Rio de Janeiro weather in August
Rio de Janeiro averages 25°C by day and 18°C at night in August, with the sea at 22°C and about 63 mm of rain in the month.
Day
25°C
Night
18°C
Sea
22°C
Rain
63 mm
Flight from London
11½h
What August feels like
August is hot in Rio de Janeiro: proper beach weather.
The sea is 22°C: fine for swimming without a wetsuit.
Rain is occasional: about 63 mm in the month.
That is 2°C warmer than an average August day in London.
Of the 56 sun destinations we track, Rio de Janeiro is the #54 warmest in August.
Want it warmer in August?
These are hotter than Rio de Janeiro this month for at most an hour and a half more flying:
Rio de Janeiro weather by month
August is highlighted. Compare with July and September, or see the full year in Rio de Janeiro.
| Month | Day | Night | Sea | Rain |
|---|---|---|---|---|
| January | 30°C | 24°C | 26°C | 154 mm |
| February | 30°C | 24°C | 28°C | 126 mm |
| March | 29°C | 24°C | 26°C | 133 mm |
| April | 27°C | 22°C | 25°C | 86 mm |
| May | 26°C | 20°C | 24°C | 59 mm |
| June | 25°C | 19°C | 23°C | 38 mm |
| July | 25°C | 18°C | 22°C | 40 mm |
| August | 25°C | 18°C | 22°C | 63 mm |
| September | 26°C | 20°C | 23°C | 59 mm |
| October | 27°C | 21°C | 22°C | 89 mm |
| November | 27°C | 21°C | 23°C | 130 mm |
| December | 29°C | 23°C | 25°C | 132 mm |
Rio de Janeiro in August: quick answers
Is Rio de Janeiro hot in August?
August is hot in Rio de Janeiro: proper beach weather. Average highs are 25°C and lows 18°C.
Can you swim in Rio de Janeiro in August?
The sea is 22°C: fine for swimming without a wetsuit.
Does it rain in Rio de Janeiro in August?
Rain is occasional: about 63 mm in the month.
What is the warmest month in Rio de Janeiro?
February, at an average high of 30°C. The coolest is July at 25°C.
How long is the flight to Rio de Janeiro from the UK?
About 11½h direct from London, estimated from the 9,260 km distance. Check your airline for exact times.
Still choosing? See where is hot in August for every destination ranked by temperature, sea and flight time.
How we measured this
Averages of every day in August from 2016 to 2025, from the Open-Meteo historical weather archive (ECMWF ERA5 reanalysis). Sea temperature is the 2023 to 2025 average from the Open-Meteo marine archive. Rain is the average monthly total. Reanalysis describes an area about 25 km across, so sheltered resorts can run a degree or two warmer. Flight time is a distance-based estimate from London Heathrow.
Planning Rio de Janeiro in August?
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