Monthly climate guide
Rio de Janeiro weather in September
Expect warm weather in Rio de Janeiro in September: afternoons reach about 26°C (79°F), while nights drop to around 19°C (67°F). Around 73 mm of rain falls over the month (some rain), and skies are a mix of sun and cloud. Daytime highs are about the same as August and about the same as October.
What stands out in September
- It's humid — around 77% — so the heat feels heavier.
- September sits in Rio de Janeiro's drier season — usually a comfortable time to visit.
- Rio de Janeiro is usually about 4°C cooler than Petrópolis, 40 km away, in September.
- Good walking weather for combining Sugarloaf Mountain and Christ the Redeemer in one day.
Avg high
26°C
79°F
Avg low
19°C
67°F
Rainfall
73 mm
some rain
Humidity
77%
relative
Sky
53%
cloud · a mix of sun and cloud
Rio de Janeiro weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 29°C / 84°F | 24°C / 75°F | 215 mm | 82% | 65% |
| February | 29°C / 84°F | 24°C / 75°F | 180 mm | 82% | 62% |
| March | 28°C / 82°F | 23°C / 74°F | 197 mm | 83% | 71% |
| April | 27°C / 80°F | 22°C / 72°F | 106 mm | 82% | 57% |
| May | 25°C / 77°F | 20°C / 68°F | 73 mm | 81% | 58% |
| June | 25°C / 76°F | 19°C / 67°F | 56 mm | 81% | 53% |
| July | 24°C / 76°F | 18°C / 65°F | 30 mm | 78% | 45% |
| August | 25°C / 77°F | 18°C / 65°F | 47 mm | 77% | 46% |
| September | 26°C / 79°F | 19°C / 67°F | 73 mm | 77% | 53% |
| October | 27°C / 80°F | 21°C / 69°F | 99 mm | 79% | 69% |
| November | 26°C / 79°F | 21°C / 70°F | 261 mm | 83% | 78% |
| December | 28°C / 82°F | 23°C / 73°F | 235 mm | 83% | 71% |
What to pack for September
- T-shirts plus a light layer for the evening
- Comfortable trainers or sandals for long walks
- A compact umbrella or packable rain jacket
- Water-resistant shoes
- Quick-dry fabrics — it feels stickier than the temperature suggests
Is September a good time to visit Rio de Janeiro?
Our Rio de Janeiro guide recommends: April to June or September to October, avoiding the peak heat and crowds of the December–February summer.
Stick to well-touristed areas and take standard city precautions with valuables — like any major city, it pays to be aware of your surroundings.
Best time to visit Rio de Janeiro →Other Brazil cities in September
Cite or embed this data
Writing about this destination? Copy a ready-made citation or embed a live widget — free, just keep the link.
Rio de Janeiro weather in September. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/brazil/rio-de-janeiro/september
<a href="https://weathercompare.eu/weather/brazil/rio-de-janeiro/september">Rio de Janeiro weather in September</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/brazil/rio-de-janeiro" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="Rio de Janeiro weather in September"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/brazil/rio-de-janeiro/september">Rio de Janeiro weather in September</a> – WeatherCompare</p>
Rio de Janeiro in September: quick answers
Is September a good time to visit Rio de Janeiro?
Yes. September is one of the best months for Rio de Janeiro, with highs around 26°C and about 73 mm of rain.
How warm is Rio de Janeiro in September?
Average highs are about 26°C (79°F) and average lows about 19°C (67°F), based on 10 years of daily data.
Does it rain a lot in Rio de Janeiro in September?
Rio de Janeiro typically gets around 73 mm of rain in September — some rain.
When is the best time to visit Rio de Janeiro?
April to June or September to October, avoiding the peak heat and crowds of the December–February summer.
Figures are long-term averages for the area around Rio de Janeiro (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.