Belford Roxo weather in May

In May, Belford Roxo sees average daytime highs of 26°C and overnight lows near 18°C, with 58 mm of rain across 9.9 wet days and about 10.9 hours of daylight. It is the 9th-warmest and 9th-wettest month of the year here.

Highs ease over the month, from about 27°C in the first days to 26°C by the end. The sky is clear or mostly clear about 35% of the time in May, and the air most often feels humid.

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 Belford Roxo's 4th-clearest and 10th-windiest month. For the whole year in context, see Belford Roxo's year-round climate.

Daytime high
26°
9th warmest
Overnight low
18°
4th coldest
Rainfall
58 mm
9.9 wet days
Daylight
10 h 54 min
7:23 AM – 6:17 PM
Cloud cover
54%
4th clearest
Wind
5 km/h
10th windiest
Solar energy
3.55 kWh/m²
Travel score
6.7
out of 10

Belford Roxo is main city of Belford Roxo, Rio de Janeiro, 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 26°C by the end.

A typical May day in Belford Roxo reaches about 26°C in the afternoon and slips back to 18°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 22°C and 30°C. Set against its neighbours, May runs about 2°C cooler than April and on par with June.

10°15°20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
12819
22819
32719
42719
52719
62718
72718
82718
92718
102718
112718
122718
132718
142618
152618
162618
172618
182618
192618
202618
212617
222617
232617
242617
252617
262617
272617
282617
292617
302617
312617

How May really feels in Belford Roxo

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.

Belford Roxo weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan31° / 23°23520.113.23.3
Feb32° / 23°16716.412.83.4
Mar30° / 22°17119.512.23.8
Apr29° / 20°8512.111.55.4
May26° / 18°589.910.96.7
Jun26° / 17°345.610.67.5
Jul26° / 16°346.110.77.6
Aug26° / 16°326.511.27.3
Sep27° / 18°669.911.96.5
Oct28° / 20°9612.812.55.5
Nov29° / 21°16517.713.14.5
Dec30° / 22°19219.413.43.8

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 35% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 21% of May, with mostly cloudy or overcast conditions the remaining 44%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16139
26040
36040
46040
55941
65941
75842
85743
95743
105545
115545
125446
135446
145446
155446
165347
175347
185446
195446
205446
215446
225545
235545
245545
255644
265644
275743
285644
295644
305743
315743

Chance of precipitation in May

Any precipitation

Belford Roxo gets around 58 mm of rain over 9.9 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 32% and peaks near 35% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%50%151015202531
Rain chance (%)
134
235
335
435
535
635
735
835
935
1035
1134
1234
1334
1433
1533
1632
1732
1832
1931
2031
2130
2230
2330
2429
2529
2629
2728
2828
2928
3027
3127

Humidity in May

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, May lands in the humid band about 44% of days. Sticky, muggy-or-worse air turns up on roughly 45% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
104325212
205335210
30635509
40636508
50737497
60738487
70839476
80840466
90841455
100942445
110943434
120944434
1301045424
1401045413
1501046413
1601047403
1701147402
1801147392
1901248392
2001248382
2101248372
2211348372
2311348362
2411448352
2511548352
2611548342
2711648331
2811748321
2921748321
3021848311
3121948311

Wind in May

Winds average 5 km/h in May.

Across May, daily wind ranges from about 5 km/h on the calmest days to 6 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
185calm
195calm
205calm
215calm
225calm
235calm
245calm
256calm
266calm
276calm
286calm
296calm
306calm
316calm

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 7:16 AM to 7:29 AM, and sunset from 6:26 PM to 6:13 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.27:166:26
211.27:166:25
311.17:176:24
411.17:176:24
511.17:176:23
611.17:186:23
711.17:186:22
811.07:196:21
911.07:196:21
1011.07:206:20
1111.07:206:20
1211.07:216:19
1311.07:216:19
1410.97:226:18
1510.97:226:18
1610.97:236:17
1710.97:236:17
1810.97:236:16
1910.97:246:16
2010.97:246:15
2110.87:256:15
2210.87:256:15
2310.87:266:14
2410.87:266:14
2510.87:276:14
2610.87:276:14
2710.87:286:13
2810.77:286:13
2910.77:296:13
3010.77:296:13
3110.77:296:13

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 3.55 kWh/m².

For context, solar energy here swings from a low near 3.33 kWh/m² to a high of 5.93 kWh/m² in February across the year — May's 3.55 kWh/m² sits near the bottom.

01234151015202531
Solar energy (kWh/m²)Level
14.0Moderate
23.9Moderate
33.9Moderate
43.9Moderate
53.8Moderate
63.8Moderate
73.8Moderate
83.7Moderate
93.7Moderate
103.7Moderate
113.6Moderate
123.6Moderate
133.6Moderate
143.5Moderate
153.5Moderate
163.5Moderate
173.5Moderate
183.4Moderate
193.4Moderate
203.4Moderate
213.4Moderate
223.4Moderate
233.4Moderate
243.3Moderate
253.3Moderate
263.3Moderate
273.3Moderate
283.3Moderate
293.3Moderate
303.3Moderate
313.3Moderate
Planning a trip in May

Hazard calendar for Belford Roxo

In seasonPeak

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

Belford Roxo's rainy season runs November–March, 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 Belford Roxo?

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

6.7
Sightseeing
4th-best month of the year
6.6
Beach & pool
5th-best month of the year

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

What to pack for Belford Roxo in May

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

In May, Belford Roxo sees daytime highs around 26°C and nights near 18°C. Worth packing: light clothes and rain gear. About 10 days see rain.

light clothesrain gear

Sea temperature near Belford Roxo 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 40 km away) is warmest in March at about 26°C and coldest in August 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
Aug21Refreshing
Sep21Refreshing
Oct22Refreshing
Nov22Refreshing
Dec24Warm

UV index in Belford Roxo in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Belford Roxo 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 highHighExtremeJan 13UV 14Jul 13UV 5
UV index (midday)Level
Jan14Extreme
Feb13Extreme
Mar12Extreme
Apr9Very high
May6High
Jun6High
Jul5Moderate
Aug8Very high
Sep6High
Oct11Extreme
Nov13Extreme
Dec14Extreme

Air quality in Belford Roxo 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 Belford Roxo is worst in July — around 38 µg/m³ PM2.5 (poor), about 2.0× the cleanest month (December, 19 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecModeratePoorModerateModerateJul 1237 µg/m³Dec 2319 µg/m³
PM2.5 (µg/m³)Level
Jan19Moderate
Feb19Moderate
Mar21Moderate
Apr24Moderate
May31Moderate
Jun36Poor
Jul38Poor
Aug32Moderate
Sep37Poor
Oct24Moderate
Nov20Moderate
Dec19Moderate
Location & terrain

Where is Belford Roxo?

Belford Roxo sits at 22.8°S, 43.4°W, 22 m above sea level, in Brazil. The nearest listed city is Nilópolis, 5.0 km away.

Topography around Belford Roxo

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

Within 3 km, the terrain around Belford Roxo has only modest variations in elevation — a maximum elevation change of 61 m around an average of 17 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 956 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,224 m.

The land around Belford Roxo is covered by artificial surfaces (83%) within 3 km, artificial surfaces (46%) and trees (34%) within 16 km, and trees (38%), water (29%) and grassland (25%) within 80 km.

3 km
61 m
16 km
956 m
80 km
2,224 m
treesgrasslandartificial surfaceswaterwetlandmangroves
May weather nearby: Nilópolis 5.0 km · São João de Meriti 5.0 km · Nova Iguaçu 5.0 km · Duque de Caxias 9.0 km · Queimados 17 km · Barra da Tijuca 26 km · Estácio 26 km · Rio de Janeiro 27 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 Belford Roxo (-22.7642°, -43.3994°, elevation 22 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).