Caicó weather in May

In May, Caicó sees average daytime highs of 33°C and overnight lows near 23°C, with 30 mm of rain across 5.5 wet days and about 11.7 hours of daylight. It is the 9th-warmest and 5th-wettest month of the year here.

Day-to-day highs hold fairly steady near 33°C through the month. The sky is clear or mostly clear about 31% of the time in May, and the air most often feels muggy.

Daylight stretches from about 11 h 48 min at the start of May to 11 h 42 min by month's end. Set against the rest of the year, May is Caicó's 8th-clearest and 8th-windiest month. For the whole year in context, see Caicó's year-round climate.

Daytime high
33°
9th warmest
Overnight low
23°
6th coldest
Rainfall
30 mm
5.5 wet days
Daylight
11 h 42 min
5:33 AM – 5:16 PM
Cloud cover
55%
8th clearest
Wind
14 km/h
8th windiest
Solar energy
5.2 kWh/m²
Travel score
3.6
out of 10

Caicó 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 33°C through the month.

A typical May day in Caicó reaches about 33°C in the afternoon and slips back to 23°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 31°C and 36°C. Set against its neighbours, May runs on par with April and about 1°C warmer than June.

20°25°30°35°40°151015202531
Avg high (°C)Avg low (°C)
13423
23423
33423
43423
53423
63423
73423
83423
93423
103423
113423
123423
133423
143423
153423
163423
173423
183423
193323
203323
213323
223323
233323
243323
253323
263323
273323
283323
293323
303323
313323

How May really feels in Caicó

Once humidity and wind are folded in, May averages 31 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
31
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

The story in May is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Caicó weather by month

How May compares with the rest of the year at a glance. May is the 9th-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan35° / 24°59712.32.6
Feb35° / 24°568.412.22.6
Mar34° / 24°10111.8122.7
Apr34° / 24°6710.311.93.1
May33° / 23°305.511.73.6
Jun32° / 22°193.411.64.4
Jul32° / 21°12211.74.6
Aug33° / 21°50.411.84.3
Sep35° / 22°10.1123.4
Oct36° / 23°40.312.12.7
Nov36° / 23°10.212.32.5
Dec36° / 24°111.912.42.5

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 31% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 25% of May, with mostly cloudy or overcast conditions the remaining 44%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14555
24654
34654
44852
54852
64852
75050
85050
95149
105149
115347
125446
135446
145545
155545
165743
175743
185842
195941
205941
216040
226040
236139
246139
256238
266337
276337
286436
296337
306337
316436

Chance of precipitation in May

Any precipitation

Caicó gets around 30 mm of rain over 5.5 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 18% and peaks near 29% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%151015202531
Rain chance (%)
129
228
327
426
525
623
722
821
920
1019
1118
1217
1316
1416
1516
1615
1715
1815
1915
2015
2115
2215
2315
2415
2515
2615
2715
2815
2914
3014
3114

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 61% of days. Sticky, muggy-or-worse air turns up on roughly 83% of them.

0%25%50%75%100%151015202531
Humid (%)Muggy (%)Oppressive (%)
1115138
2115237
3125236
4125434
5135433
6145432
7145630
8155629
9155728
10155926
11165925
12166024
13166123
14166222
15176122
16176221
17176320
18176320
19176419
20176518
21176518
22176617
23176617
24176716
25186616
26186715
27196714
28206614
29206713
30216712
31226711

Wind in May

Winds average 14 km/h in May.

Across May, daily wind ranges from about 12 km/h on the calmest days to 15 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
112light breeze
212light breeze
313light breeze
413light breeze
513light breeze
613light breeze
713light breeze
813light breeze
913light breeze
1013light breeze
1113light breeze
1213light breeze
1314light breeze
1414light breeze
1514light breeze
1614light breeze
1714light breeze
1814light breeze
1914light breeze
2014light breeze
2114light breeze
2214light breeze
2314light breeze
2414light breeze
2514light breeze
2615light breeze
2715light breeze
2815light breeze
2915light breeze
3015light breeze
3115light breeze

Sunrise & sunset in May

DaylightNight

Daylight runs from about 11 h 48 min at the start of May to 11 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 6 minutes over May. Sunrise moves from 5:32 AM to 5:36 AM, and sunset from 5:19 PM to 5:15 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.85:325:19
211.85:325:19
311.85:325:18
411.85:325:18
511.85:325:18
611.85:325:18
711.75:335:17
811.75:335:17
911.75:335:17
1011.75:335:17
1111.75:335:17
1211.75:335:16
1311.75:335:16
1411.75:335:16
1511.75:335:16
1611.75:335:16
1711.75:345:16
1811.75:345:16
1911.75:345:16
2011.75:345:15
2111.75:345:15
2211.75:345:15
2311.75:355:15
2411.75:355:15
2511.75:355:15
2611.75:355:15
2711.75:355:15
2811.75:355:15
2911.75:365:15
3011.75:365:15
3111.75:365:15

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.2 kWh/m².

For context, solar energy here swings from a low near 4.72 kWh/m² to a high of 7.09 kWh/m² in October across the year — May's 5.2 kWh/m² sits near the bottom.

0246151015202531
Solar energy (kWh/m²)Level
15.4Bright
25.4Bright
35.4Bright
45.4Bright
55.4Bright
65.3Bright
75.3Bright
85.3Bright
95.3Bright
105.3Bright
115.3Bright
125.3Bright
135.3Bright
145.3Bright
155.2Bright
165.2Bright
175.2Bright
185.2Bright
195.2Bright
205.2Bright
215.1Bright
225.1Bright
235.1Bright
245.1Bright
255.1Bright
265.0Bright
275.0Bright
285.0Bright
295.0Bright
305.0Bright
314.9Bright
Planning a trip in May

Is May a good time to visit Caicó?

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

3.6
Sightseeing
4th-best month of the year
6.7
Beach & pool
5th-best month of the year

May is a weaker month for outdoor sightseeing in Caicó. The water and warmth also suit a beach or pool day.

What to pack for Caicó in May

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

In May, Caicó sees daytime highs around 33°C and nights near 23°C. Pack light clothes. Worth having: sun protection. About 6 days see rain.

light clothessun protection

UV index in Caicó in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May peaks around 11 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Caicó peaks around March 13 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 17 at about 10 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highExtremeMar 13UV 15Jul 17UV 10
UV index (midday)Level
Jan13Extreme
Feb15Extreme
Mar15Extreme
Apr14Extreme
May11Extreme
Jun10Very high
Jul10Very high
Aug10Very high
Sep12Extreme
Oct12Extreme
Nov12Extreme
Dec12Extreme

Air quality in Caicó 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 Caicó is worst in October — around 21 µg/m³ PM2.5 (moderate), about 4.0× the cleanest month (July, 5 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateOct 1421 µg/m³Jul 95 µg/m³
PM2.5 (µg/m³)Level
Jan12Moderate
Feb9Good
Mar8Good
Apr8Good
May7Good
Jun6Good
Jul5Good
Aug13Moderate
Sep20Moderate
Oct21Moderate
Nov19Moderate
Dec16Moderate
Location & terrain

Where is Caicó?

Caicó sits at 6.5°S, 37.1°W, 161 m above sea level, in Brazil. The nearest listed city is Jucurutu, 48 km away.

Topography around Caicó

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

Within 3 km, the terrain around Caicó has only modest variations in elevation — a maximum elevation change of 54 m around an average of 162 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 499 m; within 80 km, large variations in elevation — a maximum elevation change of 867 m.

The land around Caicó is covered by shrubs (36%), grassland (31%) and artificial surfaces (27%) within 3 km, shrubs (69%) and grassland (26%) within 16 km, and shrubs (77%) within 80 km.

3 km
54 m
16 km
499 m
80 km
867 m
treesshrubsgrasslandcroplandartificial surfaceswater
May weather nearby: Jucurutu 48 km · Parelhas 55 km · Patos 66 km · Currais Novos 68 km · Catolé do Rocha 73 km · São Bento 75 km · Lagoa Nova 80 km · Picuí 83 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 Caicó (-6.4583°, -37.0978°, elevation 161 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. 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).