Prainha weather in September

In September, Prainha sees average daytime highs of 33°C and overnight lows near 25°C, with 31 mm of rain across 5.7 wet days and about 12 hours of daylight. It is the 2nd-warmest and 12th-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 56% of the time in September, and the air most often feels oppressive.

Daylight stretches from about 12 hours at the start of September to 12 hours by month's end. Set against the rest of the year, September is Prainha's 2nd-clearest and 1st-windiest month. For the whole year in context, see Prainha's year-round climate.

Daytime high
33°
2nd warmest
Overnight low
25°
10th coldest
Rainfall
31 mm
5.7 wet days
Daylight
12 hours
6:29 AM – 6:28 PM
Cloud cover
43%
2nd clearest
Wind
10 km/h
1st windiest
Solar energy
6.28 kWh/m²
Travel score
3.9
out of 10

Prainha 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 33°C through the month.

A typical September day in Prainha reaches about 33°C in the afternoon and slips back to 25°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 32°C and 34°C. Set against its neighbours, September runs about 1°C warmer than August and on par with October.

20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
13325
23325
33325
43325
53325
63325
73325
83325
93325
103325
113325
123325
133325
143325
153325
163325
173325
183325
193325
203325
213325
223325
233325
243325
253325
263325
273325
283325
293325
303325

How September really feels in Prainha

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.

Prainha weather by month

How September compares with the rest of the year at a glance. September is the 2nd-warmest and 12th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan31° / 24°24124.312.13.0
Feb30° / 24°24623.912.13.0
Mar30° / 24°32028.1122.8
Apr30° / 24°33228.1122.8
May30° / 24°25928.211.92.9
Jun30° / 24°13922.111.93.4
Jul31° / 24°8916.511.94.1
Aug32° / 25°377.911.94.4
Sep33° / 25°315.7123.9
Oct33° / 25°427.1123.6
Nov33° / 25°751012.13.4
Dec32° / 25°11915.812.13.3

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 56% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 21% of September, with mostly cloudy or overcast conditions the remaining 23%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
18119
28119
38119
48020
57921
67921
77921
87921
97921
107921
117822
127822
137822
147822
157723
167822
177822
187723
197723
207624
217624
227624
237525
247426
257327
267327
277228
287129
297030
306931

Chance of precipitation in September

Any precipitation

Prainha gets around 31 mm of rain over 5.7 wet days in September, the driest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 19% and peaks near 22% on the wettest days.

0%10%20%30%151015202530
Rain chance (%)
121
221
321
421
522
622
722
822
922
1021
1121
1221
1321
1420
1520
1619
1719
1818
1918
2017
2117
2217
2317
2417
2517
2617
2717
2817
2918
3018

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the oppressive band about 80% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Muggy (%)Oppressive (%)Miserable (%)
117623
217623
317623
417623
527523
627523
727523
827523
927622
1027622
1127622
1227622
1327721
1427820
1527820
1627919
1728018
1818217
1918316
2018316
2118415
2218514
2318613
2428513
2528612
2628612
2728612
2828711
2928711
3028711

Wind in September

Winds average 10 km/h in September, the windiest month of the year.

Across September, daily wind ranges from about 10 km/h on the calmest days to 10 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
110calm
210calm
310calm
410calm
510calm
610calm
710calm
810calm
910calm
1010calm
1110calm
1210calm
1310calm
1410calm
1510calm
1610calm
1710calm
1810calm
1910calm
2010calm
2110calm
2210calm
2310calm
2410calm
2510calm
2610calm
2710calm
2810calm
2910calm
3010calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 hours 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 0 minutes over September. Sunrise moves from 6:35 AM to 6:23 AM, and sunset from 6:33 PM to 6:24 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.06:356:33
212.06:346:32
312.06:346:32
412.06:346:32
512.06:336:31
612.06:336:31
712.06:326:31
812.06:326:31
912.06:316:30
1012.06:316:30
1112.06:316:30
1212.06:306:29
1312.06:306:29
1412.06:296:29
1512.06:296:28
1612.06:296:28
1712.06:286:28
1812.06:286:27
1912.06:276:27
2012.06:276:27
2112.06:266:26
2212.06:266:26
2312.06:266:26
2412.06:256:25
2512.06:256:25
2612.06:246:25
2712.06:246:25
2812.06:246:24
2912.06:236:24
3012.06:236:24

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.28 kWh/m².

For context, solar energy here swings from a low near 3.97 kWh/m² to a high of 6.41 kWh/m² in October across the year — September's 6.28 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
16.0Intense
26.0Intense
36.0Intense
46.1Intense
56.1Intense
66.1Intense
76.1Intense
86.1Intense
96.2Intense
106.2Intense
116.2Intense
126.2Intense
136.2Intense
146.3Intense
156.3Intense
166.3Intense
176.3Intense
186.3Intense
196.4Intense
206.4Intense
216.4Intense
226.4Intense
236.4Intense
246.4Intense
256.4Intense
266.5Intense
276.5Intense
286.5Intense
296.5Intense
306.5Intense
Planning a trip in September

Hazard calendar for Prainha

In seasonPeak

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

Prainha's rainy season runs January–May, when most of the year's rain falls.

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

Is September a good time to visit Prainha?

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

3.9
Sightseeing
3rd-best month of the year
7.0
Beach & pool
1st-best month of the year

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

What to pack for Prainha in September

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

In September, Prainha sees daytime highs around 33°C and nights near 25°C. Pack light clothes and sun protection. About 6 days see rain.

light clothessun protection

UV index in Prainha 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 Prainha peaks around March 14 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 23 at about 10 (extreme).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeMar 14UV 15Jun 23UV 10
UV index (midday)Level
Jan13Extreme
Feb15Extreme
Mar15Extreme
Apr14Extreme
May12Extreme
Jun10Extreme
Jul10Extreme
Aug10Extreme
Sep12Extreme
Oct12Extreme
Nov11Extreme
Dec11Extreme

Air quality in Prainha in September

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where September falls, not just the annual average.

Air quality in Prainha is worst in November — around 26 µg/m³ PM2.5 (moderate), about 2.9× the cleanest month (June, 9 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateNov 1626 µg/m³Jun 239 µg/m³
PM2.5 (µg/m³)Level
Jan16Moderate
Feb17Moderate
Mar17Moderate
Apr14Moderate
May10Good
Jun9Good
Jul9Good
Aug10Good
Sep12Moderate
Oct20Moderate
Nov26Moderate
Dec20Moderate
Location & terrain

Where is Prainha?

Prainha sits at 1.8°S, 53.5°W, 35 m above sea level, in Brazil. The nearest listed city is Monte Alegre, 70 km away.

Topography around Prainha

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

Within 3 km, the terrain around Prainha has only modest variations in elevation — a maximum elevation change of 52 m around an average of 21 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 111 m; within 80 km, large variations in elevation — a maximum elevation change of 631 m.

The land around Prainha is covered by trees (39%), water (32%) and grassland (23%) within 3 km, trees (37%), water (31%) and grassland (23%) within 16 km, and trees (66%) within 80 km.

3 km
52 m
16 km
111 m
80 km
631 m
treesgrasslandartificial surfaceswaterwetland
September weather nearby: Monte Alegre 70 km · Almeirim 104 km · Porto de Moz 138 km · Alenquer 141 km · Laranjal do Jari 153 km · Santarém 154 km · Mojuí dos Campos 162 km · Belterra 187 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 Prainha (-1.8°, -53.48°, elevation 35 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).