Amarante do Maranhão weather in September

In September, Amarante do Maranhão sees average daytime highs of 34°C and overnight lows near 22°C, with 11 mm of rain across 2 wet days and about 12 hours of daylight. It is the 1st-warmest and 9th-wettest month of the year here.

Day-to-day highs hold fairly steady near 34°C through the month. The sky is clear or mostly clear about 67% of the time in September, and the air most often feels muggy.

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 Amarante do Maranhão's 3rd-clearest and 3rd-windiest month. For the whole year in context, see Amarante do Maranhão's year-round climate.

Daytime high
34°
1st warmest
Overnight low
22°
9th coldest
Rainfall
11 mm
2 wet days
Daylight
12 hours
6:02 AM – 6:00 PM
Cloud cover
35%
3rd clearest
Wind
10 km/h
3rd windiest
Solar energy
6.33 kWh/m²
Travel score
3.8
out of 10

Amarante do Maranhão 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 34°C through the month.

A typical September day in Amarante do Maranhão reaches about 34°C in the afternoon and slips back to 22°C overnight — a 12°C spread between the day's warmth and the night's chill. On most days the high lands between 32°C and 36°C. Set against its neighbours, September runs on par with August and on par with October.

20°25°30°35°40°151015202530
Avg high (°C)Avg low (°C)
13422
23422
33422
43422
53422
63422
73422
83422
93422
103422
113422
123422
133422
143422
153422
163422
173422
183422
193422
203422
213422
223423
233423
243423
253423
263423
273423
283423
293423
303423

How September really feels in Amarante do Maranhão

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.

Amarante do Maranhão weather by month

How September compares with the rest of the year at a glance. September is the 1st-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 22°21426.412.33.0
Feb30° / 22°2082412.23.0
Mar30° / 22°21527.2122.9
Apr30° / 22°15321.611.93.3
May31° / 22°7711.611.84.3
Jun32° / 21°8211.75.0
Jul33° / 21°50.911.74.8
Aug34° / 21°20.411.84.3
Sep34° / 22°112123.8
Oct33° / 23°386.112.13.6
Nov32° / 23°9113.712.33.5
Dec31° / 23°16020.212.33.3

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 67% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 17% of September, with mostly cloudy or overcast conditions the remaining 16%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
18812
28713
38713
48713
58713
68713
78713
88713
98812
108713
118713
128614
138614
148614
158614
168515
178416
188416
198416
208317
218317
228218
238119
248119
258020
268020
277921
287921
297822
307822

Chance of precipitation in September

Any precipitation

Amarante do Maranhão gets around 11 mm of rain over 2 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 7% and peaks near 12% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%151015202530
Rain chance (%)
13
23
34
44
54
64
75
85
95
105
115
125
136
146
156
166
176
187
197
207
218
228
239
249
2510
2610
2711
2811
2912
3012

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the muggy band about 57% of days. Sticky, muggy-or-worse air turns up on roughly 77% of them.

0%25%50%75%100%151015202530
Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
16305113
26305014
36295114
46295015
56295015
66285115
76285115
86275116
96275116
105265316
115255317
125245417
135235517
144225618
154215718
164205719
173195919
183176020
193166021
203146122
212136223
222126224
232106226
24196327
25196228
26186229
27176230
28166231
29066232
30056233

Wind in September

Winds average 10 km/h in September.

Across September, daily wind ranges from about 9 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
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 6:10 AM to 5:55 AM, and sunset from 6:03 PM to 5:58 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.96:106:03
211.96:096:03
311.96:096:03
411.96:086:03
511.96:086:03
611.96:076:03
711.96:076:02
811.96:066:02
911.96:066:02
1011.96:056:02
1111.96:056:01
1211.96:046:01
1312.06:046:01
1412.06:036:01
1512.06:036:01
1612.06:026:00
1712.06:026:00
1812.06:016:00
1912.06:016:00
2012.06:006:00
2112.06:005:59
2212.05:595:59
2312.05:595:59
2412.05:585:59
2512.05:575:59
2612.05:575:58
2712.05:565:58
2812.05:565:58
2912.05:555:58
3012.05:555:58

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.33 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 4.46 kWh/m² to a high of 6.33 kWh/m² in September across the year — September's 6.33 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
16.3Intense
26.3Intense
36.3Intense
46.3Intense
56.3Intense
66.3Intense
76.3Intense
86.3Intense
96.3Intense
106.3Intense
116.4Intense
126.4Intense
136.4Intense
146.4Intense
156.4Intense
166.4Intense
176.4Intense
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 Amarante do Maranhão

In seasonPeak

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

Amarante do Maranhão's monsoon runs December–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 Amarante do Maranhão?

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

3.8
Sightseeing
5th-best month of the year
7.5
Beach & pool
4th-best month of the year

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

What to pack for Amarante do Maranhão in September

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

In September, Amarante do Maranhão sees daytime highs around 34°C and nights near 22°C. Pack light clothes and sun protection.

light clothessun protection

UV index in Amarante do Maranhão 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 Amarante do Maranhão peaks around March 11 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 12 at about 10 (extreme).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeMar 11UV 15Jul 12UV 10
UV index (midday)Level
Jan14Extreme
Feb15Extreme
Mar16Extreme
Apr14Extreme
May11Extreme
Jun10Extreme
Jul10Extreme
Aug11Extreme
Sep12Extreme
Oct12Extreme
Nov11Extreme
Dec10Extreme

Air quality in Amarante do Maranhão 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 Amarante do Maranhão is worst in October — around 41 µg/m³ PM2.5 (poor), about 6.5× the cleanest month (June, 6 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModeratePoorModerateOct 1340 µg/m³Jun 166 µg/m³
PM2.5 (µg/m³)Level
Jan13Moderate
Feb13Moderate
Mar12Good
Apr11Good
May9Good
Jun6Good
Jul9Good
Aug17Moderate
Sep37Poor
Oct41Poor
Nov29Moderate
Dec20Moderate
Location & terrain

Where is Amarante do Maranhão?

Amarante do Maranhão sits at 5.6°S, 46.7°W, 247 m above sea level, in Brazil. The nearest listed city is Sítio Novo, 35 km away.

Topography around Amarante do Maranhão

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

Within 3 km, the terrain around Amarante do Maranhão has only modest variations in elevation — a maximum elevation change of 87 m around an average of 252 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 185 m; within 80 km, significant variations in elevation — a maximum elevation change of 456 m.

The land around Amarante do Maranhão is covered by grassland (63%) and trees (28%) within 3 km, trees (50%) and grassland (47%) within 16 km, and trees (57%) and grassland (40%) within 80 km.

3 km
87 m
16 km
185 m
80 km
456 m
treesshrubsgrasslandcroplandartificial surfaceswater
September weather nearby: Sítio Novo 35 km · Governador Edison Lobão 72 km · Grajaú 72 km · João Lisboa 74 km · Imperatriz 83 km · Açailândia 109 km · Arame 111 km · Porto Franco 112 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 Amarante do Maranhão (-5.5667°, -46.7422°, elevation 247 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).