Castelo do Piauí weather in October

In October, Castelo do Piauí sees average daytime highs of 37°C and overnight lows near 25°C, with 14 mm of rain across 0.8 wet days and about 12.1 hours of daylight. It is the 1st-warmest and 7th-wettest month of the year here.

Day-to-day highs hold fairly steady near 37°C through the month. The sky is clear or mostly clear about 65% of the time in October, and the air most often feels humid.

Daylight stretches from about 12 hours at the start of October to 12 h 12 min by month's end. Set against the rest of the year, October is Castelo do Piauí's 3rd-clearest and 2nd-windiest month. For the whole year in context, see Castelo do Piauí's year-round climate.

Daytime high
37°
1st warmest
Overnight low
25°
10th coldest
Rainfall
14 mm
0.8 wet days
Daylight
12 h 06 min
5:28 AM – 5:35 PM
Cloud cover
37%
3rd clearest
Wind
15 km/h
2nd windiest
Solar energy
6.94 kWh/m²
Travel score
2.0
out of 10

Temperature in October

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 37°C through the month.

A typical October day in Castelo do Piauí reaches about 37°C in the afternoon and slips back to 25°C overnight — a 12°C spread between the day's warmth and the night's chill. On most days the high lands between 35°C and 38°C. Set against its neighbours, October runs on par with September and on par with November.

20°25°30°35°40°151015202531
Avg high (°C)Avg low (°C)
13725
23725
33725
43725
53725
63725
73725
83725
93725
103725
113725
123725
133725
143725
153725
163725
173725
183725
193725
203725
213725
223725
233725
243725
253725
263725
273725
283725
293725
303725
313725

How October really feels in Castelo do Piauí

Once humidity and wind are folded in, October 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 October is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Castelo do Piauí weather by month

How October compares with the rest of the year at a glance. October is the 1st-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan33° / 24°15616.512.32.8
Feb32° / 23°17917.112.22.9
Mar32° / 23°25721.8122.9
Apr32° / 23°18418.311.93.3
May32° / 23°768.811.83.9
Jun33° / 23°11211.74.2
Jul34° / 23°61.111.74.0
Aug35° / 24°10.111.83.3
Sep36° / 24°10.3122.5
Oct37° / 25°140.812.12.0
Nov37° / 25°142.612.22.1
Dec36° / 25°416.712.32.4

Cloud cover in October

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 65% of the time in October.

Beyond those clear spells, partly cloudy skies cover about 18% of October, with mostly cloudy or overcast conditions the remaining 17%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
19010
29010
38911
48812
58812
68812
78614
88614
98614
108515
118515
128515
138515
148416
158515
168515
178515
188416
198416
208317
218317
228218
238020
247921
257822
267723
277525
287525
297327
307327
317129

Chance of precipitation in October

Any precipitation

Castelo do Piauí gets around 14 mm of rain over 0.8 wet days in October. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 3% and peaks near 6% on the wettest days.

0%10%20%30%151015202531
Rain chance (%)
11
21
31
41
51
61
71
81
92
102
112
122
132
143
153
163
173
183
194
204
214
224
234
245
255
265
275
286
296
306
316

Humidity in October

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, October lands in the humid band about 55% of days. Sticky, muggy-or-worse air turns up on roughly 10% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
11415440
21415440
31415440
41415440
51415440
61405540
71405450
81405450
91395451
101385461
111385461
121375561
131375471
141365472
151355482
161355392
171345492
1813254103
1913254103
2013155103
2113055113
2212956113
2312857113
2412757123
2512658123
2612657124
2712558124
2812557134
2912557134
3012458134
3112459133

Wind in October

Winds average 15 km/h in October.

Across October, daily wind ranges from about 14 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
115light breeze
215light breeze
315light breeze
415light breeze
515light breeze
615light breeze
715light breeze
815light breeze
915light breeze
1015light breeze
1115light breeze
1215light breeze
1315light breeze
1415light breeze
1515light breeze
1615light breeze
1715light breeze
1815light breeze
1915light breeze
2015light breeze
2114light breeze
2214light breeze
2314light breeze
2414light breeze
2514light breeze
2614light breeze
2714light breeze
2814light breeze
2914light breeze
3014light breeze
3114light breeze

Sunrise & sunset in October

DaylightNight

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

Days grow by about 12 minutes over October. Sunrise moves from 5:34 AM to 5:24 AM, and sunset from 5:37 PM to 5:35 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.05:345:37
212.15:335:36
312.15:335:36
412.15:325:36
512.15:325:36
612.15:325:36
712.15:315:36
812.15:315:36
912.15:305:35
1012.15:305:35
1112.15:295:35
1212.15:295:35
1312.15:295:35
1412.15:285:35
1512.15:285:35
1612.15:285:35
1712.15:275:35
1812.15:275:35
1912.15:275:35
2012.15:265:35
2112.15:265:35
2212.15:265:35
2312.25:265:35
2412.25:255:35
2512.25:255:35
2612.25:255:35
2712.25:255:35
2812.25:255:35
2912.25:245:35
3012.25:245:35
3112.25:245:35

Solar energy in October

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in October, about 6.94 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 4.99 kWh/m² to a high of 6.94 kWh/m² in October across the year — October's 6.94 kWh/m² sits near the top of that range.

02468151015202531
Solar energy (kWh/m²)Level
17.0Intense
27.0Intense
37.0Intense
47.0Intense
57.0Intense
67.0Intense
77.0Intense
87.0Intense
97.0Intense
107.0Intense
117.0Intense
127.0Intense
137.0Intense
147.0Intense
157.0Intense
166.9Intense
176.9Intense
186.9Intense
196.9Intense
206.9Intense
216.9Intense
226.9Intense
236.9Intense
246.9Intense
256.9Intense
266.8Intense
276.8Intense
286.8Intense
296.8Intense
306.8Intense
316.8Intense
Planning a trip in October

Hazard calendar for Castelo do Piauí

In seasonPeak

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

Castelo do Piauí's monsoon runs January–April, when most of the year's rain falls.

Monsoon
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is October a good time to visit Castelo do Piauí?

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

2.0
Sightseeing
12th-best month of the year
5.5
Beach & pool
6th-best month of the year

October is a weaker month for outdoor sightseeing in Castelo do Piauí.

What to pack for Castelo do Piauí in October

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

In October, Castelo do Piauí sees daytime highs around 37°C and nights near 25°C. Pack light clothes and sun protection.

light clothessun protection

UV index in Castelo do Piauí in October

LowModerateHighVery highExtreme

Clear-sky midday UV in October peaks around 12 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Castelo do Piauí peaks around March 15 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 24 at about 10 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeExtremeMar 15UV 15Jul 24UV 10
UV index (midday)Level
Jan13Extreme
Feb14Extreme
Mar15Extreme
Apr14Extreme
May11Extreme
Jun10Extreme
Jul10Very high
Aug10Very high
Sep12Extreme
Oct12Extreme
Nov12Extreme
Dec11Extreme
Location & terrain

Where is Castelo do Piauí?

Castelo do Piauí sits at 5.3°S, 41.6°W, 241 m above sea level, in Brazil. The nearest listed city is São Miguel do Tapuio, 32 km away.

Topography around Castelo do Piauí

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

Within 3 km, the terrain around Castelo do Piauí has only modest variations in elevation — a maximum elevation change of 82 m around an average of 249 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 300 m; within 80 km, large variations in elevation — a maximum elevation change of 790 m.

The land around Castelo do Piauí is covered by shrubs (67%) within 3 km, shrubs (63%) and trees (31%) within 16 km, and shrubs (65%) and trees (27%) within 80 km.

3 km
82 m
16 km
300 m
80 km
790 m
treesshrubsgrasslandcroplandartificial surfaces
October weather nearby: São Miguel do Tapuio 32 km · Campo Maior 88 km · Novo Oriente 89 km · Crateús 99 km · Pedro II 100 km · Altos 105 km · Quiterianópolis 111 km · Piripiri 119 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 do Piauí (-5.3222°, -41.5525°, elevation 241 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. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).