Casimiro de Abreu weather in May

In May, Casimiro de Abreu sees average daytime highs of 25°C and overnight lows near 17°C, with 79 mm of rain across 12.2 wet days and about 10.9 hours of daylight. It is the 9th-warmest and 9th-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 33% 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 Casimiro de Abreu's 4th-clearest and 9th-windiest month. For the whole year in context, see Casimiro de Abreu's year-round climate.

Daytime high
25°
9th warmest
Overnight low
17°
4th coldest
Rainfall
79 mm
12.2 wet days
Daylight
10 h 54 min
7:17 AM – 6:13 PM
Cloud cover
54%
4th clearest
Wind
7 km/h
9th windiest
Solar energy
3.78 kWh/m²
Travel score
6.6
out of 10

Casimiro de Abreu 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

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

A typical May day in Casimiro de Abreu reaches about 25°C in the afternoon and slips back to 17°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 21°C and 28°C. Set against its neighbours, May runs about 2°C cooler than April and on par with June.

10°15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12618
22618
32618
42618
52617
62517
72517
82517
92517
102517
112517
122517
132517
142517
152517
162517
172517
182517
192517
202517
212417
222416
232416
242416
252416
262416
272416
282416
292416
302416
312416

How May really feels in Casimiro de Abreu

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.

Casimiro de Abreu 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
Jan29° / 21°29121.613.24.0
Feb29° / 21°21016.812.84.2
Mar28° / 21°24021.512.24.3
Apr27° / 19°11914.911.55.8
May25° / 17°7912.210.96.6
Jun24° / 16°437.310.77.6
Jul24° / 15°407.410.87.7
Aug25° / 16°488.211.27.4
Sep25° / 17°10412.911.96.4
Oct26° / 18°1541612.55.6
Nov26° / 19°27521.213.14.7
Dec28° / 21°30822.913.44.2

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 33% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 23% of May, with mostly cloudy or overcast conditions the remaining 43%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16139
26040
36040
45941
55941
65941
75743
85743
95644
105545
115446
125446
135347
145347
155347
165347
175347
185347
195347
205347
215347
225545
235545
245644
255842
265842
275941
286040
296040
306238
316238

Chance of precipitation in May

Any precipitation

Casimiro de Abreu gets around 79 mm of rain over 12.2 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 40% and peaks near 43% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%50%151015202531
Rain chance (%)
141
240
340
440
540
640
740
840
941
1041
1142
1242
1342
1443
1543
1643
1743
1842
1942
2042
2141
2241
2340
2439
2538
2636
2735
2834
2933
3032
3131

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 47% 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 (%)
10839493
21940482
311041462
411142442
511243431
611344411
711444401
811544391
911645381
1011645371
1111745371
1211746361
1311746351
1411846341
1511847330
1611847330
1721948320
1821948310
1921949300
2021949290
2121951280
2232050270
2332051260
2432052250
2532053240
2642151240
2742152230
2842252220
2952252210
3052252210
3152253200

Wind in May

Winds average 7 km/h in May.

Across May, daily wind ranges from about 7 km/h on the calmest days to 7 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm
317calm

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 7:11 AM to 7:24 AM, and sunset from 6:21 PM to 6:08 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.27:116:21
211.27:116:21
311.17:116:20
411.17:126:19
511.17:126:19
611.17:136:18
711.17:136:18
811.17:146:17
911.07:146:16
1011.07:156:16
1111.07:156:15
1211.07:156:15
1311.07:166:14
1411.07:166:14
1510.97:176:13
1610.97:176:13
1710.97:186:12
1810.97:186:12
1910.97:196:12
2010.97:196:11
2110.97:206:11
2210.87:206:10
2310.87:216:10
2410.87:216:10
2510.87:216:10
2610.87:226:09
2710.87:226:09
2810.87:236:09
2910.87:236:09
3010.77:246:08
3110.77:246:08

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 3.78 kWh/m².

For context, solar energy here swings from a low near 3.54 kWh/m² to a high of 6.21 kWh/m² in February across the year — May's 3.78 kWh/m² sits near the bottom.

012345151015202531
Solar energy (kWh/m²)Level
14.2Bright
24.2Bright
34.2Bright
44.1Bright
54.1Bright
64.0Bright
74.0Bright
84.0Moderate
94.0Moderate
103.9Moderate
113.9Moderate
123.8Moderate
133.8Moderate
143.8Moderate
153.7Moderate
163.7Moderate
173.7Moderate
183.7Moderate
193.6Moderate
203.6Moderate
213.6Moderate
223.6Moderate
233.6Moderate
243.6Moderate
253.6Moderate
263.6Moderate
273.5Moderate
283.5Moderate
293.5Moderate
303.5Moderate
313.5Moderate
Planning a trip in May

Hazard calendar for Casimiro de Abreu

In seasonPeak

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

Casimiro de Abreu's rainy season runs October–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 Casimiro de Abreu?

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

6.6
Sightseeing
4th-best month of the year
5.9
Beach & pool
4th-best month of the year

May is a reasonable time to visit Casimiro de Abreu for sightseeing.

What to pack for Casimiro de Abreu in May

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

In May, Casimiro de Abreu sees daytime highs around 25°C and nights near 17°C. Worth packing: light clothes and rain gear. About 12 days see rain.

light clothesrain gear

Sea temperature near Casimiro de Abreu 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 37 km away) is warmest in March at about 25°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
Jan24Refreshing
Feb24Warm
Mar25Warm
Apr25Warm
May24Refreshing
Jun23Refreshing
Jul22Refreshing
Aug22Refreshing
Sep21Refreshing
Oct22Refreshing
Nov22Refreshing
Dec24Refreshing

UV index in Casimiro de Abreu 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 Casimiro de Abreu peaks around January 17 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 11 at about 6 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highHighVery highExtremeJan 17UV 14Jul 11UV 6
UV index (midday)Level
Jan14Extreme
Feb14Extreme
Mar13Extreme
Apr10Very high
May7High
Jun6High
Jul6High
Aug8Very high
Sep7Very high
Oct12Extreme
Nov14Extreme
Dec14Extreme
Location & terrain

Where is Casimiro de Abreu?

Casimiro de Abreu sits at 22.5°S, 42.2°W, 23 m above sea level, in Brazil. The nearest listed city is Silva Jardim, 27 km away.

Topography around Casimiro de Abreu

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

Within 3 km, the terrain around Casimiro de Abreu has significant variations in elevation — a maximum elevation change of 480 m around an average of 71 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,325 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,252 m.

The land around Casimiro de Abreu is covered by trees (51%) and grassland (39%) within 3 km, trees (59%) and grassland (32%) within 16 km, and trees (37%), grassland (31%) and water (30%) within 80 km.

3 km
480 m
16 km
1,325 m
80 km
2,252 m
treesgrasslandcroplandartificial surfaceswaterwetland
May weather nearby: Silva Jardim 27 km · Rio das Ostras 27 km · Iguaba Grande 40 km · Nova Friburgo 40 km · São Pedro da Aldeia 41 km · Bom Jardim 43 km · Buzios 44 km · Macaé 45 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 Casimiro de Abreu (-22.4806°, -42.2042°, elevation 23 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. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).