Bacabal weather in September

In September, Bacabal sees average daytime highs of 35°C and overnight lows near 24°C, with 7 mm of rain across 1.3 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 35°C through the month. The sky is clear or mostly clear about 69% of the time in September, and the air most often feels oppressive.

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 Bacabal's 2nd-clearest and 2nd-windiest month. For the whole year in context, see Bacabal's year-round climate.

Daytime high
35°
2nd warmest
Overnight low
24°
9th coldest
Rainfall
7 mm
1.3 wet days
Daylight
12 hours
5:54 AM – 5:53 PM
Cloud cover
35%
2nd clearest
Wind
9 km/h
2nd windiest
Solar energy
6.27 kWh/m²
Travel score
3.0
out of 10

Bacabal 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 35°C through the month.

A typical September day in Bacabal reaches about 35°C in the afternoon and slips back to 24°C overnight — a 11°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 1°C warmer than August and on par with October.

20°25°30°35°40°151015202530
Avg high (°C)Avg low (°C)
13524
23524
33524
43524
53524
63524
73524
83524
93524
103524
113524
123524
133524
143524
153524
163524
173524
183524
193524
203524
213524
223524
233524
243624
253625
263625
273625
283625
293625
303625

How September really feels in Bacabal

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
18 feel dangerously hot (≥ 39°C)
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.

Bacabal 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° / 24°24925.212.22.6
Feb31° / 23°2672512.12.5
Mar31° / 23°31629.1122.5
Apr31° / 24°26526.711.92.6
May31° / 24°13018.511.83.5
Jun32° / 23°357.311.84.5
Jul33° / 23°15311.84.4
Aug34° / 23°51.111.93.7
Sep35° / 24°71.3123.0
Oct36° / 25°173.412.12.6
Nov35° / 25°518.212.22.6
Dec34° / 24°13115.412.22.7

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 69% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 22% of September, with mostly cloudy or overcast conditions the remaining 10%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
1937
2937
3937
4937
5928
6928
7928
8928
9928
10928
11928
12919
13919
149010
159010
169010
179010
189010
199010
209010
218911
228911
238911
248911
258911
268911
278812
288713
298713
308713

Chance of precipitation in September

Any precipitation

Bacabal gets around 7 mm of rain over 1.3 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 4% and peaks near 6% on the wettest days.

0%10%20%30%151015202530
Rain chance (%)
13
24
34
44
54
64
74
84
94
104
114
124
134
144
154
164
174
184
194
205
215
225
235
245
255
265
275
286
296
306

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 64% of days. Sticky, muggy-or-worse air turns up on roughly 96% of them.

0%25%50%75%100%151015202530
Humid (%)Muggy (%)Oppressive (%)
163163
263262
363262
463361
563361
663460
763559
863559
963559
1063658
1163658
1253659
1353560
1453560
1543561
1643561
1743462
1833463
1933364
2023365
2123266
2223167
2323068
2413069
2512970
2612970
2712970
2812871
2902872
3002872

Wind in September

Winds average 9 km/h in September.

Across September, daily wind ranges from about 8 km/h on the calmest days to 9 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
18calm
28calm
38calm
48calm
58calm
68calm
78calm
88calm
98calm
108calm
118calm
128calm
138calm
149calm
159calm
169calm
179calm
189calm
199calm
209calm
219calm
229calm
239calm
249calm
259calm
269calm
279calm
289calm
299calm
309calm

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 6:01 AM to 5:47 AM, and sunset from 5:56 PM to 5:49 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.96:015:56
211.96:015:56
311.96:005:56
411.96:005:56
511.95:595:55
611.95:595:55
711.95:595:55
811.95:585:55
911.95:585:55
1012.05:575:54
1112.05:575:54
1212.05:565:54
1312.05:565:54
1412.05:555:53
1512.05:555:53
1612.05:545:53
1712.05:545:53
1812.05:535:52
1912.05:535:52
2012.05:525:52
2112.05:525:52
2212.05:515:51
2312.05:515:51
2412.05:505:51
2512.05:505:51
2612.05:495:50
2712.05:495:50
2812.05:485:50
2912.05:485:50
3012.05:475:49

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.27 kWh/m².

For context, solar energy here swings from a low near 4.36 kWh/m² to a high of 6.3 kWh/m² in October across the year — September's 6.27 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
16.1Intense
26.1Intense
36.2Intense
46.2Intense
56.2Intense
66.2Intense
76.2Intense
86.2Intense
96.2Intense
106.2Intense
116.2Intense
126.3Intense
136.3Intense
146.3Intense
156.3Intense
166.3Intense
176.3Intense
186.3Intense
196.3Intense
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 Bacabal

In seasonPeak

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

Bacabal'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 Bacabal?

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

3.0
Sightseeing
5th-best month of the year
6.6
Beach & pool
4th-best month of the year

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

What to pack for Bacabal in September

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

In September, Bacabal sees daytime highs around 35°C and nights near 24°C. Pack light clothes and sun protection.

light clothessun protection

UV index in Bacabal 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 Bacabal peaks around March 14 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.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highExtremeMar 14UV 15Jul 24UV 10
UV index (midday)Level
Jan13Extreme
Feb14Extreme
Mar15Extreme
Apr13Extreme
May11Extreme
Jun10Extreme
Jul10Very high
Aug10Very high
Sep12Extreme
Oct12Extreme
Nov11Extreme
Dec10Extreme

Air quality in Bacabal 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 Bacabal is worst in November — around 27 µg/m³ PM2.5 (moderate), about 3.2× the cleanest month (June, 9 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateNov 1426 µg/m³Jun 189 µg/m³
PM2.5 (µg/m³)Level
Jan15Moderate
Feb15Moderate
Mar14Moderate
Apr13Moderate
May11Good
Jun9Good
Jul10Good
Aug10Good
Sep13Moderate
Oct22Moderate
Nov27Moderate
Dec20Moderate
Location & terrain

Where is Bacabal?

Bacabal sits at 4.2°S, 44.8°W, 24 m above sea level, in Brazil. The nearest listed city is São Luís Gonzaga do Maranhão, 20 km away.

Topography around Bacabal

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

Within 3 km, the terrain around Bacabal has only modest variations in elevation — a maximum elevation change of 26 m around an average of 20 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 100 m; within 80 km, significant variations in elevation — a maximum elevation change of 260 m.

The land around Bacabal is covered by grassland (47%) and artificial surfaces (29%) within 3 km, grassland (71%) and trees (22%) within 16 km, and grassland (56%) and trees (39%) within 80 km.

3 km
26 m
16 km
100 m
80 km
260 m
treesshrubsgrasslandartificial surfacesbare terrainwaterwetland
September weather nearby: São Luís Gonzaga do Maranhão 20 km · Alto Alegre do Maranhão 37 km · Olho d’Água das Cunhãs 39 km · São Mateus do Maranhão 40 km · Trizidela do Vale 42 km · Pedreiras 43 km · Vitorino Freire 52 km · Peritoró 52 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 Bacabal (-4.2325°, -44.7816°, elevation 24 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).