Cachoeiras de Macacu weather in September

In September, Cachoeiras de Macacu sees average daytime highs of 25°C and overnight lows near 16°C, with 108 mm of rain across 12.3 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 25°C through the month. The sky is clear or mostly clear about 34% of the time in September, and the air most often feels humid.

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 Cachoeiras de Macacu's 5th-clearest and 1st-windiest month. For the whole year in context, see Cachoeiras de Macacu's year-round climate.

Daytime high
25°
8th warmest
Overnight low
16°
5th coldest
Rainfall
108 mm
12.3 wet days
Daylight
11 h 54 min
6:49 AM – 6:41 PM
Cloud cover
59%
5th clearest
Wind
6 km/h
1st windiest
Solar energy
4.68 kWh/m²
Travel score
6.6
out of 10

Cachoeiras de Macacu 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 25°C through the month.

A typical September day in Cachoeiras de Macacu reaches about 25°C in the afternoon and slips back to 16°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 19°C and 29°C. Set against its neighbours, September runs about 1°C warmer than August and about 1°C cooler than October.

10°15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12515
22515
32515
42515
52515
62516
72516
82516
92516
102516
112516
122516
132516
142516
152516
162516
172516
182516
192516
202516
212516
222516
232516
242516
252516
262517
272517
282517
292517
302517

Cachoeiras de Macacu 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
Jan28° / 21°36224.113.23.9
Feb29° / 20°2772012.84.0
Mar28° / 20°2872412.24.3
Apr26° / 18°13416.411.55.6
May24° / 16°871210.96.7
Jun24° / 15°497.710.77.5
Jul23° / 14°487.110.87.6
Aug24° / 14°517.711.27.5
Sep25° / 16°10812.311.96.6
Oct25° / 18°15916.512.55.6
Nov26° / 19°29721.613.14.7
Dec27° / 20°36724.713.44.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 34% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 11% of September, with mostly cloudy or overcast conditions the remaining 55%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
16139
26040
35941
45941
55842
65743
75644
85446
95347
105248
115149
125050
134852
144654
154456
164357
174258
184060
193961
203862
213763
223664
233565
243466
253367
263268
273268
283169
293169
303070

Chance of precipitation in September

Any precipitation

Cachoeiras de Macacu gets around 108 mm of rain over 12.3 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 40% and peaks near 50% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
130
231
332
432
533
634
734
835
936
1036
1137
1237
1338
1438
1539
1640
1741
1842
1942
2043
2144
2245
2346
2447
2547
2648
2749
2849
2950
3050

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the humid band about 45% of days. Sticky, muggy-or-worse air turns up on roughly 14% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
11343405
21242415
31242415
41141426
51140426
61140437
71039447
81038448
9938458
10937469
11836469
127364710
137354710
146354811
156344812
165344813
175344814
185334715
195334716
205324617
215324518
225314519
236304420
246294421
256294322
266284323
276274324
286264325
296254326
306244227

Wind in September

Winds average 6 km/h in September, the windiest month of the year.

Across September, daily wind ranges from about 6 km/h on the calmest days to 6 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm

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 7:04 AM to 6:34 AM, and sunset from 6:37 PM to 6:45 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.57:046:37
211.67:036:37
311.67:026:37
411.67:016:38
511.67:006:38
611.76:596:38
711.76:586:38
811.76:576:39
911.76:566:39
1011.76:556:39
1111.86:546:40
1211.86:536:40
1311.86:526:40
1411.86:516:41
1511.96:506:41
1611.96:496:41
1711.96:486:41
1811.96:476:42
1911.96:466:42
2012.06:456:42
2112.06:446:43
2212.06:436:43
2312.06:426:43
2412.16:406:43
2512.16:396:44
2612.16:386:44
2712.16:376:44
2812.16:366:45
2912.26:356:45
3012.26:346:45

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.68 kWh/m².

For context, solar energy here swings from a low near 3.44 kWh/m² to a high of 5.99 kWh/m² in February across the year — September's 4.68 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.7Bright
24.7Bright
34.7Bright
44.7Bright
54.7Bright
64.7Bright
74.7Bright
84.7Bright
94.7Bright
104.7Bright
114.7Bright
124.7Bright
134.7Bright
144.7Bright
154.7Bright
164.7Bright
174.7Bright
184.7Bright
194.7Bright
204.7Bright
214.7Bright
224.7Bright
234.7Bright
244.7Bright
254.7Bright
264.7Bright
274.7Bright
284.7Bright
294.7Bright
304.7Bright
Planning a trip in September

Hazard calendar for Cachoeiras de Macacu

In seasonPeak

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

Cachoeiras de Macacu's rainy season runs November–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 Cachoeiras de Macacu?

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

6.6
Sightseeing
5th-best month of the year
5.8
Beach & pool
4th-best month of the year

September is a reasonable time to visit Cachoeiras de Macacu for sightseeing.

What to pack for Cachoeiras de Macacu in September

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

In September, Cachoeiras de Macacu sees daytime highs around 25°C and nights near 16°C. Worth packing: light clothes, rain gear and sun protection. About 12 days see rain.

light clothesrain gearsun protection

UV index in Cachoeiras de Macacu 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 Cachoeiras de Macacu peaks around January 21 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 11 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 highExtremeJan 21UV 14Jul 11UV 6
UV index (midday)Level
Jan15Extreme
Feb14Extreme
Mar13Extreme
Apr10Very high
May7High
Jun6High
Jul6High
Aug8Very high
Sep7Very high
Oct12Extreme
Nov14Extreme
Dec14Extreme

Air quality in Cachoeiras de Macacu 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 Cachoeiras de Macacu is worst in September — around 19 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (March, 10 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodSep 1518 µg/m³Mar 1110 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb11Good
Mar10Good
Apr12Good
May15Moderate
Jun16Moderate
Jul15Moderate
Aug15Moderate
Sep19Moderate
Oct13Moderate
Nov11Good
Dec10Good
Location & terrain

Where is Cachoeiras de Macacu?

Cachoeiras de Macacu sits at 22.5°S, 42.7°W, 63 m above sea level, in Brazil. The nearest listed city is Nova Friburgo, 24 km away.

Topography around Cachoeiras de Macacu

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

Within 3 km, the terrain around Cachoeiras de Macacu has large variations in elevation — a maximum elevation change of 710 m around an average of 239 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 2,264 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,252 m.

The land around Cachoeiras de Macacu is covered by trees (80%) within 3 km, trees (86%) within 16 km, and trees (46%) and grassland (33%) within 80 km.

3 km
710 m
16 km
2,264 m
80 km
2,252 m
treesgrasslandartificial surfaceswaterwetland
September weather nearby: Nova Friburgo 24 km · Rio Bonito 28 km · Tanguá 30 km · São Pedro 32 km · Teresópolis 34 km · Silva Jardim 34 km · Guapimirim 35 km · Itaboraí 38 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 Cachoeiras de Macacu (-22.4625°, -42.6531°, elevation 63 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).