Rio de Janeiro weather in September
September is one of the best months to visit Rio de Janeiro: highs of 25°C (78°F) and about 69 mm (2.7 in) of rain on average. Nights average 19°C (65°F) and cloud cover 57% (NASA POWER, 2001–2025 averages). The sea averages 22°C (72°F). It is the 4th driest month of the year and the 5th coolest. Compared with August, it is warmer and wetter; October brings highs of 26°C (79°F) and 108 mm (4.3 in) of rain.
Is September a good time to visit Rio de Janeiro?
best month Weather score 77/100.
Yes. September is one of the best months for weather in Rio de Janeiro.
Does it rain a lot in Rio de Janeiro in September?
Some rain is normal: about 69 mm (2.7 in) falls in an average September. It is the 4th driest month of the year.
How warm is Rio de Janeiro in September?
Days average 25°C (78°F) and nights 19°C (65°F).
Rio de Janeiro weather by month
| Month | High | Low | Rain | Cloud | Sea | Weather |
|---|---|---|---|---|---|---|
| January | 28°C (83°F) | 23°C (74°F) | 208 mm | 71% | 26°C (79°F) | least pleasant |
| February | 28°C (83°F) | 23°C (74°F) | 152 mm | 62% | 28°C (82°F) | fair |
| March | 28°C (82°F) | 23°C (74°F) | 173 mm | 66% | 26°C (78°F) | fair |
| April | 27°C (80°F) | 22°C (72°F) | 101 mm | 56% | 25°C (77°F) | fair |
| May | 25°C (77°F) | 20°C (68°F) | 71 mm | 56% | 24°C (76°F) | best |
| June | 24°C (76°F) | 19°C (66°F) | 49 mm | 49% | 23°C (73°F) | best |
| July | 24°C (75°F) | 18°C (64°F) | 45 mm | 45% | 22°C (72°F) | best |
| August | 25°C (76°F) | 18°C (64°F) | 42 mm | 45% | 22°C (72°F) | best |
| September | 25°C (78°F) | 19°C (65°F) | 69 mm | 57% | 22°C (72°F) | best |
| October | 26°C (79°F) | 20°C (68°F) | 108 mm | 70% | 21°C (70°F) | fair |
| November | 26°C (79°F) | 21°C (69°F) | 220 mm | 79% | 22°C (71°F) | least pleasant |
| December | 27°C (81°F) | 22°C (72°F) | 232 mm | 75% | 25°C (76°F) | least pleasant |
Sources: 2001–2025 monthly averages from NASA POWER (MERRA-2 reanalysis), sea temperature from Open-Meteo Marine. Page updated . How we rate months