Santo Antônio do Sudoeste weather in September

In September, Santo Antônio do Sudoeste sees average daytime highs of 25°C and overnight lows near 15°C, with 173 mm of rain across 11 wet days and about 11.8 hours of daylight. It is the 8th-warmest and 4th-wettest month of the year here.

Day-to-day highs hold fairly steady near 25°C through the month. The sky is clear or mostly clear about 45% of the time in September, and the air most often feels dry.

Daylight stretches from about 11 h 30 min at the start of September to 12 h 12 min by month's end. Set against the rest of the year, September is Santo Antônio do Sudoeste's 3rd-clearest and 1st-windiest month. For the whole year in context, see Santo Antônio do Sudoeste's year-round climate.

Daytime high
25°
8th warmest
Overnight low
15°
5th coldest
Rainfall
173 mm
11 wet days
Daylight
11 h 48 min
7:34 AM – 7:25 PM
Cloud cover
49%
3rd clearest
Wind
11 km/h
1st windiest
Solar energy
4.78 kWh/m²
Travel score
6.9
out of 10

Santo Antônio do Sudoeste 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 25°C through the month.

A typical September day in Santo Antônio do Sudoeste reaches about 25°C in the afternoon and slips back to 15°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 19°C and 31°C. Set against its neighbours, September runs about 2°C warmer than August and about 2°C cooler than October.

10°20°30°151015202530
Avg high (°C)Avg low (°C)
12514
22514
32514
42514
52514
62514
72514
82514
92514
102514
112514
122515
132515
142515
152515
162515
172515
182515
192515
202515
212515
222515
232515
242515
252515
262515
272515
282515
292515
302515

Santo Antônio do Sudoeste weather by month

How September compares with the rest of the year at a glance. September is the 8th-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan29° / 20°17417.413.44.4
Feb29° / 20°16316.212.94.6
Mar28° / 19°14113.812.25.6
Apr26° / 17°1509.911.46.8
May22° / 13°1739.810.76.8
Jun21° / 12°16910.210.46.5
Jul21° / 11°1358.710.56.9
Aug23° / 13°1107.411.17.6
Sep25° / 15°1731111.86.9
Oct26° / 17°2261412.66.0
Nov28° / 18°16512.913.35.8
Dec29° / 19°19516.613.64.7

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 45% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 12% 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 (%)
16535
26436
36436
46436
56337
66238
76139
86040
96040
106040
115941
125941
135941
145941
155842
165842
175743
185842
195743
205644
215644
225545
235446
245446
255347
265149
275149
284951
294951
304852

Chance of precipitation in September

Any precipitation

Santo Antônio do Sudoeste gets around 173 mm of rain over 11 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 36% and peaks near 43% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
126
226
327
428
529
630
731
832
933
1033
1134
1235
1336
1436
1537
1637
1738
1839
1939
2040
2140
2241
2341
2442
2542
2642
2743
2843
2943
3043

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the dry band about 38% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
14535192
24435192
34435202
44334202
54334212
64334222
74233222
84233232
94133242
104132253
114031253
124031263
134030273
143929284
153929284
163928294
173928295
183927295
193826305
203826306
213826306
223725317
233625327
243525328
253325338
263226339
273126349
2830263510
2929263510
3028263611

Wind in September

Winds average 11 km/h in September, the windiest month of the year.

Across September, daily wind ranges from about 11 km/h on the calmest days to 11 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
111calm
211calm
311calm
411calm
511calm
611calm
711calm
811calm
911calm
1011calm
1111calm
1211calm
1311calm
1411calm
1511calm
1611calm
1711calm
1811calm
1911calm
2011calm
2111calm
2211calm
2311calm
2411calm
2511calm
2611calm
2711calm
2811calm
2911calm
3011calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 30 min at the start of September to 12 h 12 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 42 minutes over September. Sunrise moves from 7:51 AM to 7:18 AM, and sunset from 7:18 PM to 7:31 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.57:517:18
211.57:507:19
311.57:497:19
411.57:477:20
511.67:467:20
611.67:457:21
711.67:447:21
811.67:437:21
911.77:427:22
1011.77:417:22
1111.77:407:23
1211.77:387:23
1311.87:377:23
1411.87:367:24
1511.87:357:24
1611.87:347:25
1711.97:337:25
1811.97:317:26
1911.97:307:26
2012.07:297:26
2112.07:287:27
2212.07:277:27
2312.07:267:28
2412.17:257:28
2512.17:237:28
2612.17:227:29
2712.17:217:29
2812.27:207:30
2912.27:197:30
3012.27:187:31

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.78 kWh/m².

For context, solar energy here swings from a low near 2.85 kWh/m² to a high of 6.27 kWh/m² in December across the year — September's 4.78 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.6Bright
24.6Bright
34.6Bright
44.7Bright
54.7Bright
64.7Bright
74.7Bright
84.7Bright
94.7Bright
104.7Bright
114.7Bright
124.8Bright
134.8Bright
144.8Bright
154.8Bright
164.8Bright
174.8Bright
184.8Bright
194.8Bright
204.8Bright
214.8Bright
224.9Bright
234.9Bright
244.9Bright
254.9Bright
264.9Bright
274.9Bright
284.9Bright
294.9Bright
305.0Bright
Planning a trip in September

Is September a good time to visit Santo Antônio do Sudoeste?

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

6.9
Sightseeing
2nd-best month of the year
6.2
Beach & pool
4th-best month of the year

September is a reasonable time to visit Santo Antônio do Sudoeste for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Santo Antônio do Sudoeste in September

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

In September, Santo Antônio do Sudoeste sees daytime highs around 25°C and nights near 15°C. Worth packing: light clothes, rain gear and sun protection. About 11 days see rain.

light clothesrain gearsun protection

UV index in Santo Antônio do Sudoeste in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Santo Antônio do Sudoeste peaks around January 22 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 10 at about 5 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highHighModerateHighVery highExtremeJan 22UV 15Jul 10UV 5
UV index (midday)Level
Jan15Extreme
Feb15Extreme
Mar12Extreme
Apr9Very high
May6High
Jun5Moderate
Jul5Moderate
Aug6High
Sep7High
Oct10Very high
Nov12Extreme
Dec13Extreme

Air quality in Santo Antônio do Sudoeste 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 Santo Antônio do Sudoeste is worst in September — around 24 µg/m³ PM2.5 (moderate), about 4.1× the cleanest month (March, 6 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodSep 1023 µg/m³Mar 176 µg/m³
PM2.5 (µg/m³)Level
Jan7Good
Feb7Good
Mar6Good
Apr7Good
May6Good
Jun6Good
Jul10Good
Aug22Moderate
Sep24Moderate
Oct12Good
Nov9Good
Dec7Good
Location & terrain

Where is Santo Antônio do Sudoeste?

Santo Antônio do Sudoeste sits at 26.1°S, 53.7°W, 544 m above sea level, in Brazil. The nearest listed city is Dionísio Cerqueira, 22 km away.

Topography around Santo Antônio do Sudoeste

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Santo Antônio do Sudoeste.

Within 3 km, the terrain around Santo Antônio do Sudoeste has only modest variations in elevation — a maximum elevation change of 166 m around an average of 555 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 435 m; within 80 km, large variations in elevation — a maximum elevation change of 810 m.

The land around Santo Antônio do Sudoeste is covered by trees (43%) and cropland (22%) within 3 km, trees (55%) and cropland (30%) within 16 km, and trees (67%) within 80 km.

3 km
166 m
16 km
435 m
80 km
810 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Dionísio Cerqueira 22 km · Ampére 31 km · Realeza 39 km · Capanema 45 km · Salto do Lontra 53 km · Francisco Beltrão 67 km · Marmeleiro 70 km · San Pedro 72 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 Santo Antônio do Sudoeste (-26.0736°, -53.7253°, elevation 544 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).