Rio de Janeiro
September
Weather in Rio de Janeiro for September 2026
Your guide to Rio de Janeiro weather in September - trends and predictions
Until now, September 2026 in Rio de Janeiro is cooler than usual, with temperatures averaging 21.9 °C, this is 3.7 °C below the typical seasonal average.
Expect cooler weather in the next days in Rio de Janeiro with the forecast suggesting a temperature of 23.6 °C, lower than the historical average.
In general, the average temperature in Rio de Janeiro at the beginning of September is 25.1 °C. As the month progressed, temperatures tended to moderately rise, reaching an average of 26.4 °C by the end of September.
With an average of 5 rainy days, Rio de Janeiro experiences minimal rainfall in September.
Temperatures
Rain 🌧️
25
Dry days
5
Rainy days
0
Snow days
27°/20°
Temperatures
18 km/h
Avg max wind
70 %
Avg humidity
Rio de Janeiro Weather September
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Temperatures trend during September in Rio de Janeiro
See the weather trend as well as the moving average line
September weather in Rio de Janeiro day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Partly cloudy | 26° /18° | 4.2 mm | 6 | |
| 2 Sept. |  Patchy rain possible | 25° /19° | 2.8 mm | 6 | |
| 3 Sept. |  Sunny | 26° /18° | 0 mm | 7 | |
| 4 Sept. | Sunny | 28° /19° | 0 mm | 8 | |
| 5 Sept. |  Light drizzle | 27° /19° | 1.5 mm | 7 | |
| 6 Sept. | Light rain shower | 22° /18° | 7.8 mm | 5 | |
| 7 Sept. | Light rain shower | 22° /18° | 5.4 mm | 5 | |
| 8 Sept. | Sunny | 26° /18° | 0.7 mm | 6 | |
| 9 Sept. | Sunny | 28° /19° | 3.4 mm | 7 | |
| 10 Sept. | Sunny | 26° /19° | 9.9 mm | 6 | |
| 11 Sept. | Sunny | 27° /21° | 1 mm | 10.2 | |
| 12 Sept. | Light rain shower | 26° /19° | 3.5 mm | 10 | |
| 13 Sept. | Light rain shower | 20° /19° | 15.8 mm | 1.3 | |
| 14 Sept. | Patchy rain possible | 22° /18° | 50.6 mm | 5.3 | |
| 15 Sept. | Light rain shower | 22° /19° | 18.4 mm | 7 | |
| 16 Sept. | Light rain shower | 21° /20° | 6.5 mm | 6 | |
| 17 Sept. | Light rain shower | 19° /17° | 4.7 mm | 5 | |
| 18 Sept. |  Overcast | 22° /18° | 1.4 mm | 6 | |
| 19 Sept. | Light rain shower | 20° /19° | 19.4 mm | 5 | |
| 20 Sept. | Overcast | 30° /20° | 4.7 mm | 7 | |
| 21 Sept. | Overcast | 25° /21° | 0 mm | 6 | |
| 22 Sept. | Light rain shower | 24° /19° | 16.4 mm | 6 | |
| 23 Sept. | Sunny | 24° /19° | 1.4 mm | 7 | |
| 24 Sept. | Overcast | 28° /21° | 10 mm | 8 | |
| 25 Sept. | Partly cloudy | 26° /20° | 4.3 mm | 7 | |
| 26 Sept. | Partly cloudy | 27° /20° | 2.1 mm | 7 | |
| 27 Sept. | Partly cloudy | 29° /20° | 0.3 mm | 8 | |
| 28 Sept. | Light rain shower | 23° /18° | 2.6 mm | 6 | |
| 29 Sept. | Patchy rain possible | 25° /19° | 0.2 mm | 7 | |
| 30 Sept. | Sunny | 27° /18° | 0 mm | 7 | |
| Next | |||||
Important Notice
Our weather forecast for Rio de Janeiro in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Rio de Janeiro forecast closer to your planned date for the most up-to-date weather information.
Change Month
Rio de Janeiro in September - FAQ
What are the expected maximum and minimum temperatures in Rio de Janeiro during September?
During September, expect a variety of temperatures with highs around 27° and lows near 20°, suitable for diverse activities and preferences.
How much rainfall should be expected in Rio de Janeiro during September?
In September, Rio de Janeiro can expect light to moderate rainfall, totaling 28.8 mm across approximately 5 days. Occasional showers are possible, and planning ahead for them could be helpful.
What are the typical wind conditions in Rio de Janeiro during September?
The average wind speed in Rio de Janeiro during September is 18 km/h, suggesting breezy to windy conditions, depending on your activities.
Rio de Janeiro water temperatures in September
The average water temperature of the Atlantic Ocean near Rio de Janeiro in September is 20.3 °C. Temperatures remain fairly consistent throughout the month.
- What is the water temperature in Rio de Janeiro in September?
- The average water temperature in Rio de Janeiro in September is 20.3 °C.
- Can you swim in Rio de Janeiro in September?
- Refreshing and invigorating. Expect to feel chilled after 10–20 minutes; a shorty wetsuit extends water time, especially at dawn.
September rainfall patterns in Rio de Janeiro
Explore the daily rainfall trends and prepare for Rio de Janeiros September weather 💧
Typically, Rio de Janeiro has 5 rainy days in September with a total of 28.8 mm of rainfall.
UV exposure in Rio de Janeiro during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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