Rio das Ostras in Winter
In winter (June, July and August), Rio das Ostras sees average daytime highs around 26°C and overnight lows near 18°C, with 94 mm of rain over about 18 wet days across the season. It is the coldest season of the year and the driest season of the year.
Across winter, daytime highs hold fairly steady around 26°C. The sky is clear or mostly clear about 51% of the time across winter, and the air most often feels humid.
Winter is Rio das Ostras's best season of the year to visit on our travel score. For the whole year in context, see Rio das Ostras's year-round climate.
- Avg daytime high
- 26°C
- coldest season of the year
- Avg overnight low
- 18°C
- Rainfall
- 94 mm
- 18 wet days
- Avg wind
- 10 km/h
- Travel score
- 7.7
- best season of the year
- Months
- Jun · Jul · Aug
Temperature in Rio das Ostras in Winter
Across winter, daytime highs hold fairly steady around 26°C.
A typical winter day in Rio das Ostras reaches about 26°C and drops to 18°C overnight. The warmest of the three months is June, the coolest July.
How winter really feels in Rio das Ostras
Once humidity and wind are folded in, winter brings about 0 days that feel above 32°C and 0 that feel at or below 0°C.
winter sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Rio das Ostras weather by month
How the three winter months (June, July and August) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 30° / 23° | 206 | 16.6 | 13.2 | 4.1 |
| Feb | 31° / 24° | 136 | 12.7 | 12.8 | 4.2 |
| Mar | 30° / 23° | 172 | 17.8 | 12.2 | 4.3 |
| Apr | 28° / 21° | 85 | 12 | 11.5 | 5.7 |
| May | 26° / 19° | 60 | 9.5 | 10.9 | 6.9 |
| Jun | 26° / 18° | 31 | 5.9 | 10.6 | 7.6 |
| Jul | 25° / 18° | 29 | 5.6 | 10.8 | 7.8 |
| Aug | 26° / 18° | 34 | 6.3 | 11.2 | 7.6 |
| Sep | 26° / 19° | 73 | 10.1 | 11.9 | 6.7 |
| Oct | 27° / 20° | 108 | 12 | 12.5 | 6.1 |
| Nov | 27° / 21° | 203 | 17.5 | 13.1 | 5.1 |
| Dec | 29° / 23° | 222 | 19 | 13.4 | 4.2 |
Cloud cover in Winter
The sky is clear or mostly clear about 51% of the time across winter.
Chance of precipitation in Winter
Rio das Ostras gets around 94 mm of rain over 18 wet days across winter. The line is the day-by-day chance of measurable precipitation.
Humidity in Winter
Most of winter feels humid — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Winter
Winds average 10 km/h across winter.
Sunrise & sunset in Winter
Daylight runs from about 10 h 42 min in early June to 11 h 30 min by late August. The lit band spans sunrise to sunset each day.
Solar energy in Winter
Average shortwave solar energy reaching the ground each day across winter, about 3.9 kWh/m².
Hazard calendar for Rio das Ostras
None of Rio das Ostras's seasonal hazards peak in winter. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do.
Rio das Ostras's rainy season runs October–March, when most of the year's rain falls.
Is winter a good time to visit Rio das Ostras?
Our two travel scores rate winter for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
winter is one of the better times to visit Rio das Ostras for general sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Rio das Ostras in Winter
From winter's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In winter, Rio das Ostras sees daytime highs around 26°C and nights near 18°C. Worth packing: light clothes. About 18 days see rain.
Sea temperature near Rio das Ostras in Winter
The nearest coast averages about 22°C across winter — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 13 km away) is warmest in March at about 25°C and coldest in September near 21°C.
The water stays above 20°C all year — warm enough for a swim any month.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 24 | 24 | 25 | 25 | 24 | 23 | 22 | 22 | 21 | 22 | 22 | 24 |
| Comfort | Refreshing | Warm | Warm | Warm | Refreshing | Refreshing | Refreshing | Refreshing | Refreshing | Refreshing | Refreshing | Refreshing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 24 | Refreshing |
| Feb | 24 | Warm |
| Mar | 25 | Warm |
| Apr | 25 | Warm |
| May | 24 | Refreshing |
| Jun | 23 | Refreshing |
| Jul | 22 | Refreshing |
| Aug | 22 | Refreshing |
| Sep | 21 | Refreshing |
| Oct | 22 | Refreshing |
| Nov | 22 | Refreshing |
| Dec | 24 | Refreshing |
UV index in Rio das Ostras in Winter
Clear-sky midday UV across winter averages around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Rio das Ostras peaks around January 16 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.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 14 | 14 | 13 | 9 | 7 | 6 | 6 | 8 | 8 | 12 | 14 | 14 |
| Level | Extreme | Extreme | Extreme | Very high | High | High | High | Very high | Very high | Extreme | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 14 | Extreme |
| Feb | 14 | Extreme |
| Mar | 13 | Extreme |
| Apr | 9 | Very high |
| May | 7 | High |
| Jun | 6 | High |
| Jul | 6 | High |
| Aug | 8 | Very high |
| Sep | 8 | Very high |
| Oct | 12 | Extreme |
| Nov | 14 | Extreme |
| Dec | 14 | Extreme |
Where is Rio das Ostras?
Rio das Ostras sits at 22.5°S, 41.9°W, 11 m above sea level, in Brazil. The nearest listed city is Macaé, 23 km away.
Topography around Rio das Ostras
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Rio das Ostras.
Within 3 km, the terrain around Rio das Ostras has only modest variations in elevation — a maximum elevation change of 49 m around an average of 4 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 693 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,215 m.
The land around Rio das Ostras is covered by water (39%) and artificial surfaces (32%) within 3 km, water (45%) and grassland (27%) within 16 km, and water (37%), trees (31%) and grassland (28%) within 80 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
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 Rio das Ostras (-22.5269°, -41.945°, elevation 11 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.