Rosário weather in August

In August, Rosário sees average daytime highs of 33°C and overnight lows near 24°C, with 16 mm of rain across 4.3 wet days and about 11.9 hours of daylight. It is the 5th-warmest and 11th-wettest month of the year here.

Day-to-day highs hold fairly steady near 33°C through the month. The sky is clear or mostly clear about 62% of the time in August, and the air most often feels oppressive.

Daylight stretches from about 11 h 54 min at the start of August to 11 h 54 min by month's end. Set against the rest of the year, August is Rosário's 1st-clearest and 5th-windiest month. For the whole year in context, see Rosário's year-round climate.

Daytime high
33°
5th warmest
Overnight low
24°
7th coldest
Rainfall
16 mm
4.3 wet days
Daylight
11 h 54 min
6:04 AM – 5:58 PM
Cloud cover
39%
1st clearest
Wind
10 km/h
5th windiest
Solar energy
5.81 kWh/m²
Travel score
4.2
out of 10

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 33°C through the month.

A typical August day in Rosário reaches about 33°C in the afternoon and slips back to 24°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 31°C and 34°C. Set against its neighbours, August runs about 2°C warmer than July and about 1°C cooler than September.

20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
13224
23224
33224
43224
53224
63224
73224
83324
93324
103324
113324
123324
133324
143324
153324
163324
173324
183324
193324
203324
213324
223324
233324
243324
253324
263324
273324
283324
293424
303424
313424

How August really feels in Rosário

Once humidity and wind are folded in, August averages 31 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
31
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

The story in August is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Rosário weather by month

How August compares with the rest of the year at a glance. August is the 5th-warmest and 11th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan32° / 24°26225.412.22.6
Feb31° / 24°33025.612.12.5
Mar31° / 24°43730122.4
Apr31° / 24°42628.411.92.5
May31° / 24°25524.111.93.0
Jun31° / 24°9615.711.83.9
Jul31° / 23°579.711.84.5
Aug33° / 24°164.311.94.2
Sep34° / 25°102.6123.6
Oct34° / 25°214.812.13.4
Nov34° / 25°437.112.13.3
Dec33° / 25°9815.412.23.0

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 62% of the time in August, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 27% of August, with mostly cloudy or overcast conditions the remaining 11%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
19010
29010
39010
49010
59010
69010
79010
88911
98911
108911
118911
128812
138812
148812
158812
168812
178812
188812
198812
208812
219010
229010
239010
249010
259010
26919
27919
28919
29919
30919
31919

Chance of precipitation in August

Any precipitation

Rosário gets around 16 mm of rain over 4.3 wet days in August. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 13% and peaks near 16% on the wettest days.

0%10%20%30%151015202531
Rain chance (%)
116
216
315
415
515
615
714
814
914
1014
1114
1213
1313
1413
1512
1612
1712
1812
1912
2012
2112
2212
2312
2412
2512
2611
2711
2811
2910
3010
3110

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, August lands in the oppressive band about 90% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Humid (%)Muggy (%)Oppressive (%)Miserable (%)
106913
206913
306922
406922
506922
606922
706922
806922
906922
1006922
1106922
1216912
1317902
1417902
1517902
1617902
1718892
1818892
1918892
2018892
2118892
2218892
2309892
2409892
2509892
2609892
2709892
28010882
29010882
30010891
31011881

Wind in August

Winds average 10 km/h in August.

Across August, daily wind ranges from about 9 km/h on the calmest days to 11 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
19calm
29calm
39calm
49calm
59calm
69calm
79calm
89calm
99calm
109calm
1110calm
1210calm
1310calm
1410calm
1510calm
1610calm
1710calm
1810calm
1910calm
2010calm
2110calm
2210calm
2310calm
2410calm
2511calm
2611calm
2711calm
2811calm
2911calm
3011calm
3111calm

Sunrise & sunset in August

DaylightNight

Daylight runs from about 11 h 54 min at the start of August to 11 h 54 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 0 minutes over August. Sunrise moves from 6:07 AM to 5:59 AM, and sunset from 5:59 PM to 5:55 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.96:075:59
211.96:075:59
311.96:075:59
411.96:075:59
511.96:065:59
611.96:065:59
711.96:065:59
811.96:065:59
911.96:065:59
1011.96:055:59
1111.96:055:59
1211.96:055:59
1311.96:055:59
1411.96:055:58
1511.96:045:58
1611.96:045:58
1711.96:045:58
1811.96:035:58
1911.96:035:58
2011.96:035:58
2111.96:025:57
2211.96:025:57
2311.96:025:57
2411.96:015:57
2511.96:015:57
2611.96:015:56
2711.96:005:56
2811.96:005:56
2911.96:005:56
3011.95:595:56
3111.95:595:55

Solar energy in August

Daily solar energy (kWh/m²)

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

For context, solar energy here swings from a low near 4.38 kWh/m² to a high of 6.27 kWh/m² in October across the year — August's 5.81 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.5Bright
25.6Bright
35.6Bright
45.6Bright
55.6Bright
65.7Bright
75.7Bright
85.7Bright
95.7Bright
105.7Bright
115.7Bright
125.8Bright
135.8Bright
145.8Bright
155.8Bright
165.8Bright
175.8Bright
185.8Bright
195.9Bright
205.9Bright
215.9Bright
225.9Bright
235.9Bright
245.9Bright
256.0Bright
266.0Bright
276.0Bright
286.0Bright
296.0Intense
306.0Intense
316.0Intense
Planning a trip in August

Hazard calendar for Rosário

In seasonPeak

None of Rosário's seasonal hazards are active in August. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Rosário's monsoon runs January–May, when most of the year's rain falls.

Monsoon
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is August a good time to visit Rosário?

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

4.2
Sightseeing
2nd-best month of the year
7.4
Beach & pool
1st-best month of the year

August is a reasonable time to visit Rosário for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Rosário in August

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

In August, Rosário sees daytime highs around 33°C and nights near 24°C. Pack light clothes. Worth having: sun protection. About 4 days see rain.

light clothessun protection

Sea temperature near Rosário in August

The nearest coast averages about 28°C in August — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 38 km away) is warmest in May at about 29°C and coldest in October near 28°C.

The water stays above 20°C all year — warm enough for a swim any month.

26°28°30°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan28Tropical
Feb28Tropical
Mar28Tropical
Apr29Tropical
May29Tropical
Jun29Tropical
Jul28Tropical
Aug28Tropical
Sep28Warm
Oct28Warm
Nov28Warm
Dec28Warm

UV index in Rosário in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 10 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Rosário peaks around March 18 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 17 at about 10 (extreme).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeMar 18UV 15Jul 17UV 10
UV index (midday)Level
Jan13Extreme
Feb14Extreme
Mar16Extreme
Apr14Extreme
May11Extreme
Jun10Extreme
Jul10Very high
Aug10Extreme
Sep12Extreme
Oct12Extreme
Nov11Extreme
Dec11Extreme

Air quality in Rosário in August

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where August falls, not just the annual average.

Air quality in Rosário is worst in February — around 17 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (June, 9 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateFeb 2017 µg/m³Jun 149 µg/m³
PM2.5 (µg/m³)Level
Jan15Moderate
Feb17Moderate
Mar17Moderate
Apr14Moderate
May10Good
Jun9Good
Jul11Good
Aug10Good
Sep10Good
Oct12Moderate
Nov14Moderate
Dec14Moderate
Location & terrain

Where is Rosário?

Rosário sits at 2.9°S, 44.2°W, 1 m above sea level, in Brazil. The nearest listed city is Bacabeira, 8.0 km away.

Topography around Rosário

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

Within 3 km, the terrain around Rosário has only modest variations in elevation — a maximum elevation change of 43 m around an average of 14 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 97 m; within 80 km, only modest variations in elevation — a maximum elevation change of 124 m.

The land around Rosário is covered by trees (57%) and grassland (25%) within 3 km, trees (58%) within 16 km, and trees (44%) within 80 km.

3 km
43 m
16 km
97 m
80 km
124 m
treesshrubsgrasslandartificial surfaceswaterwetlandmangroves
August weather nearby: Bacabeira 8.0 km · Santa Rita 24 km · Morros 25 km · Icatu 27 km · São Luís 46 km · São José de Ribamar 48 km · Paço do Lumiar 48 km · Itapecuru Mirim 52 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 (-2.9405°, -44.249°, elevation 1 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).