Osório weather in September

In September, Osório sees average daytime highs of 20°C and overnight lows near 14°C, with 138 mm of rain across 11.3 wet days and about 11.8 hours of daylight. It is the 9th-warmest and 2nd-wettest month of the year here.

Day-to-day highs hold fairly steady near 20°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 Osório's 11th-clearest and 3rd-windiest month. For the whole year in context, see Osório's year-round climate.

Daytime high
20°
9th warmest
Overnight low
14°
4th coldest
Rainfall
138 mm
11.3 wet days
Daylight
11 h 48 min
7:21 AM – 7:10 PM
Cloud cover
62%
11th clearest
Wind
16 km/h
3rd windiest
Solar energy
4.15 kWh/m²
Travel score
6.0
out of 10

Osório is Río Grande del Sur.

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 20°C through the month.

A typical September day in Osório reaches about 20°C in the afternoon and slips back to 14°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 16°C and 24°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)
12013
22014
32014
42014
52014
62014
72014
82014
92014
102014
112014
122014
132014
142014
152014
162014
172014
182014
192014
202014
212014
222014
232014
242015
252015
262015
272115
282115
292115
302115

Osório weather by month

How September compares with the rest of the year at a glance. September is the 9th-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan27° / 21°12413.413.76.0
Feb27° / 21°10613.213.15.8
Mar26° / 20°11512.212.26.4
Apr24° / 18°889.411.37.0
May21° / 15°1099.910.56.5
Jun19° / 13°1029.210.16.2
Jul18° / 12°1259.910.36.0
Aug19° / 13°1131010.96.3
Sep20° / 14°13811.311.86.0
Oct22° / 16°15212.612.76.2
Nov24° / 18°10810.813.56.8
Dec26° / 20°11111.513.96.4

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 (%)
14951
24654
34654
44654
54357
64357
74357
84357
94258
104357
114258
124357
134357
144357
154357
164258
174456
184456
194456
204357
214357
224357
234357
244258
254258
264159
273961
283961
293961
303763

Chance of precipitation in September

Any precipitation

Osório gets around 138 mm of rain over 11.3 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 38% and peaks near 40% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
132
233
333
434
534
635
736
836
937
1037
1137
1238
1338
1439
1539
1639
1740
1840
1940
2040
2140
2240
2340
2440
2540
2640
2740
2840
2940
3040

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 35% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
13834262
23734272
33734272
43634272
53634282
63634282
73633292
83633292
93633302
103533302
113532312
123532322
133531322
143531332
153530332
163530332
173529333
183529333
193629323
203629324
213529324
223529314
233529315
243430315
253430315
263330316
273330316
283230317
293229317
303229318

Wind in September

Winds average 16 km/h in September.

Across September, daily wind ranges from about 15 km/h on the calmest days to 17 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
115light breeze
215light breeze
316light breeze
416light breeze
516light breeze
616light breeze
716light breeze
816light breeze
916light breeze
1016light breeze
1116light breeze
1216light breeze
1316light breeze
1416light breeze
1516light breeze
1616light breeze
1716light breeze
1816light breeze
1916light breeze
2016light breeze
2117light breeze
2217light breeze
2317light breeze
2417light breeze
2517light breeze
2617light breeze
2717light breeze
2817light breeze
2917light breeze
3017light breeze

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 7:40 AM to 7:03 AM, and sunset from 7:02 PM to 7:18 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.47:407:02
211.47:397:02
311.47:377:03
411.57:367:03
511.57:357:04
611.57:347:05
711.57:327:05
811.67:317:06
911.67:307:06
1011.67:287:07
1111.77:277:07
1211.77:267:08
1311.77:257:08
1411.87:237:09
1511.87:227:10
1611.87:217:10
1711.97:197:11
1811.97:187:11
1911.97:177:12
2011.97:167:12
2112.07:147:13
2212.07:137:13
2312.07:127:14
2412.17:107:15
2512.17:097:15
2612.17:087:16
2712.27:077:16
2812.27:057:17
2912.27:047:17
3012.37:037:18

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.15 kWh/m².

For context, solar energy here swings from a low near 2.51 kWh/m² to a high of 6.6 kWh/m² in December across the year — September's 4.15 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
13.9Moderate
23.9Moderate
33.9Moderate
43.9Moderate
53.9Moderate
63.9Moderate
74.0Moderate
84.0Moderate
94.0Moderate
104.0Bright
114.0Bright
124.0Bright
134.1Bright
144.1Bright
154.1Bright
164.2Bright
174.2Bright
184.2Bright
194.2Bright
204.3Bright
214.3Bright
224.3Bright
234.3Bright
244.4Bright
254.4Bright
264.4Bright
274.4Bright
284.5Bright
294.5Bright
304.5Bright
Planning a trip in September

Is September a good time to visit Osório?

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

6.0
Sightseeing
9th-best month of the year
3.3
Beach & pool
9th-best month of the year

September is a reasonable time to visit Osório for sightseeing.

What to pack for Osório in September

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

In September, Osório sees daytime highs around 20°C and nights near 14°C. Worth packing: rain gear. About 11 days see rain.

rain gear

Sea temperature near Osório 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 30 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 Osório 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 Osório 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 Osório 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 Osório 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 Osório?

Osório sits at 29.9°S, 50.3°W, 18 m above sea level, in Brazil. The nearest listed city is Imbé, 17 km away.

Topography around Osório

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

Within 3 km, the terrain around Osório has significant variations in elevation — a maximum elevation change of 391 m around an average of 95 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 696 m; within 80 km, large variations in elevation — a maximum elevation change of 1,050 m.

The land around Osório is covered by trees (45%), grassland (25%) and artificial surfaces (24%) within 3 km, trees (36%), grassland (25%) and water (23%) within 16 km, and trees (32%), water (32%) and grassland (22%) within 80 km.

3 km
391 m
16 km
696 m
80 km
1,050 m
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
September weather nearby: Imbé 17 km · Tramandaí 17 km · Xangri-lá 24 km · Santo Antônio da Patrulha 25 km · Capão da Canoa 30 km · Cidreira 33 km · Rolante 40 km · Taquara 56 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 Osório (-29.8867°, -50.2697°, elevation 18 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).