Quissamã weather in September

In September, Quissamã sees average daytime highs of 28°C and overnight lows near 19°C, with 49 mm of rain across 7.7 wet days and about 11.9 hours of daylight. It is the 8th-warmest and 8th-wettest month of the year here.

Day-to-day highs hold fairly steady near 28°C through the month. The sky is clear or mostly clear about 37% of the time in September, and the air most often feels muggy.

Daylight stretches from about 11 h 36 min at the start of September to 12 h 12 min by month's end. Set against the rest of the year, September is Quissamã's 6th-clearest and 1st-windiest month. For the whole year in context, see Quissamã's year-round climate.

Daytime high
28°
8th warmest
Overnight low
19°
5th coldest
Rainfall
49 mm
7.7 wet days
Daylight
11 h 54 min
6:44 AM – 6:36 PM
Cloud cover
56%
6th clearest
Wind
12 km/h
1st windiest
Solar energy
4.78 kWh/m²
Travel score
6.7
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 28°C through the month.

A typical September day in Quissamã reaches about 28°C in the afternoon and slips back to 19°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 23°C and 33°C. Set against its neighbours, September runs on par with August and on par with October.

15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12819
22819
32819
42819
52819
62819
72819
82819
92819
102819
112819
122819
132819
142819
152819
162819
172819
182820
192820
202820
212820
222820
232820
242820
252820
262820
272820
282820
292820
302820

How September really feels in Quissamã

Once humidity and wind are folded in, September averages 0 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
0
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

September sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Quissamã weather by month

How September compares with the rest of the year at a glance. September is the 8th-warmest and 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan32° / 23°17015.213.23.6
Feb32° / 24°8811.312.83.6
Mar31° / 23°14516.612.23.7
Apr30° / 22°7912.211.54.9
May28° / 19°478.6116.6
Jun27° / 18°214.610.77.5
Jul27° / 18°245.110.87.6
Aug27° / 18°214.611.27.4
Sep28° / 19°497.711.96.7
Oct29° / 21°8410.512.55.4
Nov29° / 22°17616.913.14.4
Dec30° / 23°20918.413.33.7

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 37% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 12% of September, with mostly cloudy or overcast conditions the remaining 51%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
16139
26139
36139
46040
56040
66040
75842
85743
95644
105446
115347
125149
135050
145050
154852
164753
174753
184654
194555
204456
214357
224258
234159
244159
254159
264060
274060
283961
293862
303862

Chance of precipitation in September

Any precipitation

Quissamã gets around 49 mm of rain over 7.7 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 25% and peaks near 32% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%151015202530
Rain chance (%)
116
216
317
417
518
618
719
820
921
1022
1122
1223
1324
1425
1525
1626
1727
1828
1928
2029
2130
2230
2331
2431
2532
2632
2732
2832
2932
3032

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 48% of days. Sticky, muggy-or-worse air turns up on roughly 52% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
121538441
221538441
321538441
421438441
521438451
621438451
721438451
821438461
921338461
1021337471
1121337471
1211237481
1311236492
1411136492
1511135512
1611135512
1711134513
1821134503
1921033514
2021033514
2121032515
2221032506
2321032506
2421031497
253931498
263931489
2739314810
2839304811
2939304711
3038304712

Wind in September

Winds average 12 km/h in September, the windiest month of the year.

Across September, daily wind ranges from about 12 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
112calm
212calm
312light breeze
412light breeze
512light breeze
612light breeze
712light breeze
812light breeze
912light breeze
1012light breeze
1112light breeze
1212light breeze
1312light breeze
1412light breeze
1512light breeze
1612light breeze
1712light breeze
1812light breeze
1912light breeze
2012light breeze
2112light breeze
2212light breeze
2312light breeze
2412light breeze
2512light breeze
2612light breeze
2712light breeze
2812light breeze
2912calm
3012calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 36 min at the start of September to 12 h 12 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 36 minutes over September. Sunrise moves from 6:59 AM to 6:30 AM, and sunset from 6:32 PM to 6:41 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.66:596:32
211.66:586:32
311.66:576:33
411.66:566:33
511.66:556:33
611.76:546:34
711.76:536:34
811.76:526:34
911.76:516:34
1011.76:506:35
1111.86:496:35
1211.86:486:35
1311.86:476:36
1411.86:466:36
1511.96:456:36
1611.96:446:36
1711.96:436:37
1811.96:426:37
1911.96:416:37
2012.06:406:38
2112.06:396:38
2212.06:386:38
2312.06:376:38
2412.06:366:39
2512.16:356:39
2612.16:346:39
2712.16:336:40
2812.16:326:40
2912.26:316:40
3012.26:306:41

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.78 kWh/m².

For context, solar energy here swings from a low near 3.51 kWh/m² to a high of 6.33 kWh/m² in February across the year — September's 4.78 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.7Bright
24.7Bright
34.7Bright
44.7Bright
54.7Bright
64.8Bright
74.8Bright
84.8Bright
94.8Bright
104.8Bright
114.8Bright
124.8Bright
134.8Bright
144.8Bright
154.8Bright
164.8Bright
174.8Bright
184.8Bright
194.8Bright
204.8Bright
214.8Bright
224.8Bright
234.8Bright
244.8Bright
254.8Bright
264.8Bright
274.8Bright
284.8Bright
294.9Bright
304.9Bright
Planning a trip in September

Hazard calendar for Quissamã

In seasonPeak

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

Quissamã's rainy season runs November–January, 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 Quissamã?

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

6.7
Sightseeing
4th-best month of the year
7.2
Beach & pool
4th-best month of the year

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

What to pack for Quissamã in September

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

In September, Quissamã sees daytime highs around 28°C and nights near 19°C. Pack light clothes. Worth having: sun protection. About 8 days see rain.

light clothessun protection

Sea temperature near Quissamã in September

The nearest coast averages about 22°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea offshore is warmest in March at about 25°C and coldest in August near 22°C.

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

20°22°24°26°JanFebMarAprMayJunJulAugSepOctNovDecrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan24Warm
Feb25Warm
Mar25Warm
Apr25Warm
May24Refreshing
Jun23Refreshing
Jul22Refreshing
Aug22Refreshing
Sep22Refreshing
Oct22Refreshing
Nov23Refreshing
Dec24Warm

UV index in Quissamã in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 8 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Quissamã peaks around February 8 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 23 at about 6 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highHighVery highExtremeFeb 8UV 14Jun 23UV 6
UV index (midday)Level
Jan14Extreme
Feb14Extreme
Mar12Extreme
Apr9Very high
May7High
Jun6High
Jul6High
Aug8Very high
Sep8Very high
Oct12Extreme
Nov13Extreme
Dec14Extreme
Location & terrain

Where is Quissamã?

Quissamã sits at 22.1°S, 41.5°W, 9 m above sea level, in Brazil. The nearest listed city is Conceição de Macabu, 41 km away.

Topography around Quissamã

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

Within 3 km, the terrain around Quissamã has only modest variations in elevation — a maximum elevation change of 15 m around an average of 5 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 99 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,716 m.

The land around Quissamã is covered by grassland (46%) and wetland (26%) within 3 km, grassland (47%) and water (23%) within 16 km, and grassland (41%) and water (36%) within 80 km.

3 km
15 m
16 km
99 m
80 km
1,716 m
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
September weather nearby: Conceição de Macabu 41 km · Campos dos Goytacazes 42 km · Macaé 45 km · São Fidélis 59 km · Rio das Ostras 67 km · São João da Barra 68 km · Cambuci 74 km · Itaocara 79 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 Quissamã (-22.1067°, -41.4722°, elevation 9 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. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).