Rio Bonito weather in May

In May, Rio Bonito sees average daytime highs of 26°C and overnight lows near 19°C, with 83 mm of rain across 11.7 wet days and about 10.9 hours of daylight. It is the 8th-warmest and 8th-wettest month of the year here.

Highs ease over the month, from about 27°C in the first days to 25°C by the end. The sky is clear or mostly clear about 41% of the time in May, and the air most often feels muggy.

Daylight stretches from about 11 h 12 min at the start of May to 10 h 42 min by month's end. Set against the rest of the year, May is Rio Bonito's 4th-clearest and 9th-windiest month. For the whole year in context, see Rio Bonito's year-round climate.

Daytime high
26°
8th warmest
Overnight low
19°
5th coldest
Rainfall
83 mm
11.7 wet days
Daylight
10 h 54 min
7:19 AM – 6:14 PM
Cloud cover
50%
4th clearest
Wind
8 km/h
9th windiest
Solar energy
3.72 kWh/m²
Travel score
6.6
out of 10

Rio Bonito is human settlement in Brazil.

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

Temperature in May

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 27°C in the first days to 25°C by the end.

A typical May day in Rio Bonito reaches about 26°C in the afternoon and slips back to 19°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 23°C and 29°C. Set against its neighbours, May runs about 2°C cooler than April and on par with June.

15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12720
22720
32720
42720
52620
62620
72620
82620
92620
102620
112620
122620
132619
142619
152619
162619
172619
182519
192519
202519
212519
222519
232519
242519
252519
262519
272519
282519
292519
302519
312519

How May really feels in Rio Bonito

Once humidity and wind are folded in, May 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

May 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 May compares with the rest of the year at a glance. May is the 8th-warmest and 8th-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 May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 41% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 20% of May, with mostly cloudy or overcast conditions the remaining 39%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16535
26535
36436
46436
56436
66436
76238
86238
96040
106040
115842
125842
135842
145743
155743
165743
175743
185842
195842
205842
215842
225941
236040
246139
256238
266238
276436
286436
296436
306436
316535

Chance of precipitation in May

Any precipitation

Rio Bonito gets around 83 mm of rain over 11.7 wet days in May. 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.

0%10%20%30%40%50%151015202531
Rain chance (%)
140
240
340
439
539
639
739
839
939
1040
1140
1240
1340
1440
1539
1639
1739
1839
1939
2038
2138
2237
2337
2437
2536
2636
2735
2835
2934
3033
3133

Humidity in May

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, May lands in the muggy band about 47% of days. Sticky, muggy-or-worse air turns up on roughly 64% of them.

0%25%50%75%100%151015202531
Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
11214334
22224432
32234530
42244528
52254626
62264625
73274624
83284623
93294722
103294721
113304720
124314719
134314718
144324717
154324716
165334715
175334715
185344714
195344813
205344812
216354811
226354811
236354910
24735499
25736498
26736498
27836497
28836497
29836496
30836496
31936496

Wind in May

Winds average 8 km/h in May.

Across May, daily wind ranges from about 8 km/h on the calmest days to 8 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
18calm
28calm
38calm
48calm
58calm
68calm
78calm
88calm
98calm
108calm
118calm
128calm
138calm
148calm
158calm
168calm
178calm
188calm
198calm
208calm
218calm
228calm
238calm
248calm
258calm
268calm
278calm
288calm
298calm
308calm
318calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 11 h 12 min at the start of May to 10 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 30 minutes over May. Sunrise moves from 7:12 AM to 7:26 AM, and sunset from 6:23 PM to 6:09 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.27:126:23
211.27:136:22
311.17:136:21
411.17:146:21
511.17:146:20
611.17:156:19
711.17:156:19
811.07:166:18
911.07:166:18
1011.07:176:17
1111.07:176:17
1211.07:176:16
1311.07:186:15
1410.97:186:15
1510.97:196:15
1610.97:196:14
1710.97:206:14
1810.97:206:13
1910.97:216:13
2010.97:216:12
2110.87:226:12
2210.87:226:12
2310.87:236:11
2410.87:236:11
2510.87:236:11
2610.87:246:11
2710.87:246:10
2810.87:256:10
2910.77:256:10
3010.77:266:10
3110.77:266:09

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 3.72 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 — May's 3.72 kWh/m² sits near the bottom.

012345151015202531
Solar energy (kWh/m²)Level
14.2Bright
24.1Bright
34.1Bright
44.1Bright
54.0Bright
64.0Moderate
74.0Moderate
83.9Moderate
93.9Moderate
103.9Moderate
113.8Moderate
123.8Moderate
133.8Moderate
143.7Moderate
153.7Moderate
163.7Moderate
173.6Moderate
183.6Moderate
193.6Moderate
203.6Moderate
213.5Moderate
223.5Moderate
233.5Moderate
243.5Moderate
253.5Moderate
263.5Moderate
273.5Moderate
283.5Moderate
293.5Moderate
303.5Moderate
313.5Moderate
Planning a trip in May

Hazard calendar for Rio Bonito

In seasonPeak

None of Rio Bonito's seasonal hazards are active in May. 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 May a good time to visit Rio Bonito?

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

6.6
Sightseeing
5th-best month of the year
6.3
Beach & pool
5th-best month of the year

May is a reasonable time to visit Rio Bonito for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Rio Bonito in May

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

In May, Rio Bonito sees daytime highs around 26°C and nights near 19°C. Worth packing: light clothes and rain gear. About 12 days see rain.

light clothesrain gear

Sea temperature near Rio Bonito in May

The nearest coast averages about 24°C in May — 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 May

LowModerateHighVery highExtreme

Clear-sky midday UV in May 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 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 May

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where May 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
May 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).