2612.15:515:54
2712.15:515:54
2812.15:505:54
2912.15:495:55
3012.15:485:55

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.7 kWh/m².

For context, solar energy here swings from a low near 4.51 kWh/m² to a high of 5.8 kWh/m² in October across the year — September's 5.7 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
15.5Bright
25.5Bright
35.6Bright
45.6Bright
55.6Bright
65.6Bright
75.6Bright
85.6Bright
95.6Bright
105.6Bright
115.7Bright
125.7Bright
135.7Bright
145.7Bright
155.7Bright
165.7Bright
175.7Bright
185.7Bright
195.8Bright
205.8Bright
215.8Bright
225.8Bright
235.8Bright
245.8Bright
255.8Bright
265.8Bright
275.8Bright
285.8Bright
295.8Bright
305.8Bright
Planning a trip in September

Hazard calendar for Colorado do Oeste

In seasonPeak

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

Colorado do Oeste'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 Colorado do Oeste?

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

3.9
Sightseeing
5th-best month of the year
6.3
Beach & pool
5th-best month of the year

September is a weaker month for outdoor sightseeing in Colorado do Oeste. The water and warmth also suit a beach or pool day.

What to pack for Colorado do Oeste in September

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

In September, Colorado do Oeste sees daytime highs around 32°C and nights near 21°C. Pack light clothes. Worth having: rain gear and sun protection. About 12 days see rain.

light clothesrain gearsun protection

UV index in Colorado do Oeste 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 Colorado do Oeste peaks around January 21 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near September 15 at about 4 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highModerateExtremeJan 21UV 15Sep 15UV 4
UV index (midday)Level
Jan15Extreme
Feb15Extreme
Mar14Extreme
Apr13Extreme
May10Very high
Jun9Very high
Jul8Very high
Aug9Very high
Sep3Moderate
Oct12Extreme
Nov13Extreme
Dec14Extreme

Air quality in Colorado do Oeste 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 Colorado do Oeste is worst in September — around 66 µg/m³ PM2.5 (unhealthy), about 8.1× the cleanest month (May, 8 µg/m³).

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

020406080JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateModerateSep 1562 µg/m³May 168 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb11Good
Mar11Good
Apr9Good
May8Good
Jun9Good
Jul10Good
Aug39Poor
Sep66Unhealthy
Oct27Moderate
Nov17Moderate
Dec12Moderate
Location & terrain

Where is Colorado do Oeste?

Colorado do Oeste sits at 13.1°S, 60.5°W, 433 m above sea level, in Brazil. The nearest listed city is Cerejeiras, 30 km away.

Topography around Colorado do Oeste

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

Within 3 km, the terrain around Colorado do Oeste has only modest variations in elevation — a maximum elevation change of 122 m around an average of 428 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 337 m; within 80 km, significant variations in elevation — a maximum elevation change of 488 m.

The land around Colorado do Oeste is covered by grassland (61%) and trees (25%) within 3 km, grassland (66%) and trees (33%) within 16 km, and trees (57%) and grassland (30%) within 80 km.

3 km
122 m
16 km
337 m
80 km
488 m
treesshrubsgrasslandcroplandartificial surfaces
September weather nearby: Cerejeiras 30 km · Vilhena 60 km · Comodoro 102 km · Pimenta Bueno 176 km · Espigão dOeste 184 km · Rolim de Moura do Guaporé 188 km · Sapezal 192 km · Alta Floresta d'Oeste 200 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 Colorado do Oeste (-13.1167°, -60.5417°, elevation 433 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).