Rio de Janeiro weather in August
Temperature, sea and sunshine in August: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in August
Good
Best time to visit: January – December
What is the weather like in Rio de Janeiro in August?
In August, Rio de Janeiro is warm: daytime highs average 26 °C, and nights cool down to about 17 °C. The sea averages 21.4 °C – refreshing for a swim. Expect around 6 hours of sunshine a day. Rain falls on about 7 days, adding up to 38 mm. On about 6 days the thermometer climbs to 30 °C or more. All in all, August is a good month for a holiday in Rio de Janeiro.
August compared
How the weather changes from July to September. Tap a month to open it.
| JulyJul | AugustAug | SeptemberSep | |
|---|---|---|---|
| Score | 78 | 78 | 73 |
| Day | 25° | 26° | 28° |
| Night | 16° | 17° | 18° |
| Sea | 22° | 21° | 21° |
| Sun | 6 h | 6 h | 6 h |
| Rain days | 7 | 7 | 9 |
More details for August
- Daylight
- 11 h 18 min06:19 – 17:37
- UV index
- 7 · highclear sky, noon (estimate)All months
- Muggy days
- 5 daysdew point 18 °C or more
- Wind
- 17 km/haverage daily peak
- Cloud cover
- 43 %on average
- Hot days
- 6 days30 °C or more
- Time zone
- UTC−3America/Sao_Paulo
How the score comes together
- Temperatureweight 35 %100 %
- Seaweight 25 %63 %
- Sunshineweight 20 %57 %
- Few rainy daysweight 20 %78 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in August
- Swimwear
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
Rio de Janeiro in August: quick answers
Is Rio de Janeiro hot in August?
Warm rather than hot: in August, daytime highs in Rio de Janeiro average 26 °C and nights cool to about 17 °C. On about 6 days the thermometer climbs to 30 °C or more.
Can you swim in Rio de Janeiro in August?
Yes. In August the sea averages 21.4 °C – refreshing for a swim.
Does it rain much in Rio de Janeiro in August?
Rain falls on about 7 days, adding up to 38 mm.
Rio de Janeiro month by month
The whole year in Rio de JaneiroAll destinations: BrazilWhere to go in AugustSea temperature in August
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0)