Castelo weather in May

In May, Castelo sees average daytime highs of 25°C and overnight lows near 16°C, with 43 mm of rain across 8.6 wet days and about 11 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 30% of the time in May, and the air most often feels humid.

Daylight stretches from about 11 h 18 min at the start of May to 10 h 54 min by month's end. Set against the rest of the year, May is Castelo's 5th-clearest and 10th-windiest month. For the whole year in context, see Castelo's year-round climate.

Daytime high
25°
9th warmest
Overnight low
16°
4th coldest
Rainfall
43 mm
8.6 wet days
Daylight
11 hours
7:10 AM – 6:12 PM
Cloud cover
57%
5th clearest
Wind
6 km/h
10th windiest
Solar energy
3.73 kWh/m²
Travel score
7.1
out of 10

Castelo 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 Castelo reaches about 25°C in the afternoon and slips back to 16°C overnight — a 9°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)
12616
22516
32516
42516
52516
62516
72516
82516
92516
102516
112516
122516
132516
142516
152416
162416
172415
182415
192415
202415
212415
222415
232415
242415
252415
262415
272415
282415
292415
302415
312415

Castelo 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° / 20°14814.113.14.9
Feb29° / 20°10711.912.74.8
Mar28° / 19°15916.612.15.0
Apr27° / 18°8813.411.56.0
May25° / 16°438.6117.1
Jun24° / 14°235.510.87.8
Jul24° / 14°24610.97.8
Aug24° / 14°266.511.37.7
Sep26° / 16°589.311.96.9
Oct26° / 17°11012.312.56.1
Nov26° / 18°19117.1135.2
Dec28° / 19°2241913.24.8

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 30% 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 50%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15545
25545
35545
45347
55347
65248
75248
85149
95050
104852
114753
124654
134555
144555
154456
164456
174456
184555
194555
204555
214654
224753
234852
244852
255050
265149
275248
285347
295545
305545
315743

Chance of precipitation in May

Any precipitation

Castelo gets around 43 mm of rain over 8.6 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 29% and peaks near 33% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%151015202531
Rain chance (%)
133
232
332
431
530
629
729
828
928
1028
1128
1228
1328
1429
1529
1629
1729
1830
1930
2030
2130
2230
2329
2429
2528
2628
2727
2826
2926
3025
3124

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 54% of days. Sticky, muggy-or-worse air turns up on roughly 10% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
12205127
22215324
32225422
43235420
53245518
63255517
73265615
83275614
93285613
103295612
113295711
124305610
13430579
14431578
15431578
16432577
17432586
18433576
19533566
20534565
21534565
22535564
23536554
24636544
25637534
26638533
27739513
28740503
29741493
30742483
31843472

Wind in May

Winds average 6 km/h in May.

Across May, daily wind ranges from about 6 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
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm
316calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 11 h 18 min at the start of May to 10 h 54 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 24 minutes over May. Sunrise moves from 7:04 AM to 7:17 AM, and sunset from 6:20 PM to 6:08 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.37:046:20
211.27:056:19
311.27:056:18
411.27:056:18
511.27:066:17
611.27:066:17
711.27:076:16
811.17:076:15
911.17:076:15
1011.17:086:14
1111.17:086:14
1211.17:096:13
1311.17:096:13
1411.17:096:13
1511.07:106:12
1611.07:106:12
1711.07:116:11
1811.07:116:11
1911.07:126:11
2011.07:126:10
2111.07:126:10
2210.97:136:10
2310.97:136:09
2410.97:146:09
2510.97:146:09
2610.97:146:09
2710.97:156:08
2810.97:156:08
2910.97:166:08
3010.97:166:08
3110.97:176:08

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 3.73 kWh/m².

For context, solar energy here swings from a low near 3.53 kWh/m² to a high of 5.96 kWh/m² in February across the year — May's 3.73 kWh/m² sits near the bottom.

012345151015202531
Solar energy (kWh/m²)Level
14.1Bright
24.1Bright
34.1Bright
44.0Bright
54.0Bright
64.0Moderate
74.0Moderate
83.9Moderate
93.9Moderate
103.9Moderate
113.8Moderate
123.8Moderate
133.8Moderate
143.7Moderate
153.7Moderate
163.6Moderate
173.6Moderate
183.6Moderate
193.6Moderate
203.6Moderate
213.6Moderate
223.5Moderate
233.5Moderate
243.5Moderate
253.5Moderate
263.5Moderate
273.5Moderate
283.5Moderate
293.5Moderate
303.6Moderate
313.6Moderate
Planning a trip in May

Hazard calendar for Castelo

In seasonPeak

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

Castelo'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 Castelo?

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

7.1
Sightseeing
4th-best month of the year
6.3
Beach & pool
6th-best month of the year

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

What to pack for Castelo in May

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

In May, Castelo sees daytime highs around 25°C and nights near 16°C. Worth packing: light clothes and rain gear. About 9 days see rain.

light clothesrain gear

Sea temperature near Castelo in May

The nearest coast averages about 25°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 66 km away) is warmest in March at about 25°C and coldest in September near 22°C.

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

20°22°24°26°JanFebMarAprMayJunJulAugSepOctNovDecrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan24Warm
Feb25Warm
Mar25Warm
Apr25Warm
May25Warm
Jun23Refreshing
Jul23Refreshing
Aug23Refreshing
Sep22Refreshing
Oct23Refreshing
Nov24Refreshing
Dec24Warm

UV index in Castelo 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 Castelo peaks around February 11 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 20 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 highExtremeFeb 11UV 14Jun 20UV 6
UV index (midday)Level
Jan14Extreme
Feb15Extreme
Mar13Extreme
Apr10Very high
May7Very high
Jun6High
Jul7High
Aug9Very high
Sep10Very high
Oct12Extreme
Nov13Extreme
Dec14Extreme
Location & terrain

Where is Castelo?

Castelo sits at 20.6°S, 41.2°W, 129 m above sea level, in Brazil. The nearest listed city is Vargem Alta, 20 km away.

Topography around Castelo

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

Within 3 km, the terrain around Castelo has large variations in elevation — a maximum elevation change of 768 m around an average of 224 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,935 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,841 m.

The land around Castelo is covered by trees (56%) and grassland (37%) within 3 km, trees (53%) and grassland (46%) within 16 km, and trees (50%) and grassland (41%) within 80 km.

3 km
768 m
16 km
1,935 m
80 km
2,841 m
treesgrasslandartificial surfaceswaterwetland
May weather nearby: Vargem Alta 20 km · Cachoeiro de Itapemirim 28 km · Muniz Freire 28 km · Alegre 40 km · Iúna 46 km · Ibatiba 53 km · Mimoso do Sul 55 km · Piúma 55 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 Castelo (-20.6036°, -41.1847°, elevation 129 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).