São João de Pirabas weather in September

In September, São João de Pirabas sees average daytime highs of 30°C and overnight lows near 25°C, with 18 mm of rain across 6.3 wet days and about 12 hours of daylight. It is the 3rd-warmest and 11th-wettest month of the year here.

Day-to-day highs hold fairly steady near 30°C through the month. The sky is clear or mostly clear about 67% 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 São João de Pirabas's 1st-clearest and 1st-windiest month. For the whole year in context, see São João de Pirabas's year-round climate.

Daytime high
30°
3rd warmest
Overnight low
25°
10th coldest
Rainfall
18 mm
6.3 wet days
Daylight
12 hours
6:03 AM – 6:03 PM
Cloud cover
38%
1st clearest
Wind
15 km/h
1st windiest
Solar energy
6.2 kWh/m²
Travel score
5.9
out of 10

São João de Pirabas 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 30°C through the month.

A typical September day in São João de Pirabas reaches about 30°C in the afternoon and slips back to 25°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between 29°C and 30°C. Set against its neighbours, September runs on par with August and on par with October.

20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
13025
23025
33025
43025
53025
63025
73025
83025
93025
103025
113025
123025
133025
143025
153025
163025
173025
183025
193025
203025
213025
223025
233025
243025
253025
263025
273025
283025
293025
303025

How September really feels in São João de Pirabas

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.

São João de Pirabas weather by month

How September compares with the rest of the year at a glance. September is the 3rd-warmest and 11th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan29° / 24°29628.6123.2
Feb28° / 24°40427.3123.1
Mar28° / 24°51030.6123.0
Apr28° / 24°45929.5123.0
May29° / 24°31528.5123.2
Jun29° / 24°14725.6123.5
Jul29° / 24°10122.8124.0
Aug29° / 25°4015.5124.9
Sep30° / 25°186.3125.9
Oct30° / 25°144.4125.9
Nov30° / 25°257.4125.4
Dec30° / 25°9918.4124.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 67% of the time in September, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 21% of September, with mostly cloudy or overcast conditions the remaining 12%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
19010
29010
39010
48911
58911
68911
78911
88911
98911
109010
118911
128911
138911
148911
158911
168911
178713
188713
198713
208713
218713
228614
238614
248614
258614
268614
278515
288515
298416
308416

Chance of precipitation in September

Any precipitation

São João de Pirabas gets around 18 mm of rain over 6.3 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 21% and peaks near 29% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%151015202530
Rain chance (%)
129
228
328
427
527
626
726
825
925
1025
1125
1224
1324
1423
1523
1622
1721
1821
1920
2019
2118
2218
2317
2416
2515
2614
2714
2813
2913
3013

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 77% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Oppressive (%)Miserable (%)
16733
26832
36931
47030
57129
67228
77228
87327
97327
107426
117426
127525
137525
147624
157723
167822
177822
187921
198020
208119
218119
228218
238218
248317
258317
268416
278416
288416
298416
308416

Wind in September

Winds average 15 km/h in September, the windiest month of the year.

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

05101520151015202530
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
2115light breeze
2215light breeze
2315light breeze
2415light breeze
2515light breeze
2615light breeze
2715light breeze
2815light breeze
2915light breeze
3015light breeze

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 6:09 AM to 5:58 AM, and sunset from 6:08 PM to 5:58 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.06:096:08
212.06:096:08
312.06:086:07
412.06:086:07
512.06:076:07
612.06:076:06
712.06:076:06
812.06:066:06
912.06:066:05
1012.06:066:05
1112.06:056:05
1212.06:056:04
1312.06:046:04
1412.06:046:04
1512.06:046:03
1612.06:036:03
1712.06:036:03
1812.06:026:02
1912.06:026:02
2012.06:026:02
2112.06:016:01
2212.06:016:01
2312.06:006:00
2412.06:006:00
2512.06:006:00
2612.05:595:59
2712.05:595:59
2812.05:595:59
2912.05:585:59
3012.05:585:58

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.2 kWh/m².

For context, solar energy here swings from a low near 4.09 kWh/m² to a high of 6.33 kWh/m² in October across the year — September's 6.2 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
96.1Intense
106.1Intense
116.2Intense
126.2Intense
136.2Intense
146.2Intense
156.2Intense
166.2Intense
176.2Intense
186.2Intense
196.2Intense
206.3Intense
216.3Intense
226.3Intense
236.3Intense
246.3Intense
256.3Intense
266.3Intense
276.3Intense
286.3Intense
296.3Intense
306.3Intense
Planning a trip in September

Hazard calendar for São João de Pirabas

In seasonPeak

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

São João de Pirabas's monsoon runs January–May, 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 São João de Pirabas?

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

5.9
Sightseeing
1st-best month of the year
7.8
Beach & pool
2nd-best month of the year

September is a reasonable time to visit São João de Pirabas for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for São João de Pirabas in September

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

In September, São João de Pirabas sees daytime highs around 30°C and nights near 25°C. Pack light clothes and sun protection. About 6 days see rain.

light clothessun protection

Sea temperature near São João de Pirabas in September

The nearest coast averages about 28°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 18 km away) is warmest in June at about 29°C and coldest in September near 28°C.

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

26°28°30°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan28Tropical
Feb28Tropical
Mar28Tropical
Apr28Tropical
May29Tropical
Jun29Tropical
Jul28Tropical
Aug28Tropical
Sep28Warm
Oct28Tropical
Nov28Tropical
Dec28Tropical

UV index in São João de Pirabas 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 São João de Pirabas peaks around March 16 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 18 at about 10 (extreme).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeMar 16UV 15Jul 18UV 10
UV index (midday)Level
Jan13Extreme
Feb14Extreme
Mar15Extreme
Apr14Extreme
May12Extreme
Jun11Extreme
Jul10Extreme
Aug11Extreme
Sep12Extreme
Oct12Extreme
Nov11Extreme
Dec11Extreme

Air quality in São João de Pirabas 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 São João de Pirabas is worst in February — around 22 µg/m³ PM2.5 (moderate), about 3.2× the cleanest month (July, 7 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateFeb 2022 µg/m³Jul 127 µg/m³
PM2.5 (µg/m³)Level
Jan18Moderate
Feb22Moderate
Mar21Moderate
Apr16Moderate
May9Good
Jun7Good
Jul7Good
Aug8Good
Sep10Good
Oct11Good
Nov13Moderate
Dec15Moderate
Location & terrain

Where is São João de Pirabas?

São João de Pirabas sits at 0.8°S, 47.2°W, 26 m above sea level, in Brazil. The nearest listed city is Salinópolis, 26 km away.

Topography around São João de Pirabas

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of São João de Pirabas.

Within 3 km, the terrain around São João de Pirabas has only modest variations in elevation — a maximum elevation change of 31 m around an average of 9 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 58 m; within 80 km, only modest variations in elevation — a maximum elevation change of 111 m.

The land around São João de Pirabas is covered by mangroves (37%), water (30%) and trees (23%) within 3 km, trees (39%), water (26%) and mangroves (26%) within 16 km, and trees (37%) and water (37%) within 80 km.

3 km
31 m
16 km
58 m
80 km
111 m
treesgrasslandartificial surfaceswaterwetlandmangroves
September weather nearby: Salinópolis 26 km · Maracanã 31 km · Tracuateua 45 km · Capanema 47 km · Bragança 55 km · Marapanim 58 km · Igarapé-Açu 63 km · Augusto Corrêa 66 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 São João de Pirabas (-0.7747°, -47.1772°, elevation 26 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. 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).