Valença do Piauí weather in September

In September, Valença do Piauí sees average daytime highs of 36°C and overnight lows near 24°C, with 3 mm of rain across 0.3 wet days and about 12 hours of daylight. It is the 2nd-warmest and 11th-wettest month of the year here.

Day-to-day highs hold fairly steady near 36°C through the month. The sky is clear or mostly clear about 71% of the time in September, and the air most often feels comfortable.

Daylight stretches from about 11 h 54 min at the start of September to 12 hours by month's end. Set against the rest of the year, September is Valença do Piauí's 2nd-clearest and 4th-windiest month. For the whole year in context, see Valença do Piauí's year-round climate.

Daytime high
36°
2nd warmest
Overnight low
24°
9th coldest
Rainfall
3 mm
0.3 wet days
Daylight
12 hours
5:42 AM – 5:40 PM
Cloud cover
32%
2nd clearest
Wind
13 km/h
4th windiest
Solar energy
6.82 kWh/m²
Travel score
2.9
out of 10

Valença do Piauí is human settlement in Brazil.

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 36°C through the month.

A typical September day in Valença do Piauí reaches about 36°C in the afternoon and slips back to 24°C overnight — a 12°C spread between the day's warmth and the night's chill. On most days the high lands between 34°C and 37°C. Set against its neighbours, September runs about 2°C warmer than August and on par with October.

20°25°30°35°40°151015202530
Avg high (°C)Avg low (°C)
13523
23523
33523
43523
53523
63523
73523
83523
93523
103523
113523
123524
133524
143624
153624
163624
173624
183624
193624
203624
213624
223624
233624
243624
253624
263624
273625
283625
293625
303625

How September really feels in Valença do Piauí

Once humidity and wind are folded in, September averages 30 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
30
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

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

Valença do Piauí weather by month

How September compares with the rest of the year at a glance. September is the 2nd-warmest and 11th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan32° / 23°19620.312.33.1
Feb31° / 22°18919.912.23.2
Mar31° / 22°21823.5123.2
Apr31° / 22°13716.611.93.7
May32° / 23°476.811.74.4
Jun32° / 22°81.211.64.8
Jul33° / 22°40.611.74.6
Aug34° / 22°10.211.83.9
Sep36° / 24°30.3122.9
Oct36° / 25°14212.12.4
Nov35° / 25°345.912.32.6
Dec34° / 24°7310.212.43.1

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 71% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 18% of September, with mostly cloudy or overcast conditions the remaining 11%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
18812
28812
38812
48812
58812
68812
78812
88911
98911
108911
118911
128911
139010
149010
15919
16919
17919
18919
19919
20919
219010
228911
238911
248812
258812
268713
278713
288515
298515
308416

Chance of precipitation in September

Any precipitation

Valença do Piauí gets around 3 mm of rain over 0.3 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 1% and peaks near 2% on the wettest days.

0%10%20%30%151015202530
Rain chance (%)
11
21
31
41
51
61
71
81
91
101
111
121
131
141
151
161
171
181
191
201
211
221
231
241
251
261
271
282
292
302

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the comfortable band about 61% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
11267201
21266202
31266202
41266202
51266202
61265212
71265212
81265212
91264222
101263223
111263223
121262233
131262233
141261243
151261243
161260253
171161253
181160263
191160263
201159273
211159273
221059283
231059283
241057294
251057294
26958294
27957304
28957304
29956305
30955315

Wind in September

Winds average 13 km/h in September.

Across September, daily wind ranges from about 12 km/h on the calmest days to 14 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
114light breeze
214light breeze
314light breeze
414light breeze
514light breeze
614light breeze
714light breeze
814light breeze
914light breeze
1014light breeze
1114light breeze
1214light breeze
1314light breeze
1414light breeze
1513light breeze
1613light breeze
1713light breeze
1813light breeze
1913light breeze
2013light breeze
2113light breeze
2213light breeze
2312light breeze
2412light breeze
2512light breeze
2612light breeze
2712calm
2812calm
2912calm
3012calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 54 min at the start of September to 12 hours by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 6 minutes over September. Sunrise moves from 5:50 AM to 5:35 AM, and sunset from 5:43 PM to 5:38 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.95:505:43
211.95:505:43
311.95:495:43
411.95:495:42
511.95:485:42
611.95:485:42
711.95:475:42
811.95:475:42
911.95:465:42
1011.95:465:41
1111.95:455:41
1211.95:455:41
1311.95:445:41
1412.05:435:41
1512.05:435:40
1612.05:425:40
1712.05:425:40
1812.05:415:40
1912.05:415:40
2012.05:405:40
2112.05:405:39
2212.05:395:39
2312.05:385:39
2412.05:385:39
2512.05:375:39
2612.05:375:38
2712.05:365:38
2812.05:365:38
2912.05:355:38
3012.05:355:38

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.82 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 4.97 kWh/m² to a high of 6.82 kWh/m² in September across the year — September's 6.82 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
16.6Intense
26.6Intense
36.7Intense
46.7Intense
56.7Intense
66.7Intense
76.7Intense
86.7Intense
96.8Intense
106.8Intense
116.8Intense
126.8Intense
136.8Intense
146.8Intense
156.8Intense
166.8Intense
176.9Intense
186.9Intense
196.9Intense
206.9Intense
216.9Intense
226.9Intense
236.9Intense
246.9Intense
256.9Intense
266.9Intense
276.9Intense
286.9Intense
296.9Intense
306.9Intense
Planning a trip in September

Hazard calendar for Valença do Piauí

In seasonPeak

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

Valença 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 September a good time to visit Valença do Piauí?

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

2.9
Sightseeing
10th-best month of the year
6.5
Beach & pool
5th-best month of the year

September is a weaker month for outdoor sightseeing in Valença do Piauí. The water and warmth also suit a beach or pool day.

What to pack for Valença do Piauí in September

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

In September, Valença do Piauí sees daytime highs around 36°C and nights near 24°C. Pack light clothes and sun protection.

light clothessun protection

UV index in Valença do Piauí in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September 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 Valença do Piauí peaks around March 11 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 11UV 15Jul 17UV 10
UV index (midday)Level
Jan14Extreme
Feb15Extreme
Mar15Extreme
Apr13Extreme
May11Extreme
Jun10Very high
Jul10Very high
Aug10Very high
Sep12Extreme
Oct12Extreme
Nov12Extreme
Dec12Extreme
Location & terrain

Where is Valença do Piauí?

Valença do Piauí sits at 6.4°S, 41.7°W, 336 m above sea level, in Brazil. The nearest listed city is Picos, 81 km away.

Topography around Valença do Piauí

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

Within 3 km, the terrain around Valença do Piauí has only modest variations in elevation — a maximum elevation change of 112 m around an average of 334 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 322 m; within 80 km, large variations in elevation — a maximum elevation change of 609 m.

The land around Valença do Piauí is covered by trees (49%) and shrubs (27%) within 3 km, trees (64%) and shrubs (33%) within 16 km, and trees (46%) and shrubs (45%) within 80 km.

3 km
112 m
16 km
322 m
80 km
609 m
treesshrubsgrasslandcroplandartificial surfaces
September weather nearby: Picos 81 km · Oeiras 81 km · Regeneração 106 km · São Miguel do Tapuio 111 km · Água Branca 114 km · Parambu 118 km · Castelo do Piauí 123 km · Amarante 123 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 Valença do Piauí (-6.4075°, -41.7456°, elevation 336 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).