Santo Antônio da Patrulha weather in September

In September, Santo Antônio da Patrulha sees average daytime highs of 21°C and overnight lows near 13°C, with 153 mm of rain across 12.1 wet days and about 11.8 hours of daylight. It is the 8th-warmest and 3rd-wettest month of the year here.

Day-to-day highs hold fairly steady near 21°C through the month. The sky is clear or mostly clear about 30% of the time in September, and the air most often feels dry.

Daylight stretches from about 11 h 24 min at the start of September to 12 h 18 min by month's end. Set against the rest of the year, September is Santo Antônio da Patrulha's 11th-clearest and 1st-windiest month. For the whole year in context, see Santo Antônio da Patrulha's year-round climate.

Daytime high
21°
8th warmest
Overnight low
13°
4th coldest
Rainfall
153 mm
12.1 wet days
Daylight
11 h 48 min
7:22 AM – 7:11 PM
Cloud cover
62%
11th clearest
Wind
10 km/h
1st windiest
Solar energy
4.09 kWh/m²
Travel score
6.1
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 21°C through the month.

A typical September day in Santo Antônio da Patrulha reaches about 21°C in the afternoon and slips back to 13°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 16°C and 27°C. Set against its neighbours, September runs about 1°C warmer than August and about 2°C cooler than October.

10°15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12112
22112
32112
42112
52112
62112
72112
82112
92112
102112
112112
122112
132112
142112
152112
162113
172113
182113
192113
202113
212113
222113
232113
242113
252113
262113
272213
282213
292213
302213

Santo Antônio da Patrulha weather by month

How September compares with the rest of the year at a glance. September is the 8th-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan28° / 19°17216.813.75.4
Feb28° / 19°14316.313.15.2
Mar27° / 18°13814.312.26.0
Apr24° / 16°1031111.36.7
May21° / 13°12210.510.56.4
Jun19° / 11°1121010.16.1
Jul19° / 10°14011.110.36.0
Aug21° / 11°12310.710.96.4
Sep21° / 13°15312.111.86.1
Oct23° / 15°18014.412.76.1
Nov25° / 16°12912.613.56.4
Dec27° / 18°1451413.95.9

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 30% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 13% of September, with mostly cloudy or overcast conditions the remaining 57%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14852
24753
34753
44555
54555
64456
74456
84357
94357
104258
114357
124258
134357
144357
154258
164357
174357
184357
194357
204357
214357
224357
234357
244258
254258
264060
274060
284060
293862
303862

Chance of precipitation in September

Any precipitation

Santo Antônio da Patrulha gets around 153 mm of rain over 12.1 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 41% and peaks near 46% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
134
234
335
435
536
636
737
837
938
1038
1138
1239
1339
1440
1541
1641
1742
1842
1943
2043
2144
2244
2344
2444
2545
2645
2745
2846
2946
3046

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 42% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
14730203
24630213
34630213
44530213
54531223
64531223
74431223
84431223
94431223
104431232
114331232
124331242
134231242
144231252
154231252
164131252
174131253
184131253
194131253
204131243
214131244
224131244
234131244
244031245
254031255
263931255
273831256
283831256
293731257
303730267

Wind in September

Winds average 10 km/h in September, the windiest month of the year.

Across September, daily wind ranges from about 10 km/h on the calmest days to 10 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
110calm
210calm
310calm
410calm
510calm
610calm
710calm
810calm
910calm
1010calm
1110calm
1210calm
1310calm
1410calm
1510calm
1610calm
1710calm
1810calm
1910calm
2010calm
2110calm
2210calm
2310calm
2410calm
2510calm
2610calm
2710calm
2810calm
2910calm
3010calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 24 min at the start of September to 12 h 18 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 54 minutes over September. Sunrise moves from 7:41 AM to 7:04 AM, and sunset from 7:03 PM to 7:19 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.47:417:03
211.47:407:03
311.47:387:04
411.57:377:05
511.57:367:05
611.57:357:06
711.57:337:06
811.67:327:07
911.67:317:07
1011.67:297:08
1111.77:287:08
1211.77:277:09
1311.77:267:09
1411.87:247:10
1511.87:237:11
1611.87:227:11
1711.97:207:12
1811.97:197:12
1911.97:187:13
2011.97:177:13
2112.07:157:14
2212.07:147:14
2312.07:137:15
2412.17:117:16
2512.17:107:16
2612.17:097:17
2712.27:087:17
2812.27:067:18
2912.27:057:18
3012.37:047:19

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.09 kWh/m².

For context, solar energy here swings from a low near 2.49 kWh/m² to a high of 6.4 kWh/m² in December across the year — September's 4.09 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
13.8Moderate
23.9Moderate
33.9Moderate
43.9Moderate
53.9Moderate
63.9Moderate
73.9Moderate
83.9Moderate
94.0Moderate
104.0Moderate
114.0Moderate
124.0Bright
134.0Bright
144.0Bright
154.1Bright
164.1Bright
174.1Bright
184.1Bright
194.2Bright
204.2Bright
214.2Bright
224.2Bright
234.3Bright
244.3Bright
254.3Bright
264.3Bright
274.3Bright
284.4Bright
294.4Bright
304.4Bright
Planning a trip in September

Is September a good time to visit Santo Antônio da Patrulha?

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

6.1
Sightseeing
5th-best month of the year
3.9
Beach & pool
8th-best month of the year

September is a reasonable time to visit Santo Antônio da Patrulha for sightseeing.

What to pack for Santo Antônio da Patrulha in September

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

In September, Santo Antônio da Patrulha sees daytime highs around 21°C and nights near 13°C. Worth packing: rain gear. About 12 days see rain.

rain gear

Sea temperature near Santo Antônio da Patrulha in September

The nearest coast averages about 17°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 51 km away) is warmest in February at about 25°C and coldest in August near 16°C.

It's comfortable for a long swim from Nov 9 to May 19 — about 6.3 months when the water holds above 20°C.

15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swimcomfortable to swim
Sea temperature (°C)Comfort
Jan24Warm
Feb25Warm
Mar24Warm
Apr23Refreshing
May20Refreshing
Jun18Cool
Jul16Cool
Aug16Cool
Sep17Cool
Oct19Cool
Nov20Refreshing
Dec23Refreshing

UV index in Santo Antônio da Patrulha in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 8 — 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 da Patrulha peaks around January 17 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 19 at about 3 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highModerateVery highExtremeJan 17UV 13Jun 19UV 3
UV index (midday)Level
Jan13Extreme
Feb12Extreme
Mar10Very high
Apr7Very high
May4Moderate
Jun3Moderate
Jul4Moderate
Aug5Moderate
Sep8Very high
Oct9Very high
Nov11Extreme
Dec12Extreme

Air quality in Santo Antônio da Patrulha 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 da Patrulha is worst in August — around 15 µg/m³ PM2.5 (moderate), about 2.1× the cleanest month (February, 7 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodAug 1815 µg/m³Feb 207 µg/m³
PM2.5 (µg/m³)Level
Jan8Good
Feb7Good
Mar7Good
Apr8Good
May8Good
Jun8Good
Jul11Good
Aug15Moderate
Sep12Good
Oct9Good
Nov8Good
Dec8Good
Location & terrain

Where is Santo Antônio da Patrulha?

Santo Antônio da Patrulha sits at 29.8°S, 50.5°W, 118 m above sea level, in Brazil. The nearest listed city is Rolante, 19 km away.

Topography around Santo Antônio da Patrulha

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

Within 3 km, the terrain around Santo Antônio da Patrulha has only modest variations in elevation — a maximum elevation change of 208 m around an average of 76 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 850 m; within 80 km, large variations in elevation — a maximum elevation change of 1,050 m.

The land around Santo Antônio da Patrulha is covered by grassland (51%), trees (27%) and artificial surfaces (20%) within 3 km, grassland (41%) and trees (39%) within 16 km, and trees (38%), water (24%) and grassland (23%) within 80 km.

3 km
208 m
16 km
850 m
80 km
1,050 m
treesgrasslandcroplandartificial surfaceswaterwetland
September weather nearby: Rolante 19 km · Osório 25 km · Taquara 31 km · Parobé 37 km · Igrejinha 38 km · São Francisco de Paula 42 km · Tramandaí 42 km · Imbé 42 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 da Patrulha (-29.8175°, -50.5197°, elevation 118 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. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. 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).