Muaná weather in September

In September, Muaná sees average daytime highs of 32°C and overnight lows near 25°C, with 17 mm of rain across 4.7 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 32°C through the month. The sky is clear or mostly clear about 65% 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 Muaná's 2nd-clearest and 2nd-windiest month. For the whole year in context, see Muaná's year-round climate.

Daytime high
32°
2nd warmest
Overnight low
25°
10th coldest
Rainfall
17 mm
4.7 wet days
Daylight
12 hours
6:11 AM – 6:11 PM
Cloud cover
38%
2nd clearest
Wind
11 km/h
2nd windiest
Solar energy
6.46 kWh/m²
Travel score
4.5
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 32°C through the month.

A typical September day in Muaná reaches about 32°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 31°C and 33°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)
13225
23225
33225
43225
53225
63225
73225
83225
93225
103225
113225
123225
133225
143225
153225
163225
173225
183225
193225
203225
213225
223225
233225
243225
253225
263225
273225
283225
293225
303225

How September really feels in Muaná

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.

Muaná 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
Jan30° / 24°24327.712.12.8
Feb30° / 24°32526.8122.7
Mar30° / 24°43530.5122.7
Apr30° / 24°42229.6122.6
May31° / 24°30527.911.92.8
Jun31° / 24°14221.111.93.4
Jul31° / 24°7815.311.94.0
Aug32° / 25°328.6124.4
Sep32° / 25°174.7124.5
Oct32° / 25°194.7124.4
Nov32° / 25°366.712.14.1
Dec32° / 25°10516.912.13.5

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 65% 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 14%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
18911
28911
38911
48911
59010
69010
78911
88911
98911
108911
118911
128812
138812
148713
158713
168614
178515
188515
198416
208317
218317
228218
238218
248218
258218
268119
278119
288119
298119
308020

Chance of precipitation in September

Any precipitation

Muaná gets around 17 mm of rain over 4.7 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 16% and peaks near 23% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%151015202530
Rain chance (%)
123
223
323
422
522
621
721
820
919
1019
1118
1218
1317
1416
1516
1615
1714
1814
1913
2012
2112
2212
2311
2411
2511
2611
2711
2811
2911
3011

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 70% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Oppressive (%)Miserable (%)
15941
26040
36139
46238
56337
66436
76436
86535
96535
106634
116634
126733
136733
146832
156931
166931
177030
187129
197228
207327
217426
227525
237624
247723
257822
267822
277822
287921
297921
307921

Wind in September

Winds average 11 km/h in September.

Across September, daily wind ranges from about 11 km/h on the calmest days to 12 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
111calm
211calm
311calm
411calm
511calm
611calm
711calm
811calm
911calm
1011calm
1111calm
1211calm
1311calm
1411calm
1511calm
1611calm
1711calm
1811calm
1911calm
2011calm
2111calm
2211calm
2311calm
2411calm
2512calm
2612calm
2712calm
2812calm
2912calm
3012calm

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 6:17 AM to 6:06 AM, and sunset from 6:16 PM to 6:07 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.06:176:16
212.06:176:15
312.06:176:15
412.06:166:15
512.06:166:14
612.06:166:14
712.06:156:14
812.06:156:14
912.06:146:13
1012.06:146:13
1112.06:146:13
1212.06:136:12
1312.06:136:12
1412.06:126:12
1512.06:126:11
1612.06:116:11
1712.06:116:11
1812.06:116:10
1912.06:106:10
2012.06:106:10
2112.06:096:09
2212.06:096:09
2312.06:096:09
2412.06:086:08
2512.06:086:08
2612.06:076:08
2712.06:076:07
2812.06:076:07
2912.06:066:07
3012.06:066:07

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.46 kWh/m².

For context, solar energy here swings from a low near 4.45 kWh/m² to a high of 6.56 kWh/m² in October across the year — September's 6.46 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
76.4Intense
86.4Intense
96.4Intense
106.4Intense
116.4Intense
126.4Intense
136.4Intense
146.4Intense
156.5Intense
166.5Intense
176.5Intense
186.5Intense
196.5Intense
206.5Intense
216.5Intense
226.5Intense
236.5Intense
246.5Intense
256.5Intense
266.6Intense
276.6Intense
286.6Intense
296.6Intense
306.6Intense
Planning a trip in September

Hazard calendar for Muaná

In seasonPeak

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

Muaná'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 Muaná?

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

4.5
Sightseeing
1st-best month of the year
7.4
Beach & pool
1st-best month of the year

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

What to pack for Muaná in September

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

In September, Muaná sees daytime highs around 32°C and nights near 25°C. Pack light clothes and sun protection. About 5 days see rain.

light clothessun protection

Sea temperature near Muaná in September

The nearest coast averages about 29°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 68 km away) is warmest in June at about 29°C and coldest in March 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
Jan29Tropical
Feb28Tropical
Mar28Tropical
Apr29Tropical
May29Tropical
Jun29Tropical
Jul29Tropical
Aug29Tropical
Sep29Tropical
Oct29Tropical
Nov29Tropical
Dec29Tropical

UV index in Muaná 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 Muaná peaks around March 15 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 24 at about 10 (extreme).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeMar 15UV 15Jul 24UV 10
UV index (midday)Level
Jan13Extreme
Feb14Extreme
Mar15Extreme
Apr14Extreme
May12Extreme
Jun10Extreme
Jul10Extreme
Aug10Extreme
Sep12Extreme
Oct12Extreme
Nov10Extreme
Dec10Extreme

Air quality in Muaná 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 Muaná is worst in February — around 19 µg/m³ PM2.5 (moderate), about 2.1× the cleanest month (June, 9 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateFeb 2019 µg/m³Jun 239 µg/m³
PM2.5 (µg/m³)Level
Jan17Moderate
Feb19Moderate
Mar19Moderate
Apr16Moderate
May11Good
Jun9Good
Jul9Good
Aug11Good
Sep13Moderate
Oct16Moderate
Nov16Moderate
Dec15Moderate
Location & terrain

Where is Muaná?

Muaná sits at 1.5°S, 49.2°W, 7 m above sea level, in Brazil. The nearest listed city is São Sebastião da Boa Vista, 41 km away.

Topography around Muaná

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

Within 3 km, the terrain around Muaná has only modest variations in elevation — a maximum elevation change of 32 m around an average of 13 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 32 m; within 80 km, only modest variations in elevation — a maximum elevation change of 52 m.

The land around Muaná is covered by trees (88%) within 3 km, trees (66%) and water (23%) within 16 km, and trees (62%) within 80 km.

3 km
32 m
16 km
32 m
80 km
52 m
treesgrasslandartificial surfaceswaterwetland
September weather nearby: São Sebastião da Boa Vista 41 km · Ponta de Pedras 41 km · Abaetetuba 43 km · Limoeiro do Ajuru 45 km · Igarapé Miri 57 km · Moju 64 km · Cachoeira do Arari 64 km · Barcarena 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 Muaná (-1.5283°, -49.2167°, elevation 7 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).