Alta Floresta d'Oeste weather in September

In September, Alta Floresta d'Oeste sees average daytime highs of 32°C and overnight lows near 21°C, with 81 mm of rain across 12.8 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 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 Alta Floresta d'Oeste's 4th-clearest and 4th-windiest month. For the whole year in context, see Alta Floresta d'Oeste's year-round climate.

Daytime high
32°
1st warmest
Overnight low
21°
6th coldest
Rainfall
81 mm
12.8 wet days
Daylight
11 h 54 min
6:04 AM – 6:00 PM
Cloud cover
55%
4th clearest
Wind
6 km/h
4th windiest
Solar energy
5.68 kWh/m²
Travel score
3.7
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 Alta Floresta d'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 29°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°151015202530
Avg high (°C)Avg low (°C)
13221
23221
33221
43221
53221
63221
73221
83221
93221
103221
113221
123221
133221
143221
153222
163222
173222
183222
193222
203222
213222
223222
233222
243222
253222
263222
273222
283222
293222
303222

How September really feels in Alta Floresta d'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.

Alta Floresta d'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°30028.712.63.0
Feb29° / 22°28826.312.43.0
Mar29° / 22°28028.512.13.1
Apr29° / 21°15021.911.73.8
May29° / 20°6913.311.55.1
Jun30° / 20°183.811.36.2
Jul31° / 19°122.611.45.9
Aug32° / 20°274.911.64.8
Sep32° / 21°8112.811.93.7
Oct31° / 22°16321.612.33.2
Nov30° / 22°2332512.63.1
Dec29° / 22°27327.612.73.1

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 24% of September, with mostly cloudy or overcast conditions the remaining 40%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
17624
27426
37327
47327
57129
67030
76931
86832
96733
106634
116436
126436
136337
146139
156040
165842
175743
185644
195545
205446
215347
225248
235248
245050
255050
264852
274753
284753
294654
304456

Chance of precipitation in September

Any precipitation

Alta Floresta d'Oeste gets around 81 mm of rain over 12.8 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 43% and peaks near 59% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
127
228
329
430
531
632
733
834
935
1036
1137
1238
1340
1441
1542
1644
1745
1846
1947
2048
2150
2251
2352
2453
2554
2655
2756
2857
2958
3059

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 43% 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 (%)
1512204320
2411204421
3410204422
4410204423
539194425
639194326
738184328
838184329
927174331
1027174232
1126164234
1226154136
1325154137
1425144039
1524133941
1624123844
1724113746
1823113648
1923103550
202393452
212383354
222383255
232273257
241273159
251263061
261262962
271252864
281252765
291242766
301242667

Wind in September

Winds average 6 km/h in September.

Across September, daily wind ranges from about 6 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
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm

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 6:15 AM to 5:54 AM, and sunset from 6:01 PM to 6:00 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.86:156:01
211.86:146:01
311.86:136:01
411.86:136:00
511.86:126:00
611.86:116:00
711.86:106:00
811.86:106:00
911.96:096:00
1011.96:086:00
1111.96:086:00
1211.96:076:00
1311.96:066:00
1411.96:066:00
1511.96:056:00
1611.96:046:00
1711.96:036:00
1812.06:036:00
1912.06:026:00
2012.06:016:00
2112.06:016:00
2212.06:006:00
2312.05:596:00
2412.05:586:00
2512.05:586:00
2612.05:576:00
2712.15:566:00
2812.15:566:00
2912.15:556:00
3012.15:546:00

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.68 kWh/m².

For context, solar energy here swings from a low near 4.48 kWh/m² to a high of 5.76 kWh/m² in October across the year — September's 5.68 kWh/m² sits near the top of that range.

0246151015202530
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
115.7Bright
125.7Bright
135.7Bright
145.7Bright
155.7Bright
165.7Bright
175.7Bright
185.7Bright
195.7Bright
205.7Bright
215.7Bright
225.7Bright
235.8Bright
245.8Bright
255.8Bright
265.8Bright
275.8Bright
285.8Bright
295.8Bright
305.8Bright
Planning a trip in September

Hazard calendar for Alta Floresta d'Oeste

In seasonPeak

None of Alta Floresta d'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.

Alta Floresta d'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 Alta Floresta d'Oeste?

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

3.7
Sightseeing
6th-best month of the year
6.0
Beach & pool
5th-best month of the year

September is a weaker month for outdoor sightseeing in Alta Floresta d'Oeste. The water and warmth also suit a beach or pool day.

What to pack for Alta Floresta d'Oeste in September

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

In September, Alta Floresta d'Oeste sees daytime highs around 32°C and nights near 21°C. Pack light clothes. Worth having: rain gear and sun protection. About 13 days see rain.

light clothesrain gearsun protection

UV index in Alta Floresta d'Oeste in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 3 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Alta Floresta d'Oeste peaks around January 23 at about 16 (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 — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highModerateExtremeJan 23UV 16Sep 15UV 4
UV index (midday)Level
Jan16Extreme
Feb15Extreme
Mar15Extreme
Apr13Extreme
May10Very high
Jun9Very high
Jul8Very high
Aug9Very high
Sep3Moderate
Oct11Extreme
Nov14Extreme
Dec14Extreme

Air quality in Alta Floresta d'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 Alta Floresta d'Oeste is worst in September — around 53 µg/m³ PM2.5 (poor), about 6.9× the cleanest month (June, 8 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecGoodModeratePoorModerateSep 1450 µg/m³Jun 178 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb12Good
Mar12Good
Apr9Good
May8Good
Jun8Good
Jul8Good
Aug34Moderate
Sep53Poor
Oct23Moderate
Nov15Moderate
Dec13Moderate
Location & terrain

Where is Alta Floresta d'Oeste?

Alta Floresta d'Oeste sits at 12.0°S, 62.0°W, 350 m above sea level, in Brazil. The nearest listed city is Rolim de Moura, 25 km away.

Topography around Alta Floresta d'Oeste

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Alta Floresta d'Oeste.

Within 3 km, the terrain around Alta Floresta d'Oeste has only modest variations in elevation — a maximum elevation change of 160 m around an average of 368 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 249 m; within 80 km, significant variations in elevation — a maximum elevation change of 396 m.

The land around Alta Floresta d'Oeste is covered by grassland (71%) and trees (26%) within 3 km, grassland (72%) and trees (26%) within 16 km, and grassland (55%) and trees (43%) within 80 km.

3 km
160 m
16 km
249 m
80 km
396 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Rolim de Moura 25 km · Cacoal 81 km · São Miguel do Guaporé 88 km · Presidente Médici 88 km · Pimenta Bueno 89 km · Espigão dOeste 114 km · Ji Paraná 120 km · Rolim de Moura do Guaporé 129 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 Alta Floresta d'Oeste (-11.9681°, -61.9542°, elevation 350 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).