Rosário Oeste weather in September

In September, Rosário Oeste sees average daytime highs of 34°C and overnight lows near 22°C, with 42 mm of rain across 7.4 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 34°C through the month. The sky is clear or mostly clear about 52% 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 Rosário Oeste's 4th-clearest and 4th-windiest month. For the whole year in context, see Rosário Oeste's year-round climate.

Daytime high
34°
1st warmest
Overnight low
22°
5th coldest
Rainfall
42 mm
7.4 wet days
Daylight
11 h 54 min
6:42 AM – 6:38 PM
Cloud cover
44%
4th clearest
Wind
7 km/h
4th windiest
Solar energy
5.81 kWh/m²
Travel score
3.4
out of 10

Rosário Oeste is human settlement in Brazil.

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

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 Rosário Oeste reaches about 34°C in the afternoon and slips back to 22°C overnight — a 12°C spread between the day's warmth and the night's chill. On most days the high lands between 29°C and 37°C. Set against its neighbours, September runs about 1°C warmer than August and on par with October.

15°20°25°30°35°40°151015202530
Avg high (°C)Avg low (°C)
13421
23421
33421
43421
53421
63421
73421
83422
93422
103422
113422
123422
133422
143422
153422
163422
173422
183422
193422
203422
213422
223422
233422
243423
253423
263423
273423
283423
293423
303423

How September really feels in Rosário 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.

Rosário 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
Jan31° / 23°24425.612.82.9
Feb31° / 23°22124.612.52.8
Mar31° / 23°20424.812.12.9
Apr31° / 22°9715.711.73.9
May30° / 20°315.311.35.5
Jun30° / 19°91.311.16.1
Jul31° / 18°50.611.26.1
Aug33° / 20°101.511.54.6
Sep34° / 22°427.411.93.4
Oct33° / 23°11716.712.32.9
Nov32° / 23°1702112.72.9
Dec31° / 23°20524.312.92.9

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 52% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 18% of September, with mostly cloudy or overcast conditions the remaining 30%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
18218
28119
38119
48020
57921
67822
77822
87723
97624
107525
117525
127327
137327
147228
157228
167030
177030
186931
196931
206733
216634
226535
236337
246337
256139
266040
275941
285842
295644
305545

Chance of precipitation in September

Any precipitation

Rosário Oeste gets around 42 mm of rain over 7.4 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 25% and peaks near 41% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
111
212
313
413
514
615
715
816
917
1018
1119
1220
1321
1422
1523
1624
1725
1827
1928
2029
2131
2232
2334
2435
2536
2637
2738
2839
2940
3041

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 32% of days. Sticky, muggy-or-worse air turns up on roughly 60% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1102033289
21019322910
31019312911
41019303011
51018303012
61018293013
7917283114
8917283116
9916273217
10815263218
11815253220
12814253321
13713243323
14612243424
15612233426
16511233427
17510223429
1849223431
1949213432
2048203434
2137193436
2237183338
2336173340
2436173242
2525163245
2625153147
2725143149
2824133051
2924133051
3013122955

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 8 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
18calm
28calm
38calm
48calm
58calm
68calm
78calm
88calm
98calm
108calm
118calm
128calm
138calm
148calm
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 6:54 AM to 6:32 AM, and sunset from 6:37 PM to 6:39 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.76:546:37
211.76:536:37
311.76:536:37
411.76:526:37
511.86:516:37
611.86:506:37
711.86:506:37
811.86:496:37
911.86:486:37
1011.86:476:37
1111.86:466:37
1211.96:466:37
1311.96:456:37
1411.96:446:37
1511.96:436:38
1611.96:426:38
1711.96:426:38
1811.96:416:38
1912.06:406:38
2012.06:396:38
2112.06:396:38
2212.06:386:38
2312.06:376:38
2412.06:366:38
2512.06:356:38
2612.16:356:38
2712.16:346:38
2812.16:336:38
2912.16:326:38
3012.16:326:39

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.81 kWh/m².

For context, solar energy here swings from a low near 4.49 kWh/m² to a high of 6 kWh/m² in October across the year — September's 5.81 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
15.7Bright
25.7Bright
35.7Bright
45.7Bright
55.7Bright
65.7Bright
75.7Bright
85.8Bright
95.8Bright
105.8Bright
115.8Bright
125.8Bright
135.8Bright
145.8Bright
155.8Bright
165.8Bright
175.8Bright
185.8Bright
195.8Bright
205.8Bright
215.8Bright
225.8Bright
235.9Bright
245.9Bright
255.9Bright
265.9Bright
275.9Bright
285.9Bright
295.9Bright
305.9Bright
Planning a trip in September

Hazard calendar for Rosário Oeste

In seasonPeak

None of Rosário 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.

Rosário Oeste's monsoon runs October–March, 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 Rosário Oeste?

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

3.4
Sightseeing
6th-best month of the year
6.6
Beach & pool
5th-best month of the year

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

What to pack for Rosário Oeste in September

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

In September, Rosário Oeste sees daytime highs around 34°C and nights near 22°C. Pack light clothes. Worth having: sun protection. About 7 days see rain.

light clothessun protection

UV index in Rosário Oeste in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 5 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Rosário Oeste peaks around January 21 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near September 14 at about 6 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highExtremeJan 21UV 15Sep 14UV 6
UV index (midday)Level
Jan15Extreme
Feb15Extreme
Mar14Extreme
Apr12Extreme
May9Very high
Jun8Very high
Jul8Very high
Aug9Very high
Sep5High
Oct11Extreme
Nov13Extreme
Dec13Extreme

Air quality in Rosário 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 Rosário Oeste is worst in September — around 64 µg/m³ PM2.5 (unhealthy), about 8.8× the cleanest month (May, 7 µg/m³).

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

020406080JanFebMarAprMayJunJulAugSepOctNovDecGoodModeratePoorModerateGoodSep 1559 µg/m³May 217 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb9Good
Mar8Good
Apr8Good
May7Good
Jun7Good
Jul10Good
Aug26Moderate
Sep64Unhealthy
Oct20Moderate
Nov11Good
Dec10Good
Location & terrain

Where is Rosário Oeste?

Rosário Oeste sits at 14.8°S, 56.4°W, 201 m above sea level, in Brazil. The nearest listed city is Nobres, 17 km away.

Topography around Rosário Oeste

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

Within 3 km, the terrain around Rosário Oeste has only modest variations in elevation — a maximum elevation change of 116 m around an average of 198 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 423 m; within 80 km, large variations in elevation — a maximum elevation change of 740 m.

The land around Rosário Oeste is covered by trees (48%) and grassland (37%) within 3 km, trees (43%) and grassland (42%) within 16 km, and trees (44%) and grassland (37%) within 80 km.

3 km
116 m
16 km
423 m
80 km
740 m
treesshrubsgrasslandcroplandartificial surfaceswater
September weather nearby: Nobres 17 km · Diamantino 48 km · Barra do Bugres 85 km · Cuiabá 92 km · Nova Olímpia 93 km · Várzea Grande 96 km · Chapada dos Guimarães 101 km · Tangará da Serra 116 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 Rosário Oeste (-14.8361°, -56.4275°, elevation 201 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).