Iguaba Grande weather in September

In September, Iguaba Grande sees average daytime highs of 25°C and overnight lows near 20°C, with 74 mm of rain across 10 wet days and about 11.9 hours of daylight. It is the 9th-warmest and 8th-wettest month of the year here.

Day-to-day highs hold fairly steady near 25°C through the month. The sky is clear or mostly clear about 41% of the time in September, and the air most often feels muggy.

Daylight stretches from about 11 h 30 min at the start of September to 12 h 12 min by month's end. Set against the rest of the year, September is Iguaba Grande's 6th-clearest and 1st-windiest month. For the whole year in context, see Iguaba Grande's year-round climate.

Daytime high
25°
9th warmest
Overnight low
20°
4th coldest
Rainfall
74 mm
10 wet days
Daylight
11 h 54 min
6:47 AM – 6:39 PM
Cloud cover
52%
6th clearest
Wind
15 km/h
1st windiest
Solar energy
4.95 kWh/m²
Travel score
7.0
out of 10

Iguaba Grande is 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 25°C through the month.

A typical September day in Iguaba Grande reaches about 25°C in the afternoon and slips back to 20°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between 21°C and 28°C. Set against its neighbours, September runs on par with August and on par with October.

15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12519
22519
32519
42519
52519
62519
72519
82519
92519
102520
112520
122520
132520
142520
152520
162520
172520
182520
192520
202520
212520
222520
232520
242520
252520
262520
272520
282520
292520
302520

How September really feels in Iguaba Grande

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.

Iguaba Grande weather by month

How September compares with the rest of the year at a glance. September is the 9th-warmest and 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan29° / 24°17815.413.25.0
Feb29° / 24°12211.712.85.2
Mar28° / 23°16316.112.25.2
Apr27° / 22°8511.511.56.4
May25° / 20°7410.910.96.9
Jun25° / 19°436.910.67.7
Jul24° / 18°457.810.77.7
Aug24° / 19°427.211.27.7
Sep25° / 20°741011.97.0
Oct26° / 21°9411.112.56.5
Nov26° / 22°17215.913.15.6
Dec28° / 23°18916.913.45.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 41% 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 48%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
16634
26634
36634
46634
56436
66436
76238
86139
96040
105842
115743
125545
135545
145347
155248
165050
174951
184852
194753
204654
214456
224456
234555
244456
254357
264357
274258
284258
294258
304159

Chance of precipitation in September

Any precipitation

Iguaba Grande gets around 74 mm of rain over 10 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 32% and peaks near 40% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
124
225
325
425
526
626
727
827
928
1028
1129
1230
1330
1431
1531
1632
1733
1834
1935
2036
2137
2238
2338
2439
2539
2639
2739
2840
2940
3039

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 53% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
121339451
221338451
321338461
421338461
521338461
621338461
721338461
821238471
921238471
1011238472
1111237482
1211237482
1311137492
1411136493
1511135503
1611135503
1711134504
1811133514
1911133505
2021132506
2121132506
2221031497
2321031498
2421030489
25310304810
26310294711
2739294712
2839294613
2939294613
3039284614

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 16 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
916light breeze
1016light breeze
1116light breeze
1216light breeze
1316light breeze
1416light breeze
1516light breeze
1616light breeze
1716light breeze
1816light breeze
1916light 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 11 h 30 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 42 minutes over September. Sunrise moves from 7:03 AM to 6:33 AM, and sunset from 6:35 PM to 6:44 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.57:036:35
211.67:026:35
311.67:016:35
411.67:006:36
511.66:596:36
611.66:586:36
711.76:576:37
811.76:556:37
911.76:546:37
1011.76:536:38
1111.86:526:38
1211.86:516:38
1311.86:506:38
1411.86:496:39
1511.86:486:39
1611.96:476:39
1711.96:466:40
1811.96:456:40
1911.96:446:40
2012.06:436:41
2112.06:426:41
2212.06:416:41
2312.06:406:42
2412.16:396:42
2512.16:386:42
2612.16:376:42
2712.16:366:43
2812.16:356:43
2912.26:346:43
3012.26:336:44

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.95 kWh/m².

For context, solar energy here swings from a low near 3.53 kWh/m² to a high of 6.32 kWh/m² in February across the year — September's 4.95 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
14.8Bright
24.8Bright
34.9Bright
44.9Bright
54.9Bright
64.9Bright
74.9Bright
84.9Bright
94.9Bright
104.9Bright
115.0Bright
125.0Bright
135.0Bright
145.0Bright
155.0Bright
165.0Bright
175.0Bright
185.0Bright
195.0Bright
205.0Bright
215.0Bright
225.0Bright
235.0Bright
245.0Bright
255.0Bright
265.0Bright
275.1Bright
285.1Bright
295.1Bright
305.1Bright
Planning a trip in September

Hazard calendar for Iguaba Grande

In seasonPeak

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

Iguaba Grande's rainy season runs October–March, 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 Iguaba Grande?

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

7.0
Sightseeing
4th-best month of the year
6.3
Beach & pool
7th-best month of the year

September is one of the better times to visit Iguaba Grande for general sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Iguaba Grande in September

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

In September, Iguaba Grande sees daytime highs around 25°C and nights near 20°C. Worth packing: light clothes, rain gear and sun protection. About 10 days see rain.

light clothesrain gearsun protection

Sea temperature near Iguaba Grande 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 at the nearest coast (about 34 km away) is warmest in March at about 26°C and coldest in September near 22°C.

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

20°22°24°26°28°JanFebMarAprMayJunJulAugSepOctNovDecrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan25Warm
Feb25Warm
Mar26Warm
Apr25Warm
May24Refreshing
Jun23Refreshing
Jul22Refreshing
Aug22Refreshing
Sep22Refreshing
Oct22Refreshing
Nov23Refreshing
Dec24Warm

UV index in Iguaba Grande in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Iguaba Grande peaks around January 14 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 12 at about 5 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highHighVery highExtremeJan 14UV 14Jul 12UV 5
UV index (midday)Level
Jan14Extreme
Feb13Extreme
Mar12Extreme
Apr9Very high
May7High
Jun6High
Jul5Moderate
Aug8Very high
Sep7High
Oct12Extreme
Nov13Extreme
Dec14Extreme
Location & terrain

Where is Iguaba Grande?

Iguaba Grande sits at 22.8°S, 42.2°W, 17 m above sea level, in Brazil. The nearest listed city is Araruama, 12 km away.

Topography around Iguaba Grande

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

Within 3 km, the terrain around Iguaba Grande has only modest variations in elevation — a maximum elevation change of 113 m around an average of 16 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 297 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,252 m.

The land around Iguaba Grande is covered by grassland (32%), water (26%) and artificial surfaces (25%) within 3 km, grassland (38%) and water (35%) within 16 km, and water (45%), trees (30%) and grassland (21%) within 80 km.

3 km
113 m
16 km
297 m
80 km
2,252 m
treesgrasslandartificial surfaceswaterwetland
September weather nearby: Araruama 12 km · São Pedro da Aldeia 13 km · Cabo Frio 21 km · Arraial do Cabo 25 km · Saquarema 26 km · Silva Jardim 27 km · Buzios 37 km · Casimiro de Abreu 40 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 Iguaba Grande (-22.8392°, -42.2289°, elevation 17 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).