Rio Bonito weather in August

In August, Rio Bonito sees average daytime highs of 25°C and overnight lows near 18°C, with 44 mm of rain across 7.9 wet days and about 11.2 hours of daylight. It is the 11th-warmest and 11th-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 51% of the time in August, and the air most often feels humid.

Daylight stretches from about 10 h 54 min at the start of August to 11 h 30 min by month's end. Set against the rest of the year, August is Rio Bonito's 2nd-clearest and 3rd-windiest month. For the whole year in context, see Rio Bonito's year-round climate.

Daytime high
25°
11th warmest
Overnight low
18°
2nd coldest
Rainfall
44 mm
7.9 wet days
Daylight
11 h 12 min
7:18 AM – 6:31 PM
Cloud cover
43%
2nd clearest
Wind
9 km/h
3rd windiest
Solar energy
4.33 kWh/m²
Travel score
7.5
out of 10

Rio Bonito is human settlement in Brazil.

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

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 25°C through the month.

A typical August day in Rio Bonito reaches about 25°C in the afternoon and slips back to 18°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 21°C and 29°C. Set against its neighbours, August runs on par with July and on par with September.

15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12518
22518
32518
42518
52518
62518
72518
82518
92518
102518
112518
122518
132518
142518
152518
162518
172518
182518
192518
202518
212518
222518
232518
242518
252518
262518
272518
282518
292518
302618
312618

How August really feels in Rio Bonito

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

August sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Rio Bonito weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 23°23718.713.24.0
Feb30° / 23°17314.912.84.2
Mar29° / 23°21120.112.24.2
Apr28° / 21°11014.311.55.7
May26° / 19°8311.710.96.6
Jun25° / 18°467.210.67.5
Jul25° / 18°447.610.77.6
Aug25° / 18°447.911.27.5
Sep26° / 19°8110.711.96.7
Oct26° / 20°10812.512.56.1
Nov27° / 21°2051813.15.1
Dec29° / 23°24319.813.44.4

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 51% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 15% of August, with mostly cloudy or overcast conditions the remaining 34%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16634
26535
36535
46436
56436
66436
76436
86535
96535
106535
116634
126634
136733
146733
156733
166733
176832
186832
196832
206832
216832
226832
236832
246733
256733
266733
276733
286634
296634
306535
316535

Chance of precipitation in August

Any precipitation

Rio Bonito gets around 44 mm of rain over 7.9 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 26% and peaks near 27% on the wettest days.

0%10%20%30%40%151015202531
Rain chance (%)
124
225
325
425
525
625
725
825
925
1025
1125
1225
1325
1425
1525
1625
1725
1825
1925
2026
2126
2226
2326
2426
2526
2627
2727
2827
2927
3027
3127

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, August lands in the humid band about 49% of days. Sticky, muggy-or-worse air turns up on roughly 33% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
121751300
221751300
321652300
421652300
521652300
621652300
721652300
821651301
921651301
1021750301
1131749301
1231650311
1321650311
1421650311
1521650311
1621650311
1721650311
1821651310
1921650320
2021650330
2121549330
2221549340
2311449350
2411449360
2511348371
2611348371
2711347381
2811347391
2911346391
3011346391
3111346401

Wind in August

Winds average 9 km/h in August.

Across August, daily wind ranges from about 9 km/h on the calmest days to 10 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
119calm
129calm
139calm
1410calm
1510calm
1610calm
1710calm
1810calm
1910calm
2010calm
2110calm
2210calm
2310calm
2410calm
2510calm
2610calm
2710calm
2810calm
2910calm
3010calm
3110calm

Sunrise & sunset in August

DaylightNight

Daylight runs from about 10 h 54 min at the start of August to 11 h 30 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 36 minutes over August. Sunrise moves from 7:28 AM to 7:05 AM, and sunset from 6:25 PM to 6:36 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
110.97:286:25
211.07:286:25
311.07:276:26
411.07:276:26
511.07:266:26
611.07:256:27
711.07:256:27
811.17:246:28
911.17:236:28
1011.17:236:29
1111.17:226:29
1211.17:216:29
1311.27:216:30
1411.27:206:30
1511.27:196:30
1611.27:186:31
1711.27:176:31
1811.27:176:32
1911.37:166:32
2011.37:156:32
2111.37:146:33
2211.37:136:33
2311.37:126:33
2411.47:116:34
2511.47:116:34
2611.47:106:34
2711.47:096:35
2811.57:086:35
2911.57:076:35
3011.57:066:36
3111.57:056:36

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 4.33 kWh/m².

For context, solar energy here swings from a low near 3.47 kWh/m² to a high of 6.16 kWh/m² in February across the year — August's 4.33 kWh/m² falls in the middle.

024151015202531
Solar energy (kWh/m²)Level
13.9Moderate
23.9Moderate
34.0Moderate
44.0Moderate
54.0Bright
64.0Bright
74.1Bright
84.1Bright
94.1Bright
104.1Bright
114.2Bright
124.2Bright
134.2Bright
144.3Bright
154.3Bright
164.3Bright
174.3Bright
184.4Bright
194.4Bright
204.4Bright
214.5Bright
224.5Bright
234.5Bright
244.5Bright
254.6Bright
264.6Bright
274.6Bright
284.7Bright
294.7Bright
304.7Bright
314.7Bright
Planning a trip in August

Hazard calendar for Rio Bonito

In seasonPeak

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

Rio Bonito's rainy season runs November–April, when most of the year's rain falls.

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

Is August a good time to visit Rio Bonito?

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

7.5
Sightseeing
2nd-best month of the year
6.7
Beach & pool
3rd-best month of the year

August is one of the better times to visit Rio Bonito for general sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Rio Bonito in August

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

In August, Rio Bonito sees daytime highs around 25°C and nights near 18°C. Worth packing: light clothes. About 8 days see rain.

light clothes

Sea temperature near Rio Bonito in August

The nearest coast averages about 22°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 46 km away) is warmest in March at about 26°C and coldest in September near 21°C.

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

20°22°24°26°JanFebMarAprMayJunJulAugSepOctNovDeccoolrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan25Warm
Feb25Warm
Mar26Warm
Apr25Warm
May24Refreshing
Jun23Refreshing
Jul22Refreshing
Aug22Refreshing
Sep21Refreshing
Oct22Refreshing
Nov23Refreshing
Dec24Warm

UV index in Rio Bonito in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August 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 Rio Bonito peaks around January 13 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 13 at about 5 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highHighHighVery highExtremeJan 13UV 14Jul 13UV 5
UV index (midday)Level
Jan14Extreme
Feb13Extreme
Mar12Extreme
Apr9Very high
May7High
Jun6High
Jul5Moderate
Aug8Very high
Sep7High
Oct12Extreme
Nov13Extreme
Dec14Extreme

Air quality in Rio Bonito 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 Rio Bonito is worst in September — around 19 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (March, 10 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodSep 1518 µg/m³Mar 1110 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb11Good
Mar10Good
Apr12Good
May15Moderate
Jun16Moderate
Jul15Moderate
Aug15Moderate
Sep19Moderate
Oct13Moderate
Nov11Good
Dec10Good
Location & terrain

Where is Rio Bonito?

Rio Bonito sits at 22.7°S, 42.6°W, 67 m above sea level, in Brazil. The nearest listed city is Tanguá, 11 km away.

Topography around Rio Bonito

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

Within 3 km, the terrain around Rio Bonito has large variations in elevation — a maximum elevation change of 765 m around an average of 161 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 932 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,252 m.

The land around Rio Bonito is covered by trees (64%) and grassland (23%) within 3 km, trees (60%) and grassland (38%) within 16 km, and trees (41%), water (31%) and grassland (22%) within 80 km.

3 km
765 m
16 km
932 m
80 km
2,252 m
treesgrasslandartificial surfaceswaterwetland
August weather nearby: Tanguá 11 km · Silva Jardim 23 km · Saquarema 26 km · Itaboraí 26 km · Cachoeiras de Macacu 28 km · Maricá 32 km · Araruama 33 km · Iguaba Grande 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 Rio Bonito (-22.7086°, -42.6097°, elevation 67 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).