Niterói weather in August

In August, Niterói sees average daytime highs of 25°C and overnight lows near 19°C, with 36 mm of rain across 7.2 wet days and about 11.2 hours of daylight. It is the 10th-warmest and 12th-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 52% of the time in August, and the air most often feels humid.

Daylight stretches from about 10 h 54 min at the start of August to 11 h 30 min by month's end. Set against the rest of the year, August is Niterói's 1st-clearest and 3rd-windiest month. For the whole year in context, see Niterói's year-round climate.

Daytime high
25°
10th warmest
Overnight low
19°
2nd coldest
Rainfall
36 mm
7.2 wet days
Daylight
11 h 12 min
7:20 AM – 6:33 PM
Cloud cover
42%
1st clearest
Wind
12 km/h
3rd windiest
Solar energy
4.24 kWh/m²
Travel score
7.6
out of 10
Air quality
Good
PM2.5 9 µg/m³ · 2015

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 25°C through the month.

A typical August day in Niterói reaches about 25°C in the afternoon and slips back to 19°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 21°C and 29°C. Set against its neighbours, August runs on par with July and on par with September.

15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12519
22519
32519
42519
52519
62519
72519
82519
92519
102519
112519
122519
132519
142519
152519
162519
172519
182519
192519
202519
212519
222519
232519
242519
252519
262519
272519
282519
292519
302519
312520

How August really feels in Niterói

Once humidity and wind are folded in, August 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

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

Niterói weather by month

How August compares with the rest of the year at a glance. August is the 10th-warmest and 12th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 24°14515.213.24.6
Feb30° / 25°9311.912.84.7
Mar29° / 24°12715.312.24.9
Apr28° / 23°7711.411.56.2
May26° / 21°7010.710.96.8
Jun25° / 20°416.710.67.6
Jul25° / 19°457.710.77.6
Aug25° / 19°367.211.27.6
Sep26° / 20°6610.211.96.9
Oct26° / 21°8010.612.56.4
Nov27° / 22°12214.813.15.7
Dec28° / 24°13315.113.45.1

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 52% of the time in August, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 14% of August, with mostly cloudy or overcast conditions the remaining 34%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16733
26634
36535
46535
56535
66535
76535
86634
96634
106535
116535
126634
136634
146634
156634
166733
176733
186733
196733
206733
216733
226634
236634
246634
256634
266733
276634
286634
296634
306634
316634

Chance of precipitation in August

Any precipitation

Niterói gets around 36 mm of rain over 7.2 wet days in August, the driest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 24% and peaks near 25% on the wettest days.

0%10%20%30%40%151015202531
Rain chance (%)
123
223
323
423
523
623
724
824
924
1024
1124
1224
1324
1424
1524
1624
1724
1824
1924
2024
2124
2224
2324
2424
2524
2624
2724
2824
2925
3025
3125

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, August lands in the humid band about 45% of days. Sticky, muggy-or-worse air turns up on roughly 39% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
121544390
221544390
321544390
421544390
531544390
631444380
731444380
831444381
931544381
1031544371
1131544371
1231545371
1331545371
1431545371
1531546361
1631546361
1731447361
1821447361
1921447360
2021448360
2121348370
2221348380
2321247390
2421247400
2521146400
2621146410
2721145420
2821144420
2921144431
3021144431
3121143431

Wind in August

Winds average 12 km/h in August.

Across August, daily wind ranges from about 11 km/h on the calmest days to 13 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
111calm
211calm
311calm
412calm
512calm
612calm
712calm
812calm
912light breeze
1012light breeze
1112light breeze
1212light breeze
1312light breeze
1412light breeze
1512light breeze
1613light breeze
1713light breeze
1813light breeze
1913light breeze
2013light breeze
2113light breeze
2213light breeze
2313light breeze
2413light breeze
2513light breeze
2613light breeze
2713light breeze
2813light breeze
2913light breeze
3013light breeze
3113light breeze

Sunrise & sunset in August

DaylightNight

Daylight runs from about 10 h 54 min at the start of August to 11 h 30 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 36 minutes over August. Sunrise moves from 7:30 AM to 7:07 AM, and sunset from 6:27 PM to 6:38 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
110.97:306:27
211.07:306:27
311.07:296:27
411.07:296:28
511.07:286:28
611.07:286:29
711.07:276:29
811.17:266:29
911.17:266:30
1011.17:256:30
1111.17:246:31
1211.17:236:31
1311.17:236:31
1411.27:226:32
1511.27:216:32
1611.27:206:33
1711.27:206:33
1811.27:196:33
1911.37:186:34
2011.37:176:34
2111.37:166:34
2211.37:156:35
2311.37:156:35
2411.47:146:36
2511.47:136:36
2611.47:126:36
2711.47:116:37
2811.47:106:37
2911.57:096:37
3011.57:086:38
3111.57:076:38

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 4.24 kWh/m².

For context, solar energy here swings from a low near 3.38 kWh/m² to a high of 6.15 kWh/m² in February across the year — August's 4.24 kWh/m² falls in the middle.

024151015202531
Solar energy (kWh/m²)Level
13.8Moderate
23.9Moderate
33.9Moderate
43.9Moderate
53.9Moderate
64.0Moderate
74.0Moderate
84.0Bright
94.0Bright
104.1Bright
114.1Bright
124.1Bright
134.1Bright
144.2Bright
154.2Bright
164.2Bright
174.3Bright
184.3Bright
194.3Bright
204.3Bright
214.4Bright
224.4Bright
234.4Bright
244.5Bright
254.5Bright
264.5Bright
274.5Bright
284.6Bright
294.6Bright
304.6Bright
314.6Bright
Planning a trip in August

Is August a good time to visit Niterói?

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

7.6
Sightseeing
1st-best month of the year
6.8
Beach & pool
2nd-best month of the year

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

What to pack for Niterói in August

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

In August, Niterói sees daytime highs around 25°C and nights near 19°C. Worth packing: light clothes. About 7 days see rain.

light clothes

Sea temperature near Niterói in August

The nearest coast averages about 21°C in August — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 27 km away) is warmest in March at about 25°C and coldest in August near 21°C.

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

20°22°24°26°JanFebMarAprMayJunJulAugSepOctNovDeccoolrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan25Warm
Feb25Warm
Mar25Warm
Apr25Warm
May24Refreshing
Jun23Refreshing
Jul22Refreshing
Aug21Refreshing
Sep21Refreshing
Oct22Refreshing
Nov23Refreshing
Dec24Warm

UV index in Niterói in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August 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 Niterói peaks around January 13 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 13 at about 5 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highHighExtremeJan 13UV 14Jul 13UV 5
UV index (midday)Level
Jan14Extreme
Feb13Extreme
Mar12Extreme
Apr9Very high
May6High
Jun6High
Jul5Moderate
Aug8Very high
Sep6High
Oct11Extreme
Nov13Extreme
Dec14Extreme
Location & terrain

Where is Niterói?

Niterói sits at 22.9°S, 43.1°W, 44 m above sea level, in Brazil. The nearest listed city is Rio de Janeiro, 8.0 km away.

Topography around Niterói

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

Within 3 km, the terrain around Niterói has only modest variations in elevation — a maximum elevation change of 207 m around an average of 36 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 769 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,252 m.

The land around Niterói is covered by artificial surfaces (55%) and trees (26%) within 3 km, water (45%), trees (25%) and artificial surfaces (25%) within 16 km, and trees (38%) and water (34%) within 80 km.

3 km
207 m
16 km
769 m
80 km
2,252 m
treesgrasslandartificial surfaceswaterwetlandmangroves
August weather nearby: Rio de Janeiro 8.0 km · Catete 9.0 km · Santa Teresa 9.0 km · Estácio 11 km · Copacabana 13 km · Ipanema 15 km · Leblon 17 km · Vidigal 19 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 Niterói (-22.8833°, -43.1036°, elevation 44 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).