Rio das Ostras Temperature by Month
Rio das Ostras, Rio de Janeiro State, Brazil has a consistently comfortable climate year-round, with daytime highs averaging 28°C (82°F). Below you'll find a full monthly breakdown and a comparison with cities worldwide.
Rio das Ostras Monthly Temperatures
The temperature in Rio das Ostras remains steady throughout the year, providing a consistently very warm climate. Maximum daytime temperatures range from a very warm 31°C (88°F) in February to a comfortable 26°C (79°F) in July. Nights are mild year-round, with lows ranging from 24°C (75°F) in February to 18°C (64°F) in July.
The chart below illustrates the average maximum day and minimum night temperatures in Rio das Ostras by month:
Low temperatures are most often recorded between 4 AM and 6 AM, while highs typically occur around 3 PM.
The chart below shows the average temperature throughout the year:
Temperature: Rio das Ostras vs Brazil
The map below shows the annual temperature across Brazil. You can also select individual months if you want to compare a specific time of year.
very warm
warm
pleasant
moderate
cold
very cold
Rio das Ostras vs World: Temperature Compared
Rio das Ostras's average annual maximum temperature is 28°C (82°F). To put that in context, here's how it compares to a few well-known destinations:
Athens, Greece sits at 23°C (73°F) on average, with hot dry summers and mild winters characteristic of the Mediterranean.
Reykjavík, Iceland averages 9°C (48°F) a year — mild summers by Icelandic standards, but cold winters and frequent wind.
San Francisco, USA averages 19°C (66°F) annually, but with little seasonal variation — summers are often cool and foggy, winters mild.
Adelaide, Australia averages 21°C (70°F) a year, with warm summers, mild winters, and relatively low rainfall year-round.
What Does the Temperature Feel Like in Rio das Ostras?
Temperature alone doesn't tell the whole story — humidity plays a big role in how warm or cold it actually feels. High humidity in summer makes the heat feel more intense, particularly once temperatures climb above 25°C. In winter, the same humidity can make cold air feel sharper than the thermometer suggests.
In Rio das Ostras, July is the coolest month, with average highs of 26°C (79°F) and humidity around 80% — considered very high. In February, the warmest month, temperatures average 31°C (88°F) with 82% humidity — conditions that feel very high. For a full picture, see our humidity page.
Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.
The readings come from a range of sources — land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.
For cities and regions with significant elevation, altitude is one of the biggest factors shaping local temperatures. As a rule of thumb, temperatures fall by around 6°C for every 1,000 metres gained — so a city at 2,000 metres will typically be around 12°C cooler than a city at sea level in the same region. Higher ground also tends to see more dramatic day-to-night temperature swings, since thinner air loses heat faster after sunset.
For more on Rio das Ostras's weather — including monthly rainfall, sunshine hours, and humidity — visit our Rio das Ostras climate page.
